Keithley 2280 Series User manual

Precision Measurement DC Power Supplies
Reference Manual
077085501 / February 2015
*P077085501*
077085501
A Tektr onix Company
Series 2280
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

Precision Measurement DC Power Supplies
Reference Manual
© 2015, Keithley Instruments
Cleveland, Ohio, U.S.A.
All rights reserved.
Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part,
without the prior written approval of Keithley Instruments is strictly prohibited.
All Keithley Instruments product names are trademarks or registered trademarks of Keithley
Instruments. Other brand names are trademarks or registered trademarks of their respective
holders.
Document number: 077085501 / February 2015
Series 2280

Safety precautions
The following safety precautions should be observed before using this product and any associated instrumentation. Although
some instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous
conditions may be present.
This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions
required to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using
the product. Refer to the user documentation for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the
equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the
instrument. They must be protected from electric shock and contact with hazardous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the line
voltage or replacing consumable materials. Maintenance procedures are described in the user documentation. The procedures
explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, perform safe installations, and repair products. Only properly trained
service personnel may perform installation and service procedures.
Keithley Instruments products are designed for use with electrical signals that are measurement, control, and data I/O
connections, with low transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high
transient overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient
overvoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected to
mains. These instruments will be marked as category II or higher.
Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test
fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than
30 V RMS, 42.4 V peak, or 60 VDC are present. A good safety practice is to expect that hazardous voltage is present in any
unknown circuit before measuring.
Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators
are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock . If
the circuit is capable of operating at or above 1000 V, no conductive part of the circuit may be exposed.
Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance-limited
sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective
devices to limit fault current and voltage to the card.
Before operating an instrument, ensure that the line cord is connected to a properly-grounded power receptacle. Inspect the
connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.
When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input
power disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under
test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting
cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.
Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth)
ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the
voltage being measured.
For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or

accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be
impaired.
Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating
information, and as shown on the instrument or test fixture panels, or switching card.
When fuses are used in a product, replace with the same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as protective earth (safety ground)
connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use
of a lid interlock.
If a screw is present, connect it to protective earth (safety ground) using the wire recommended in the user documentation.
The symbol on an instrument means caution, risk of danger. The user must refer to the operating instructions located in the
user documentation in all cases where the symbol is marked on the instrument.
The symbol on an instrument means caution, risk of electric shock. Use standard safety precautions to avoid personal
contact with these voltages.
The symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.
The symbol indicates a connection terminal to the equipment frame.
If this symbol is on a product, it indicates that mercury is present in the display lamp. Please note that the lamp must be
properly disposed of according to federal, state, and local laws.
The WARNING heading in the user documentation explains dangers that might result in personal injury or death. Always read
the associated information very carefully before performing the indicated procedure.
The CAUTION heading in the user documentation explains hazards that could damage the instrument. Such damage may
invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits — including the power
transformer, test leads, and input jacks — must be purchased from Keithley Instruments. Standard fuses with applicable national
safety approvals may be used if the rating and type are the same. Other components that are not safety-related may be
purchased from other suppliers as long as they are equivalent to the original component (note that selected parts should be
purchased only through Keithley Instruments to maintain accuracy and functionality of the product). If you are unsure about the
applicability of a replacement component, call a Keithley Instruments office for information.
To clean an instrument, use a damp cloth or mild, water-based cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit b oard with
no case or chassis (e.g., a data acquisition board for installation into a computer) should never require cleaning if handled
according to instructions. If the board becomes contaminated and operation is affected, the board should be returned to the
factory for proper cleaning/servicing.
Safety precaution revision as of January 2013.

Introduction .......................................................................................................... 1-1
Welcome ......................................................................................................................... 1-1
Extended warranty........................................................................................................... 1-1
Contact information ......................................................................................................... 1-1
CD-ROM contents ........................................................................................................... 1-2
Organization of manual sections ...................................................................................... 1-2
Key features .................................................................................................................... 1-3
Standard accessories ...................................................................................................... 1-3
Optional accessories ....................................................................................................... 1-4
Available services ............................................................................................................ 1-5
General ratings ................................................................................................................ 1-5
General operation ................................................................................................. 2-1
Front-panel overview ....................................................................................................... 2-1
Rear-panel overview ........................................................................................................ 2-3
Front-panel user interface ................................................................................................ 2-4
Home screens ........................................................................................................................... 2-4
Menu overview ........................................................................................................................ 2-10
Adjusting the backlight brightness and timer ........................................................................... 2-21
Installing the system ...................................................................................................... 2-22
Handle and bumpers ............................................................................................................... 2-22
Dimensions ............................................................................................................................. 2-27
Power the instrument on and off ............................................................................................. 2-31
Test connections ........................................................................................................... 2-33
Front-panel connector ............................................................................................................. 2-34
Rear-panel output mating connector ....................................................................................... 2-35
Two-wire local sense connection ............................................................................................ 2-36
Four-wire sense connection .................................................................................................... 2-36
Open leads detection .............................................................................................................. 2-37
Reverse sense leads ............................................................................................................... 2-39
Remote communication interfaces ................................................................................. 2-40
Supported remote interfaces ................................................................................................... 2-40
GPIB communication .............................................................................................................. 2-40
LAN communication ................................................................................................................ 2-43
USB communications .............................................................................................................. 2-55
How to install the Keithley I/O Layer ....................................................................................... 2-61
Set voltage and current limit........................................................................................... 2-62
Constant voltage (CV) and constant current (CC) mode ......................................................... 2-63
Select a measurement function ...................................................................................... 2-65
Select a specific measurement range ............................................................................ 2-65
Selecting a specific measurement range ................................................................................ 2-66
Using Autoranging for Current Measurements ........................................................................ 2-66
Protection ...................................................................................................................... 2-67
Table of Contents

