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