CFG253 Performance Verification & Adjustment Procedures
Page 14 of 19 Procedure #: CP1005 Revision: A
4. Set DC Offset
a. Set-Up:
DC OFFSET Pulled Out
RANGE 1K
FUNCTION All Buttons Out
VOLTS OUT Button Out
FREQ/10 Button Out
b. Test Scope Set-Up:
Volts/Div 2V
Time/Div 0.2 mSec
Var Time/Div Cal
c. Connect MAIN OUTPUT to test scope vertical input via coax cable and 50 ohm
terminator.
d. Set test scope Vert Coupling to GROUND, center the trace, then set Coupling
back to DC.
e. While turning the DC OFFSET knob from CCW to CW and back, adjust R117 for
equal voltage swings positive and negative on the test scope.
f. Adjust R129 for 5.1 V with DC OFFSET knob CW and -5.1 V with the knob CCW
(2.55 Div on test scope). Repeat step e, if necessary.
g. Push the DC OFFSET knob in (off).
h. Set the test scope to 10 mV/Div.
i. Set test scope Vert Coupling to GROUND, center the trace, then set Coupling
back to DC.
j. Slowly adjust R82 to recenter the trace, set to within 1 division of center (+/- 10
mV).
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