Table of Contents Series 2280 Precision Measurement DC Power Supplies Reference Manual
Overvoltage protection ............................................................................................................ 2-67
Overcurrent protection ............................................................................................................ 2-68
Overtemperature protection .................................................................................................... 2-69
Overprotection error ................................................................................................................ 2-70
Maximum voltage limits ........................................................................................................... 2-70
Saving setups ................................................................................................................ 2-71
Save a user setup ................................................................................................................... 2-72
Recall a user setup ................................................................................................................. 2-73
Specify a default setup ............................................................................................................ 2-73
Using the event log ........................................................................................................ 2-74
Information provided for each event log entry ......................................................................... 2-74
Save the event log to an external flash drive........................................................................... 2-74
Clear the event log .................................................................................................................. 2-74
System information ........................................................................................................ 2-75
Instrument sounds ......................................................................................................... 2-75
Resets ........................................................................................................................... 2-76
Reset the instrument ............................................................................................................... 2-76
Functions and features ......................................................................................... 3-1
Instrument access ........................................................................................................... 3-1
Changing the instrument access mode ..................................................................................... 3-1
Changing the password ............................................................................................................ 3-2
Graph .............................................................................................................................. 3-2
Changing the window position and zoom .................................................................................. 3-3
Adjusting the scale and offset of Y-Axis .................................................................................... 3-4
Output delay, slew rate, and source delay ........................................................................ 3-5
Output delay .............................................................................................................................. 3-5
Slew rate ................................................................................................................................... 3-6
Source delay ............................................................................................................................. 3-6
Reading buffer ................................................................................................................. 3-7
Effects of reset and power cycle on buffer ................................................................................ 3-7
Buffer fill status.......................................................................................................................... 3-7
Setting reading buffer size and buffer mode.............................................................................. 3-8
Viewing and saving buffer content ............................................................................................ 3-9
Configuring the statistics applied to data in the buffer ............................................................. 3-12
Clearing buffer......................................................................................................................... 3-15
Automatically clearing buffer ................................................................................................... 3-16
Digital I/O ...................................................................................................................... 3-16
Digital I/O port ......................................................................................................................... 3-16
Configuring digital I/O lines ..................................................................................................... 3-19
Trigger model ................................................................................................................ 3-21
Idle and initiate ........................................................................................................................ 3-23
Arm layer ................................................................................................................................. 3-23
Trigger layer ............................................................................................................................ 3-23
Source, source delay and measure actions ............................................................................ 3-23
Counter ................................................................................................................................... 3-24
Meter complete ....................................................................................................................... 3-24
Running the trigger model ....................................................................................................... 3-24
Level trigger .................................................................................................................. 3-26
Configuring a voltage level trigger ........................................................................................... 3-26
Configuring a current level trigger ........................................................................................... 3-28

