Features and Functions
3
Keysight 34980A Mainframe User’s Guide
123
Measurement Functions
The following table shows which DMM measurement functions are supported by
each of the multiplexer modules.
Note that similar considerations must be taken into account on the 34931A,
34932A, and 34933A matrix modules. Since the matrix modules cannot be
incorporated into a scan list, you must use the Stand-Alone DMM Mode for these
modules.
[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
μ
V) must be taken into consideration.
[e] 1 k
Ω
or higher range used unless 100
Ω
series resistors are bypassed on module.
[f] 10 k
Ω
or higher range used for loads over approximately 300
Ω
due to series resistance of FET channels.
Measurement
Function(s)
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
No
No
No
No
No
No
Frequency/Period
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Ohms 2-Wire
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Ohms 4-Wire
Yes
Yes
Yes
5
No
Yes
Yes
No
Thermocouple
Yes
Yes
Yes
Yes
Yes
Yes
Yes
RTD 2-Wire
Yes
Yes
Yes
Yes
Yes
No
No
RTD 4-Wire
Yes
Yes
Yes
No
Yes
Yes
No
Thermistor
Yes
Yes
Yes
Yes
Yes
No
No
