102 34980A Service Guide
4 Troubleshooting and Diagnostics
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.
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