Agilent Technologies 89410A User Manual

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
], [
receiver
], then press:
89410A: [
input section (0-10 MHz)
].
89441A: [
RF section (0-10 MHz)
].
Press [
Preset
].
Press [
Instrument Mode
], [
vector
].
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
], [
default disk
], [
internal disk
].
Press [
Return
], [
catalog on].
Rot ate the knob to highlight PI4DQPSK.DAT
Press [
recall trace
], [
from file into D1
], [
enter
].
Press [
Source
], [
source on], [source type
], [
arbitrary
].
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] softkey.
4. Select a center frequency and span:
Press [
Frequency
], [
center
], 5, [
MHz
]
Press [
span
], 100, [
kHz
].
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.
Using Digital Demodulation (Opt. AYA)
8 - 2

Agilent Technologies 89410A Specifications

General

Brand	Agilent Technologies
Model	89410A
Category	Measuring Instruments
Language	English