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10
2. Square wave voltage
Set switch
"'V/
'L"
(SK3) to position"
'L".
The output voltage at
sockets BU1-BU2 can be adjusted with knob "AMPLITUDE" (R2)
between approximately 6 mV
p - p
and 4 V
p
_
p
(unloaded). The output
voltage consists of a square wave voltage which is superimposed on
a negative d.c. voltage, equal to half the amplitude of the square
wave voltage.
To obtain a square wave voltage which is symmetrical with respect
to the zero line, a circuit should be used fo
r
changing the d.c.
voltage leve! (in this case, a
capacitor).
The value of this capacitor
depends
entirely on the input impedance of the circuit to be fed
and on the frequency. For
this
reason no capacitor
has
been fitted
in the apparatus.
Note:
When using the sinusoidal or the square wave voltage, it is recom
mended that the output voltage of the generator is measured
with a voltmeter with a high input impedance for obtaining accu
rate measurements. By doing so, the exact value of the voltage
which is applied to the circuit connected will be known.
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