Keithley 2308 User manual

www.keithley.com
A GREATER MEASURE OF CONFIDENCE
www.keithley.com
A GREATER MEASURE OF CONFIDENCE
Model 2308 Portable Device
Battery/Charger Simulator
User’s Manual
2308-900-01 Rev. A / July 2008
Model 2308 Portable Device
Battery/Charger Simulator
User’s Manual
2308-900-01 Rev. A / July 2008
2308-900-01.qxp 7/28/08 11:07 AM Page 1

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A G R E A T E R M E A S U R E O F C O N F I D E N C E
Keithley Instruments, Inc.
Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139
440-248-0400 • Fax: [phone] • 1-888-KEITHLEY (1-888-534-8453) • www.keithley.com
3/07
WARRANTY
Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of
one (1) year from date of shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables,
software, rechargeable batteries, diskettes, and documentation.
During the warranty period, Keithley Instruments will, at its option, either repair or replace any product that proves
to be defective.
To exercise this warranty, write or call your local Keithley Instruments representative, or contact
Keithley Instruments headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions.
Send the product, transportation prepaid, to the indicated service facility. Repairs will be made and the product
returned, transportation prepaid. Repaired or replaced products are warranted for the balance of the original
warranty period, or at least 90 days.
LIMITATION OF WARRANTY
This warranty does not apply to defects resulting from product modification without Keithley Instruments’ express
written consent, or misuse of any product or part. This warranty also does not apply to fuses, software,
non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow
instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES
PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY
DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE
OF ITS INSTRUMENTS AND SOFTWARE, EVEN IF KEITHLEY INSTRUMENTS, INC. HAS BEEN ADVISED IN
ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT
ARE NOT LIMITED TO: COST OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF
INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.

Model 2308 Portable Device
Battery/Charger Simulator
User’s Manual
©2008, Keithley Instruments, Inc.
All rights reserved.
Any unauthorized reproduction, photocopy, or use the information herein, in whole or in part, without the prior written
approval of Keithley Instruments, Inc. is strictly prohibited.
TSP, TSP-Link, and TSP-Net are trademarks of Keithley Instruments, Inc. All other brand names are trademarks or
registered trademarks of their respective holders.
Cleveland, Ohio, U.S.A.
2308-900-01 Rev. A / July 2008
Document Number:

Safety Precautions
11/07
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 non-hazardous 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 rated Measurement Category I and Measurement
Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and
data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high transient
over-voltages. Measurement Category II connections require protection for high transient over-voltages often associated with local AC
mains connections. Assume all measurement, control, and data I/O connections are for connection to Category I sources unless otherwise
marked or described in the user documentation.
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 30V RMS, 42.4V peak,
or 60VDC 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 1000V, 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.
The instrument and accessories must be used in accordance with its specifications and operating instructions, or the safety of 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 safety earth 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 safety earth ground using the wire recommended in the user documentation.
The symbol on an instrument indicates that the user should refer to the operating instructions located in the user documentation.
The symbol on an instrument shows that it can source or measure 1000V or more, including the combined effect of normal and
common mode voltages. 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 board 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.
!

Section Topic Page
1 Getting Started ....................................................................................... 1-1
Overview..................................................................................................... 1-2
Applications ................................................................................................ 1-2
Performance features ................................................................................. 1-2
Warranty information .................................................................................. 1-2
Contact information..................................................................................... 1-2
Specifications.............................................................................................. 1-3
Inspection ................................................................................................... 1-3
Options and accessories ............................................................................ 1-3
Power supply overview............................................................................... 1-3
Remote display option ................................................................................ 1-5
Power-up .................................................................................................... 1-7
Line power connection ......................................................................... 1-7
Power-up sequence ............................................................................. 1-7
Fuse replacement ................................................................................ 1-8
Display modes ............................................................................................ 1-8
Default settings......................................................................................... 1-11
Setups - Save, Power-on, and Recall ................................................ 1-12
Menu......................................................................................................... 1-12
Getting around the MENU ........................................................................ 1-14
SCPI programming ................................................................................... 1-15
2 Basic Power Supply Operation .......................................................... 2-1
Test connections ........................................................................................ 2-2
Remote sense ...................................................................................... 2-5
Local sense .......................................................................................... 2-5
RFI considerations ............................................................................... 2-6
Outputting voltage and current ................................................................... 2-6
Setting voltage protection value ........................................................... 2-6
Selecting proper current range............................................................. 2-8
Selecting current limit mode................................................................. 2-8
Editing output voltage and current limit values..................................... 2-9
Using the OPERATE key.................................................................... 2-11
Output bandwidth...................................................................................... 2-11
Output impedance .................................................................................... 2-12
Changing the battery channel’s output impedance ............................ 2-12
SCPI programming - outputting voltage and current ................................ 2-13
Command notes (outputting voltage and current) .............................. 2-14
Reading back V and I ............................................................................... 2-16
V and I display modes (Single or Dual)............................................. 2-16
Measurement configuration................................................................ 2-16
SCPI programming — measure V and I, and DVM input ......................... 2-17
Command notes (measure V and I, and DVM input) ......................... 2-18
Independent voltage measurements (DVM) ............................................. 2-18
DVM input display mode .................................................................... 2-18
Measurement configuration................................................................ 2-19
SCPI programming - DVM........................................................................ 2-19
Sink operation........................................................................................... 2-19
Table of Contents

