Keithley 3720 User Manual

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

Keithley 3720 Specifications

General

Brand	Keithley
Model	3720
Category	Multimeter
Language	English