Keithley 3720 User manual

www.keithley.com
A GREATER MEASURE OF CONFIDENCE
Series 3700 System Switch/Multimeter
User’s Manual
3700S-900-01 Rev. A / August 2007

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.

System Switch/Multimeter
User's Manual
©2007, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Document Number: 3700S-900-01 Rev. A / August 2007
Series 3700

Manual Print History
The print history shown below lists the printing dates of all Revisions and Addenda created for
this manual. The Revision Level letter increases alphabetically as the manual undergoes
subsequent updates. Addenda, which are released between Revisions, contain important
change information that the user should incorporate immediately into the manual. Addenda are
numbered sequentially. When a new Revision is created, all Addenda associated with the
previous Revision of the manual are incorporated into the new Revision of the manual. Each
new Revision includes a revised copy of this print history page.
Document Number: 3700S-900-01 Rev. A ........................................August 2007
All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand names are trademarks or registered trademarks of their respective holders.

Safety Precautions
06/07
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 documentaion.
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.
!

Table of Contents
Introduction 1-1
Overview......................................................................................................................1-1
Measure and switching capabilities .................................................................................1-2
Reference manual content ..............................................................................................1-2
Warranty information....................................................................................................1-3
Displaying the unit's serial number ..................................................................................1-3
Safety symbols and terms ............................................................................................1-4
Specifications...............................................................................................................1-4
Using the Front Panel 2-1
Front panel introduction................................................................................................2-1
Display.........................................................................................................................2-3
Front panel keys ..........................................................................................................2-6
Special keys and power switch .......................................................................................2-6
Operation keys...............................................................................................................2-7
Range, multifunction keys, and wheel ........................................................................... 2-17
Function keys............................................................................................................... 2-17
Rear Panel 3-1
Rear panel summary....................................................................................................3-1
Rear panel connections................................................................................................3-2
Analog backplane AMPS fuse.........................................................................................3-2
Slots ..............................................................................................................................3-2
TSP-Link connector ........................................................................................................3-2
Instrument fuse .............................................................................................................. 3-2
Power connector ............................................................................................................3-2
Digital I/O port ................................................................................................................ 3-3
GPIB connector..............................................................................................................3-4
Ethernet connector (RJ-45)............................................................................................. 3-4
USB connectors ............................................................................................................. 3-4
Analog backplane connector........................................................................................... 3-5
Switching module installation and connections .............................................................3-6
Module installation .......................................................................................................3-6
Connections................................................................................................................... 3-8
Pseudocards ..................................................................................................................3-9
Channel assignments .....................................................................................................3-9
Bus operation.............................................................................................................3-10
Power-up ...................................................................................................................3-11
Line power connection.................................................................................................. 3-11
Power-up sequence...................................................................................................... 3-12

Contents
System Switch/Multimeter
User's Manual
ii
Document Number: 3700S-900-
01 Rev. A / August 2007
Closing and Opening Switching Module Channels 4-1
Close/open overview....................................................................................................4-1
Channel operation (non-channel pattern operation) .........................................................4-2
Channel pattern operation ..............................................................................................4-2
Close/open commands and operation .............................................................................4-5
Close/open bus operation ............................................................................................... 4-6
Close/open key operation ...............................................................................................4-7
Channel attributes ..........................................................................................................4-7
Duality with example....................................................................................................... 4-8
Channel and backplane notation................................................................................... 4-10
Channel list parameter <ch_list> ................................................................................... 4-12
Channel operation......................................................................................................4-13
2-wire functions ............................................................................................................ 4-14
4-wire functions (paired channels)................................................................................. 4-14
Identifying installed modules and viewing closed channels .........................................4-15
Switching module queries (remote operation) ................................................................ 4-15
Break Before Make and connecting sequentially.........................................................4-16
Relay closure count....................................................................................................4-17
Basic Digital Multimeter (DMM) Operation 5-1
DMM measurement capabilities....................................................................................5-1
High-energy circuit safety precautions ..........................................................................5-2
Performance considerations.........................................................................................5-3
Warm-up........................................................................................................................ 5-3
Autozero ........................................................................................................................5-3
Line cycle synchronization..............................................................................................5-4
Voltage measurements (DCV and ACV).......................................................................5-4
DCV input divider ........................................................................................................... 5-5
Connections................................................................................................................... 5-5
Schematic......................................................................................................................5-7
Voltage measurement procedure ....................................................................................5-8
AC voltage measurements and crest factor .....................................................................5-9
Speed, accuracy, and settling times for AC current and voltage ..................................... 5-11
Low level considerations............................................................................................... 5-14
Current measurements (DCI and ACI)........................................................................5-15
Amps measurement procedure ..................................................................................... 5-15
AMPS analog backplane fuse replacement.................................................................5-16
Resistance measurements .........................................................................................5-17
Basic resistance measurements.................................................................................... 5-17
Offset compensated ohms (OC+).................................................................................. 5-17
Dry circuit testing (DRY+) ............................................................................................. 5-17
Connections................................................................................................................. 5-17
Standard resistance measurements .............................................................................. 5-20
Offset-compensated ohms............................................................................................ 5-20
Dry circuit ohms (DRY+) ............................................................................................... 5-23
Measurement methods ................................................................................................. 5-26