Table of Contents Model 2308 Portable Device Battery/Charger Simulator User’s Manual
ii 2308-900-01 Rev. A / July 2008
Section Topic Page
Programming examples ............................................................................ 2-21
Outputting and reading back V and I .................................................. 2-21
DVM measurements ........................................................................... 2-21
Analog output ............................................................................................ 2-22
3 Pulse Current Measurements.............................................................. 3-1
Overview ..................................................................................................... 3-2
Trigger level .......................................................................................... 3-2
Trigger delay......................................................................................... 3-3
Integration times ................................................................................... 3-3
Average readings count........................................................................ 3-4
Measurement configuration......................................................................... 3-4
Current range ....................................................................................... 3-5
Integration times ................................................................................... 3-5
Average readings count........................................................................ 3-5
Trigger delay and trigger level .............................................................. 3-6
Pulse current display mode .................................................................. 3-7
Pulse current measurement procedure....................................................... 3-7
No pulses detected............................................................................... 3-8
Determining correct trigger level (pulse current)................................... 3-9
TRIG NOT DETECTED message....................................................... 3-11
SCPI programming - pulse current measurements................................... 3-12
Command notes (pulse current measurements) ................................ 3-14
Using FAST, SEARch, and DETect..................................................... 3-16
Pulse current digitization ........................................................................... 3-19
Pulse current step method ........................................................................ 3-20
TLEV steps ......................................................................................... 3-21
Timeout setting ................................................................................... 3-25
Integration time ................................................................................... 3-25
Range with pulse current step ............................................................ 3-26
Programming examples ............................................................................ 3-26
Pulse current measurements.............................................................. 3-26
Pulse current digitization .................................................................... 3-27
Pulse current STEP method (battery channel only)............................ 3-27
4 Long Integration Measurements ........................................................ 4-1
Overview ..................................................................................................... 4-2
Integration time ..................................................................................... 4-3
Trigger edge ......................................................................................... 4-3
Trigger level .......................................................................................... 4-3
Pulse timeout........................................................................................ 4-4
Measurement configuration......................................................................... 4-6
Current range ....................................................................................... 4-6
Integration time ..................................................................................... 4-6
Pulse timeout........................................................................................ 4-7
Trigger edge and trigger level............................................................... 4-7
Long integration display mode.............................................................. 4-8
Long integration measurement procedure .................................................. 4-8
General notes ....................................................................................... 4-9
Determining correct trigger level (long integration)............................... 4-9
SCPI programming.................................................................................... 4-11
Command notes (long integration measurements)............................. 4-12
Using FAST, SEARch, and DETect..................................................... 4-12
Programming examples ............................................................................ 4-16
5 Relay Control .......................................................................................... 5-1
Overview ..................................................................................................... 5-2
Connections ................................................................................................ 5-3
Controlling relays ........................................................................................ 5-4
SCPI programming...................................................................................... 5-5

