CFG253 Performance Verification & Adjustment Procedures
Page 13 of 19 Procedure #: CP1005 Revision: A
3. Adjust Square Wave Duty Cycles
a. Set-Up:
AMPLITUDE Midrange
RANGE 1K
FUNCTION Square Wave
FREQ/10 Button In
FREQ DIAL 3.0
b. Test Scope Set-Up:
Volts/Div 1V
AC/GND/DC DC
Time/Div 0.2 mSec
c. Connect MAIN OUTPUT to test scope vertical input via coax cable and 50 ohm
terminator. Adjust Trig Level as necessary for a stable display.
d. Use test scope variable Time/Div control to set the display for 1 complete cycle
over 10 divisions.
e. Adjust R67 for equal positive and negative half cycles (50 % duty cycle).
Readjust the variable Time/Div as necessary to maintain 1 complete cycle over
10 divisions.
f. Set FREQ/10 button out.
g. Adjust R126 for 1 cycle per division on the test scope.
h. Repeat steps d and e to set the 50 % duty cycles for the settings and adjustments
in Table 1.
Table 1
RANGE FREQ. DIAL FREQ/10 TIME/DIV ADJUST RESULT
1K 3.0 OUT 20uSec R127 50 % Duty Cycle
1K 0.3 OUT 0.2mSec R18 50 % Duty Cycle
1K 0.3 IN 2 MSec R16 50 % Duty Cycle
100K 0.3 OUT 2 uSec R132 50 % Duty Cycle
1M 0.3 IN 2 uSec R128 50 % Duty Cycle
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