34902A
Components in this discussion are located on the A1 circuit assembly
(34902-66501). The schematics are included in Chapter 8 starting on
page 245.
The control circuitry has of two groupings of latches, relay drivers
and relays. The 16 voltage and resistance measurement channels are
directly driven. Tree switching controls the 2-wire/4-wire Ohms
operation and connections to the analog bus.
The reed relays are non-latching and the relay driver and +5R is
applied while a channel is closed.
Chapter 5 Theory of Operation
Switch Modules
144
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