Tektronix Series 3700A Switch,Control Cards Reference manual
www.tek.com/keithley
Series 3700A Switch and Control Cards
Reference Manual
3700AS-909-01 Rev. C / July 2016
*P3700AS-909-01C*
3700AS-909-01
A Greater Measure of Condence
A Tektr onix Company
Series 3700A
Switch and Control Cards
Reference Man ual
© 2016, Keithley Instruments
Cleveland, Ohio, U.S.A.
All rights reserved.
Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part,
without the prior written approval of Keithley Instruments is strictly prohibited.
All Keithley Instruments product names are trademarks or registered trademarks of Keithley
Instruments. Other brand names are trademarks or registered trademarks of their respective
holders.
Document number: 3700AS-909-01 Rev. C / July 2016
Safety precaut ions
The following safety precautions should be observed before using this product and any associated instrumentation. Although
some instruments and accessories would norma lly be used with nonhazardous voltages, there are situations where hazardous
conditions may be present.
This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions
required to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using
the product. Refer to the user documentation for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the
equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the
instrument. They must be protected from electric shock and contact with hazardous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the line
voltage or replacing consumable materials. Maintenance procedures are described in the user documentation. The procedures
explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, perform safe installations, and repair products. Only properly trained
service personnel may perform installation and service procedures.
Keithley Instruments products are designed for use with electrical signals that are measurement, control, and data I/O
connections, with low transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high
transient overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient
overvoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected to
mains. These instruments will be marked as category II or higher.
Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test
fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than
30 V RMS, 42.4 V peak, or 60 VDC are present. A good safety practice is to expect that hazardous voltage is present in any
unknown circuit before measuring.
Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators
are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock. If
the circuit is capable of operating at or above 1000 V, no conductive part of the circuit may be exposed.
Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance-limited
sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective
devices to limit fault current and voltage to the card.
Before operating an instrument, ensure that the line cord is connected to a properly-grounded power receptacle. Inspect the
connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.
When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input
power disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under
test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting
cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.
Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth)
ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the
voltage being measured.
For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or
accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be
impaired.
Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the
specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.
When fuses are used in a product, replace with the same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as protective earth (safety ground)
connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use
of a lid interlock.
screw is present, connect it to protective earth (safety ground) using the wire recommended in the user documentation.
If a
The symbol on an instrument means caution, risk of danger. The user must refer to the operating instructions located in the
user documentation in all cases where the symbol is mark ed on the instru ment .
The
symbol on an instrument means caution, risk of electr ic shock. Use standard safety precautions to avoid personal
contact with these voltages.
The
The
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.
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 h az ards that coul d dama ge the instr ume nt. Such dam age 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 circu its — inc lud ing 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. The detachable mains power cord provided with the
instrument may only be replaced with a similarly rated power cord. 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.
Unless otherwise noted in product-specific literature, Keithley instruments are designed to operate indoors only, in the following
environment: Altitude at or below 2,000 m (6,562 ft); temperature 0 °C to 50 °C (32 °F to 122 °F) ; and pollution degree 1 or 2.
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 cleanin g/s er v icing.
Safety precaution revision as of March 2016.
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 ............................................................................................................... 2-4
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
Model 3720 dual 1 × 30 multiplexer card ............................................................................. 4-1
Introduction to the Model 3720 dual 1 × 30 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
Model dual 1 × 20 multiplexer card ...................................................................................... 5-1
Introduction to the Model 3721 dual 1 × 20 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 .............................................................................. 5-6
Model 3721: AMPS channels fuse replacement........................................................................ 5-8
Model 3722 high-density multiplexer card .............................................................. 6-1
Model 3722 dual 1 × 48 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
Table of Contents
Reference Manual
Series 3700A Switch and Control Cards
Schematics: Model 3722 ........................................................................................................... 6-3
Model 3723 high-speed reed relay multiplexer card ............................................... 7-1
Model 3723 dual 1 × 30 high-speed multiplexer card .......................................................... 7-1
Introduction to the Model 3723 card .......................................................................................... 7-1
Available accessories: Model 3723 ........................................................................................... 7-2
Connection information: Model 3723 ......................................................................................... 7-2
Schematics: Model 3723 ........................................................................................................... 7-4
Model 3724 FET multiplexer card ............................................................................ 8-1
Model 3724 dual 1 × 30 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
Model 3730 6 × 16 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
