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Adjust C2 and C8 ( AGC and FREQ CAL ) for 8 kHz and -1.8 V.
- NOTE
C2 and C8 are interacting controls .
A little practice
may be required to become proficient at making this
adjustment.
Repeat Paragraphs 5-22 and 5-23 a through e if the voltage at 1 kliz has
been changed from
-1.8 V.
e .
With the RANGE switch set on X1K,
adjust the Dial for 10 kHz + 10 Hz .
Without moving the Dial ,
check the frequency on ranges X5 through X10K
and record the error in percent.
Calculate the average between the most positive and the most negative
error .
Readjust C2 and C8 for the following readings :
Frequency
AGC .
10 kHz minus average found above + 10 Hz
1.8 V + 0.1 V
Example :
X5
5-24 .
HIGH FREQUENCY ADJUSTMENT.
Set the Model 204C RANGE switch to X100K and set the Dial to exactly 10 .
With the Model 204C connected to the Frequency Counter ,
adjust C4 (HIGH
FREQ CAL) to indicate 1 MHZ
1 kHz on the Frequency Counter .
5-25 .
DISTORTION ADJUSTMENT .
Connect the Model 204C to the Distortion Analyzer .
Set the Model 204C RANGE switch to X1K and the Dial to 10 .
Set the Distortion Analyzer FUNCTION to SET LEVEL ,
MODE to MANUAL ,
and FREQUENCY RANGE to X1K .
Adjust the Model 204C AMPLITUDE and Distortion Analyzer SENSITIVITY
for OdB meter indication .
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