System Switch/Multimeter
User's Manual
Contents
Document Number: 3700S
-900-01 Rev. A / August 2007
iii
Open lead detection ..................................................................................................... 5-30
Temperature measurements ......................................................................................5-35
Thermocouples ............................................................................................................ 5-35
Thermistors.................................................................................................................. 5-41
RTDs (Resistance Temperature Detector)..................................................................... 5-43
Temperature measurement configuration ...................................................................... 5-46
Temperature measurement procedure .......................................................................... 5-47
Frequency and period measurements ........................................................................5-48
Trigger level ................................................................................................................. 5-48
Gate time ..................................................................................................................... 5-48
Frequency connections................................................................................................. 5-49
Frequency and period measurement procedure............................................................. 5-49
Continuity testing .......................................................................................................5-50
Continuity testing connections....................................................................................... 5-51
Continuity testing procedure ......................................................................................... 5-51
ICL Command List 6-1
beeper .........................................................................................................................6-2
bit functions..................................................................................................................6-2
channel functions and attributes ...................................................................................6-2
delay function...............................................................................................................6-4
digio functions and attributes ........................................................................................6-4
display functions and attributes ....................................................................................6-4
dmm functions..............................................................................................................6-5
eventlog functions and attributes ..................................................................................6-8
errorqueue functions and attribute ................................................................................6-8
exit function..................................................................................................................6-9
format attributes...........................................................................................................6-9
gpib attribute................................................................................................................6-9
makegetter functions....................................................................................................6-9
LAN commands ...........................................................................................................6-9
localnode attributes ....................................................................................................6-11
opc function ...............................................................................................................6-11
printbuffer ..................................................................................................................6-11
reset function .............................................................................................................6-12
scan functions............................................................................................................6-12
setup functions and attribute.......................................................................................6-13
slot[X] attributes .........................................................................................................6-13
status function and attributes......................................................................................6-14

