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Model 7700, 7702, and 7703
Multiplexer Modules
User's Guide
PA-695 Rev. C / 8-03
A G R E A T E R M E A S U R E O F C O N F I D E N C E

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   Summary of Contents for Keithley 7702

  • Page 1 Model 7700, 7702, and 7703 Multiplexer Modules User’s Guide PA-695 Rev. C / 8-03 A G R E A T E R M E A S U R E O F C O N F I D E N C E...
  • Page 2: Limitation Of Warranty

    WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment. Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation.
  • Page 3: Safety Precautions

    Keithley products are designed for use with electrical signals that The instrument and accessories must be used in accordance with its are rated Measurement Category I and Measurement Category II, as specifications and operating instructions or the safety of the equip-...
  • Page 4 Keithley Instru- symbol on an instrument indicates that the user should re- ments. Standard fuses, with applicable national safety approvals, fer to the operating instructions located in the manual.
  • Page 5 7700 20-Channel Differential Multiplexer w/Automatic CJC GENERAL Card Input 20 CHANNELS: 20 channels of 2-pole relay input. All channels config- urable to 4-pole. 2 CHANNELS: 2 channels of current only input. Card Sense RELAY TYPE: Latching electromechanical. Cold junction ACTUATION TIME: <3ms. Ref x3 Channel 1 CAPABILITIES...
  • Page 6 7702 40-Channel Differential Multiplexer GENERAL 40 CHANNELS: 40 channels of 2-pole relay input. Card Input All channels configurable to 4-pole. 2 CHANNELS: 2 channels of current only input. RELAY TYPE: Latching electromechanical. Card Sense ACTUATION TIME: <3ms. CAPABILITIES Channel 1...
  • Page 7 7703 32-Channel High Speed Differential Multiplexer GENERAL 32 CHANNELS: 32 channels of 2-pole relay input. Card Input All channels configurable to 4-pole. RELAY TYPE: Reed. Card Sense ACTUATION TIME: <1ms. CAPABILITIES Channel 1 CHANNELS 1-32: Multiplex one of 32 2-pole or one of 16 4-pole signals into DMM.
  • Page 8: Operation

    Except for the number of available switching channels and channel number designations, operation of the Model 7702 is the same as operation for the Model 7700. Model 7700 operation is covered in Section 2 of the Models 2700, 2701, and 2750 User’s Manuals. Model 7702 operation is also covered in Section 2 of the Model 2790 Reference Manual and Section 3 of the Model 2790 User’s Manual.
  • Page 9: Model 7700 - Connections And Wiring

    • Two protected channels for current measurements (external shunts not required) • Built-in cold junction reference • Latching type relays (relays hold their position after power is removed) • Designed specifically for use with Keithley’s Models 2700, 2701, and 2750 Systems.
  • Page 10 Connection information WARNING The information in this section is intended for qualified service personnel. Do not attempt to perform this procedure unless qualified to do so. Do not exceed the maximum specifications for the Model 7700. Connections to DMM functions are provided through the card backplane connector. •...
  • Page 11: Wiring Procedure

    Wiring procedure WARNING The information in this section is intended for qualified service personnel. Do not attempt to perform this procedure unless qualified to do so. Use the following procedure to wire the Model 7700 module. Make all connections using correct wire size (up to 20 AWG). Also, make sure to add supplementary insulation around the harness for voltages above 42V peak (see Figure 3).
  • Page 12 Table 1 Connection log Model 7700 Channel Color Description AMPS COM INPUT SENSE CH10 CH11 CH12 CH13 CH14 CH15 CH16 CH17 CH18 CH19 CH20 AMPS21 AMPS22...
  • Page 13: Model 7702 - Connections And Wiring

    Use the following procedure to wire the Model 7702 module. Make all connections using correct wire size (up to 20 AWG). Also, make sure to add supplementary insulation around the harness for voltages above 42V peak (see Figure 5).
  • Page 14 Figure 4 Model 7702 Screw terminal channel designations CH10 CH14 CH12 CH16 CH18 CH13 CH17 CH11 CH15 CH19 CH20 TE122 TE121 CH21 CH40 CH22 CH26 CH39 CH28 CH30 CH32 CH24 CH34 CH36 CH38 CH23 CH25 CH27 CH29 CH35 CH37 CH31...
  • Page 15 Wire dressing — Model 7702 Cable tie (2 places) TE122 TE121 Supplementary Insulation Connection log Make a copy of Table 2 and affix it to the cover of the Model 7702. Use this to record connection information and channel descriptions as needed.
  • Page 16 Table 2 Connection log Model 7702 Channel Color Description Description Color Channel INPUT SENSE CH21 CH22 CH23 CH24 CH25 CH26 CH27 CH28 CH29 CH30 CH10 CH31 CH11 CH32 CH12 CH33 CH13 CH34 CH14 CH35 CH15 CH36 CH16 CH37 CH17 CH38...
  • Page 17: Model 7703 - Connections And Wiring

    • Temperature applications (RTD or thermistor) • High-speed non-latching reed relays (relays go to open state after power is removed or *RST) • Designed specifically for use with Keithley’s Models 2700, 2701, and 2750 Systems. NOTE The 50-pin D-Shell connector mates with Model 7788.
  • Page 18 CAUTION If both connectors (P1017 and P1016) are not used, install the extra Model 7788 50-pin D-shell as a plug on the open connector (see Figure 7). If the connector is left open, an electrical shock hazard may be present. Figure 7 Supplementary insulation and plugging an unused connector Install plug (unused...
  • Page 19 Connection log Make a copy of Table 4 and affix it to the cover of the Model 7703. Use this to record connection information and channel descriptions as needed. Table 4 Connection log Model 7703 Channel Color Description Description Color Channel INPUT SENSE...
  • Page 21 A G R E A T E R M E A S U R E O F C O N F I D E N C E Keithley Instruments, Inc. Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY (534-8453) • www.keithley.com •...

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