User`s guide

Table Of Contents
274 Agilent E5505A User’s Guide
10
FM Discriminator Measurement Examples
Setup considerations
Connecting cables
The best results will be obtained if semi-rigid coaxial cables are used to
connect the components used in the measurement; however, BNC cables have
been specified because they are more widely available. Using BNC cables may
degrade the close-in phase noise results and, while adequate for this example,
should not be used for an actual measurement on an unknown device unless
absolutely necessary.
Measurement environment
The low noise floors typical of these devices may require that special attention
be given to the measurement environment. The following precautions will help
ensure reliable test results:
Filtering on power supply lines
Protection from microphonics
Shielding from air currents may be necessary.