Verication of system and leads
Test leads should be checked for continuity and integrity before use. The best means for checking lead
integrity and correct operation of the equipment is to perform the SFRA self-check using a standard test
object. This check is especially valuable for checking SFRA test equipment since there is generally no
intuitive way of knowing if the test equipment is giving correct results when making eld measurements.
The results of test measurements showing short circuit measurement (black), open circuit measurement
using FRAX-101 (green) and FTB-101 measurement (red).
A short circuit test
This is a test to check the integrity of test leads.
Connect the “Source”/”Reference” and “Measure” clips together and connect the respective measurement
earth/ground together.
The result should be an almost straight line around 0 dB (black).
An open circuit measurement
This should in theory provide a 0-response, i.e., a minus innity dB-response. However, all measurement
systems have internal noise, and the test leads will also add some response from open clips ends.
Separate the “Source”/”Reference” clip from the “Measure” clip. The clips themselves will give some inuence
at highest frequencies, if the “Measure” coaxial cable from the FRAX unit is disconnected the graph shows
the noise in the measurement system (green).
Field test box, FTB-101
Quick start tutorial
www.megger.com FRAX-series 23
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