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Tektronix KEITHLEY 3723 Instructions Manual
Tektronix KEITHLEY 3723 Instructions Manual

Tektronix KEITHLEY 3723 Instructions Manual

High-speed multiplexer card

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Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-833-9200
tek.com/keithley
Introduction
The Model 3723 has two independent banks of high-speed 1×30 two-pole multiplexers that are ideal for
high-speed scanning applications. The two banks can be automatically connected to the Series 3700A
mainframe backplane and an optional digital multimeter (DMM) through the analog backplane connection relays.
This connection allows the mainframe to reconfigure the Model 3723 as a single 1×30 four-pole multiplexer or as
a single 1×120 single-pole multiplexer. It also enables card-to-card expansion for even larger configurations.
By using high-speed reed relays with actuation times of less than 0.5 ms, this card can meet demanding
throughput applications. Another feature of the 3723 is its single-ended, one-pole mode, which supports up to
120 channels of single-wire measurements.
The 3723 uses two 78-pin D-sub connectors for signal connections. For screw-terminal connections, use the
Model 3723-ST for two and four-pole configurations. 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 3723 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.
077183600 October 2024
Model 3723 High-Speed Multiplexer Card
Figure 1: Model 3723 High-Speed 1 x 30 Card
*P077183600*
Instructions
1

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Summary of Contents for Tektronix KEITHLEY 3723

  • Page 1 Model 3723 High-Speed Multiplexer Card Keithley Instruments Instructions 28775 Aurora Road Cleveland, Ohio 44139 1-800-833-9200 tek.com/keithley Introduction The Model 3723 has two independent banks of high-speed 1×30 two-pole multiplexers that are ideal for high-speed scanning applications. The two banks can be automatically connected to the Series 3700A mainframe backplane and an optional digital multimeter (DMM) through the analog backplane connection relays.
  • Page 2: Card Installation

    Model 3723 High-Speed Multiplexer 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 3723 High-Speed Multiplexer 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 Model 3723 High-Speed Multiplexer 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: Connection Information

