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Tektronix KEITHLEY 3731 Instructions Manual
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Tektronix KEITHLEY 3731 Instructions Manual

Tektronix KEITHLEY 3731 Instructions Manual

6x16 high-speed matrix card
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Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-833-9200
tek.com/keithley
Introduction
The 3731 is a two-pole, 6 row by 16 column reed relay matrix card. By using high-speed reed relays with
actuation times of 0.5 ms, this card meets the requirements of demanding throughput applications while offering
users the additional benefit of long life, exceeding one billion operations. The card can connect up to six
differential instrument channels to any combination of 16 devices under test (DUTs). Any row can be connected
to the Series 3700A mainframe backplane by using the analog backplane connection relays. This allows for easy
matrix column expansion. A matrix of up to 6 rows by 96 columns can be supported within a single 3706A
mainframe with six 3731 cards.
The 3731 uses two 50-pin male D-sub connectors for signal connections. For screw-terminal connections, use
the detachable 3731-ST accessory. For more information regarding available cards and accessories, refer to the
Series 3700A System Switch/Multimeter and Plug-in Cards datasheet, available at tek.com/keithley.
The 3731 card is shown in the following figure.
Item shipped may vary from model pictured here.
This document describes how to install the plug-in card and make connections to it. For information on scanning,
and on reading, writing, and controlling channels, refer to the Series 3700A System Switch/Multimeter Reference
Manual, available at tek.com/keithley.
077183900 October 2024
Model 3731 6×16 High-Speed Matrix Card
Figure 1: Model 3731 6×16 High-Speed Card
*P077183900*
Instructions
1

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Summary of Contents for Tektronix KEITHLEY 3731

  • Page 1 Model 3731 6×16 High-Speed Matrix Card Keithley Instruments Instructions 28775 Aurora Road Cleveland, Ohio 44139 1-800-833-9200 tek.com/keithley Introduction The 3731 is a two-pole, 6 row by 16 column reed relay matrix card. By using high-speed reed relays with actuation times of 0.5 ms, this card meets the requirements of demanding throughput applications while offering users the additional benefit of long life, exceeding one billion operations.

  • Page 2: Card Installation

    Model 3731 6×16 High-Speed Matrix Card Instructions Safety precautions for connections Shock hazard. To prevent electric shock that could result in serious injury or death, comply with these safety precautions. Connection information for plug-in cards is intended for qualified service personnel. Do not attempt to connect devices under test (DUTs) or external circuitry to a plug-in card unless you are qualified.
  • Page 3 Model 3731 6×16 High-Speed Matrix Card Instructions To install a switching card into the instrument mainframe: 1. Turn the instrument off. 2. Position the instrument so that you are facing the rear panel. 3. Disconnect the power line cord and any other cables connected to the rear panel. 4.

