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c. Set up the Function Generator for a 99.8 kHz
sine wave with an output level of 0.707 volts
RMS (2 volts peak to peak). Use a frequency
counter to verify the output frequency of your
function generator is set to ±1%.
d. On the Spectrum Analyzer, set the Span/Div to
50 kHz per division.
e. On the computer keyboard, use the ‘, 1, 2. and
3 keys to increment and the 7, 8, 9, and 0 keys
to decrement the value of the DAC’s setting.
Start calibration by pressing an increment key.
f. While observing the first Bessel null (Figure
4-14) on the Spectum Analyzer display, adjust
the value of the DAC’s setting to reduce the
carrier level as low as possible.
g.
When finished setting the DAC, press
Q on the
keyboard to exit the calibration routine.
h. Record step completion on the Test Record.
8. Store the calibration data as follows:
a.
At the
$ prompt, type: calterm 787 and
press <ENTER>. (The
$ prompt will appear on
the screen whe the calibration data has been
stored.)
b. Record step completion on the Test Record.
4-50 682XXB/683XXB MM
FM
CALIBRATION CALIBRATION
NOTE
You may need to adjust the RBW
setting on the Spectrum Analyzer in
order to see the >–50 dBc null.
CAUTION
When saving calibration data, turn-
ing off the instrument before the
$
prompt returns to the screen can
cause all stored data to be lost.