4-16 Option 100 Fault Location and SRL
Making SRL Measurements
How to Make and Interpret SRL Measurements
5. Perform the SRL Cable Scan
Once the connector model has been established for the best response, the
cable should be scanned at narrow frequency resolution to look for
narrow response spikes that are characteristic of periodic defects in the
cable. The SRL cable scan is required to determine the cable's SRL with
125 kHz resolution.
By taking five sweeps of 1601 points each at slightly different frequency
ranges (see Table 4-3 on page 4-17), the analyzer can obtain 8005 distinct
frequency points to achieve the desired frequency resolution of 125 kHz.
The resolution of the SRL measurement is determined by the following
formula:
where N is the number of measurement points. See the table below.
1. With the cable under test still connected as shown in Figure 4-4,
press .
2. The analyzer first displays a pop up message that says: Setting up
SRL Cable Scan…. The message Scanning Cable… appears while
the scan is in process.
3. Pressing any key will abort the scan.
Resolution
Fstop Fstart–
N
--------------------------------=
F
start
F
stop
N Resolution
No Cable Scan
5 MHz 1000 MHz 201 4.95 MHz
5 MHz 1000 MHz 1601 612 kHz
Using Cable Scan
5 MHz 1000 MHz 8005 125 kHz
BEGIN
125 kHz
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