    Model 3723 High-Speed Multiplexer Card Instructions The revision level of a pseudocard is always returned as 00.00 a. You can query the slot attributes to determine the capabilities of the installed switching modules. For example, send the following query to determine if slot 1 supports 4-wire commonside ohms channels: print(slot[1].commonsideohms) Refer to the Series 3700A System Switch/Multimeter Reference Manual for more information about using queries at tek.com/keithley.
  • Page 6 Model 3723 High-Speed Multiplexer Card Instructions The following figure shows the Model 3723 D-sub connections in one-pole mode. Figure 4: Model 3723 D sub-connections 1-pole 077183600 October 2024...
  • Page 7 Model 3723 High-Speed Multiplexer Card Instructions Schematics You can operate the 3723 in two-pole or one-pole mode. The mode is set by the channel.setpole() command. The following figure provides a switching schematic for the Model 3723 in two-pole mode. In this figure, n represents the slot number.
  • Page 8 Model 3723 High-Speed Multiplexer Card Instructions The following figure provides a switching schematic for the Model 3723 in single-pole mode. Figure 6: Model 3723 schematic single-pole mode 077183600 October 2024...
  • Page 9 Model 3723 High-Speed Multiplexer Card Instructions Screw-terminal accessory The 3723-ST screw-terminal accessory is shown in the following figure. The figure indicates the terminals as high or low and the location of MUX1 and MUX2. Figure 7: Model 3723-ST Screw-Terminal Accessory 077183600 October 2024...
  • Page 10 Model 3723 High-Speed Multiplexer Card Instructions The 3723-ST-1 screw-terminal accessory has a chassis ground connection for connecting a cable shield, as shown in the following figure. Figure 8: Model 3723-ST-1 Screw-Terminal Accessory 077183600 October 2024...
  • Page 11 Model 3723 High-Speed Multiplexer 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. Avoid handling circuit board surfaces and terminal blocks. Contaminants from hands may degrade screw-terminal accessory performance.
  • Page 12 Model 3723 High-Speed Multiplexer 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 5). Figure 10: Routing and securing cables with ties 5.
  • Page 13 Model 3723 High-Speed Multiplexer Card Instructions 8. Fasten the two slotted captive screws (3). Figure 11: 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 14 Model 3723 High-Speed Multiplexer Card Instructions 2. Make sure that the mounting screws (1 in the following figure) on the installed plug-in card are secure. Figure 12: 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 15 Model 3723 High-Speed Multiplexer 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 16 Model 3723 High-Speed Multiplexer Card Instructions Pin number identification Pin number identification for the Model 3720-MTC-3 cables is shown in the following figure and table. Figure 15: Model 3720-MTC-3 connectors Connect drain wire to shield at both ends. Model 3720-MTC-3 pin number identification CONN 1 Color CONN 2...
  • Page 17 Model 3723 High-Speed Multiplexer Card Instructions CONN 1 Color CONN 2 CONN 1 Color CONN 2 White/black/green White/blue/violet White/black/blue White/blue/gray White/black/violet White/violet/gray White/black/gray White/black/brown/red White/brown/red White/black/brown/orange White/brown/orange White/black/brown/yellow White/brown/yellow White/black/brown/green White/brown/green White/black/brown/blue White/brown/blue White/black/brown/violet (spare) White/brown/violet Not connected White/brown/gray White/black/brown/gray White/red/orange White/black/red/yellow White/red/yellow...
  • Page 18 Model 3723 High-Speed Multiplexer Card Instructions 3723 interlock pin numbers The following table shows the interlock pin numbers for the 3723 switch card. Interlock circuit Interlock pins Backplane relays affected Other relays affected Multiplexer #1 76, 78 n911 through n916 Multiplexer #2 76, 78 n921 through n926...
  • Page 19 Model 3723 High-Speed Multiplexer Card Instructions Maximum power usage with 3700A cards The 3700A plug-in cards can switch many relays at once, which can take a substantial amount of system power. The maximum power available in the 3700A is limited on a per-slot and per-bank basis, as shown in the following table.
  • Page 20 Model 3723 High-Speed Multiplexer Card Instructions To determine how many relay operations can be performed, use the previous table to calculate the total power required by applying the following equation: + (N × P ) + (N × P Where: ▪...
  • Page 21 Model 3723 High-Speed Multiplexer Card Instructions Totals for each bank are calculated: Slot 1 Slot 2 Slot 3 Total Bank #1 power consumed = 4100 4100 + 4100 12300 Slot 4 Slot 5 Slot 6 Total Bank #2 power consumed = 4100 4100 + 4100...
  • Page 22 Model 3723 High-Speed Multiplexer Card Instructions Power budgeting example with all 3723 and 60 relays closed 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 1 3723 Slot 2...
  • Page 23 Model 3723 High-Speed Multiplexer Card Instructions This produces the following power consumption: × P × P Slot 1 power consumed = 2 × 100 1175 Slot 2 power consumed = 1350 2 × 100 1550 Slot 3 power consumed = 4 ×...
  • Page 24 Model 3723 High-Speed Multiplexer Card Instructions Channel Color Description OUTPUT1 CH10 CH11 CH12 CH13 CH14 CH15 CH16 CH17 CH18 CH19 077183600 October 2024...
  • Page 25 Model 3723 High-Speed Multiplexer Card Instructions Channel Color Description CH20 CH21 CH22 CH23 CH24 CH25 CH26 CH27 CH28 CH29 CH30 OUTPUT 2 CH31 CH32 CH33 CH34 CH35 CH36 CH37 CH38 CH39 CH40 077183600 October 2024...
  • Page 26 Model 3723 High-Speed Multiplexer Card Instructions Channel Color Description CH41 CH42 CH43 CH44 CH45 CH46 CH47 CH48 CH49 CH50 CH51 CH52 CH53 CH54 CH55 CH56 CH57 CH58 CH59 CH60 077183600 October 2024...
  • Page 27 Model 3723 High-Speed Multiplexer Card Instructions Model 3723 connection log - 120 channel Use this table record your 120-channel 3723 connection information. Channel Color Description OUTPUT 1 OUTPUT 2 CH10 CH11 CH12 CH13 CH14 CH15 CH16 CH17 CH18 CH19 CH20 CH21 CH22 CH23...
  • Page 28 Model 3723 High-Speed Multiplexer Card Instructions Channel Color Description CH25 CH26 CH27 CH28 CH29 CH30 CH31 CH32 CH33 CH34 CH35 CH36 CH37 CH38 CH39 CH40 CH41 CH42 CH43 CH44 CH45 CH46 CH47 CH48 CH49 CH50 CH51 CH52 077183600 October 2024...
  • Page 29 Model 3723 High-Speed Multiplexer Card Instructions Channel Color Description CH53 CH54 CH55 CH56 CH57 CH58 CH59 CH60 CH61 CH62 CH63 CH64 CH65 CH66 CH67 CH68 CH69 CH70 CH71 CH72 CH73 CH74 CH75 CH76 CH77 CH78 CH79 CH80 077183600 October 2024...
  • Page 30 Model 3723 High-Speed Multiplexer Card Instructions Channel Color Description CH81 CH82 CH83 CH84 CH85 CH86 CH87 CH88 CH89 CH90 CH91 CH92 CH93 CH94 CH95 CH96 CH97 CH98 CH99 CH100 CH101 CH102 CH103 CH104 CH105 CH106 CH107 CH108 077183600 October 2024...
  • Page 31 Model 3723 High-Speed Multiplexer Card Instructions Channel Color Description CH109 CH110 CH111 CH112 CH113 CH114 CH115 CH116 CH117 CH118 CH119 CH120 077183600 October 2024...
  • Page 32: 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 33 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.