Theory of Operation 5
Keysight 34970A/34972A Service Guide 155
34903A
Components in this discussion are located on the A1 circuit assembly
(34903-66501).
The control circuitry has two grouping of latches, relay drivers and relays. The 20
channels are, for control purposes, arranged into 8 rows by 10 columns.
The row latch, U102, and column latches, U103 and U104, control the relays. The
row drivers are divided into four groups of set and reset drivers. Each group of row
drivers controls five relays. The column drivers operate as a pair. There are ten
column drivers each controlling two relays.
The 34903A provides 20 channels of Form C switching.
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