Technical data
126 Chapter 7
Stimulus Response Measurements (Option N8995A)
Distance to Fault
Stimulus Response Measurements
(Option N8995A)
NOTE Test signals can cause interference. When testing cables attached to
antennas, test signals are radiated. Verify that the signal used for the
test cannot cause interference to another antenna.
NOTE The Distance to Fault calibration for manual frequency range is the
same calibration as performed for the Return Loss. If you make the
calibration for either of these measurements, the calibration will apply
to the other measurement—and “Calibrated” will be displayed on the
screen for both.
The calibration remains valid until you power off the analyzer or
change the start or stop frequency.
The distance to fault calibration for the auto frequency range is unique,
however. It is not applicable to return loss or one port insertion loss, or
even to the manual frequency range method for distance to fault.
For distance to fault measurements, separate calibrations need to be
performed for each frequency range mode.
Step 1. Set the analyzer to the Stimulus/Response mode and select the
Distance to Fault measurement:
Press
Mode, Stimulus/Response, Distance to Fault.
Step 2. Preset the analyzer:
Press
Mode Preset, Meas, Distance to Fault.
Step 3. Select the cable type:
Press
Meas Setup, Cable Type.
If the cable being measured has an “RG” designation, such as RG-214,
select:
Cable Type (RG). Otherwise, select: Cable Type (BTS). Press, Select
Cable
. You will then be given a list of cable types to select. Use the knob
or step keys to highlight the correct cable type and press
Select.
Step 4. Set the frequency range to auto.
Press
FREQ Channel, Freq Range (Auto).
The start and stop frequencies are then automatically set by the start
and stop distances.
Step 5. Set the start and stop distances for the cable you are measuring. In this
example, the cable is approximately 23 feet.
Press
FREQ Channel, Start Distance, 0, ft [feet].
Press
FREQ Channel, Stop Distance, 30, ft [feet].
Step 6. Set the distance units: