KEITHLEY 3721 Dual 1×20 Multiplexer Card

Multiplexer Configuration:

Two independent 1×20 2-pole multiplexers

Banks can be connected together via relay creating a single 1×40 multiplexer

Banks can be isolated from the backplane by relays

Card can be configured for common side Ohms measurement via backplane relays.

Channel 41–42: Multiplex one of two 2-pole current signals into DMM.

Contact Configuration 2-pole form A.

Connector Type: Two 50-pin male D-shells. Removable screw terminal option.

Maximum Signal Level:

Channels 1–40: 300 V DC or RMS, 2 A switched (3 A carry), 60 Ω, 125 VA maximum.

Channels 41–42: 60 V DC or 30V rms, 3 A switched, 60 Ω, 125 VA maximum. Fused 3 A, 250 V rms.

Common Mode Voltage: Channels 1–40: 300V DC or rms between any terminal and chassis.

Volt-Hertz Limit: 8×10^7

Contact Life >105 operations at maximum signal level. >108 operations no load.1

Typical Scanning Speeds

Switch Only: Sequential scanning, single channel, immediate trigger advance >120 ch/s.

With Measurements Into Memory

DCV (10 V range) or 2W Ohms (1 kΩ range): >110 ch/s.

Thermocouple: >110 ch/s.

3- or 4-Wire RTD: >100 ch/s.

4-Wire Ohms (1 kΩ range): >100 ch/s.

Datasheet