Model 3731 6 × 16 high-speed reed 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 4 × 28 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 ............................................................................................. 11-2
Channel specifiers .............................................................................................................. 11-3
Channel types .................................................................................................................... 11-3
Channel and backplane notation ....................................................................................... 11-3
Configuration and connection choice s overv iew ..................................................................... 11-6
Screw terminal assemblies...................................................................................................... 11-7
Direct wiring .......................................................................................................................... 11-10
Hardware interlocks .............................................................................................................. 11-10
Channel specifiers ................................................................................................................. 11-11
Card configurations .......................................................................................................... 11-13
Single-pole configurations ..................................................................................................... 11-13
Model 3732 2-pole operation ........................................................................................... 11-34
Series 3700A
Switch and Control Cards Reference Manual Table
of Contents
Two-pole configurations ........................................................................................................ 11-34
Cross-card expansion ...................................................................................................... 11-47
Cross-card expansion examples ........................................................................................... 11-47
Using the Model 3732 with a digital multimet er ............................................................... 11-48
External wiring connection method ....................................................................................... 11-48
Programmatic connection met hod ......................................................................................... 11-48
Alternative jumper connection method .................................................................................. 11-48
Using the Series 3700A front panel with the Model 3732 card ........................................ 11-49
Pseudocard support for the Model 3732 .......................................................................... 11-49
Using remote commands from a remote interface ........................................................... 11-50
New remote commands ........................................................................................................ 11-50
Model 3740 general purpose card ......................................................................... 12-1
Model 3740 32-channel isolated switch 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
Model 3750 multifunction I/O 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 implicatio ns ........................................................................................... 13-20
Series 3700 cards connection logs ......................................................................... A-1
Series 3700 cards connection logs ...................................................................................... A-2
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 3724 connection log ..................................................................................................... A-15
Model 3730 connection log ..................................................................................................... A-18
Model 3732 connection logs.................................................................................................... A-19
Model 3740 connection log ..................................................................................................... A-46
Model 3750 connection log ..................................................................................................... A-48
Index .................................................................................................................... Index-1
Series 3700A documentation ................................................... 1-2
In this section:
Contact information .................................................................. 1-1
Safety precautions for connections .......................................... 1-1
Contact information
If you have any questions after you review the information in this documentation, please contact your
local Keithley Instruments office, sales partner, or distributor. You can also call the corporate
headquarters of Keithley Instruments (toll-free inside the U.S. and Canada only) at 1-800-935-5595,
or from outside the U.S. at +1-440-248-0400. For worldwide contact numbers, visit the
Instruments website (http://www.tek.com/keithley).
Section 1
Introduction
Keithley
Safety precautions for conn ect i ons
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.
Section
Reference Manual
3700AS-903-01
Series 3700A System Switch/Multimeter
Hardware and software requirements,
3700AS-900-01
Series 3700A System Switch/Multimeter
Information about scanning, reading,
3700AS-901-01
Series 3700A System Switch/Multimeter
Reference Manual
Information about controlling the Series
3700A from a remote interface
PA-949
Series 3700A Cables and Connector
Information about the different cables and
PA-955
Series 3700A Screw Terminal
Contains handling and installation
PA-1021
Model 3732 Quad 4 × 28 Reed Relay
Contains card-specific safety precautions,
1: Introduction Series 3700A Switch and Control Cards
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. Dangerous arcing can result (even when the multimeter is set to a voltage
range) if the minimum voltage spacing is reduced in the external connections. For details
about how to safely make high energy measurements, see High-energy circuit safety
precautions in the
Series 3700A Reference Manual
Electrotechnical Commission (IEC) Standard IEC 664, the Series 3700A is Installation
Category I and must not be connected to mains.
Series 3700A documentation
Complete documentation for the Series 3700A System Switch/Multimeter instruments is available for
download from the Keithley Downloads web page
list of available documentation for the Series 3700A.
Document
number
Document name Content description
. As described in the International
(http://www.tek.com/downloads). The following is a
Quick Start Guide
User's Manual
Kits Installation Instructions
Assemblies Installation Instructions
Matrix Card Connection Information
switching card installation instructions, and
a brief description of front-panel and remote
interface operation
writing, and controlling channels
connector kits that are used on the Series
3700A cards.
instructions for Series 3700A screw
terminal assemblies
list of features and accessories, connection
information, and measurement
considerations
1-2 3700AS-909-01 Rev. C / July 2016
Pseudocards ............................................................................ 2-4
Model 3720 dual 1 × 30 multiplexer card (on page 4-1)
Offers two independent banks of 1 × 30 two-pole
including temperature measurements.
