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3721 CAL

Test Accessory, Multiplexer Card, Calibrated, Keithley 3700 & 3700A Series Mainframes

3721 CAL - Test Accessory, Multiplexer Card, Calibrated, Keithley 3700 & 3700A Series Mainframes

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Manufacturer Part No:
3721 CAL
Newark Part No.:
Technical Datasheet:
3721 CAL   Datasheet
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Product Information

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Dual 1 X 20 Multiplexer Card

Keithley 3700A Series Mainframes


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Technical Docs (1)

Product Overview

The 3721 CAL from Keithley is a dual 1 x 20 multiplexer card for series 3700A mainframes. It offers two independent banks of 1 x 20 two pole multiplexers that are 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 analogue backplane connection relays. This connection to reconfigure the model 3721 as a single 1 x 40 two pole multiplexer or to enable card to card expansion for even larger configurations. In addition to the 40 channels, two fused channels are supplied for current measurements. Also, this model includes dedicated inputs that enable 40 channels of four wire common side ohms measurements. For thermocouple type measurements, automatic cold junction compensation (CJC) is supported when used with the model 3721-ST accessory. The 3721 uses two 50 pin male D-sub connectors for signal connections.
  • Calibrated multiplexer card
  • Relay closures automatically counted and stored in each card’s onboard memory
  • 40 two pole or 20 four pole channels for general purpose switching
  • Latching electromechanical relays, direct relay drive scheme, 2 form A contact configuration
  • 4ms actuation time, 1°C for J, K, T and E type temperature accuracy using automatic CJC with 3721-ST
  • 300V/2A (ch 1 to 40), 60V/3A (ch 41 to 42) maximum voltage/maximum current switched
  • Channel resistance (end of contact life) is < 1ohm (dual 1 x 20), < 1.5ohm (single 1 x 40)
  • Analogue backplane connection relays provide easy bank and card interconnections
  • 2 dedicated channels for current measurements, 3A capacity
  • 0° to 50°C operating temperature range, 2.25lbs weight

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