4 Troubleshooting and Diagnostics
94 Keysight 34980A Service Guide
34925A 40/80-Channel Optically-Isolated FET Multiplexer
The 34925A 40/80-Channel Optically-Isolated FET Multiplexer (40/80-Ch FET
MUX) module is a high- speed and high-density FET MUX for high throughput
production test. This module is divided into two equal banks of non-latching FET
switches. This module also contains four armature Analog Bus relays. Through
ABus1 and ABus2 you can connect any of the channels to the internal DMM for
voltage or resistance measurements. When the power is off, all channel and
Analog Bus relays open.
Using program commands or the mainframe front panel, you can control each of
the FET channel switches individually, and configure this module for differential
(2-wire or 4-wire) or single- ended (1-wire) mode. Refer to the simplified 2-,
4-wire schematic below.
026 K402 061 K502
027 K404 062 K505
028 K406 063 K506
028 K407 064 K507
030 K409 065 K509
031 K402 066 K502
032 K401 067 K501
033 K404 068 K505
034 K406 069 K506
035 K406 070 K506
Backplane Backplane
911 K611 921 K621
912 K612 922 K622
913 K613 923 K623
914 K614 924 K624
Bank 1 Bank 2
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