Model 3721 dual 1 × 20 multiplexer card (on page 5-1)
Offers two independent banks of 1 × 20 two-pole
including temperature measurements.
Model 3722 dual 1 × 48 high density multiplexer card (on page 6-
Offers two independent banks of 1 × 48 two-pole
high channel count.
Model 3723 dual 1 × 30 high speed reed relay multiplexer card (on
Offers two independent banks of high speed 1 × 30
scanning applications.
Model 3724 dual 1 × 30 FET multiplexer card (on page 8-1)
Provides two independent banks of solid-state
measurement applications, including temperature.
Two-pole, 6 × 16 column matrix card; can connect
combination of 16 DUTs.
Model 3732 quad 4 × 28 ultra-high density reed relay matrix card
Ultra-high density matrix card; comprised of four
applications.
Model 3740 general purpose card (on page 12-1)
Offers 28 general-purpose form C channels; ideal
for routing power or other control devices.
Model 3750 multifunction control card (on page 13-1)
Offers control and monitoring of your automated
variety of system control applications.
In this section:
Available cards ......................................................................... 2-1
Card installation ....................................................................... 2-2
Connection safety .................................................................... 2-3
Available cards
The next table shows a list of available cards for the Series 3700A System Switch/Multimeter.
Name Description
Section 2
Series 3700A cards general operation
1)
page 7-1)
Model 3730 6 × 16 high density matrix card (on page 9-1)
Model 3731 6 × 16 high speed reed relay matrix card (on page 10-
1)
(on page 11-1)
multiplexers; ideal for general purpose switching,
multiplexers; ideal for general purpose switching,
multiplexers; ideal for applications that require a
two-pole multiplexers; i deal for high speed
relays arranged as 1 × 30 two-pole multiplexers;
ideal for high reliability, high speed multipoint
up to six differential instrument channels to any
Two-pole, 6 × 16 column reed relay matrix card;
using high speed reed relays with actuation times
of 0.5ms, this card meets the requirements of
demanding throughput applications while offering
the additional benefit of long life, exceeding one
billion operations.
banks, each with 4 × 28 columns or reed relays;
provides 448 single-pole crosspoints for maximum
connection versatility in high channel count
test system; 40 digital I/O bits, four counters, and
two analog outputs make it well-suited for a wide
Section
Reference Manual
2: Series 3700A cards general operation Series 3700A Switch and Control Cards
Card installation
Slot covers must be installed on unused slots to prevent personal contact with high voltage
circuits.
Perform the following steps to install a switching card into the instrument mainframe:
1. Turn the instrument off and disconnect the power line cord and any other cables connected to the
rear panel.
2. Position the instrument so that you are facing the rear panel.
3. Remove the slot cover plate from the desired mainframe slot. Retain the plate and screws for
future use.
4. With the top cover of the switching card facing up, align the card's edge into the slot's card guide
and slide in the card. For the last ¼ inch or so, press in firmly to mate the card connector to the
mainframe connector.
5. On each side of the card, there is a mounting screw. Tighten these two screws to secure the card
to the mainframe. Do not overtighten.
6. Reconnect the power line cable and any other cables to the rear panel.
7. Press the SLOT key to see the model numbers, description, and the firmware revision of the
installed switching cards, along with the mainframe firmware and DMM (if present).
Figure 1: Typical module installation
2-2 3700AS-909-01 Rev. C / July 2016
Series 3700A
Series 3700A cards general operation
3
Card edge (part of card)
4
Mounting screw (part of card)
Switch and Control Cards Reference Manual Section 2:
Item Description
1 Card guide (part of Series 3700A)
2 Card
Verifying card installation
To verify that the card was properly installed:
1. If the instrument is controlled remotely (REM is displayed), press EXIT to switch control to local.
2. Press SLOT. The name and firmware version of the instrument is displayed.
3. Press SLOT again. The name and firmware version of the card in slot 1 is displayed.
4. If you have more than one card installed, continue to press SLOT until the slot you just installed is
displayed.
5. Confirm the name and firmware version.
6. Press EXIT to return to the operating display.
Connection safety
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 instrument
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 instrument 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 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.
Dangerous arcing can result (even when the multimeter is set to a voltage range) if the
minimum voltage spacing is reduced in the external connections. For details about how to
safely make high-energy measurements, see High-energy circuit safety precautions.
As described in the International Electrotechnical Commission (IEC) Standard IEC 664, the
instrument is Installation Category I and must not be connected to mains.