Series 2280 Precision Measurement DC Power Supplies Reference Manual Table of Contents
List operation ................................................................................................................. 3-30
Configuring a list ..................................................................................................................... 3-31
Importing a list from an external USB flash drive .................................................................... 3-33
Exporting a list to an external USB flash drive ........................................................................ 3-34
Running a list .......................................................................................................................... 3-34
Aborting a list .......................................................................................................................... 3-43
Sink operation ............................................................................................................... 3-44
Reset default values ...................................................................................................... 3-44
Default value ........................................................................................................................... 3-45
Measurement optimization ................................................................................... 4-1
Introduction ..................................................................................................................... 4-1
Optimizing either measurement accuracy or speed .......................................................... 4-1
Resolution ................................................................................................................................. 4-2
NPLC ........................................................................................................................................ 4-3
Autozero measurements ........................................................................................................... 4-4
Displayed digits ......................................................................................................................... 4-5
Filtering measurement data....................................................................................................... 4-6
Math calculations that you can apply to measurements .................................................. 4-10
mx+b ....................................................................................................................................... 4-10
Setting mx+b math operations ................................................................................................ 4-10
Relative offset................................................................................................................ 4-11
Establishing a relative offset value .......................................................................................... 4-12
Displayed measurements .............................................................................................. 4-13
Select the source of readings .................................................................................................. 4-14
Application examples ........................................................................................... 5-1
Simple voltage output and current measurement ............................................................. 5-1
Equipment required ................................................................................................................... 5-1
Set up remote communications ................................................................................................. 5-1
Device connections ................................................................................................................... 5-2
Set the voltage and current limit ................................................................................................ 5-2
Configure and execute a 10-step linear list sweep............................................................ 5-3
Equipment required ................................................................................................................... 5-3
Set up remote communications ................................................................................................. 5-4
Device connections ................................................................................................................... 5-4
Configure a 10-step linear list sweep ........................................................................................ 5-4
Execute a 10-step linear list sweep ........................................................................................... 5-5
Perform a fast current load measurement ........................................................................ 5-6
Equipment required ................................................................................................................... 5-7
Set up remote communications ................................................................................................. 5-7
Device connections ................................................................................................................... 5-8
Measure the fast current load changes ..................................................................................... 5-9
Introduction to SCPI commands........................................................................... 6-1
Introduction to SCPI ........................................................................................................ 6-1
Command messages ................................................................................................................ 6-1
Command execution rules......................................................................................................... 6-2
SCPI command programming notes ................................................................................ 6-2

Table of Contents Series 2280 Precision Measurement DC Power Supplies Reference Manual
SCPI command formatting ........................................................................................................ 6-2
Using the SCPI command reference ......................................................................................... 6-4
SCPI command reference ..................................................................................... 7-1
Common commands........................................................................................................ 7-1
*CLS .......................................................................................................................................... 7-2
*ESE ......................................................................................................................................... 7-2
*ESR? ....................................................................................................................................... 7-3
*IDN? ........................................................................................................................................ 7-4
*OPC ......................................................................................................................................... 7-4
*LANG? ..................................................................................................................................... 7-5
*RCL ......................................................................................................................................... 7-5
*RST ......................................................................................................................................... 7-6
*SAV ......................................................................................................................................... 7-6
*SRE ......................................................................................................................................... 7-7
*STB? ........................................................................................................................................ 7-8
*TRG ......................................................................................................................................... 7-9
*TST? ........................................................................................................................................ 7-9
*WAI ........................................................................................................................................ 7-10
:ABORt[n] ................................................................................................................................ 7-11
:CONFigure[n]:<function> ....................................................................................................... 7-11
:FETCh[n]? .............................................................................................................................. 7-12
:FORMat:ELEMents ................................................................................................................ 7-13
:FORCe:TRIGger .................................................................................................................... 7-15
:MEASure[n]:<function>? ........................................................................................................ 7-16
:READ[n]? ............................................................................................................................... 7-17
ARM subsystem ............................................................................................................ 7-17
:ARM[:SEQuence[n]]:COUNt .................................................................................................. 7-18
:ARM[:SEQuence[n]]:SOURce ................................................................................................ 7-18
CALCulate subsystem ................................................................................................... 7-19
:CALCulate[1]:<function>:FORMat.......................................................................................... 7-19
:CALCulate[1]:<function>:KMATh:MBFactor ........................................................................... 7-20
:CALCulate[1]:<function>:KMATh:MMFactor .......................................................................... 7-21
:CALCulate[1]:<function>:KMATh:MUNits............................................................................... 7-22
:CALCulate[1]:<function>:STATe ............................................................................................ 7-23
:CALCulate2:DATA? ............................................................................................................... 7-24
:CALCulate2:FORMat ............................................................................................................. 7-25
:CALCulate2:FORMat:ELEMents ............................................................................................ 7-27
:CALCulate2:FUNCtion ........................................................................................................... 7-28
:CALCulate2:IMMediate .......................................................................................................... 7-29
:CALCulate2:STATe ................................................................................................................ 7-31
CALibration subsystem .................................................................................................. 7-31
:CALibration:PROTected:CANCel ........................................................................................... 7-32
:CALibration:PROTected:CODE ............................................................................................. 7-32
:CALibration:PROTected:COUNt? .......................................................................................... 7-33
:CALibration:PROTected:DATA? ............................................................................................ 7-33
:CALibration:PROTected:DATE .............................................................................................. 7-34
:CALibration:PROTected[:DC[n]]:STEP<step> ....................................................................... 7-35
:CALibration:PROTected[:DC[n]]:STEP<step>:DATA ............................................................. 7-37
:CALibration:PROTected:SAVE .............................................................................................. 7-39
:CALibration:PROTected:STATe............................................................................................. 7-40
Digital subsystem .......................................................................................................... 7-40
:DIGital:LINE<n>:FUNCtion .................................................................................................... 7-41
:DIGital:LINE<n>:MANual:INPut:DATA? ................................................................................. 7-41
DISPlay subsystem ....................................................................................................... 7-42
:DISPlay:BRIGhtness .............................................................................................................. 7-42

