Agilent 34970A/34972A Data Acquisition / Switch Unit
Agilent 34970A/34972A Data Acquisition / Switch Unit
Agilent 34970A/34972A Data Acquisition / Switch Unit
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Chapter 5 Theory of Operation<br />
<strong>Switch</strong> Modules<br />
34901A<br />
Components in this discussion are located on the A1 circuit assembly<br />
(34901-66501).<br />
The control circuitry has four groupings of latches, relay drivers and<br />
relays. The three control lines (SEL_A, SEL_B, and SEL_C) from the<br />
module controller are divided into five control lines by the binary to octal<br />
converter U109.<br />
The row latch, U102, and column latches, U103 and U104, control the<br />
relays. The row drivers are divided into four groups of set and reset<br />
drivers. Each group of row drivers controls five relays. The column<br />
drivers operate as a pair. There are ten column drivers each controlling<br />
two relays. The analog bus backplane relays are non-latching.<br />
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