Keysight 34921A - 34925 A Simplified Schematic for Two- or Four-Wire Mode

50 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide
Low Frequency Multiplexer Modules 34925A 40/80-Channel Optically-Isolated FET Multiplexer
34925A Simplified Schematic for Two- or Four-Wire Mode
This drawing shows two independent 20-channel 2-wire MUXes.
To change configuration modes, use the SYSTem:MODule:WIRE:MODE command
.
The three-digit number assigned to each switch represents the
channel number.
Bank relays: FET non-latching; Analog Bus relays: Armature
non-latching
026
027
028
029
030
031
032
033
034
035
036
037
038
039
040
021
022
023
024
025
001
002
003
004
005
006
007
008
009
010
011
012
013
014
015
016
017
018
019
020
H
L
H
L
H
L
H
L
ABus2
DMM
(SENS)
ABus3
ABus4
923
913 914
924922
912911
921
ABus1
DMM
(MEAS)
H
L
H
L
H
L
H
L
LH
LH
LHLHLHLH
LHLHLHLH
Bank 1
Bank 2
COM 1
COM 2
Analog Buses
Overvoltage Protection
(each channel)
100
H
L
51.1
11 11
100
Current-Limiting Circuitry
100
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