Keysight 34921A - Page 53

52 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide
Low Frequency Multiplexer Modules 34925A 40/80-Channel Optically-Isolated FET Multiplexer
Bank 2
For orientation, the D-sub connector
end of the module is facing you.
Bank 1
Bank 2
34 35 36 37 38 39 40 41 42 43 44 45 46
47
48 49 50
GND 26H 26L 36H 36L 32H 32L 28H 28L 38H 38L 30H 30L
NC NC NC NC
37L
18 19
20
21
22
23 24 25 26 27 28 29 30 31 32 33
Reserved 31H 31L 27H 27L 37H 33H 33L 29H 29L 39H 39L 35H 35L Interlock 2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
23L Interlock 221H 21L 22H 22L 23H
COM
2H
COM
2L
24H 24L 34H 34L 25H 25L 40H 40L
50-Pin D-Sub
Male Connector
Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin
21H 1 26H 35 31H 19 36H 37 COM2 H 7
21L 2 26L 36 31L 20 36L 38 COM2 L 8
22H 3 27H 21 32H 39 37H 23 Interlock
2
17
22L 4 27L 22 32L 40 37L 24 Interlock
2
33
23H 5 28H 41 33H 25 38H 43 Reserved 18
23L 6 28L 42 33L 26 38L 44 GND 34
24H 9 29H 27 34H 11 39H 29 No
Connect
47
24L 10 29L 28 34L 12 39L 30 No
Connect
48
25H 13 30H 45 35H 31 40H 15 No
Connect
49
25L 14 30L 46 35L 32 40L 16 No
Connect
50
As a safety feature, interlock 2 pins (17 and 33) on Bank 2
must be shorted to enable the Bank 2 Analog Bus relays to
close. The optional 34925T-001 (for 2-wire) terminal block
shorts these pins for you. This feature protects inadvertent
routing of high voltages from the Analog Buses to the D-sub
connector of the module.
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