Contents
System Switch/Multimeter
User's Manual
iv
Document Number: 3700S-900-
01 Rev. A / August 2007
timer functions............................................................................................................6-16
trigger functions .........................................................................................................6-16
tsplink functions and attributes ...................................................................................6-17
upgrade function ........................................................................................................6-17
userstring functions....................................................................................................6-18
waitcomplete function.................................................................................................6-18
Upgrade Procedure Using USB Flash Drive 7-1
Maintenance 8-1
Introduction ..................................................................................................................8-1
Fuse replacement ........................................................................................................8-1
Front panel tests ..........................................................................................................8-3
Test procedure...............................................................................................................8-3
Series 3700 Module Schematics and Connections 9-1
Maximum power usage with Series 3700 cards ............................................................9-1
Power budgeting and calculation.....................................................................................9-2
Power budgeting examples............................................................................................. 9-4
Model 3720 dual 1x30 multiplexer card ........................................................................9-8
Available accessories: Model 3720 .................................................................................9-8
Connection information: Model 3720 ...............................................................................9-9
Schematics: Model 3720............................................................................................... 9-10
Model 3720 connection log ........................................................................................... 9-11
Model 3721 dual 1x20 multiplexer card ......................................................................9-13
Available accessories: Model 3721 ............................................................................... 9-13
Model 3721-ST accessory board channel list................................................................. 9-14
Connection information: Model 3721 ............................................................................. 9-15
Schematics: Model 3721............................................................................................... 9-16
Model 3721: AMPS channels fuse replacement ............................................................. 9-17
Amps channel fuse replacement procedure................................................................... 9-18
Model 3721 connection log ........................................................................................... 9-20
Model 3722 dual 1x48 high density multiplexer card ...................................................9-22
Available accessories: Model 3722 ............................................................................... 9-22
Connection information: Model 3722 ............................................................................. 9-23
Schematics: Model 3722............................................................................................... 9-24
Model 3722 connection log ........................................................................................... 9-25
Model 3723 dual 1×30 high-speed multiplexer card ....................................................9-28
Available accessories: Model 3723 ............................................................................... 9-28
Connection information: Model 3723 ............................................................................. 9-29
Schematics: Model 3723............................................................................................... 9-30
Model 3723 connection log (60 channel) ....................................................................... 9-32
Model 3723 connection log (120 channel) ..................................................................... 9-34

System Switch/Multimeter
User's Manual
Contents
Document Number: 3700S
-900-01 Rev. A / August 2007
v
Model 3730 6×16 high-density matrix card .................................................................9-38
Available accessories: Model 3730 ............................................................................... 9-38
Connection information: Model 3730 ............................................................................. 9-39
Schematics: Model 3730............................................................................................... 9-39
Model 3730 connection log ........................................................................................... 9-40
Model 3740 32-channel isolated switch card...............................................................9-43
Available accessories: Model 3740 ............................................................................... 9-43
Connection information: Model 3740 ............................................................................. 9-44
Schematics: Model 3740............................................................................................... 9-45
Model 3740 Connection log .......................................................................................... 9-46
Specifications A-1
Series 3700 System Switch/Multimeter Specifications ................................................. A-2
Model 3720 Dual 1x30 Multiplexer Card Specifications................................................ A-8
Model 3721 Dual 1x20 Multiplexer Card ...................................................................... A-9
Model 3722 Dual 1x48 High density Multiplexer Card ................................................ A-10
Model 3723 Dual 1×30 High-speed Multiplexer Card ................................................. A-11
Model 3730 6×16 High-density Matrix Card............................................................... A-12
Model 3740 32-channel isolated switch card.............................................................. A-13
Index Index - 1

List of Figures
Figure 1-1: DMM measurement capabilities......................................................................... 1-2
Figure 2-1: Model 3706 System Switch/Multimeter .............................................................. 2-1
Figure 2-2: Model 3706-S System Switch (no DMM)............................................................ 2-2
Figure 2-3: Model 3706-NFP System Switch/Multimeter ...................................................... 2-3
Figure 2-4: Model 3706-SNFP System Switch (no DMM)..................................................... 2-3
Figure 2-5: Active channel display example......................................................................... 2-4
Figure 2-6: MAIN MENU display.......................................................................................... 2-6
Figure 3-1: Rear panel features........................................................................................... 3-1
Figure 3-2: Digital I/O port ................................................................................................... 3-3
Figure 3-3: USB connectors ................................................................................................ 3-5
Figure 3-4: Analog backplane connector ............................................................................. 3-5
Figure 3-5: Typical module installation................................................................................. 3-7
Figure 4-1: Multiplexer card display ..................................................................................... 4-11
Figure 4-2: Matrix card display ............................................................................................ 4-12
Figure 4-3: Two-wire function .............................................................................................. 4-14
Figure 4-4: Four-wire function.............................................................................................. 4-15
Figure 5-1: Line cycle synchronization................................................................................. 5-4
Figure 5-2: DCV connection ................................................................................................ 5-6
Figure 5-3: ACV connection ................................................................................................ 5-6
Figure 5-4: Rear panel to backplane to DMM connect relays schematic............................... 5-7
Figure 5-5: ACV measurements: sine waves ....................................................................... 5-9
Figure 5-6: ACV measurements: square, pulse, and sawtooth waves .................................. 5-10
Figure 5-7: Two-wire resistance measurements .................................................................. 5-18
Figure 5-8: Four-wire resistance measurement.................................................................... 5-18

