Anritsu 682XXB, 683XXB 4-50 682XXB/683XXB MM

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’ssetting.
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’ssetting to reduce the
carrier level as low as possible.
g. When finished setting the DAC, press Qon the
keyboard to exit the calibration routine.
h. Record step completion on the TestRecord.
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
settingon the Spectrum Analyzer in
order to see the >–50 dBc null.
CAUTION
Whensaving calibration data, turn-
ing off the instrument before the $
prompt returns to the screen can
cause all stored data to be lost.