Model 2308 Portable Device Battery/Charger Simulator User’s Manual Table of Contents
2308-900-01 Rev. A / July 2008 iii
Section Topic Page
6 GPIB Operation....................................................................................... 6-1
Introduction ................................................................................................. 6-2
GPIB bus connections................................................................................. 6-2
Primary address .......................................................................................... 6-3
Setting the GPIB timeout for responses...................................................... 6-4
Long integration readings ..................................................................... 6-4
Pulse current readings.......................................................................... 6-4
MAV (Message Available Bit) ............................................................... 6-4
General bus commands .............................................................................. 6-5
REN (remote enable)............................................................................ 6-5
IFC (interface clear) .............................................................................. 6-6
LLO (local lockout)................................................................................ 6-6
GTL (go to local) ................................................................................... 6-6
DCL (device clear) ................................................................................ 6-6
SDC (selective device clear)................................................................. 6-6
GET (group execute trigger) ................................................................. 6-6
SPE, SPD (serial polling)...................................................................... 6-6
Front panel aspects of GPIB operation ....................................................... 6-6
Remote indicator and LOCAL key ........................................................ 6-7
Error and status messages................................................................... 6-7
Programming syntax ................................................................................... 6-7
Command words................................................................................... 6-7
Program messages............................................................................... 6-9
Response messages .......................................................................... 6-11
Message exchange protocol............................................................... 6-12
7 Status Structure...................................................................................... 7-1
Overview ..................................................................................................... 7-2
Status byte and SRQ ............................................................................ 7-2
Status register sets ............................................................................... 7-2
Queues ................................................................................................. 7-2
Clearing registers and queues .................................................................... 7-3
Programming and reading registers............................................................ 7-4
Programming enable registers.............................................................. 7-4
Reading registers.................................................................................. 7-5
Status byte and service request (SRQ)....................................................... 7-5
Status byte register ............................................................................... 7-6
Service request enable register............................................................ 7-7
Serial polling and SRQ ......................................................................... 7-7
Status byte and service request commands ......................................... 7-8
Status register sets...................................................................................... 7-8
Register bit descriptions ....................................................................... 7-8
Condition registers .................................................................................... 7-12
Event registers.................................................................................... 7-12
Event enable registers ........................................................................ 7-13
Queues...................................................................................................... 7-14
Output queue...................................................................................... 7-15
Error queue......................................................................................... 7-15
Programming example - read error queue.......................................... 7-16
8 Common Commands ............................................................................ 8-1
Overview ..................................................................................................... 8-2
IEEE-488.2 common commands and queries............................................. 8-2
*IDN? .................................................................................................... 8-2
*OPC..................................................................................................... 8-3
*SAV <NRf> and RCL <NRf> ............................................................... 8-3
*RST ..................................................................................................... 8-4
*TRG..................................................................................................... 8-4
*TST?.................................................................................................... 8-4
*WAI...................................................................................................... 8-4

Table of Contents Model 2308 Portable Device Battery/Charger Simulator User’s Manual
iv 2308-900-01 Rev. A / July 2008
Section Topic Page
9 Measurement Commands and
Optimizing Measurement Speed ........................................................ 9-1
Overview ..................................................................................................... 9-2
Command notes: Signal-oriented measurement commands
and queries........................................................................................... 9-3
Optimizing measurement speed ................................................................. 9-5
Auto Zero State..................................................................................... 9-5
Programming examples........................................................................ 9-6
GPIB 488.1 protocol.................................................................................... 9-7
Selecting the 488.1 protocol ................................................................. 9-7
Protocol differences .............................................................................. 9-8
Trigger on talk both channels ...................................................................... 9-9
Bus commands................................................................................... 9-10
Command notes ................................................................................. 9-10
Trigger continuous mode........................................................................... 9-10
Bus commands................................................................................... 9-10
Command notes ................................................................................. 9-11
Using trigger continuous mode........................................................... 9-11
Programming sequence example ....................................................... 9-11
10 DISPlay and FORMat ........................................................................... 10-1
DISPlay subsystem ................................................................................... 10-2
Command notes (SCPI commands - display)..................................... 10-2
FORMat subsystem .................................................................................. 10-4
Command notes (SCPI commands - data format).............................. 10-5
11 SCPI Tables............................................................................................ 11-1
SCPI command subsystems reference tables .......................................... 11-2
General notes ..................................................................................... 11-2
DISPlay command summary .............................................................. 11-3
FORMat command summary.............................................................. 11-4
OUTPut command summary .............................................................. 11-5
SENSe command summary .............................................................. 11-6
SOURce command summary........................................................... 11-13
STATus command summary............................................................. 11-14
SYSTem command summary ........................................................... 11-15
12 Performance Verification.................................................................... 12-1
Introduction ............................................................................................... 12-2
Verification test requirements.................................................................... 12-2
Environmental conditions.................................................................... 12-2
Warm-up period .................................................................................. 12-2
Line power .......................................................................................... 12-3
Recommended test equipment ................................................................. 12-3
Resistor connections .......................................................................... 12-3
Resistor considerations ...................................................................... 12-4
Verification limits ....................................................................................... 12-4
Example limits calculation................................................................... 12-4
Performing the verification test procedures............................................... 12-4
Test summary ..................................................................................... 12-4
Test considerations............................................................................. 12-5
Output voltage accuracy ........................................................................... 12-5
Voltage readback accuracy ....................................................................... 12-7
Compliance current accuracy.................................................................... 12-8
Current readback accuracy ....................................................................... 12-9
5 A range readback accuracy ............................................................. 12-9
500 mA range readback accuracy.................................................... 12-10
50 mA range readback accuracy...................................................... 12-12
5 mA range readback accuracy........................................................ 12-13
Digital voltmeter input accuracy .............................................................. 12-15