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JD780A Series Analyzers
1.
Press the AMP/SCALE hard key.
2.
Toggle the External Offset soft key and select On.
3.
Enter a value by using the numeric keys.
4.
Press the dB soft key to complete the entry.
To turn the external offset off:
1.
Press the AMP/SCALE hard key.
2.
Toggle the External Offset soft key and select Off.
Setting average
You can set the number of measurements to be averaged for the trace presentation. A maximum of
100 times of averaging can be set. When the averaging reaches to your setting, a new measurement
value replaces the measurement value in sequence from the earliest.
Procedure
1.
Press the BW/AVG hard key.
2.
Press the Average soft key.
3.
Enter a value between 1 and 100 as needed by using the numeric keys.
4.
Press the Enter soft key.
Setting sweep mode
The default setting is Continue to sweep continuously for most on-going measurements. If you want to
hold the measurement or get a single sweep, you can change the sweep mode.
Procedure
To select the single sweep mode:
1.
Press the SWEEP hot key.
2.
Toggle the Sweep Mode soft key and select Single. You can also use the HOLD hot key.
The letter
3.
Optional. Press the Sweep Once soft key to get a new measurement.
To return to the continuous sweep mode:
1.
Toggle the Sweep Mode soft key and select Continue. You can also use the HOLD hot key.
The letter
Setting trigger source
You can set the trigger source option for your measurements.
Procedure
1.
Press the TRIGGER hot key.
2.
Select the trigger source option from the following choices:
128
HOLD
in red appears and the sweeping is paused.
HOLD
in red disappears and the sweeping resumes.
Using GSM/GPRS/EDGE Signal Analyzer
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