User`s guide

8
34980A multiplexer
switch modules
The 34980A multiplexer modules can be
used to connect one of many different
points to a single point. You can connect
to an external instrument, or scan mul-
tiple analog signals to the internal DMM.
Choose from the following features:
• 1-wire,2-wire,or4-wire
configurations
• Highvoltage—upto300V,1A
• Highdensity—702-wireor
80 1-wire channels
• Scanupto1000ch/secwiththe
34925A
• Bandwidthsupto45MHz
• Temperaturemeasurementswithbuilt-
in thermocouple reference junction
(34921T)
• ACorDCcurrentmeasurementswithout
external shunts
• Flexibleconnectionsviastandard
50-or78-pinDsubcablesordetachable
terminal blocks
Figure 4. 34921A 40-channel armature multiplexer with low thermal offset (bank 2)
Voltage Current Freq/ Ω 2-Wire Ω 4-Wire Thermo- RTD RTD Thermistor
AC/DC AC/DC Period couple 2-Wire 4-Wire
34921A Armature Multiplexer Yes Yes Yes Yes Yes Yes Yes Yes Yes
34922AArmatureMultiplexer Yes No Yes Yes Yes Yes Yes Yes Yes
34923AReedMultiplexer(2-wire) Yes No Yes Yes Yes Yes Yes Yes Yes
34923AReedMultiplexer(1-wire) Yes No Yes Yes No Yes Yes No Yes
34924AReedMultiplexer Yes No Yes Yes Yes Yes Yes Yes Yes
34925AFETMultiplexer(2-wire) Yes No Yes Yes Yes Yes No Yes No
34925AFETMultiplexer(1-wire) Yes No Yes Yes No Yes No No No
Note: See User’s Guide for additional information.
Table 2. Multiplexer measurement functions
026
027
028
029
030
ABus2
DMM
(SENS)
ABus3
ABus4
931
923
924 922 921
DMM
(MEAS)
L
021
022
023
024
025
H
L
031
032
033
034
035
036
037
038
039
040
L
H
L
H
L
Current
Fuse
Fuse
Fuse
Fuse
042
043
041
L H
L H
L H
L H
L H
L H L H
L H
L
L
L
L
044
L H
H
COM 2
Bank 2
Current
Analog Buses
I
I
I
I
I
ABus1