To Prepare A Vsb Measurement - Agilent Technologies 89410A Operator's Manual

Using Video Demodulation
(Opt. AYH)

To prepare a VSB measurement

This task shows you how to load and view the 8 VSB signal located on the
Signals Disk. If you have your own 8 VSB signal, use the steps below and
enter the demodulation parameters for your signal.
1.
Initialize the analyzer:
Press [ ], [
Instrument Mode
89410A: [
input section (0-10 MHz)
89441A: [
RF section (0-10 MHz)
Press [ ].
Preset
Press [
Instrument Mode
Press [ ], [
System Utility
2.
Supply an 8 VSB signal to the channel 1 INPUT or perform the following steps
to load an 8 VSB signal from the Signals Disk into the analyzer's time-capture
RAM:
Insert the Signals Disk into the internal disk drive.
Press [ ], [
Save/Recall
Press [ ], [
Return catalog on
Rotate the knob to highlight 8VSB.CAP
], [
Press [
recall more recall capture buffer
3.
Turn on averaging:
Press [ ] [
Average average on]
4.
Measure and scale the displayed trace:
Press [
Measurement Restart
When you measure time-capture data, the analyzer automatically sets its
frequency span and center frequency to that used to capture the data.
Therefore, you did not need to set these parameters in the above steps.
If you are not measuring time-capture data, you must set the center
frequency, frequency span, and range. If these parameters are incorrect,
the analyzer may not lock to your carrier, measurement speed may be
reduced, or you may see excessive errors in the demodulated results. For
details about setting these parameters, see ''Carrier locking'', ''Input Range'',
and ''Span considerations'' in the Video Demodulation Concepts chapter.
The next task, ''To determine the center frequency for a VSB signal.'',
shows you how to determine the correct center frequency.
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vector
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memory usage configure meas memory)
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default disk internal disk
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enter
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Auto Scale
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max time pts