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Chapter 10 2-Port Transmission Testing
3
General parameters
You can set parameters for Data Points, Interference Rejection, Bias Tee, Output Power, and
Average.
Procedure
1
2
3
4
5
6
90
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 -100 to 100 dB.
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 and the limit.
Press the SETUP hard key and touch the General tab.
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.
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 DUT's loss if it 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
requires you to perform a new calibration.
To set the number of measurements to be averaged, complete the following steps:
a
Select the input box next to the Average.
b
Enter a value between one and five.
To enable the Interference Rejection feature, select On.
NOTE
Default setting is Off. It is recommended to use this feature only when you suspect
interfering signals in the area as it slows down measurement.
For JD725C and JD726C users with the option 001 Bias Tee installed. To use the Bias Tee,
CellAdvisor JD720C User's Manual
hard key any time you need to view the
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