  • Page 4: Connection Information

    Model 3731 6×16 High-Speed Matrix Card Instructions Verify card installation To verify that the card was properly installed: 1. If the 3700A is controlled remotely (REM is displayed), press EXIT to switch control to local. 2. On the 3700A front panel, press SLOT. The name and firmware version of the instrument is displayed. 3.
  • Page 5 Model 3731 6×16 High-Speed Matrix Card Instructions Schematic The following figure is a relay schematic for this card. Figure 4: Schematic The channels on this plug-in card are matrix channels. Unlike multiplexer (MUX) channels, matrix channels do not have a DMM configuration associated with them. Therefore, specifying a matrix channel in the channel list parameter to the dmm.setconfig()function generates an error.
  • Page 6 Model 3731 6×16 High-Speed Matrix Card Instructions Pseudocards You can perform open, close, and scan operations and configure your system without having a switch card installed in your instrument. If you are connected to a remote interface, you can assign a pseudocard to an empty switch card slot.
  • Page 7 Model 3731 6×16 High-Speed Matrix Card Instructions Screw-terminal accessory The Model 3731-ST screw-terminal accessory has a chassis ground connection for connecting a cable shield. The 3731-ST screw-terminal accessory is shown in the following figure. The figure indicates the terminals as high or low to help you configure your cable assembly.
  • Page 8 Model 3731 6×16 High-Speed Matrix Card Instructions Wire the screw-terminal accessory These instructions describe how to connect wiring to a Series 3700A screw-terminal accessory. It is not necessary to remove a circuit board from its enclosure to wire the screw-terminal accessory.
  • Page 9 Model 3731 6×16 High-Speed Matrix Card Instructions 4. As shown in the following figure, route your wiring through the slots at the rear of the screw-terminal accessory and connect it to the wiring terminals as described in Connection information (on page 4). Figure 7: Routing and securing cables with ties 5.
  • Page 10 Model 3731 6×16 High-Speed Matrix Card Instructions 7. Slide the cover forward (1) and beneath the retaining tab (2), as shown in the following figure. 8. Fasten the two slotted captive screws (3). Figure 8: Install the screw-terminal assembly top cover Install the screw-terminal accessory Before using a screw-terminal assembly with an installed plug-in card, verify that the card is properly installed in the 3700A instrument and that the mounting screws are tightly fastened.
  • Page 11 Model 3731 6×16 High-Speed Matrix Card Instructions 2. Make sure that the mounting screws (1 in the following figure) on the installed plug-in card are secure. Figure 9: Check 3700A card mounting screws 3. Align the screw-terminal assembly D-sub connectors with the connectors on the installed plug-in card, as shown in the following figure.
  • Page 12 Model 3731 6×16 High-Speed Matrix Card Instructions Remove the screw-terminal accessory To remove a screw-terminal accessory from an installed plug-in card: 1. Remove all power from the 3700A instrument. 2. Turn the knob on the screw-terminal accessory counter-clockwise until it is completely disengaged. You may need to use a slotted screwdriver to loosen the knob.
  • Page 13 Model 3731 6×16 High-Speed Matrix Card Instructions Pin number identification Pin numbers for the Model 3721-MTC-3 D-sub cables are shown in the following figure and table. Connect the drain wire to the shield at both ends of the 3721-MTC-3 cable. Figure 12: Model 3721-MTC-3 connectors Model 3721-MTC-3 pin number identification CONN 1...
  • Page 14 Model 3731 6×16 High-Speed Matrix Card Instructions Hardware interlocks This plug-in card can switch high-voltage signals. To prevent exposure to hazardous voltages, the plug-in card includes a hardware interlock. The hardware interlocks are present on the plug-in card and are designed to keep the plug-in card disconnected from the 3700A backplane.
  • Page 15 Model 3731 6×16 High-Speed Matrix Card Instructions Engage hardware interlocks To engage the hardware interlocks, you must provide a low-resistance path between the two applicable interlock pins, as shown in the figure in Hardware interlocks (on page 14). This path routes a 5 V power source to an onboard interlock relay, which in turn enables power to the backplane relays.
  • Page 16 Model 3731 6×16 High-Speed Matrix Card Instructions Power budgeting and calculation Individual relay power consumption generally depends on the type of relay. Latching relays consume power briefly to open or close and are not a concern when budgeting power. Nonlatching relays continuously consume power to maintain their state, so they must be considered when budgeting for power consumption.
  • Page 17 Model 3731 6×16 High-Speed Matrix Card Instructions Power budgeting example with six 3731 cards This example is for a fully loaded 3706A-S with all 3731 switch cards. Slot Card Channel relays closed Backplane relays closed 3731 3731 3731 3731 3731 3731 This produces the power consumption shown in the following table.
  • Page 18 Model 3731 6×16 High-Speed Matrix Card Instructions Power budgeting example with multiple cards This example is for a fully loaded 3706A-S with a mix of switch cards. Slot Card Channel relays closed Backplane relays closed 3720 3721 3722 15 (2-pole) 3724 3731 3732...
  • Page 19 Model 3731 6×16 High-Speed Matrix Card Instructions Model 3731 connection log Use this table to record your 3731 connection information. Connection Color Description ROW 1 ROW 2 ROW 3 ROW 4 ROW 5 ROW 6 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6...

  • Page 20: Safety Precautions

    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 personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury.
  • Page 21 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.