4-6 Option 100 Fault Location and SRL
Making SRL Measurements
How to Make and Interpret SRL Measurements
Figure 4-2 Connect the Load
2. Observe the magnitude of the response on measurement channel 1.
See Figure 4-3 for an example response. The highest peak response
on channel 1 is the system directivity. If the peak response on channel
1 is <−50 dB, the calibration is good. If the peak response is >−40 dB,
you should recalibrate the analyzer.
NOTE Measurement quality is related to system directivity. For the highest
quality measurements, system directivity should be <−50 dB, but
measurement quality is acceptable up to −40 dB. See “SRL Measurement
Uncertainty vs System Directivity” on page 9-4.
Also see “Measurement Uncertainties” on page 1-18.
Figure 4-3 Determine System Directivity
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