3700AS-909-01 Rev. C / July 2016 2-3
Section
Reference Manual
2: Series 3700A cards general operation Series 3700A Switch and Control Cards
Pseudocards
You can perform open, close, and scan operations and configure your system without having an
actual switching card installed in your instrument. Using the remote interface, you can assign a
pseudocard to an empty switching card slot, allowing the instrument to operate as if a switching card
were installed.
A pseudocard cannot be configured from the front panel. However, once the remote configuration is
complete, you can take the instrument out of remote mode and use the front panel. Press the EXIT
key to take the instrument out of remote mode.
A saved setup or created configuration script retains the model number of the card installed in each
slot. The model number of a pseudocard is the same as the model number of an actual card (except
for Model 3732 cards; see the "Pseudocard support for the Model 3732" topic in the Series 3700
Switch and Control Cards Reference Manual for details). This allows a saved setup or created
configuration script to be recalled if the installed card (or pseudocard) matches the model number for
the slot in the saved setup or created configuration script.
When the instrument is turned off, the pseudocard is no longer assigned to the slot.
Installed pseudocards
A pseudocard can be "installed" in any empty slot. With the 3720 pseudocard "installed," the
instrument operates as if a Model 3720 Thermocouple MUX card is installed in the slot. This allows
you to configure a scan and exercise its operation before the switching module is installed in the
Series 3700A. Use the following commands to install Series 3700A pseudocards in empty slots:
For no pseudocard selection (use to remove an existing pseudocard):
slot.PSEUDO_NONE or 0
Model 3720 for Dual 1 × 30 multiplexer card simulation:
slot.PSEUDO_3720 or 3720
Model 3721 for Dual 1 × 20 multiplexer card simulation:
slot.PSEUDO_3721 or 3721
Model 3722 for Dual 1 × 48 multiplexer card simulation:
slot.PSEUDO_3722 or 3722
Model 3723 Dual 1 × 30 reed multiplexer card simulation :
slot.PSEUDO_3723 or 3723
Model 3724 Dual 1 × 30 FET multiplexer card simulation:
slot.PSEUDO_3724 or 3724
Model 3730 6 × 16 high-density matrix card simulation:
slot.PSEUDO_3730 or 3730
Model 3740 32-channel isolated switch card:
2-4 3700AS-909-01 Rev. C / July 2016
slot.PSEUDO_3740 or 3740
Series 3700A
ards general operation
Switch and Control Cards Reference Manual Section 2: Series 3700A c
Model 3750 multifunction I/O card simulation:
slot.PSEUDO_3750 or 3750
For example, to set the attribute to "install" the Model 3720 pseudocard in slot 6:
slot[6].pseudocard = slot.PSEUDO_3720
When queried, the return value has "Pseudo" before the card description. For example:
print(slot[3].idn) → 3720,Pseudo Dual 1x30 Multiplexer,00.00a
The revision level of a pseudocard is always returned as 00.00 a.
Query the slot[X] attributes to determine the capabilities of the installed switching modules. For
example, send the following query to determine if slot 1 supports common-side 4-wire Ω channels:
CommonSideOhms1 = slot[1].commonsideohms
3700AS-909-01 Rev. C / July 2016 2-5
Hardware interlocks ................................................................. 3-7
Slot 1
Slot 4
Slot 2
Slot 5
Slot 3
Slot 6
12300 mW (max)
12300 mW (max)
Series 3700A cards power usage
In this section:
Maximum power usage with Series 3700A cards ..................... 3-1
Maximum power usage with Series 3700A cards
The Series 3700A series offers a growing family of high-density and general-purpose plug-in cards
that accommodates a broad range of signals at very competitive pricing. The Series 3700A supports
applications as diverse as design validation, accelerated stress testing, data acquisition, and
functional testing.
Plug-in cards are capable of switching many relays at once, which can take a substantial amount of
system power. There is a limited amount of system power available for switching relays. Therefore,
use care in order that Series 3700A maximum available power is not exceeded. The maximum power
available is limited on a per-bank basis as follows:
Section 3
Bank 1 Bank 2
Based on the previous table, the total power available for slots 1, 2, and 3 is 12,300 mW (12.3 W).
Similarly, the total power available for slots 4, 5, and 6 is 12.3 W. Attempting to exceed these power
levels results in the system performing as many of the operations as possible until these power limits
are reached. An error message is then created and the remaining operations are not performed.
There is also a maximum slot power limit of 10,500 mW. However, the maximum is rarely a
consideration.
