CFG253 Performance Verification & Adjustment Procedures
Page 18 of 19 Procedure #: CP1005 Revision: A
d. Set the RANGE to 1M and adjust C8 for a reading of 3.0 MHz on the Frequency
Counter.
e. Check the Frequency Counter readout while changing the CFG253 FUNCTION
between Sine Wave and Square Wave. Adjust R76 for approximately 3.0 MHz,
setting for the best compromise between Sine Wave and Square Wave.
*** Alternate Procedure ***
( If a Frequency Counter is not available )
f. Set-Up:
AMPLITUDE CW
RANGE 1K
FUNCTION Triangle
VOLTS OUT Button Out
FREQ/10 Button Out
FREQ DIAL 3.0
g. Test Scope Set-Up:
Volts/Div 0.5 V
Time/Div 0.2 mSec
h. Connect SYNC/TTL OUTPUT to test scope vertical input via coax cable and 50
ohm terminator.
i. Adjust R6 for a display of 6 cycles in 10 Divisions on the test scope. (3KHz)
j. Set RANGE to 1M and the test scope Time/Div to 0.2 uSec.
k. Adjust C8 for a display of 6 cycles in 10 Divisions on the test scope. (3MHz)
l. Check display while changing the FUNCTION between Sine Wave and Square
Wave. Adjust R76 for 6 cycles in 10 Divisions, setting for the best compromise
between Sine Wave and Square Wave frequencies.
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