Anritsu 683XXB, 682XXB manual Calibration

	FM
CALIBRATION	CALIBRATION

Perform the calibration as follows:

a. At the $ prompt, type: calterm 124 and press <ENTER>.

b. Set up the Function Generator for a 0.4 Hz square wave with an output level of 2 volts peak to peak.

c. On the Spectrum Analyzer, set the Span/Div to 50 MHz per division.

d. 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 the ‘ key.

e. While observing the Spectrum Analyzer dis- play, adjust the value of the DAC’s setting to obtain a 200 MHz peak to peak deviation. This is the coarse adjustment.

f. On the Spectrum Analyzer, set the Span/Div to 5 MHz per division and adjust the center fre- quency control to position the low carrier at the center of the display. Note the frequency reading.

g. Now, adjust the center frequency control to po- sition the high carrier at the center of the dis- play. Note the frequency reading.

h. The difference between these two frequencies is the actual peak-to-peak frequency deviation. It should be 200 MHz ￿8 MHz. If not, fine ad- just the value of the DAC’s setting to obtain this deviation.

i. When finished setting the DAC, press Q on the keyboard to go to the next calibration step (ad- justing the DAC to obtain 20 MHz deviation).

j. Start calibration by pressing the 1 key.

k. While observing the Spectrum Analyzer dis- play, adjust the value of the DAC’s setting to obtain a 20 MHz peak to peak deviation. This is the coarse adjustment.

l. On the Spectrum Analyzer, set the Span/Div to 1 MHz per division and adjust the center fre- quency control to position the low carrier at the center of the display. Note the frequency reading.

682XXB/683XXB MM 4-39