Section
Reference Manual
consumption (milliwatts)
3720
975
NA
100
3722
475
NA
100
3723
700
100 (2-Pole)
100
50 (1-Pole)
100
3724
1150
20
100
3730
780
NA
100
3731
780
67
100
3732
780
17
100
3740
1000
NA (independent)
100
totalizers (730 for all 4; cannot
Example 7 (on page 3-7).
3: Series 3700A cards power usage Series 3700A Switch and Control Cards
Power budgeting and calculation
Individual relay power consumption generally depends on the type of relay. Latching-type relays
consume power only briefly in order to open or close. These types of relays are not of concern for
power budgeting purposes. Nonlatching types of relays continuously consume power in order to
maintain their state. These types of relays must be considered for power budgeting purposes.
Another power consideration is the fact that each plug-in card uses system power in order to operate.
This continuous power draw is known as quiescent power. Quiescent power directly takes away from
the power that is available to operate relays. So it must also be taken into account when budgeting for
power consumption.
The following table shows the power consumption of channel and backplane relays for various Series
3700A plug-in cards. The quiescent power is also shown. For latching-type relays NA is used.
Model Quiescent power
(milliwatts)
3721 1350 NA 100
Channel relay power
consumption (milliwatts) each
Backplane relay power
each
200 (high current) 100
3750 3300
NOTE: The 3300 is reduced
when power is disabled to
each analog output channel
0 each (digital input channel)
365 each (digital output channel)
470 each (analog output)
0 each (totalizers)
(820 each) or disabled to the
be individually disabled)
See Example 5 (on page 3-6),
Example 6 (on page 3-7), and
3-2 3700AS-909-01 Rev. C / July 2016
Series 3700A
Series 3700A cards power usage
Slot 1
3723
30
4
Slot 2
3723
30
4
Slot 3
3723
30
4
Slot 4
3723
30
4
Slot 5
3723
30
4
Slot 6
3723
30
4
Slot 1 power consumed =
700 + 30 × 100
+
4 × 100
=
4100
Slot 2 power consumed =
700 + 30 × 100
+
4 × 100
=
4100
Slot 3 power consumed =
700 + 30 × 100
+
4 × 100
=
4100
Slot 4 power consumed =
700 + 30 × 100
+
4 × 100
=
4100
Slot 5 power consumed =
700 + 30 × 100
+
4 × 100
=
4100
Slot 6 power consumed =
700 + 30 × 100
+
4 × 100
=
4100
Switch and Control Cards Reference Manual Section 3:
To determine if a given quantity of relay operations can be performed, the previous table must be
used to calculate the total power required by applying the example equations:
To check power consumption, each slot power must be computed. The slot power for slots 1 through
3 is added. Also, slot power for slots 4 through 6 are added. The results are called bank powers and
should be compared with the maximum limits. Some example calculations follow.
Power budgeting examples
Example 1
This example is for a fully loaded Model 3706A-S with Model 3723 cards (all 2-pole mode).
Slot # Card Channel relays closed Backplane relays closed
This produces the following power consumption:
3700AS-909-01 Rev. C / July 2016 3-3
Section
Reference Manual
Bank #1 power consumed =
4100
+
4100
+
4100
=
12300
Bank #2 power consumed =
4100
+
4100
+
4100
=
12300
Slot 1
3723
107
1
Slot 2
3723
107
1
Slot 3
Empty
0
0
Slot 4
3723
107
1
Slot 5
3723
107
1
Slot 6
Empty
0
0
Slot 1 power consumed =
700 + 107 × 50
+
1 × 100
=
6150
Slot 2 power consumed =
700 + 107 × 50
+
1 × 100
=
6150
Slot 3 power consumed =
0 + 0 + 0 = 0
Slot 4 power consumed =
700 + 107 × 50
+
1 × 100
=
6150
Slot 5 power consumed =
700 + 107 × 50
+
1 × 100
=
6150
Slot 6 power consumed =
0 + 0 + 0 = 0
Bank #1 power consumed =
6150
+
6150
+ 0 =
12300
Bank #2 power consumed =
6150
+
6150
+ 0 =
12300
3: Series 3700A cards power usage Series 3700A Switch and Control Cards
Totals for each bank are calculated:
Slot 1
Slot 4
Slot 2
Slot 5
Slot 3
Slot 6
Total
Total
Since each bank did not exceed the maximum power, the power budget is within the limits.
Example 2
This example is for a partially loaded Model 3706A with Model 3723 cards (all 1-pole mode).
Slot # Card Channel relays closed Backplane relays closed
This produces the following power consumption:
Totals for each bank are calculated:
Slot 1
Slot 4
Slot 2
Slot 5
Slot 3
Slot 6
Total
Total
Since each bank did not exceed the maximum power, the power budget is within the limits.
