4-4 Option 100 Fault Location and SRL
Making SRL Measurements
How to Make and Interpret SRL Measurements
2. Calibrate the Analyzer
When practical, a calibration should be done at the measurement
reference plane using open, short, and load calibration standards. If
calibration standards are not available, the default instrument
calibration can be used.
NOTE Most SRL measurements are made using a test lead cable. If this is the
case, the measurement reference plane would be the end of the test lead
cable as shown in Figure 4-1. If you will be testing cables by connecting
them directly to the analyzer's RF OUT (or PORT 1) test port, you should
perform the calibration at the analyzer's port as shown in Figure 3-1 on
page 3-8.
Using Calibration Standards to Calibrate the
Instrument
This calibration will correct for directivity, source match, and frequency
response errors. Refer to “SRL Measurement Uncertainty vs System
Directivity” on page 9-4 for more information.
To calibrate the instrument using calibration standards, perform the
following steps:
1. If SRL is already selected as the type of measurement, press
.
2. Follow the prompts on the analyzer's screen to connect the open,
short and load to the measurement reference plane. (See Figure 4-1.)
3. After the calibration is complete, a C is displayed in the measurement
channel annotation area in the upper right-hand corner of the
analyzer's display. The C indicator is a visual verification that a full
band (not instrument default) calibration is in use and has been
completed properly.
NOTE A full band calibration is valid over the entire frequency range of the
analyzer and is valid for any frequency setting.
CAL
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