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Extending
Operation
4-7
I<ey
seqyenoe
w H i g -
.
wide
Nammr
IF
filter
I F
FaeY
OUT
Automatic Selection
3.0
SPCL
,
(5925-1
Fitter
(30-Bw)
Tuning
Both the RF Power and TRFL calibration techniques require that the
HP
8902A is tuned to the frequency of the input signal.
As
shown in
Chapfer
I,
there are two ways to tune to the input signal. If you know the
frequency of your input signal, the most direct way to tune is
by
keying
in the frequency of the input signal and then pressing the MHz key. If you
do not know the input frequency, set the input signal level to between
0 and -20 dBm, then press the FREQ key, the Blue
Shift key, and the AUTO
TUNING key on the
HP 8902A. When the
HP
8902A displays the frequency
of the input signal, press the
MHr key to select Manual Tuning, and then
re-enter the TRFL measurement mode and proceed with your measurement.
increasing Selecfivify
To minimize the possibility of unwanted low frequency and spurious signals
entering the passband of the
TRR.
measurement, a high-pass RF filter and
bandpass IF filter
can
be selected. (Table 4-2 shows the filter configurations
possible for the TFGL measurement.) Remember that when using the
IF Average detector, the IF filters determine measurement bandwidth. (Be
sure to select the desired filters before performing the "RFL calibration.)
Table
4-2.
Filter Configurations
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