3-4 3700AS-909-01 Rev. C / July 2016
Series 3700A
Series 3700A cards power usage
Slot 1
3723
60 4 Slot 2
3723
60 4 Slot 3
3723
60 4 Slot 4
3723
60
4
Slot 5
3723
60
4
Slot 1 power consumed =
700 + 60 × 100
+
4 × 100
=
7100
Slot 2 power consumed =
700 + 60 × 100
+
4 × 100
=
7100
Slot 3 power consumed =
700 + 60 × 100
+
4 × 100
=
7100
Slot 4 power consumed =
700 + 60 × 100
+
4 × 100
=
7100
Slot 5 power consumed =
700 + 60 × 100
+
4 × 100
=
7100
Slot 6 power consumed =
700 + 60 × 100
+
4 × 100
=
7100
Bank #1 power consumed =
7100
+
7100
+
7100
=
21300
Bank #2 power consumed =
7100
+
7100
+
7100
=
21300
Switch and Control Cards Reference Manual Section 3:
Example 3
This example is for a fully loaded Model 3706A-S with Model 3723 cards (all 2-pole mode).
Slot # Card Channel relays closed Backplane relays closed
Slot 6 3723 60 4
This produces the following power consumption:
Totals for each bank are calculated:
Slot 1
Slot 4
Slot 2
Slot 5
Slot 3
Slot 6
Total
Total
Since each bank exceeded the maximum power, some operations will not be performed and an error
will be generated.
3700AS-909-01 Rev. C / July 2016 3-5
Section
Reference Manual
Slot 1
3720
20 2 Slot 2
3721
20 2 Slot 3
3722
15 (2-pole)
4
Slot 4
3723
25 (HI current)
2
Slot 5
3730
10
4
Slot 1 power consumed =
975 + 0 + 2 × 100
=
1175
Slot 2 power consumed =
1350
+ 0 +
2 × 100
=
1550
Slot 3 power consumed =
475 + 0 + 4 × 100
=
875
Slot 4 power consumed =
700 + 25 × 100
+
2 × 100
=
3400
Slot 5 power consumed =
780 + 0 + 4 × 100
=
1180
Slot 6 power consumed =
1000
+
2 × 200
+
4 × 100
=
1800
Bank #1 power consumed =
1175
+
1550
+
875 = 3600
Bank #2 power consumed =
3400
+
1180
+
1800
=
6380
3300
Static power required of card under default
conditions (that is, all functions enabled)
CH 1,2,3 set as INPUT
0
CH 4 set as OUTPUT
365
CH 5 set as OUTPUT
365 CH 10 = V mode
470
CH 11 = I mode
470
Total Power
4970 mW
Since total power per bank ca nnot ex ceed 123 00
3: Series 3700A cards power usage Series 3700A Switch and Control Cards
Example 4
This example is for a fully loaded Model 3706A-S with a mix of cards.
Slot # Card Channel relays closed Backplane relays closed
Slot 6 3740 2 4
This produces the following power consumption:
Totals for each bank are calculated:
Slot 1
Slot 4
Slot 2
Slot 5
Slot 3
Slot 6
Total
Total
Since each bank did not exceed the maximum power, the power budget is within the limits.
Example 5
This example demonstrates how to calculate the card power of the 3750.
Setup Power Notes
mW, only two 3750 cards per bank can be
populated when used in the example configuration.
This leaves spare power (12300 – (4970 * 2)) for
controlling relays on a third card in the bank.
3-6 3700AS-909-01 Rev. C / July 2016
Series 3700A
Series 3700A cards power usage
CH 1 through 5 set as
3300
Static power required of card under default
conditions (that is, all functions enabled).
365 * 5 = 1825
CH 6 through 9 =
-730
Static power is reduced by disabling the
disabled).
output channel.
output channel.
Total Power
2755 mW
Bank power would not be exceeded if three
cards per bank were used in this manner.
conditions (that is, all functions enabled).
0
CH 6 through 9 =
disabled
-730
Static power is reduced by disabling the totalizers
(channels cannot be individually disabled).
CH 10 = V mode
470
CH 11 = V mode
470
Total Power
3510 mW
Bank power would not be exceeded if three cards
per bank were used in this manner.
Switch and Control Cards Reference Manual Section 3:
Example 6
This example demonstrates how to calculate the card power of the 3750 when used only as digital
outputs.
