Insertionlossofcables - Agilent Technologies HP 8719D Service Manual

1. Replace the load with a short.
2. lb measure the insertion loss of the cable over the entire specified band,
press
tracking and look for the worst case measurement. Rower holes >0.5 dl3
indicate a bad cable See F'igure 2-4 for example insertion loss measurements
of a good cable. Refer to the cable manual to see if the cable you are
measuring meets its insertion loss speciilcation. If it doesn't, the cable should
be either repaired or replaced.
In this S1l measurement, the displayed trace results from energy being
propagated down the cable and reflected back from the short. Therefore,
the correct insertion loss is approxhnately the measured value divided by 2
(one-way path loss of the cable).
2-10