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

Using Digital Demodulation (Opt. AYA)

To prepare a digital demodulation measurement

This task shows you one way to set up a digital demodulation
measurement. The task uses a NADC signal from the signals disk. Several
other tasks in this chapter use this setup to teach you how to use digital
demodulation.
1.
Initialize the analyzer:
Press [ ], [
Instrument Mode
89410A: [
input section (0-10 MHz)
89441A: [
RF section (0-10 MHz)
Press [ ].
Preset
Press [ ], [
Instrument Mode
2.
Supply a NADC signal to the channel 1 INPUT or perform the following steps to
load a NADC signal from the Signals Disk into a data register and play it
through the analyzer's aribtrary source:
Insert the Signals Disk into the internal disk drive.
Connect the SOURCE to the channel 1 INPUT.
Press [ ], [
Save/Recall
Press [ ], [
Return catalog on
Rot ate the knob to highlight PI4DQPSK.DAT
], [
Press [
recall trace from file into D1
Press [ ], [
Source source on
3.
Select the optimum range:
Press [ ].
Range
Press the down-arrow key until the Channel-1 Over and Half LEDs are on.
Press the up arrow key one press at a time until the Over LED turns off.
For additional details about selecting the optimum range, see online help
for the [ ], [
Range ch1 range
4.
Select a center frequency and span:
Press [ ], [
Frequency center
Press [ ], 100, [
span
The center frequency tunes the analyzer to the carrier frequency. To
obtain reliable carrier lock, the center frequency must be close to the
carrier frequency. For details, see ''Carrier Locking'' in the Digital
Demodulation Concepts (Opt. AYA) chapter.
Selecting the correct frequency span is also important when using digital
demodulation. The span must be wide enough to include all signal
components, and yet not too wide, or the measurement may be affected
by excessive noise and slower speed. For details, see ''Span
considerations for digitally demodulationed measurements'' in the
Digital Demodulation Concepts (Opt. AYA) chapter.
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], then press:
receiver
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vector
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default disk internal disk
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.
], [ ].
enter
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], [
source type arbitrary
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], 5, [ ]
MHz
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kHz
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