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Procedure
1
Press the SETUP hard key and touch the Amplitude tab.
2
Do one of the following:
–
To set the Top and Bottom amplitudes manually, complete the following steps:
a
Select the cell next to the Top.
b
Enter a value by using the numeric keys or the rotary knob.
The entered value becomes the maximum value for the Y-scale.
c
Select the cell next to the Bottom.
d
Enter a value by using the numeric keys or the rotary knob.
The entered value becomes the minimum value for the Y-scale.
–
To restore the instrument's default range for the Y-scale, tap the Full Scale button.
The amplitude range for this measurement mode is -180 to 180 Degree.
3
Tap the Apply button in the lower-right corner of the setup screen to save the change(s).
NOTE
You can also press the AUTO SCALE
entire trace on the measurement chart. The instrument automatically optimizes the
maximum and minimum values of the Y-scale to display the entire trace.
General parameters
You can select options for Data Points and Interference Rejection.
Procedure
1
Press the SETUP hard key and touch the General tab.
2
To set the measurement resolution, select the Data Points option from the choices: 126, 251,
501, 1001, and 2001.
NOTE
Default setting is 1001. It is recommended that you select high resolution data points
only for an instance of measuring wide frequency bands or requiring precise
measurement data.
The larger number you choose, the higher resolution you get and the longer the
instrument takes to sweep and display results. For example, selecting 501 data points
provides twice as many measurement points as 251, but it may take twice longer to
sweep and display the trace than choosing 251 data points. Changing data points
does not affect calibration status.
3
To set the level of the output power to be inserted, select the Output Power option from the
following choices:
–
0 dBm: To test your your DUT's loss if it is a passive RF device such as cable or filter.
–
-30 dBm: To test your DUT's gain if it is an active RF device such as amplifier.
NOTE
Default setting is 0 dBm. The output power -30 dBm may reduce measurement
dynamic range.
Changing the output power level after calibration affects the calibration status and it
CellAdvisor JD720C Series User's Manual
Chapter 11 2-Port Phase Testing
hard key any time you need to view the
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