HP 8112A Operating, Programming And Servicing Manual page 193
50 mhz programmable pulse generator
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- Operating, programming and servicing manual (112 pages) ,
- Operating, programming and servicing manual (406 pages)
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Power-down Detection
U2A is used to detect the power being switched off. Normally
its output is negative because its inverting input is at a higher
potential (5.1 V) than its non-inverting input (5 V). When the
HP 8 1 1 2A is switched off, the 5 . 1 V supply breaks down faster
than the 5 V reference because it is loaded by the microprocessor
board. This is detected by U2A which switches its output towards
its positive supply. This "Power Down Detected" signal is used
on the microprocessor board to ensure that the microprocessor
and HP-IB switch off cleanly. Refer to Chapter 10.7
Microprocessor.
Servicing the
Servicing the Power Supply 10.2-3
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