Anritsu 682XXB, 683XXB calterm 123 , calterm 148 , 682XXB/683XXB MM 4-45

4. Connect the 682XXB/683XXB RF OUTPUT to the
Spectrum Analyzer RF Input.
NOTE
Before beginning this calibration proce-
dure, always let the 682XXB/683XXB
warm up for a minimum of one hour.
FM
Calibration
Procedure
The following steps in the procedure lets you cali-
brate the (1) FM Meter circuit; (2) FM VariableGain
Linearity; (3) Locked, Locked Low-Noise, Unlocked
Narrow,and Unlocked Wide FM Mode Sensitivity;
and (4) FM Rear Panel Input Gain, and store the re-
sults in non-volatile memary (EEPROM) on the A17
CPU PCB.
NOTE
Toensure accurate calibration, each step of
this procedure must be performed in se-
quence.
1. Perform FM Meter calibration as follows:
a. At the $prompt on the PC screen, type:
calterm 123 and press <ENTER>.
b. Set up the Function Generator for a 100.0 kHz
sine wave with an output level of 0.707 volts
±0.01 volts RMS (2 volts peak to peak). Use a
frequency counter to verify the output fre-
quency of your function generator is set to
±1%. When done, press any key on the key-
board to continue calibration.
The $prompt will appear on the screen when
the calibration is complete.
c. Record step completion on the Test Record.
2. Perform FM VariableGain Linearity calibration
as follows:
a. At the $prompt on the PC screen, type:
calterm 148 and press <ENTER>.
b. Set up the Function Generator for a +1.00 Vdc
output. When done, press any key on the key-
board to continue calibration.
The $prompt will appear on the screen when
the calibration is complete.
c. Record step completion on the Test Record.
682XXB/683XXB MM 4-45
FM
CALIBRATION CALIBRATION
NOTE
To save the calibration data after
completing any calibration step,
type: calterm 787 and press
<ENTER>.