![JDS Uniphase CellAdvisor JD720C Series Скачать руководство пользователя страница 57](http://html1.mh-extra.com/html/jds-uniphase/celladvisor-jd720c-series/celladvisor-jd720c-series_user-manual_3625723057.webp)
Chapter 6 DTF Testing
CellAdvisor JD720C Series User
’s Manual
57
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
hard key any time you need to view the
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.