Advertisement
Model 89028
Operation
d. Allow the HP 8902A
to
tune
t o
the signal. (Wait for a frequency display.)
e. Select 32.9 SPCL. (This
is
the same
as
entering 4 . 4 SPCL, 8 . 1 SPCL, Log units, Track
Mode and 27.3 SPCL.) The light in the TRACK MODE key should be
on
at this point.
f. Press the MHz key
to
enter the manual tune mode.
g.
Select
h e d
RF Level (yellow shift key,
RF
Power key).
h. If using
an
HP 11722A or HP 11792A sensor module, press the CALIBRATE key
to
make
an absolute level measurement or set a relative reference by pressing the blue key and the
ZERO
key.
i. Step the signal level down
in
amplitude and press the CALIBRATE key whenever the
RECAL annunciator is displayed.
COMMENTS
ABOUT
SPECIAL FUNCTION 32.9:
If
the
signal
appears to be lost, set the signal level of the device-under-test
to
greater than -90 dBm.
Then select Blue Key, CLEAR (HP-IB code: BC). This key sequence forces a retune of the VCO during
Tuned
RF
Level measurements and should recapture the
signal
if it
has not
drifted
more that
5
MHz.
Once
the
signal
has been recaptured,
step
the
signal
down for low-level measurements.
If
the
signal
frequency into the HP 8902A drifts past one of the following frequency boundaries, the
M e a s u r i n g
Receiver
will
lose
the
signal
and
the measurement process must be restarted.
40
MHz,
80
MHz, 160 MHz, 320
MHz, and 640 MHz.
33.0 LO Frequency Measurement.
U s e
this special function to display the
LO
frequency for the
signal being measured.
34.0
IF Frequency Measurement.
Use this special function to display the
IF
frequency for the
signal
being measured. Special h c t i o n 3 enables you to manually select the
IF
for frequencies above 1 0
MHz. (Refer to Filters, RF and IF on page 3-259.)
35.0 RF Level Measurement. Enables the Measuring Receiver
to measure the
peak
RF
power.
This
measurement
is
selected when
RF
POWER
is
selected and no power sensor is connected
to
the SENSOR
input.
36.0. Peak Tuned RF Level Measurement. This measurement is not
as
accurate or sensitive
as
the
Tuned
RF
Level Measurement. Use the Peak
Tuned
RF
Level measurement
to
measure the level of
frequencies that
are
drifting or to determine flatness as a function of carrier frequency.
37. RF Power Calibration Factors.
U s e
this special function to manipulate
RF
Power calibration
factors. An extensive table in R F Power on page 3-78 summarizes each of these special functions. Two
tables are available with the same special function. The table being
used
is
determined by the status
of hquency Offset Mode (Special E'unction 27).
37.0 Use automatic calibration factors.
37.1 Use manual calibration factors.
3 7 . 2 Display calibration factor
status
(O=automatic, l=manual).
3 7 . 3 Enter calibration factor.
37.4 Display table size.
37.5 Prepare to recall the reference calibration factor.
37.6 Prepare to recd the next frequency/calibration factor pair.
37.9 Clear the table.
rev.
01
MAR88
3-283
Advertisement
Chapters
