Viavi CAA06M, User Manual

Page: 47 / 96

DTF Testing
38
NOTE:
You can also tap Auto Scale( ) 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 Data Points, Interference Rejection, Windowing, Distance unit and Bias Tee.
1 Tap the Menu ( ) key on the side bar and tap General .
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. 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.
3 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.
4 To set the method of video filtering to display the trace, select the Windowing option from the following
choices: Rectangular , Blackman , Nominal Side , Low Side and Minimum Side .
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.
5 To change the display unit for distance, select the Unit option from the choices: Meter and Foot .
NOTE:
Setting your city and time zone automatically changes not only the date and time but also