Technical data

100 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.