Series 2280 Precision Measurement DC Power Supplies Reference Manual Table of Contents
:DISPlay:CLEar ....................................................................................................................... 7-43
:DISPlay:SCREen ................................................................................................................... 7-43
:DISPlay:USER:TEXT[:DATA]................................................................................................. 7-44
INITiate subsystem ........................................................................................................ 7-44
:INITiate[n]:CONTinuous ......................................................................................................... 7-45
:INITiate[n][:IMMediate] ........................................................................................................... 7-45
MMEMory subsystem .................................................................................................... 7-46
:MMEMory:LOAD:SETup ........................................................................................................ 7-46
:MMEMory:SAVE:SETup ........................................................................................................ 7-46
OUTPut subsystem ....................................................................................................... 7-47
:OUTPut:DELay:FALLing ........................................................................................................ 7-47
:OUTPut:DELay:RISing ........................................................................................................... 7-48
:OUTPut:DELay:STATe .......................................................................................................... 7-49
:OUTPut:PROTection:CLEar................................................................................................... 7-49
:OUTPut:PROTection:TRIPped?............................................................................................. 7-50
:OUTPut[:STATe] .................................................................................................................... 7-51
SENSe subsystem......................................................................................................... 7-51
:SENSe[n]:FUNCtion ............................................................................................................... 7-51
:SENSe[n]:<function>:AVERage:COUNt ................................................................................ 7-52
:SENSe[n]:<function>:AVERage[:STATe] ............................................................................... 7-53
:SENSe[n]:<function>:AVERage:TCONtrol ............................................................................. 7-54
:SENSe[n]:<function>:AVERage:WINDow .............................................................................. 7-55
:SENSe[n]:<function>:DIGits ................................................................................................... 7-56
:SENSe[n]:<function>:NPLCycles ........................................................................................... 7-57
:SENSe[n]:<function>:RANGe ................................................................................................ 7-58
:SENSe[n]:<function>:RANGe:AUTO ..................................................................................... 7-59
:SENSe[n]:<function>:REFerence........................................................................................... 7-60
:SENSe[n]:<function>:REFerence:ACQuire ............................................................................ 7-61
:SENSe[n]:<function>:REFerence:STATe............................................................................... 7-62
:SENSe[n]:<function>:RESolution ........................................................................................... 7-63
SOURce subsystem ...................................................................................................... 7-63
[:SOURce[n]]:DELay ............................................................................................................... 7-64
[:SOURce[n]]:DELay:STATe ................................................................................................... 7-64
[:SOURce[n]]:<function>:PROTection[:LEVel] ........................................................................ 7-65
[:SOURce[n]]:<function>[:LEVel][:IMMediate][:AMPLitude] ..................................................... 7-66
[:SOURce[n]]:VOLTage:LIMit[:AMPLitude].............................................................................. 7-67
[:SOURce[n]]:VOLTage:SLEW:RISing .................................................................................... 7-67
[:SOURce[n]]:VOLTage:SLEW:FALLing ................................................................................. 7-68
[:SOURce[n]]:LIST<list number>:<element> ........................................................................... 7-69
[:SOURce[n]]:LIST<list number>:<element>:APPEnd ............................................................ 7-70
[:SOURce[n]]:LIST<list number>:<element>:POINts? ............................................................ 7-71
[:SOURce[n]]:LIST:END:ZERO ............................................................................................... 7-71
[:SOURce[n]]:LIST:HTIMe ....................................................................................................... 7-72
[:SOURce[n]]:LIST:LOAD:USB ............................................................................................... 7-72
[:SOURce[n]]:LIST:MCOMPlete .............................................................................................. 7-73
[:SOURce[n]]:LIST:RCL .......................................................................................................... 7-74
[:SOURce[n]]:LIST:SAVE:INTErnal ......................................................................................... 7-78
[:SOURce[n]]:LIST:SAVE:USB................................................................................................ 7-78
[:SOURce[n]]:LIST:STATe ...................................................................................................... 7-79
STATus subsystem ....................................................................................................... 7-82
:STATus:MEASurement[:EVENt]? .......................................................................................... 7-83
:STATus:MEASurement:ENABle ............................................................................................ 7-83
:STATus:MEASurement:INSTrument[:EVENt]? ...................................................................... 7-84
:STATus:MEASurement:INSTrument:ENABle ........................................................................ 7-84
:STATus:MEASurement:INSTrument:ISUMmary[:EVENt]? .................................................... 7-85
:STATus:MEASurement:INSTrument:ISUMmary:ENABle ...................................................... 7-85
:STATus:MEASurement:INSTrument:ISUMmary:CONDition? ................................................ 7-86