List of Figures
System Switch/Multimeter
User's Manual
viii
Document Number: 3700S-900-01 Re
v. A / August 2007
Figure 5-9: Two-wire switching module resistance connection ............................................. 5-19
Figure 5-10: Four-wire switching module resistance connection........................................... 5-19
Figure 5-11: Enabling offset-compensated ohms ................................................................. 5-21
Figure 5-12: Four-wire Ohm ATTR MENU: OFFSETCOMP................................................. 5-22
Figure 5-13: Enabling dry-circuit ohms ................................................................................ 5-24
Figure 5-14: Four-wire Ohm ATTR MENU: DRYCIRCUIT.................................................... 5-24
Figure 5-15: Two-wire constant-current source method ....................................................... 5-27
Figure 5-16: Four-wire constant-current source method....................................................... 5-27
Figure 5-17: Two-wire ratiometric method............................................................................ 5-28
Figure 5-18: Four-wire ratiometric method ........................................................................... 5-29
Figure 5-19: Simplified Dry-Circuit open lead detection schematic ....................................... 5-30
Figure 5-20: Simplified normal four-wire open lead detection schematic .............................. 5-31
Figure 5-21: Simplified Dry-Circuit open V-clamp feedback loop schematic ......................... 5-34
Figure 5-22: Simplified T/C open lead detection schematic.................................................. 5-38
Figure 5-23: Simulated reference junction ........................................................................... 5-40
Figure 5-24: Simulated reference junction switching module................................................ 5-40
Figure 5-25: Internal reference junction (40 channel switching module) ............................... 5-40
Figure 5-26: Thermistor analog backplane connection......................................................... 5-42
Figure 5-27: Thermistor switching module connection ......................................................... 5-42
Figure 5-28: Three-wire RTD connections ........................................................................... 5-44
Figure 5-29: Three-wire RTD switching module connections................................................ 5-44
Figure 5-30: Four-wire RTD connections ............................................................................. 5-45
Figure 5-31: Four-wire RTD switching module connections.................................................. 5-45
Figure 5-32: FREQ and PERIOD input connections............................................................. 5-49
Figure 5-33: FREQ and PERIOD connections (switching module) ....................................... 5-49

System Switch/Multimeter
User's Manual
List of Figures
Document Number: 3700S
-900-01 Rev. A / August 2007
ix
Figure 5-34: Continuity connections .................................................................................... 5-51
Figure 5-35: Continuity connections using a switching module............................................. 5-51
Figure 8-1: Fuse location..................................................................................................... 8-2
Figure 9-1: Model 3720 ....................................................................................................... 9-8
Figure 9-2: D-sub connection information for the Model 3720 .............................................. 9-9
Figure 9-3: Schematic of the Model 3720 ............................................................................ 9-10
Figure 9-4: Sample Model 3720 connection log (1 of 2) ....................................................... 9-11
Figure 9-5: Sample Model 3720 connection log ................................................................... 9-12
Figure 9-6: Model 3721 ....................................................................................................... 9-13
Figure 9-7: D-sub connection information for the Model 3721 .............................................. 9-15
Figure 9-8: Schematic of the Model 3721 in two-pole mode ................................................. 9-16
Figure 9-9: Schematic of the Model 3721 in four-wire common side ohm mode ................... 9-17
Figure 9-10: Model 3721 shield removal.............................................................................. 9-19
Figure 9-11: Model 3721 fuse location................................................................................. 9-19
Figure 9-12: Sample Model 3721 connection log (1 of 2) ..................................................... 9-20
Figure 9-13: Sample Model 3721 connection log (2 of 2) ..................................................... 9-21
Figure 9-14: Model 3722 ..................................................................................................... 9-22
Figure 9-15: D-sub connection information the Model 3722 ................................................. 9-23
Figure 9-16: Schematic for the Model 3722 ......................................................................... 9-24
Figure 9-17: Sample Model 3722 connection log (1 of 3) ..................................................... 9-25
Figure 9-18: Sample Model 3722 connection log (2 of 3) ..................................................... 9-26
Figure 9-19: Sample Model 3722 connection log (3 of 3) ..................................................... 9-27
Figure 9-20: Model 3723 ..................................................................................................... 9-28
Figure 9-21: D-sub connection information for the Model 3723 ............................................ 9-29
Figure 9-22: Schematic for the Model 3723 in two-pole mode.............................................. 9-30

