Agilent Technologies 87075C Option H08 User's And Service Manual page 21

General Information
Performing the Operator's Check
This is an 80% confidence test only. A test set could pass this simple test
NOTE
and yet still not function properly. For more complete testing, see
"Performance Tests" on page 45.
If a more complete test is desired, repeat the above procedure, but this
time terminate each port being tested with a known good 75 Ω load
(with a return loss of better than 40 dB). The resulting return loss
should be a maximum of 15 dB.
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