12 34980A Service Guide
2 Specifications
Multiplexer Module Specifications and Characteristics
[1]
DC or AC RMS voltage, channel-to-channel or channel-to-earth
[2]
Peak voltage, channel-to-channel or channel-to-earth
[3]
Into analog bus. System errors are included in the internal DMM measurement accuracy specifications.
[4]
With in-rush resistors bypassed. Bypassing resistors reduces lifetime of relays. See the rated load relay life characteristics.
[5]
Limited to 6 W of channel resistance power loss per module
[6]
DC or peak AC current
[7]
Ambient temperature < 30 °C
[8]
Includes 0.5 °C temperature reference sensor and 0.5 °C terminal block isothermal gradient error. Measured under worst case
loading of the mainframe. See 34980A User's Guide for information on supported external reference sensors.
[9]
With 100 input protection resistors.
34921A 34922A 34923A 34924A 34925A
Channels/configurations 40 2-wire
20 4-wire
4-current
1.5 A Fused
70 2-wire
35 4-wire
80 1-wire
40 2-wire
20 4-wire
70 2-wire
35 4-wire
80 1-wire
40 2-wire
20 4-wire
Switch type Armature
latching
Armature
latching
Reed Reed
Optically
isolated FET
Input characteristics (per channel)
Max volts ± 300 V
[1]
± 300 V
[1]
± 150 V peak
[2]
± 150 V peak
[2]
± 80 V peak
[2]
Max current (DC, AC RMS)
Switch current
Carry current
1 A
2 A
1 A
2 A
0.5 A
[4]
/0.05 A
[9]
1.5 A
[4]
/0.05 A
[9]
0.5 A
[5]
/0.05 A
[9]
1.5 A
[5]
/0.05 A
[9]
0.02 A
[6]
Power (W, VA)
[5]
60 W 60 W 10 W 10 W 1.6 W
Volt-Hertz limit 10
8
10
8
10
8
10
8
10
7
Initial closed channel res
[3][10]
< 1.5 < 1.5 < 1.5
5
/200
9
< 1.5
5
/200
9
< 700
General specifications
Offset voltage
[3]
< 3 V< 3 V < 50 V
< 100
V 1-wire
< 50 V< 3 V
DC Isolation (ch-ch, ch-earth) >10 G >10 G >10 G >10 G >10 G
Leakage current
[3]
N/A N/A N/A N/A 20 nA
[7]
T/C cold junction accuracy
[3, 8]
< 1 °C N/A N/A N/A N/A
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