Table of Contents Series 2280 Precision Measurement DC Power Supplies Reference Manual
:STATus:OPERation[:EVENt]?................................................................................................ 7-87
:STATus:OPERation:ENABle .................................................................................................. 7-87
:STATus:OPERation:INSTrument[:EVENt]? ........................................................................... 7-88
:STATus:OPERation:INSTrument:ENABle.............................................................................. 7-88
:STATus:OPERation:INSTrument:ISUMmary[:EVENt]? ......................................................... 7-89
:STATus:OPERation:INSTrument:ISUMmary:ENABle ............................................................ 7-89
:STATus:OPERation:INSTrument:ISUMmary:CONDition? ..................................................... 7-90
:STATus:PRESet .................................................................................................................... 7-91
:STATus:QUEStionable[:EVENt]? ........................................................................................... 7-91
:STATus:QUEStionable:ENABle ............................................................................................. 7-92
:STATus:QUEStionable:INSTrument[:EVENt]?....................................................................... 7-92
:STATus:QUEStionable:INSTrument:ENABle ......................................................................... 7-93
:STATus:QUEStionable:INSTrument:ISUMmary[:EVENt]? ..................................................... 7-94
:STATus:QUEStionable:INSTrument:ISUMmary:ENABle ....................................................... 7-94
:STATus:QUEStionable:INSTrument:ISUMmary:CONDition? ................................................ 7-95
SYSTem subsystem ...................................................................................................... 7-95
:SYSTem:AZERo[n][:STATe] .................................................................................................. 7-96
:SYSTem:BEEPer:ERRor[:STATe] ......................................................................................... 7-96
:SYSTem:COMMunication:ABORt .......................................................................................... 7-97
:SYSTem:COMMunication:LAN:CONFigure ........................................................................... 7-98
:SYSTem:COMMunication:LAN:MACaddress?....................................................................... 7-99
:SYSTem:DATE ...................................................................................................................... 7-99
:SYSTem:ERRor? ................................................................................................................. 7-100
:SYSTem:ERRor:CLEar ........................................................................................................ 7-100
:SYSTem:ERRor:CODE[:NEXT]? ......................................................................................... 7-101
:SYSTem:ERRor:COUNt?..................................................................................................... 7-101
:SYSTem:EVENtlog:SAVE .................................................................................................... 7-102
:SYSTem:GPIB:ADDRess..................................................................................................... 7-102
:SYSTem:KCLick .................................................................................................................. 7-103
:SYSTem:LOCal.................................................................................................................... 7-104
:SYSTem:LFRequency? ....................................................................................................... 7-104
:SYSTem:PASSword:LOCK .................................................................................................. 7-105
:SYSTem:PASSword:MODE ................................................................................................. 7-105
:SYSTem:PASSword:NEW ................................................................................................... 7-106
:SYSTem:PASSword:UNLock ............................................................................................... 7-106
:SYSTem:POSetup:STATe ................................................................................................... 7-107
:SYSTem:PRESet ................................................................................................................. 7-107
:SYSTem:RWLock ................................................................................................................ 7-108
:SYSTem:TIME ..................................................................................................................... 7-109
:SYSTem:VERSion? ............................................................................................................. 7-109
TRACe subsystem....................................................................................................... 7-109
:TRACe[n]:CLEar or :DATA[n]:CLEar ................................................................................... 7-110
:TRACe[n]:CLEar:AUTO or :DATA[n]:CLEar:AUTO.............................................................. 7-110
:TRACe[n]:DATA? or :DATA[n]:DATA? ................................................................................. 7-111
:TRACe[n]:DATA:SELected? or :DATA[n]:DATA:SELected? ................................................ 7-112
:TRACe[n]:FEED or :DATA[n]:FEED ..................................................................................... 7-114
:TRACe[n]:FEED:CONTrol or :DATA[n]:FEED:CONTrol....................................................... 7-115
:TRACe[n]:POINts or :DATA[n]:POINts ................................................................................. 7-116
:TRACe[n]:POINts:ACTual? or :DATA[n]:POINts:ACTual? ................................................... 7-116
:TRACe[n]:SAVE or :DATA[n]:SAVE ..................................................................................... 7-117
:TRACe[n]:TRIGger:CURRent:DIRection .............................................................................. 7-118
:TRACe[n]:TRIGger:CURRent[:LEVel] .................................................................................. 7-118
:TRACe[n]:TRIGger:CURRent:STATe .................................................................................. 7-119
:TRACe[n]:TRIGger:OCCUR?............................................................................................... 7-120
:TRACe[n]:TRIGger:OFFSet ................................................................................................. 7-120
:TRACe[n]:TRIGger:VOLTage:DIRection .............................................................................. 7-121
:TRACe[n]:TRIGger:VOLTage[:LEVel] .................................................................................. 7-122
:TRACe[n]:TRIGger:VOLTage:STATe .................................................................................. 7-122
TRIGger subsystem ..................................................................................................... 7-123

