1.
Set the IMPEDANCE switch to 600. Connect the standardized
voltmeter and a 600-ohm load to the OUTPUT terminals.
2.
Set the Model 206A for an output of 100 cycles.
3.
Turn the AMPLITUDE control to zero (maximum counterclock-
wise) position. Check that the three attenuator dials are set to
0.
Set the c ontrol
panel voltmeter pointer to zero with the zero
adjust screw (located at a midpoint on the face of the meter, be-
low the window).
4.
Adjust the AMPLITUDE control to obtain an indication of ex-
actly 4 volts on the external voltmeter.
If
the internal voltme-
ter does not indicate exactly 4 volts also, adjust resistor R69
to obtain exactly a 4-volt indication on the internal meter.
4-11 ADJUSTMENT OF OUTPUT AT 600G
This equalization adjustment has been set at the factory, and it is
improbable that it will require readjustment. Should line-matching
transformer T2 ever be replaced, however, equalization of the
600 and 600G outputs may be obtained by the following procedure.
1.
Connect a high-impedance vacuum tube voltmeter and a 600-
ohm load to the OUTPUT terminals.
2.
Set the
Model206Afor anoutput of 1,000 cycles. Set the IM-
PEDANCE switch at 600.
3.
Adjust the AMPLITUDE control to obtain an indication of 4 volts
on the external voltmeter.
4. Switch the IMPEDANCE control to
600G, and adjust resistor
R74 (located as shown in Fig.
4) until a 4-volt indication is
obtained on the external voltmeter. Repeat until there is no
change between the output levels at the 600 and 600G positions.
4- 12
ADJUSTMENT FOR CENTERING SELECTIVE AMPLIFIER
OUTPUTLEVEL
CAUTION
THIS ADJUSTMENT HAS BEEN SET AT THE FACTORY AND,
UNLESS THE RANGE SWITCH OR ONE OF THE TUNING CA-
PACITORS
HAS
BEEN REPLACED, THE ADJUSTMENT SHOULD
NEVER UNDER ANY CIRCUMSTANCES BE CHANGED. IF RE-
PLACEMENT OF THE RANGE SWITCH OR TUNING CAPACITOR
EVER SHOULD BE NECESSARY, IT
LS
RECOMMENDED THAT
THE INSTRUMENT BE RETURNED TO THE FACTORY FOR THE
REPLACEMENT AND NECESSARY READJUSTMENTS.
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