Option 100 Fault Location and SRL 4-5
Making SRL Measurements
How to Make and Interpret SRL Measurements
Figure 4-1 Calibrate the Instrument for an SRL Measurement
Verifying the Calibration
After calibrating, it is important to verify that the calibration is good.
Always determine your system directivity and verify the quality of your
test lead cable after performing a calibration.
When verifying the calibration and the quality of your test lead cable,
you should look for a combination of good system directivity (<−50 dB,
but acceptable up to −40 dB) and small variations in peak amplitudes
(<10 dB) when the test lead cable is wiggled or moved.
Determine System Directivity.
1. Determine the system directivity by connecting the load standard to
the end of the test lead cable as shown in Figure 4-2. (Or, if your
reference plane is the analyzer's RF OUT (or PORT 1) test port,
connect the load directly to that front panel connector.)
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