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Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
1-888-KEITHLEY
www.keithley.com
Introduction
This instruction sheet contains information about the Keithley Instruments Model Series 3700 Dual 1x30 FET
Multiplexer Card connector pins, safety precautions, and product specifications.
WARNING
The following information is intended for qualified service personnel. Do not make module
connections unless qualified to do so.
To prevent electric shock that could result in serious injury or death, adhere to the following
safety precautions:
Before removing or installing a switch module in the mainframe, make sure the mainframe is
turned off and disconnected from line power.
Before making or breaking connections, make sure the power is removed from all external
circuitry.
Do not connect signals that may exceed the maximum specifications of the model or
external wiring. Specifications for each circuit board are provided in the Series 3700 User's
Manual.
WARNING
All wiring must be rated for the maximum voltage in the system. For example, if 300V is
applied to the backplane connector, all module wiring must be rated for 300V.
Information related to reading, writing, and controlling channels, as well as scanning, can be found in the Series
3700 System Switch/Multimeter User's Manual. Detailed information about controlling the Series 3700 from a
remote interface can be found in the Series 3700 System Switch/Multimeter Reference Manual.
PA-980 Rev. A / July 2008
www.valuetronics.com
Model 3724 Dual 1x30 FET Multiplexer Card
Connection Instructions
1
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Summary of Contents for Keithley 3724
- Page 1 1-888-KEITHLEY www.keithley.com Introduction This instruction sheet contains information about the Keithley Instruments Model Series 3700 Dual 1x30 FET Multiplexer Card connector pins, safety precautions, and product specifications. WARNING The following information is intended for qualified service personnel. Do not make module connections unless qualified to do so.
- Page 2 1×60 two-pole multiplexer, or to enable card-to-card expansion for even larger configurations. Other features of the Model 3724 include its ability to be reconfigured to coordinated four-pole operation for additional measurement flexibility. Furthermore, the Model 3724 supports thermocouple-type temperature measurements with the Model 3724-ST (screw terminal) accessory, providing automatic cold junction compensation (CJC).
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Page 3: Measurement Considerations
(typically 58Ω versus a mechanical relay's nominal 2Ω). The Model 3724 card is specified for ranges 1KΩ or greater in 4-wire ohms mode. The 100Ω range can still be used in 4-wire mode, provided the measured value is less than approximately 50% of range. -
Page 4: Specifications
Model 3724 Dual 1x30 FET Multiplexer Card Specifications DUAL 1X30 MULTIPLEXER CARD MULTIPLEXER CONFIGURATION: Two independent 1x 30 2-pole Multiplexers. Banks can be connected together via relay creating a single 1 x 60 Multiplexer. Banks can be isolated from the backplane by relays. Card can be configured for 2 and 4 wire. - Page 5 Model 3724 Dual 1x30 FET Multiplexer Card GENERAL: ACTUATION TIME: <0.2ms TEMPERATURE ACCURACY USING Automatic CJC with 3724-ST accessory: 1ºC for J, K, T and E type (see mainframe specification for details) RELAY TYPE: Optically isolated FET RELAY DRIVE SCHEME: Direct INTERLOCK: Backplane relays disabled when interlock connection removed.
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Page 6: Accessories Available
Model 3724 Dual 1x30 FET Multiplexer Card Power Budget Information: Quiescent Power (milliwatts): 1150 Channel Relay Power (milliwatts) each: 20 Backplane Relay Power Consumption (milliwatts) each: 100 See Chapter 8 of the series 3700 user’s manual for more detailed information.
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