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Series 3700A Switch and Control Cards
Reference Manual
3700AS-909-01 Rev. B / December 2011
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Series 3700A Switch and Control Cards
Reference Manual
© 2007-2011, Keithley Instruments, Inc.
Cleveland, Ohio, U.S.A.
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.
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.
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Keithley's standard terms and conditions of sale in effect at the time of acceptance of buyer's order by Keithley
shall apply to all purchase of goods and performance of services from Keithley, to the exclusion of any additional
or different terms and conditions, including any terms or conditions which buyer may purport to apply under any
buyer's request for quotation, purchase order or similar document, or which buyer may offer in
response to these terms. A copy of Keithley's current terms can be accessed at
http://www.keithley.com/company/termsandconditions (these "Terms"). To obtain a printed copy of these Terms,
please contact your local sales office or send an email to orders@keithley.com. Buyer's assent to these Terms,
and only these Terms, shall be conclusively presumed from buyer's acceptance o f delivery of the produ cts a nd/or
services provided by Keithley.
Document number: 3700AS-909-01 Rev. B / December 2011
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 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 transi ent
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
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 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 p ower 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 instructi ons, or the safety of
the equipment may be impaired.
11/07
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 agains t 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.
screw is present, connect it to safety earth ground using the wire recommended in the user documentation.
If a
The ! symbol on an instrument means caution, risk of danger. The user should refer to the operating instructions located in
the user documentation in all cases where the symbol is marked on the instrument.
The
contact with these voltages.
The
The
If this Hg 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 pr ocedure.
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 yo u 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 n ot app ly
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.
symbol on an instrument means caution, risk of electric shock. Use standard safety precautions to avoid personal
symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.
symbol indicates a connection terminal to the equipment frame.
11/07
Table of Contents
Introduction.................................................................................................................1-1
Contact information..............................................................................................................1-1
Safety precautions for connections...................................................................................... 1-1
Series 3700A documentation............................................................................................... 1-2
Series 3700A cards general operation......................................................................2-1
Available cards..................................................................................................................... 2-1
Card installation ................................................................................................................... 2-2
Verifying card installation .......................................................................................................... 2-3
Connection safety ................................................................................................................ 2-3
Pseudocards........................................................................................................................ 2-4
Installed pseudocards ............................................................................................................... 2-5
Series 3700A cards power usage..............................................................................3-1
Maximum power usage with Series 3700A cards................................................................ 3-1
Power budgeting and calculation ..............................................................................................3-2
Power budgeting examples.......................................................................................................3-3
Hardware interlocks ............................................................................................................. 3-7
Engaging hardware interlocks...................................................................................................3-8
Interlock status.......................................................................................................................... 3-8
Interlock pin numbers................................................................................................................3-9
Model 3720 multiplexer card......................................................................................4-1
Introduction to the Model 3720 dual 1x30 multiplexer card....................................................... 4-1
Available accessories: Model 3720........................................................................................... 4-2
Connection information: Model 3720.........................................................................................4-2
Schematics: Model 3720...........................................................................................................4-3
Model 3721 multiplexer card......................................................................................5-1
Introduction to the Model 3721 dual 1x20 multiplexer card....................................................... 5-1
Available accessories: Model 3721........................................................................................... 5-2
Model 3721-ST accessory board channel list............................................................................5-2
Connection information: Model 3721.........................................................................................5-3
Schematics: Model 3721...........................................................................................................5-4
Amps channel fuse replacement procedure..............................................................................5-7
Model 3721: AMPS channels fuse replacement........................................................................5-8
Model 3722 high-density multiplexer card ...............................................................6-1
Introduction to the Model 3722 card..........................................................................................6-1
Available accessories: Model 3722........................................................................................... 6-2
Connection information: Model 3722.........................................................................................6-2
Schematics: Model 3722...........................................................................................................6-3
Table of Contents Series 3700A Switch and Control Cards Reference Manual
Model 3723 high-speed reed relay multiplexer card................................................7-1
Introduction to the Model 3723 card .................................................................................... 7-1
Available accessories: Model 3723...................................................................................... 7-2
Connection information: Model 3723................................................................................... 7-3
Schematics: Model 3723...................................................................................................... 7-4
Model 3724 FET multiplexer card..............................................................................8-1
Introduction to the Model 3724 card .................................................................................... 8-1
Available accessories: Model 3724...................................................................................... 8-2
Connection information: Model 3724................................................................................... 8-2
Schematics: Model 3724...................................................................................................... 8-3
Model 3730 high-density matrix card........................................................................9-1
Introduction to the Model 3730 card .................................................................................... 9-1
Available accessories: Model 3730...................................................................................... 9-2
Connection information: Model 3730................................................................................... 9-2
Schematics: Model 3730...................................................................................................... 9-3
Model 3731 high-speed reed relay matrix card......................................................10-1
Introduction to the Model 3731 card .................................................................................. 10-1
Available accessories: Model 3731.................................................................................... 10-2
Connection information: Model 3731................................................................................. 10-2
Schematics: Model 3731.................................................................................................... 10-3
Model 3732 quad 4x28 reed relay matrix card........................................................11-1
Introduction ........................................................................................................................ 11-1
