Chapter 8 Measure Mode – Basic Tab
FDR
DSAM Help User Guide Rev. 001 181
2 Connect the LST-1700 to the DSAM using one of the following
cables:
– Part Number 1217-00-0251C (for DSAM with standard
battery)
– Part Number 21103805 (for DSAM with high capacity battery)
3 Apply power to both devices.
4 Press Measure.
5 Press the Basic softkey.
6 Using the arrow keys, select FDR.
7 Press ENTER.
8 Using the arrow keys, position the distance marker over a reflec-
tion to pinpoint its distance and amplitude. (The corresponding
information is displayed directly below the graph.)
Understanding
FDR Results
The FDR graphs distance on the X-axis and amplitude on the Y-axis
as the LST-1700 transmits signals down the cable and looks for RF
energy being reflected back. Reflections occur when there is a change
in impedance possibly caused by such things as cable damage, un-
terminated ports, or improper installation.
Figure 165 Measure Mode – Basic Tab: FDR
N
NOTE
To save the results to a file, refer to “Saving Results” on page 198.
21128026 R001 DSAM Help User Guide.book Page 181 Thursday, February 5, 2009 2:02 PM