Series 2280 Precision Measurement DC Power Supplies Reference Manual Table of Contents
:TRIGger[:SEQuence[n]]:COUNt........................................................................................... 7-123
:TRIGger[:SEQuence[n]]:SAMPle:COUNt ............................................................................. 7-124
:TRIGger[:SEQuence[n]]:SOURce ........................................................................................ 7-124
Troubleshooting guide ......................................................................................... 8-1
Introduction ..................................................................................................................... 8-1
Contacting support .......................................................................................................... 8-1
What to do if the power supply does not turn on ............................................................... 8-2
LAN troubleshooting suggestions..................................................................................... 8-2
Error summary................................................................................................................. 8-3
Next steps ............................................................................................................. 9-1
Additional Series 2280 information ................................................................................... 9-1
Maintenance ......................................................................................................... A-1
Introduction ..................................................................................................................... A-1
Line fuse replacement ..................................................................................................... A-1
Upgrading the firmware ................................................................................................... A-2
From the front panel .................................................................................................................. A-3
Cleaning the front-panel display ....................................................................................... A-4
Verification ........................................................................................................... B-1
Overview ......................................................................................................................... B-1
Test record ...................................................................................................................... B-1
DC voltage setting accuracy with remote sense........................................................................ B-3
DC voltage setting accuracy without remote sense................................................................... B-3
DC voltage readback accuracy with remote sense ................................................................... B-4
DC voltage readback accuracy without remote sense .............................................................. B-4
DC voltage line regulation ......................................................................................................... B-4
DC voltage load regulation ........................................................................................................ B-5
DC overvoltage protection ......................................................................................................... B-5
DC current accuracy ................................................................................................................. B-5
DC current readback accuracy .................................................................................................. B-6
DC current line regulation.......................................................................................................... B-7
DC current load regulation ........................................................................................................ B-7
DC overcurrent protection ......................................................................................................... B-8
Voltage noise at 20 MHz ........................................................................................................... B-8
Current noise at 20 MHz ........................................................................................................... B-8
Performance verification procedures ................................................................................ B-8
Performance verification conditions .......................................................................................... B-9
Required equipment ................................................................................................................ B-10
Check DC voltage setting readback accuracy with remote sense ........................................... B-10
Check DC voltage setting accuracy without remote sense ..................................................... B-12
Check DC voltage readback accuracy without remote sense ................................................. B-14
Check DC voltage line regulation ............................................................................................ B-16
Check DC voltage load regulation ........................................................................................... B-18
Check DC overvoltage protection............................................................................................ B-19
Check DC current accuracy .................................................................................................... B-19

Table of Contents Series 2280 Precision Measurement DC Power Supplies Reference Manual
Check DC current readback accuracy (10 A and 1 A ranges) ................................................. B-20
Check DC current readback accuracy (100 mA and 10 mA ranges) ....................................... B-22
Check DC current line regulation ............................................................................................ B-24
Check DC current load regulation ........................................................................................... B-26
Check overcurrent protection .................................................................................................. B-27
Check voltage noise (20 MHz) ................................................................................................ B-27
Check current noise (20 MHz)................................................................................................. B-29
Calibration............................................................................................................ C-1
Overview ......................................................................................................................... C-1
Environmental conditions ................................................................................................. C-1
Warmup period.......................................................................................................................... C-2
Line power................................................................................................................................. C-2
Calibration considerations................................................................................................ C-2
Calibration cycle ........................................................................................................................ C-2
Required equipment .................................................................................................................. C-3
Characterization shunts ............................................................................................................ C-3
Calibration connection ..................................................................................................... C-6
Voltage calibration connection .................................................................................................. C-6
Current calibration connections ................................................................................................. C-8
Front-panel calibration procedure .................................................................................... C-9
Voltage calibration................................................................................................................... C-10
Low-current calibration ............................................................................................................ C-11
High-current calibration ........................................................................................................... C-12
Saving calibration constants from the front panel.................................................................... C-13
Remote calibration procedure ........................................................................................ C-14
Remote voltage calibration ...................................................................................................... C-14
Remote low-current calibration................................................................................................ C-16
Remote high-current calibration .............................................................................................. C-17
Saving calibration constants using SCPI comands ................................................................. C-20
Configure the calibration date ................................................................................................. C-20
Exit the calibration procedure using SCPI commands ............................................................ C-20
Change the calibration password ................................................................................... C-21
Calibration constants ..................................................................................................... C-22
Status model ........................................................................................................ D-1
Overview ......................................................................................................................... D-1
Programming and reading registers ................................................................................. D-4
Programming enable registers .................................................................................................. D-4
Reading the registers ................................................................................................................ D-5
Clearing the registers....................................................................................................... D-5
Status byte and service request ....................................................................................... D-5
Status Byte Register ................................................................................................................. D-6
Service Request Enable Register ............................................................................................. D-7
Status register sets .......................................................................................................... D-7
Register bit descriptions ............................................................................................................ D-8
Event registers ........................................................................................................................ D-17
Event enable registers ............................................................................................................ D-17
Condition registers .................................................................................................................. D-17
Queues ......................................................................................................................... D-17