Setup Power Notes
OUTPUT
disabled
totalizers (channels cannot be individually
CH 10 = disabled -820 Static power is reduced by disabling analog
CH 11 = disabled -820 Static power is reduced by disabling analog
Example 7
This example demonstrates how to calculate the card power of the 3750 for digital inputs and two
analog voltage outputs.
Setup Power Notes
CH 1 through 5 set as
INPUT
3300 Static power required of card under default
Hardware interlocks
Some switching cards are capable of switching high-voltage signals. For safety reasons, hardware
interlocks are provided. The hardware interlocks are present on the switching card itself and are
designed to keep the switching card disconnected from the system backplane. This means that when
the interlock circuit is disengaged, no measurements can be performed through a switching card.
However, channel relays can continue to operate.
3700AS-909-01 Rev. C / July 2016 3-7
Below is a simplified schematic of the interlock circuit present on the applicable switching cards.
Section
Reference Manual
3: Series 3700A cards power usage Series 3700A Switch and Control Cards
Figure 2: Simplified interlock circuit
Engaging hardware inter locks
To engage the hardware interlocks, you must provide a low-resistance path between the two
applicable interlock pins as shown in the diagram. This path routes a 5 V power source to an onboard
interlock relay which in turn enables power to the backplane relays. If a 37xxA-ST accessory terminal
board is used, this low resistance path is provided to automatically engage the interlock circuit.
Do not use the supplied 5 V power source for anything other than energizing the interlock relay. It is
not designed for external circuit use.
Be sure to provide a low resistance path between the interlock pins for reliable operation. Significant
resistance if present can cause the interlock circuit to fail to engage.
Interlock status
Some switching cards have more than one interlock. At any time, the current status of each interlock
can be determined by using the appropriate slot[X].interlock.state remote ICL command.
When the interlock status reports engaged, associated backplane relays are allowed to be energized.
When the interlock status reports disengaged, associated backplane relays are prevented from being
energized.
Refer to the Series 3700 A Reference Manual (part number: 3700AS-901-01) for more information on
interlock related commands and details.
3-8 3700AS-909-01 Rev. C / July 2016
Series 3700A
Series 3700A cards power usage
3720
Multiplexer #1
76, 78
n911 through n916
Multiplexer #2
76, 78
n921 through n926
DMM
n928 (DMM HI / SHI)
Multiplexer #2
1, 34
n921 through n927
3722
No Interlocks Present
- -
3723
Multiplexer #1
76, 78
n911 through n916
Multiplexer #2
76, 78
n921 through n926
3724
Multiplexer #1
76, 78
n911 through n916
Multiplexer #2
76, 78
n921 through n926
3730
Matrix #1
48, 50
n911 through n916
3731
Matrix #1
38, 50
n911 through n916
3732
Bank 1, 2, 3, 4
J-3-76, J3-78
s0911 through s0918
Bank #1
3750
No interlocks present
Switch and Control Cards Reference Manual Section 3:
Interlock pin numbers
The following table shows the interlock pin numbers for all applicable switching cards.
Model Interlock circuit Interlock pins Backplane relays
affected
3721 Multiplexer #1, Amps,
3740 Independent Switch
33, 50 n911 through n917 n041, n042 (Amps),
48, 50 n911 through n916
Other relays affected
Take special care not to inadvertently wire high-voltage analog signals to the interlock pins.
Instrument damage or loss of functionality can occur.
3700AS-909-01 Rev. C / July 2016 3-9
Model 3720 dual 1 × 30 multiplexer card ................................. 4-1
Model 3720 mult iplexer card
In this section:
Model 3720 dual 1 × 30 multiplexer card
Introduction to the Model 3 720 dua l 1 × 30 mul ti plexer card
The Model 3720 offers two independent banks of 1×30 two-pole multiplexers (see next figure). It is
ideal for general-purpose switching, including temperature measurements. The two banks can
automatically be connected to the Series 3700A mainframe backplane and optional DMM through the
analog backplane connection relays. This connection allows the mainframe to reconfigure the card to
a single 1×60 two-pole multiplexer or to enable card-to-card expansion for even larger configurations.
Section 4
Other features of the Model 3720 include its ability to be reconfigured to coordinated four-pole
operation for additional measurement flexibility. Furthermore, the Model 3720 supports thermocoupletype temperature measurements with the Model 3720-ST (screw terminal) accessory providing
automatic cold junction compensation (CJC).
The Model 3720 uses two 78-pin male D-sub connectors for signal connections. For screw terminal or
automatic CJC, use the detachable Model 3720-ST accessory.
