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Extending
Operation
2-5
Extending
Operation
Increasing Se/ectiv
rv
The HP 8902As Auto Tuning mode is able to automatically find and tune to
the fundamental in a harmonically-rid spedrum
as
long as the fundamental
is
at least 10 dB above the level
of
the second and third harmonics. The
HP 8902A will also auto tune to the input signal if it
is
at least 30 dB above
all non-harmonically-related
RF
signals.
If,
however, your input signal does
not meet these criteria, the
H p
8902A may have
difficulty
auto tuning to the
desired input signal.
If
the instrument does not display the frequency of the
desired input signal, manually tune the
HP
8902A to the input frequency by
keying in the frequency o f the input signal and then pressing the
MHz
key.
To minimize the possibility of unwanted low-frequency, harmonic,
or spurious signals entering the IF passband, a high-pass RF filter and
bandpass
IF
filters can be selected. Table
2-2
shows the possible filter
combination selections.
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