CFG253 Performance Verification & Adjustment Procedures
Page 11 of 19 Procedure #: CP1005 Revision: A
CFG253 ADJUSTMENT PROCEDURE
NOTE:
The Adjustment procedure should be performed only by
qualified service technicians.
CONTENTS:
Preparation 11
Test equipment requirements 12
Set U1 input voltage 12
Set Q5 gate voltage 12
Adjust square wave duty cycle 13
Set DC offset 14
Square wave overshoot, rise and fall times 15
Set output levels 15
Sine wave distortion 16
Frequency dial accuracy 17
Reassembly 19
PREPARATION FOR ADJUSTMENT
This procedure should be accomplished at an ambient temperature of 21 to 25 degrees C and
a relative humidity of 75% or less.
It is necessary to remove the bottom cover from the instrument to gain access to the
adjustments used in this procedure.
Turn off the POWER switch, disconnect the power cord and place the CFG253 upside down
on its top.
Remove the 2 screws in the rear feet and the 2 screws BESIDE the front feet.
Carefully lift the bottom cover off the unit, remove the handle and set these aside along with
the screws for later reassembly.
Reconnect the power cord from an appropriate AC power source and allow the instrument a
20 minute warm up period.
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