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10
C. ADJUSTING
THE
OUTPUT
VOLTAGE
1. Sinusoidal voltage
Set switch
"
~/
'U
"
(SK3)
to position
"~"
.
The
output voltage at sockets
BUI-BU2 can be adjusted with knob
"AMPLITUDE"
(R2)
between
approximately
3
mY
rms
and 2 Y
rm
s
(unioaded).
2. Square wave voltage
Set switch
"
~/
'U
"
(SK3)
to position"
'U
"
.
The output voltage at
sockets
BU1-BU2
can
be adjusted witll knob
"AMPLITUDE"
(R2)
between
approximately 6 mY
p
_
p
and 4V
p - p
(unioaded).
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 for
changing
the d.c. voltage level
(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 recommended
that the output voltage of the generator is measured with a voltmeter with
a high input impedance for obtaining
accurate measurements.
By doing
so, the exact
value
of the
voltage
which is
applied
to the circuit
connected
will be known.
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