HP 8753D Option 011 Service Manual page 255

Analog Bus
To access the analog bus, press SYSTEM
escription of the Analog Bus
The analog bus is a single multiplexed line that networks 31 nodes within the instrument.
It can be controlled from the front panel, or through HP-IB, to make voltage and frequency
measurements just like a voltmeter, oscilloscope, or frequency counter. The next few
paragraphs provide general information about the structure and operation of the analog
bus. ee \Analog Bus Nodes," below, for a description of each individual node. Refer to the
\Overall Block Diagram," in the \ tart Troubleshooting" chapter, to see where the nodes are
located in the instrument.
The analog bus consists of a source section and a receiver section. The source can be the
following:
any one of the 31 nodes described in \Analog Bus Nodes"
the A14 fractional-N VCO
the A14 fractional-N VCO divided down to 100 kHz
The receiver portion can be the following:
the main ADC
the frequency counter
When analog bus traces are displayed, frequency is the x-axis. For a linear x-axis in time,
switch to CW time mode (or sweep a single band).
The Main A C
The main ADC is located on the A10 digital IF assembly and makes voltage measurements in
two ranges. ee \
RESOLU ION
10-16 Service Key Menus and Error Messages
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SERVICE MENU ANALOG BUS ON
5
," under \Analog In Menu."
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RAFT
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