Series 2280 Precision Measurement DC Power Supplies Reference Manual Table of Contents
Output queue .......................................................................................................................... D-17
Error queue ............................................................................................................................. D-18
Serial polling and SRQ .................................................................................................. D-18
Status model programming examples ............................................................................ D-18
SRQ when reading buffer becomes full ................................................................................... D-18
SRQ when trigger model is finished ........................................................................................ D-19

In this section:
Welcome .................................................................................. 1-1
Extended warranty ................................................................... 1-1
Contact information .................................................................. 1-1
CD-ROM contents .................................................................... 1-2
Organization of manual sections .............................................. 1-2
Key features ............................................................................. 1-3
Standard accessories ............................................................... 1-3
Optional accessories ................................................................ 1-4
Available services .................................................................... 1-5
General ratings......................................................................... 1-5
Welcome
Thank you for choosing a Keithley Instruments product. The Series 2280 Precision Measurement DC
Power Supplies are high-sensitivity, low-noise, and programmable instruments that source low noise,
stable voltage, and can monitor load currents over a wide dynamic range from amperes to
nanoamperes. With a high-resolution, 4.3 inch TFT color display, numerous parameters describing
the state of the instrument are displayed to enable you to get the most information from your
measurements.
In addition, you can monitor trends such as drift with the built-in plotting functionality. As a power
supply in an automated test system, this power supply provides a list mode and triggers, and speed
optimization to minimize test time.
Extended warranty
Additional years of warranty coverage are available on many products. These valuable contracts
protect you from unbudgeted service expenses and provide additional years of protection at a fraction
of the price of a repair. Extended warranties are available on new and existing products. Contact your
local Keithley Instruments office, sales partner, or distributor for details.
Contact information
If you have any questions after you review the information in this documentation, please contact your
local Keithley Instruments office, sales partner, or distributor, or call Keithley Instruments corporate
headquarters (toll-free inside the U.S. and Canada only) at 1-800-935-5595, or from outside the
U.S. at [phone].
Section 1
Introduction

Section 1: Introduction Series 2280 Precision Measurement DC Power Supplies Reference Manual
1-2 077085501 / February 2015
CD-ROM contents
The Series 2280 Product Information CD-ROM is shipped with each Series 2280 instrument.
(Keithley Instruments part number 063-4507-00)
The Series 2280 Product Information CD-ROM contains:
Quick Start Guide: Provides unpacking instructions, describes basic connections, reviews basic
operation information, and provides a quick test procedure to ensure the instrument is
operational.
Reference Manual: Includes advanced operation topics, maintenance information,
troubleshooting procedures, and in-depth descriptions of programming commands.
Accessories information: Documentation for accessories that are available for the Series 2280.
Drivers and release notes: IVI Instrument Driver, National Instruments LabVIEW™ driver, and
related release notes.
Organization of manual sections
The information in this manual is organized into the following major categories:
General operation: Describes the components of the instrument and basic operation.
Functions and features: Describes features and functions, such as measure operations, list
mode, reading buffers, triggering, the digital I/O port, graph function, output delay, and slew rate.
Measurement optimization: Describes best practices and recommended procedures that can
increase measurement speed, accuracy, and sensitivity.
Introduction to SCPI commands: Describes how to control the instrument using SCPI
commands.
SCPI command reference: Contains programming notes and an alphabetical listing of all SCPI
commands available for the Series 2280.
Troubleshooting guide: Describes the event log and basic LAN troubleshooting.
Application examples: Provides set-ups for applications, such as for low-current measurements,
and list mode operations.
Next steps: Contains sources of additional information.
Maintenance: Contains information about instrument maintenance, including line fuse
replacement and firmware upgrades.
Calibration: Contains information about instrument calibration from the front panel and using
SCPI commands.
Status model: Describes the Series 2280 status model.
The PDF version of this manual contains bookmarks for each section. The manual sections are also
listed in the Table of Contents at the beginning of this manual.
For more information about bookmarks, see Adobe® Acrobat® or Reader® help.

Series 2280 Precision Measurement DC Power Supplies Reference Manual Section 1: Introduction
077085501 / February 2015 1-3
Key features
The Series 2280 has the following features:
 High current resolution and sensitivity to measure a wide range of load currents
 6 ½-digit measurement resolution to enable a wide range of measurements while on one current
range
 Fast current measurements to test or study load current pulses as narrow as 140 µs
 Real-time data logging for a long period that you specify
 Linear mode, low noise output
 Color TFT display with icon-based and soft key user interface
 Adjustable output rise and fall times to control loads with high in-rush currents
 Data logging and analysis with graphical display and statistics for trend analysis
 Up to 9 groups of user-definable lists with up to 99 steps for each list
 GPIB, USBTMC and LAN LXI interfaces for automated test development
 Filtering to reduce noise on load current readings
 Digital I/O for direct communication with other instruments
 Direct parameter entry using the numeric keypad, soft keys, or the navigation wheel
 Front-panel USB-A connector for flash-drive support
 Front and rear inputs with remote sense connections on the rear panel connector
 Overcurrent, overvoltage, and overtemperature protection
 Compact, 2U, half rack, stackable form factor fits easily in a test rack
Model
Description
2280S-32-6
Precision measurement DC power supply. 32 V, 6 A
2280S-60-3
Precision measurement DC power supply. 60 V, 3.2 A
Standard accessories
Accessory
Part number
Model 2280-001 Output Mating Connector
2280-001
LAN crossover cable
CA-180-3A
Documentation CD
063450700
Quick start guide
For details, see the following table.
KickStart software guide
KKS-903-01C
Certification of Calibration

