Low Frequency Multiplexer Switch Modules 4
34980A User’s Guide 121
Measurement Functions for the MUX Modules
The MUX modules support the DMM measurement functions as shown in
the following table.
Function
34921A
40-Ch Arm
MUX
34922A
70-Ch Arm
MUX
34923A
40-Ch Reed
MUX
(2-Wire)
34923A
80-Ch Reed
MUX
(1-Wire)
34924A
70-Ch Reed
MUX
34925A
40-Ch FET
MUX
(2-Wire)
34925A
80-Ch FET
MUX
(1-Wire)
Voltage, AC/DC Yes Yes Yes Yes Yes Yes Yes
Current, AC/DC Yes
1
No No No No No No
Frequency/Period Yes Yes Yes Yes Yes Yes Yes
Ohms 2-Wire Yes Yes Yes
5
Yes
5
Yes
5
Yes
6
Yes
6
Ohms 4-Wire Yes Yes Yes
5
No Yes
5
Yes
6
No
Thermocouple Yes
2
Yes
3
Yes
3,4
Yes
3,4
Yes
3,4
Yes
3
Yes
3
RTD 2-Wire Yes Yes Yes
5
Yes
5
Yes
5
No No
RTD 4-Wire Yes Yes Yes
5
No Yes
5
Yes
6
No
Thermistor Yes Yes Yes
5
Yes
5
Yes
5
No No
1
Direct current measurements are allowed on channels 41 through 44 only (for all other channels, external shunts are required).
2
Optional 34921T Terminal Block is required for thermocouple measurements with built-in internal reference junction.
3
A fixed or external reference junction temperature is required for thermocouple measurement with this module.
4
Impact of higher offset voltage specification (< 50 µV) must be taken into consideration.
5
1 kΩ or higher range used unless 100Ω series resistors are bypassed on module.
6
10 kΩ or higher range used for loads over approximately 300Ω due to series resistance of FET channels.
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