JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

Страница: 161 / 592

JD780A Series Analyzers
Using WCDMA/HSPA+ Signal Analyzer
161
the active one now.
3.
Do one of the following:
To Select Trace Legend
Clear current data and display with new
measurements Clear Write W
Display the input signal
’s maximum response only
(unlimited or for a certain amount of time)
Max Hold M
Display the input signal
’s minimum response only
(unlimited or for a certain amount of time)
Min Hold m
Capture the selected trace and compare traces Capture C
Load a saved trace More (1/2) > Load L
Hide the selected trace Trace View > Off F
Remove all the traces and initialize the trace
settings More (1/2) > Trace
Clear All
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.
To select the detection option, press the More (1/2) > Detectors , and then do one of the
following:
To display Select
Random noise better than the peak without missing signals Normal
The highest value in each data point Peak
The root mean squared average power across the spectrum RMS
The lowest value in each data point Negative Peak
The center value in each data point Sample
5.
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.
6.
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 is a common test used in the wireless industry to measure the total
transmitted power of a radio within a defined frequency channel. This procedure measures the total
power within the defined channel for WCDMA. This measurement is applied to design, characterize,
evaluate, and verify transmitters and their components or devices for base stations and mobile stations.
The channel power measurement identifies the channel power within a specified bandwidth (default is