HP HP 8753E, User Manual, Page: 398 / 699

Knowing the Instrument Modes
There are five major instrument modes of the analyzer:
network analyzer mode
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external source mode
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tuned receiver mode
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frequency offset operation
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harmonic mode operation (Option 002)
Network Analyzer Mode
This is the standard mode of operation for the analyzer, and is active after you press or
switch on the AC power.
This mode uses the analyzer’s internal source.
External Source Mode
This mode allows the analyzer to phase lock to an external CW signal. External source mode is
best used for unknown signals, or for signals that drift. If a synthesized external source is used,
the tuned receiver mode is recommended because it is faster.
Primary Applications
External source mode is useful in several applications:
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when your test device is a mixer or other frequency translation device
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in automated test applications where a source is already connected to the system, and you do
not want to switch between the system source and the analyzer’s internal source.
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