CFG253 Performance Verification & Adjustment Procedures
Page 15 of 19 Procedure #: CP1005 Revision: A
5. Square Wave Overshoot, Rise Time and Fall Time
a. Test Scope Set-Up:
Volts/Div 5V
Time/Div 0.5 uSec
Trig Slope +
b. Set-Up:
AMPLITUDE CW
DC OFFSET Pushed In
RANGE 100K
FUNCTION Square Wave
VOLTS OUT Button Out
FREQ/10 Button Out
FREQ DIAL 3.0
c. Connect MAIN OUTPUT to test scope vertical input via coax cable WITHOUT
the 50 ohm terminator.
d. Adjust AMPLITUDE knob for a 4 division display on the test scope.
e. Adjust C31 for minimum overshoot (will not be completely flat).
f. Set Time/Div to 50 nSec/Div. Adjust Trig Level control as necessary to display
the rising edge of the Square Wave.
g. Check risetime between the 10% and 90% points for < 100 nSec (2 Div).
h. Set test scope Trig Slope to - (negative). Adjust Trig Level to view the Falling
edge of Square Wave.
i. Check the Fall Time between the 10% and 90% points for < 100 nSec (2 Div).
6. Set OUTPUT Levels
a. Set-Up:
AMPLITUDE CW
DC OFFSET Pushed In
RANGE 1K
FUNCTION Triangle
VOLTS OUT Button Out
FREQ/10 Button Out
FREQ DIAL 3.0
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