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Dual spectrogram
The Dual Spectrogram mode is useful to compare two spectrograms displayed simultaneously on the
screen.
Setting measure setup
Procedure
Configure test parameters as described in the "Configuring test parameters" on page 95.
1.
2.
Press the MEASURE SETUP hot key.
3.
Toggle the Active Window soft key and select Left or Right spectrogram to be set up.
4.
To set the amount of time between each trace measurement:
a.
Press the Time Interval soft key.
b.
Enter a value by using the numeric keys. You can also use the rotary knob.
c.
Press the Sec soft key.
5.
To set the time cursor on a specific trace position, complete the following steps:
a.
Toggle the Time Cursor soft key and select On.
b.
Turn the rotary knob to move the time cursor. You can also enter a value and then press the
Enter soft key.
NOTE
Enabling the time cursor puts the measurement on hold and you can make post-
processing analysis for each measurement over time using the time cursor.
6.
To start a new measurement, press the Reset/Restart soft key.
7.
Optional. Go to SAVE/LOAD > Save, and then select the save option from the choices available
for your measurement mode. See "Using save" on page 31 for more information.
Measurement example
Figure 29
Interference measurement in dual spectrogram view
Using Interference Analyzer
JD780A Series Analyzers
107
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