Additional features ..................................................................................................................11-2
Accessories for Model 3732............................................................................................... 11-2
Maximum power usage with Model 3732 cards................................................................. 11-2
Measurement considerations............................................................................................. 11-3
Channel specifiers..............................................................................................................11-3
Channel types.................................................................................................................... 11-3
Channel and backplane notation ....................................................................................... 11-3
Configuration and connection choices overview .....................................................................11-6
Screw terminal assemblies......................................................................................................11-7
Direct wiring .......................................................................................................................... 11-11
Hardware interlocks ..............................................................................................................11-11
Channel specifiers.................................................................................................................11-12
Card configurations.......................................................................................................... 11-14
ii 3700AS-909-01 Rev. B / December 2011
Series 3700A Switch and Control Cards Reference Manual Table of Contents
Single-pole configurations..................................................................................................... 11-14
Model 3732 2-pole operation...........................................................................................11-35
Two-pole configurations........................................................................................................11-35
Cross-card expansion...................................................................................................... 11-48
Cross-card expansion examples........................................................................................... 11-49
Using the Model 3732 with a digital multimeter...............................................................11-49
External wiring connection method .......................................................................................11-49
Programmatic connection method......................................................................................... 11-50
Alternative jumper connection method..................................................................................11-50
Using the Series 3700A front panel with the Model 3732 card........................................ 11-51
Pseudocard support for the Model 3732..........................................................................11-52
Using remote commands from a remote interface........................................................... 11-52
New remote commands ........................................................................................................11-52
Model 3740 general purpose card...........................................................................12-1
Introduction to the Model 3740 card .................................................................................. 12-1
Available accessories: Model 3740.................................................................................... 12-2
Connection information: Model 3740................................................................................. 12-2
Schematics: Model 3740.................................................................................................... 12-3
Model 3750 multifunction control card...................................................................13-1
Introduction to the Model 3750 Card....................................................................................... 13-1
Available accessories: Model 3750......................................................................................... 13-2
Connection information: Model 3750.......................................................................................13-2
Schematics: Model 3750.........................................................................................................13-3
Model 3750 additional information.....................................................................................13-4
Digital I/O ................................................................................................................................ 13-4
Counter/totalizer......................................................................................................................13-8
Analog output........................................................................................................................ 13-10
Using match counts............................................................................................................... 13-18
Latching values.....................................................................................................................13-19
Power consumption implications........................................................................................... 13-19
Series 3700 cards connection logs...........................................................................A-1
Model 3720 connection log..................................................................................................A-2
Model 3721 connection log..................................................................................................A-4
Model 3722 connection log..................................................................................................A-6
Model 3723 connection logs................................................................................................A-9
Model 3723 connection log (60-channel) ..................................................................................A-9
Model 3723 connection log (120-channel) ..............................................................................A-11
Model 3724 connection log................................................................................................A-15
Model 3730 connection log................................................................................................A-18
Model 3732 connection logs..............................................................................................A-18
Dual 4x28 2-pole configuration connection logs......................................................................A-18
Quad 4x28 configuration connection logs ...............................................................................A-23
3700AS-909-01 Rev. A / Preliminary iii
Table of Contents Series 3700A Switch and Control Cards Reference Manual
Single 4x56 2-pole configuration connection logs...................................................................A-27
Dual 4x56 configuration connection logs.................................................................................A-31
Single 4x112 configuration connection logs............................................................................A-35
Single 8x28 2-pole configuration connection logs...................................................................A-39
Dual 8x28 configuration connection logs.................................................................................A-41
Single 16x28 configuration connection logs............................................................................A-44
Model 3740 connection log................................................................................................A-46
Model 3750 connection log................................................................................................A-48
Index................................................................................................................................1
iv 3700AS-909-01 Rev. B / December 2011
In this section:
Contact information.................................................................. 1-1
Safety precautions for connections
Series 3700A documentation
Contact information
If you have any questions after reviewing this information, please contact your local Keithley
Instruments representative or call Keithley Instruments corporate headquarters (toll-free inside the
U.S. and Canada only) at 1-888-KEITHLEY (1-888-534-8453), or from outside the U.S. at
+1-440-248-0400. For worldwide contact numbers, visit the Keithley Instruments website
(http://www.keithley.com).
Section 1
Introduction
.......................................... 1-1
................................................... 1-2
Safety precautions for connections
WARNING
Connection information for switching cards is intended for qualified service personnel. Do not
attempt to connect DUT or external circuitry to a switching card unless qualified to do so.
To prevent electric shock that could result in serious injury or death, comply with these safety
precautions:
Before making or breaking any connections to the switching card, make sure the Series 3700A
is turned off and power is removed from all external circuitry.
Do not connect signals that will exceed the maximum specifications of any installed switching
card.
If both the rear analog backplane connector of the Series 3700A and the switching card
terminals are connected at the same time, the test lead insulation must be rated to the highest
voltage that is connected. For example, if 300V is connected to the analog backplane
connector, the test lead insulation for the switching card must also be rated for 300V.
Dangerous arcs of an explosive nature in a high-energy circuit can cause severe personal
injury or death if contacted. If the multimeter is connected to a high-energy circuit when set to
a current range, low resistance range, or any other low-impedance range, the circuit is
virtually shorted.
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