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106 L4400 User’s Guide
4 L4421A 40-Channel Armature Multiplexer
L4421A Simplified Schematic
This drawing shows the L4421A configured as two independent 20- channel
2- wire MUXes.
026
027
028
029
030
ABus2
DMM
(SENS)
ABus3
ABus4
931
923
913 914
924
922
912911
921
DMM
(MEAS)
L
001
002
003
004
005
H
L
006
007
008
009
010
H
L
011
012
013
014
015
L
H
016
017
018
019
020
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
LH
LH
LH
LH
LH
LHLH
LH
H
L
L
L
L
L
044
LH
H
LH
COM 2
Bank 2
Current
Bank 1
COM 1
Analog Buses
I
I
I
I
I
ABus1
NOTE: The three-digit number assigned to each switch represents the channel number.
NOTE:
Bank Relays: Armature latching
Analog Bus Relays: Armature non-latching
4-wire scanning
scanning