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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 the DTF mode is 1 to 65 in VSWR and -60 to 0 dB in Return Loss.
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 Windowing, Data Points, Distance Unit, and Interference
Rejection.
Procedure
1
Press the SETUP hard key and touch the General tab.
2
To set the method of video filtering to display the trace, select the Windowing option from the
following choices:
–
Rectangular
–
Blackman
–
NSL (Nominal Side Lobe)
–
LSL (Low Side Lobe)
–
MSL (Minimum Side Lobe)
NOTE
If the video filtering is activated by selecting a different type of Windowing filters,
Rectangular or Blackman, the overshoots of the trace are reduced by smoothing out
the sharp transitions so that you can easily discriminate noises and peaks. For
example, if you select the Blackman, noises around peaks are reduced and it helps
you verify a DTF location clearly.
3
To set the measurement resolution, select the Data Points option from the choices: 126, 251,
501, 1001, and 2001.
NOTE
Default setting is 1001. The larger number you choose, the lower resolution you get
even though you can have longer Max Distance to measure. Changing data points
does not affect calibration status.
4
To change the display unit for distance, select the Units option from the choices: Meter and Foot.
NOTE
Setting your city and time zone automatically changes not only the date and time but
also the distance unit in the DTF settings accordingly to Meter or Foot.
CellAdvisor JD720C Series User's Manual
hard key any time you need to view the
Chapter 6 DTF Testing
57
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