Figure 3: Model 3720
Section
Reference Manual
4: Model 3720 multiplexer card Series 3700A Switch and Control Cards
Available accessories: Model 3720
Accessory model number Description
Model 3720-MTC-1.5 78-pin female-to-male D-sub cable assembly, 1.5 m (4.9 ft)
Model 3720-MTC-3 78-pin female-to-male D-sub cabl e assembl y, 3 m (9.8 ft)
Model 3720-ST Screw Terminal panel with CJC sensor
Model 3791-KIT78-R 78-pin female D-sub connector kit (solder cup contacts)
7401 Type K thermocouple wire kit
Connection information: M ode l 37 20
Refer to the following figure for the Model 3720 D-sub connection information.
Figure 4: D-sub connection information for th e Model 3720
4-2 3700AS-909-01 Rev. C / July 2016
Series 3700A
Model 3720 multiplexer card
Switch and Control Cards Reference Manual Section 4:
Schematics: Model 3720
The following figure provides a switching schematic for the Model 3720.
Figure 5: Model 3720 schematic
3700AS-909-01 Rev. C / July 2016 4-3
Section
Reference Manual
4: Model 3720 multiplexer card Series 3700A Switch and Control Cards
Figure: Mod el 3720 screw ter minal assembl y circuit board
The next figure is a diagram of the screw terminal assembly:
Figure 6: Model 3720 screw terminal assembly circuit board
4-4 3700AS-909-01 Rev. C / July 2016
Model dual 1 × 20 multiplexer card .......................................... 5-1
In this section:
Model dual 1 × 20 multiplexer card
Introduction to the Model 3 721 dua l 1 × 20 mul ti plexer card
The Model 3721 provides 40 differential channels and automatic cold junction compensation (CJC)
with the 3721-ST accessory. The Model 3721 has two independent banks of 1 × 20 two-pole
multiplexers that are ideal for general-purpose switching, including temperature measurements.
Section 5
Model 3721 mult iplexer card
The Model 3721 provides a number of other features. In addition to the 40 channels, two fused
channels are supplied for current measurements. Also, the Model 3721 includes dedicated inputs that
enable 40 channels of 4-wire commonside ohms measurements. For thermocouple-type
measurements, automatic CJC is supported with the Model 3721-ST (screw terminal) accessory.
The Model 3721 uses two 50-pin male D-sub connectors for signal connections. For screw terminal or
automatic CJC, use the detachable Model 3721-ST accessory.
Figure 7: Model 3721
Section
Reference Manual
Multiplexer # 1 Output
MUX 1 OUT
1 ... 20
1 ... 20
Multiplexer # 2 Output
MUX 2 OUT
21 ... 40
21 ... 40
Amps Channel 41
AMP1
Amps Channel 42
AMP2
DMM HI & SHI Channel n928
DMM
No Connect
NC
5: Model 3721 multiplexer card Series 3700A Switch and Control Cards
Available accessories: Model 3721
Accessory model number Description
Model 3721-MTC-1.5 50-pin female-to-male D-sub cable assembly, 1.5 m (4.9 ft)
Model 3721-MTC-3 50-pin female-to-male D-sub cabl e assembl y, 3 m (9.8 ft)
Model 3721-ST Screw terminal panel with CJC sensor
Model 3790-KIT50-R 50-pin female D-sub connector kit (solder cup contacts)
7401 Type K thermocouple wire kit
Model 3721-ST accessory board channel list
The following table shows the association between the Model 3721-ST accessory and each channel
on the Model 3721.
Channel 3721-ST terminal board silkscreen label
When viewing this table, remember:
• Multiplexer number 1 channels are labeled 1 through 20 and the multiplexer output is labeled
MUX 1 OUT.
• Multiplexer number 2 channels are labeled 21 through 40 and the multiplexer output is labeled
MUX 2 OUT.
• Amps channel 41 is labeled AMP1. This channel is accessed as "n041" where n is the slot
number.
• Amps channel 42 is labeled AMP2. This channel is accessed as "n042" where n is the slot
number.
• DMM HI & SHI channel is labeled DMM. This channel is accessed as "n928" where n is the slot
number.
• No connect channels are labeled NC. Do not connect to these channels.
5-2 3700AS-909-01 Rev. C / July 2016
Series 3700A
Model 3721 multiplexer card
Switch and Control Cards Reference Manual Section 5:
Connection information: Model 3721
Refer to the following figure for the Model 3721 D-sub connection information.
Figure 8: D-sub connection information for the Model 3721
3700AS-909-01 Rev. C / July 2016 5-3
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