NOTE
Before beginning this calibration proce-
dure, always let the 691XXB 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 Variable Gain
Linerarity, (3) FM Narrow and Wide Mode Sensitiv-
ity, and (4) FM Rear Panel Input Gain, and store the
results in non-volatile memory (EEPROM) on the
A17 CPU PCB.
NOTE
To ensure 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 kHz
sinewave 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%. When done,
press any key on the keyboard to continue cali-
bration.
The
$
prompt will appear on the screen when
the calibration is complete.
c. Record step completion on the Test Record.
2. Perform FM Variable Gain 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.
690XXB/691XXB MM
4-35
FM
CALIBRATION
CALIBRATION
NOTE
To save the calibration data after
completing any calibration step,
type:
calterm 787
and press
<ENTER>.
Summary of Contents for 680 C Series
Page 4: ......
Page 5: ......
Page 13: ...Figure 1 1 Typical Series 690XXB 691XXB Synthesized CW Signal Generator Model 69187B Shown ...
Page 61: ......
Page 97: ......
Page 205: ......
Page 207: ......
Page 221: ......
Page 225: ......
Page 241: ......
Page 259: ......
Page 275: ......
Page 285: ......
Page 289: ......
Page 299: ......
Page 303: ......
Page 315: ......