Section 1: Introduction Series 2280 Precision Measurement DC Power Supplies Reference Manual
1-4 077085501 / February 2015
You will get one of the following quick start guides.
Languages
Part number
English
071319000
Simplified Chinese
071326000
Traditional Chinese
071326100
French
071325400
Spanish
071325700
Italian
071325500
German
071325600
Japanese
071325800
Portuguese
071325900
Korean
071326200
Russian
071326300
Optional accessories
Optional accessory
Part number
Model 2280-001 Output Mating Connector
2280-001
USB Cable Type A to B, 1 m (3.3 ft)
USB-B-1
LAN crossover cable
CA-180-3A
IEEE-488.2 Interface Board for the PCI Bus
KPCI-488LPA
Double Shielded Premium IEEE-488 Interface Cables, 0.5m (1.6 ft)
7007-05
Double Shielded Premium IEEE-488 Interface Cables, 1m (3.2 ft)
7007-1
Double Shielded Premium IEEE-488 Interface Cables, 2m (6.5 ft)
7007-2
Double Shielded Premium IEEE-488 Interface Cables, 3m (10 ft)
7007-3
Double Shielded Premium IEEE-488 Interface Cables, 4m (13 ft)
7007-4
Single Fixed Rack-Mount Kit
4299-8
Dual Fixed Rack-Mount Kit
4299-9
Dual Fixed Rack-Mount Kit for one 2U Graphical Display Instrument
and one Series 24xx, Series 2000, or 2U Agilent Instrument
4299-11
Dual Fixed Rack-Mount Kit for one 2U Graphical Display Instrument
and one Series 26xx Instrument
4299-10
Model 2450-TLINK Trigger link Cable
131909200

Series 2280 Precision Measurement DC Power Supplies Reference Manual Section 1: Introduction
077085501 / February 2015 1-5
Available services
Service
Model Number
1 additional year of factory warranty beyond the 3-Year factory
warranty (total of 4 years)
2280S-32-6-EW
2280S-60-3-EW
2 additional years of factory warranty beyond the 3-Year factory
warranty (total of 5 years)
2280S-32-6-5Y-EW
2280S-60-3-5Y-EW
KeithleyCare® 3 Year Standard Calibration Plan
C/2280S-32-6-3Y-STD
C/2280S-60-3-3Y-STD
KeithleyCare 3 Year Calibration w/Data Plan
C/2280S-32-6-3Y-DATA
C/2280S-60-3-3Y-DATA
KeithleyCare 5 Year Standard Calibration Plan
C/2280S-32-6-5Y-STD
C/2280S-60-3-5Y-STD
KeithleyCare 5 Year Calibration w/Data Plan
C/2280S-32-6-5Y-DATA
C/2280S-60-3-5Y-DATA
KeithleyCare 3 Year ISO 17025 Calibration Plan
C/2280S-32-6-3Y-1702
C/2280S-60-3-3Y-1702
KeithleyCare 5 Year ISO 17025 Calibration Plan
C/2280S-32-6-5Y-1702
C/2280S-60-3-5Y-1702
General ratings
The Series 2280 instrument's general ratings and connections are listed in the following table.
Category
Specification
Supply voltage range
Four ranges: 100 V 120 V, 220 V, 240 V and each range capable of +/-10%
tolerance, 50 Hz or 60 Hz.
Selectable by the line-voltage selector switch on the rear panel.
Output connections
See Test connections (on page 2-33).
Environmental conditions
For indoor use only.
Altitude: Maximum 2000 meters (6562 feet) above sea level.
Operating: 0 °C to 40 °C (32 °F to 104 °F), full accuracy to 80% relative humidity
at up to 35 °C (95 °F), non-condensing.
Storage: -20 °C to 70 °C (-4 °F to 158 °F), 5% to 95% relative humidity at up to 40
°C (+104 °F) and 5% to 60% relative humidity above 40 °C (+104 °F) up to 70 °C
(+158 °F).
Pollution degree: 2.
Line fuse characteristics are shown in the following table.
Model
100 V/120 V AC source
220 V/240 V AC source
2280S-32-6
250 V, 5 A, Time delay
250 V, 2.5 A, Time delay
2280S-60-3
250 V, 5 A, Time delay
250 V, 2.5 A, Time delay