Model 3721 Dual 1X20 Multiplexer Card; Available Accessories: Model 3721 - Keithley 3720 User Manual

Series 3700 System Switch/Multimeter User's Manual

Model 3721 dual 1x20 multiplexer card

The Model 3721 provides 40 differential channels and automatic CJC with 3721-ST accessory.
The Model 3721 has two independent banks of 1x20 two-pole multiplexers that are ideal for
general-purpose switching, including temperature measurements.
The Model 3721 provides a number of other features. In addition to the 40 channels, two fused
channels are supplied for current measurements. Also, the Model 3721 includes dedicated
inputs that enable 40 channels of four-wire common side ohm measurements. For
thermocouple-type measurements, automatic cold junction compensation (CJC) is supported
with the Model 3721-ST (screw terminal) accessory.
The Model 3721 uses two 50-pin male D-sub connectors for signal connections. For screw
terminal or automatic CJC, use the detachable Model 3721-ST accessory.
Figure 9-6: Model 3721

Available accessories: Model 3721

3721-MTC-1.5:
3721-MTC-3:
3721-ST:
3790-KIT50-R:
7401:
Document Number: 3700S-900-01 Rev. A / August 2007
50-pin female-to-male D-sub cable assembly, 1.5m (4.9ft)
50-pin female-to-male D-sub cable assembly, 3m (9.8ft)
Screw terminal panel with CJC sensor
50-pin female D-sub connector kit (solder cup contacts). See
information: Model 3721.
Type K thermocouple wire kit
Section 9: Series 3700 Module Schematics and Connections
(see "Connection information: Model 3721" on page 9-15)
Connection
9-13