Setting Trace; Conducting Rf Measurements; Channel Power - JDS Uniphase CellAdvisor JD780A Series User Manual

Setting trace

You can display up to six traces on the measurement chart simultaneously.
Procedure
1.
Press the TRACE/DISPLAY hard key.
2.
Press the Select Trace soft key, and then select the trace number: T1, T2, T3, T4, T5, or T6.
The legend shape of the selected trace changes from square to round to indicate that the trace is
the active one now.
3.
Do one of the following:
To
Clear current data and display with new
measurements
Display the input signal's maximum response only
(unlimited or for a certain amount of time)
Display the input signal's minimum response only
(unlimited or for a certain amount of time)
Capture the selected trace and compare traces
Load a saved trace
Hide the selected trace
Remove all the traces and initialize the trace
settings
NOTE
For the Max Hold and Min Hold, your instrument compares newly acquired data with the
active trace and displays larger maximum values or smaller minimum values on the
screen. You can set it to Unlimited to hold and view maximum or minimum data or
specify a certain amount of time up to 60 seconds by using numeric keys or the rotary
knob.
4.
Optional. Press the More (1/2) > Trace Info soft key, and then select the trace number to view
the trace's parameter setting information stored at the time of the measurement or None to hide
the information display.
5.
Optional. If you have the two traces T1 and T2, you can perform trace math. To view the power
difference between the traces, press the T1 – T2 -> T5 or T2 – T1 -> T6 soft key.
The result is overlaid on the screen along with the second Y-axis.

Conducting RF measurements

Channel power

The Channel Power measurement determines the average power of an RF signal burst at or above a
specified threshold value.
The purpose of the Channel Power measurement is to determine the power delivered to the antenna
system on the RF channel under test. The instrument acquires a TD-SCDMA signal in the time domain.
The average power level above the threshold is then computed and displayed.
Using TD-SCDMA Signal Analyzer
JD780A Series Analyzers
Select Trace Legend
Clear Write W
Max Hold M
Min Hold m
Capture C
More (1/2) > Load L
Trace View > Off F
More (1/2) > Trace
Clear All
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