Agilent Technologies HP 8642A/B Specifiche Pagina 151

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Description of the Double Sided Spur Discriminator
Constant Calibration Method
An RF spectrum analyzer is required to measure the relative difference
between the fundamental signal and the spur. A spur level of —20 to
130 dBc is acceptable, however, levels within the range —26 to —60 dBc
are optimum. The calibration spur should be adjusted to an offset
frequency (FM rate) that can be accurately measured by the RF analyzer or
modulation analyzer. A recommended rate of less than ^ will insure that
the spur is within the flat response region of the discriminator's frequency
response.
NOTE
It is important to insure that the level of the calibration
spurs are greater than the level of any other spurious
signals present in the frequency spectrum. Also, you should
evaluate both sideband calibration spurs to ensure that they
are equal in amplitude. (Any deviation in the amplitude
of the calibration spurs indicates the presence of AM in
the phase modulator.) Modulation Analyzers reject the
AM contribution to the sidebands thus removing any
inaccuracies due to AM.
The calibration spur value can be entered either during the measurement
definition process when the Calibration Process display is accessed, or
can be entered when the Connect Diagram, is accei
will
A
display
calibration spur values can be entered.
When the system measures the calibration spur, the analyzer does a
peak search over a frequency span of two times the entered spur offset
Calibr Process: $N w/FM Discriminator 2-83
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