List of Figures
System Switch/Multimeter
User's Manual
x
Document Number: 3700S-900-
01 Rev. A / August 2007
Figure 9-23: Schematic: Model 3723 in one-pole mode ....................................................... 9-31
Figure 9-24: Sample Model 3723 connection log (60 channel)(1 of 2).................................. 9-32
Figure 9-25: Sample Model 3723 connection log (60 channel)(2 of 2).................................. 9-33
Figure 9-26: Sample Model 3723 connection log (120 channel)(1 of 4) ................................ 9-34
Figure 9-27: Sample Model 3723 connection log (120 channel)(2 of 4) ................................ 9-35
Figure 9-28: Sample Model 3723 connection log (120 channel)(3 of 4) ................................ 9-36
Figure 9-29: Sample Model 3723 connection log (120 channel)(4 of 4) ................................ 9-37
Figure 9-30: Model 3730 ..................................................................................................... 9-38
Figure 9-31: D-sub connection information for the Model 3730 ............................................ 9-39
Figure 9-32: Schematic of the Model 3730 .......................................................................... 9-39
Figure 9-33: Sample Model 3730 connection log (1 of 3) ..................................................... 9-40
Figure 9-34: Sample Model 3730 connection log (2 of 3) ..................................................... 9-41
Figure 9-35: Sample Model 3730 connection log (3 of 3) ..................................................... 9-42
Figure 9-36: Model 3740 ..................................................................................................... 9-43
Figure 9-37: D-sub connection information for the Model 3740 ............................................ 9-44
Figure 9-38: Schematic for the Model 3740 ......................................................................... 9-45
Figure 9-39: Sample Model 3740 connection log ................................................................. 9-46

If you have any questions after reviewing this information, please contact your local
Keithley Instruments representative or call one of our Applications Engineers at
1-888-KEITHLEY (1-888-534-8453). You can also contact us through our website at
www.keithley.com.
In this section:
Overview ........................................................................................................ 1-1
Warranty information....................................................................................... 1-3
Safety symbols and terms ............................................................................... 1-4
Specifications.................................................................................................. 1-4
Overview
The Series 3700 instruments offer scalable, instrument grade switching and multi-channel
measurement solutions that are optimized for automated testing of electronic products and
components. The Series 3700 includes four versions of the Model 3706 system switch
mainframe along with a growing family of plug-in switch and control cards. When the Model
3706 mainframe is ordered with the high performance multimeter, you receive a tightly
integrated switch and measurement system that can meet the demanding application
requirements in a functional test system or provide the flexibility needed in stand-alone data
acquisition and measurement applications.
Section 1
Introduction

Section
1: Introduction Series 3700 System Switch/Multimeter
User's Manual
1
-2 Document Number: 3700S-900-
01 Rev. A / August 2007
Measure and switching capabilities
The basic measurement capabilities of Series 3700 systems are summarized in the following
figure.
Figure 1-1: DMM measurement capabilities
Reference manual content
Refer to the Series 3700 Reference Manual for specific listing of advanced operation including:
Range
Digits
Rate Bandwidth
Filter
Relative
Math
dB
Buffer
Scanning
Calibration
Also included in the reference manual is a detailed listing of the Instrument Control Library (ICL)
commands.