HP 70000 series, Руководство пользователя

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SAVE USERKEY
Functional Type:
memory-related and instrument-state
Firmkey A ccess:
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Traces
Preset State:
O
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select adc
switches between the internal and external video-processing paths .
The
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select adc softkey accesses a menu that chooses the available analog-to-digital
converters in your system. T o select a dierent converter , press
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select adc , then make
a selection by pressing one of the listed softkeys . The modules are displayed in a sequence
that is dependent on the HP-MSIB address of each converter module . Use the digitizer
analog-to-digital converter to obtain faster sweep times when the spectrum analyzer frequency
span is zero .
During normal operation, the video signal is routed to the analog-to-digital converter (ADC) in
the HP 70900B local oscillator source for processing.
If the analyzer system contains an analog-to-digital converter module in addition to an
HP 70900B local oscillator source , the
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select adc softkey is present. Use
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select adc to
route the video signal to the desired converter , such as an HP 70700A digitizer . When an
HP 70700A digitizer is used for this purpose , it must be under the control of the local oscillator
module .
See HP 70000 Modular Spectrum Analyzer Installation and V erication Manual for
conguration instructions .
Functional Type:
signal-path
Firmkey A ccess:
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State
Preset State:
Not aected by 4
IP
5 .
4-144 Softkey Descriptions