Option 100 Fault Location and SRL 4-13
Making SRL Measurements
How to Make and Interpret SRL Measurements
Connector Model for Short Cables
1. Turn off the connector fault display by pressing
.
2. If you are measuring a short cable, or if you have very large
mismatches in the cable under test, you may need to manually set the
(L) and (C).
3. Observe the SRL measurement trace while adjusting the connector
length and C values for the best (lowest overall) response.
4. Some cables may be best measured by adjusting only the connector
length, other cables may require a connector C adjustment, and some
others may require a combination of connector length and C values.
NOTE When manually adjusting the connector length or connector C values, be
sure to wait for the analyzer to complete a sweep and update the display
before trying another value.
5. Use to compensate for cables with large variations from
the average cable impedance.
6. You may need to measure the connector using a Smith chart to get the
best connector model:
Press to observe the SRL response.
Observe the display while adjusting the connector C and connector
length parameters. The best response is obtained when the Smith
chart response has been most compacted by the connector C and
connector length adjustments.
7. Figure 4-8 shows a typical SRL measurement response with a
properly adjusted connector model. Compare this response to the
sloping response of Figure 4-6.
DISPLAY
MEAS 2
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