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When an approximate null has been obtained with the Distortion Analyzer
dial and BALANCE controls ,
switch the MODE to AUTOMATIC for mini
mum meter indication .
Meter indication should be greater than 60 dB down from 0dB reference .
h .
Repeat steps a through f of this paragraph for all frequencies listed in
Table 5-4 .
Table 5-4 .
Distortion Check
Tolerance
NORM
LOW DIST
-40 dB
-40 dB
-46 dB
i .
Connect the equipment as shown in Figure 5-3 .
Set the Model 204C frequency dial to 10 and the RANGE switch to X10K .
Adjust the AMPLITUDE control for a 0dB indication on the AC Voltmeter .
Switch to the X100K RANGE ,
and adjust the frequency dial and notch filter
control for a minimum indication on the AC Voltmeter .
The meter indication should be greater than 40 dB down from the OdB
reference .
5-9 .
OUTPUT VOLTAGE AND IMPEDANCE CHECK.
Connect the Model 204C without a 600 ohm load to the AC Voltmeter .
b .
Set the AC Voltmeter to the 10V RANGE ,
and the Model 204C AMPLITUDE
to maximum .
The meter should indicate at least 5 V rms .
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