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–
To automatically set, toggle the Sweep Time soft key and select Auto.
–
To manually set, complete the following steps:
a.
b.
c.
Sweep mode
The default settings of the sweep mode are Continue and Normal to sweep continuously at a normal
speed 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
NOTE
Selecting Sweep Mode > Fast may reduce the measurement accuracy, but you can use
this fast sweep mode to identify the existence of interfering signals.
Gated sweep
You can configure the gated sweep settings with an internal or external trigger source. If you select
Gated Sweep Settings, you can view the signal in time domain.
Procedure
1.
Press the SWEEP hot key.
2.
Press the Gated Sweep Settings soft key.
3.
Optional. Adjust sweep time to allow enough time for a cycle by completing the following steps:
a.
Press the Zero Span Time soft key.
b.
Enter a value by using the numeric keys.
c.
Select the unit: Sec, mSec, or µSec.
4.
Set the period, if using the internal trigger source, by doing one of the following:
–
To select the preset period, complete the following steps:
a.
b.
–
To manually set the period, complete the following steps:
Press the Sweep Time soft key.
Enter a value by using the numeric keys.
Select the unit: Sec, mSec, or µSec.
The sweep time mode automatically changes to Manual.
HOLD
in red appears and the sweeping is paused.
HOLD
in red disappears and the sweeping resumes.
Toggle the Period soft key and select StdSignal.
Press the StdSignal soft key, and then select the period: GSM (4.615 ms), WCDMA
(10 ms), LTE (10 ms), EV-DO (5 ms), TD-SCDMA (5 ms), or WiMAX (10 ms).
Using Interference Analyzer
JD780A Series Analyzers
101
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