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13
2.2.2.
Seleeting the waveform
The required waveform can be
seleeted
by means of the WAVEFORI'y1
switch.
The
scale
of this switch
is
divided in two
ranges.
One range comprises the time-symmetrical signals
(11 '
~,
-
,
rv ) while the other comprises the time-asymmetrical
signals
~,'/\,'LJ,ru).
The
signal
with the
seleeted
waveform is
available
at the BNC-socket OUTPUT.
Attention: For time-asymmetrical, the upper frequency limit is
1
MHz and is obtained in position 100 k of
the frequency-range
switch
FRED. MUL T/PL.
2.2.3.
Setting the frequency
The frequency can be
set
by three different controis:
1. frequency controi FREOUENCY Hz with linear scale
2. frequency-range seleetor F R
EO.
MU LTI PL.
""""'
3. frequency-offset controi
FREO.
OFFSET
The required nominal frequency is
set
by the frequency controi
and
frequency
range selector,while
the
frequency-offset controi must be kept at zero (mid-position). The output frequency equals the product of the
reading of the linear
scale
and the multiplier factor of the frequency-range
selector
(example
:
scale
reading
1.9 x range
seleetor
10 k
=
output frequency 19
kHz).
A frequency increment of
±5
%
of the set value can be set by means of the frequency-offset control
.
2.2.4.
Setting the amplitude and d.c.-offset
The signal ampl itude at BNC socket OUTPUT can be
set either
continuously by controi AMPLITUDE or/and
by
step-attenuator
O
dB/
-20 dB.
If the attenuator is set to O dB, the amplitude controi covers a range up to 40 V pp . However, if the attenuator
is
set to
-20
dB, output voltages up to 4 V pp are obtainable. A d
.c.
voltage can be added to the output
signal
by means of
selector
+DC OFFSET/O/-DC OFFSET and potentiometer DC OFFSET. In position O of the
seleetor
the d.c. offset
is
cut off, while the polarity is
seleeted
by its two other positions. The offset voltage
can be
set
continuously between O and 10 V by the offset control.
Indicator OVER RANGE shows that overdriving of the output amplifier will occur due to simultaneous settings
of both AMPLITUDE and DC OFFSET controls when an
excessiv e
voltage is fed into the
amplifier.
The overrange pilot lamp will already light at this particular
settings
when there is no
signal
at the OUTPUT
terminal, e.g. before releasing
a single
shot. The output voltage limits of the sum of seleeted signal and DC-offset,
monitored by the overrange indicator, are ±20 V with the step attenuator at O dB
and
±2 V with the step
attenuator at -20 dB.
2.2.5_
Square-wave
signal
output
At output SOUA R E OUT the generator del ivers a
square-wave signal
of 2 V pp symmetrical to
zero.
The
-
frequency
equals
the set frequency. The duty
cycle
depends on the selected
signal
form. For
signals
symmetrical to time, the duty cycle is 0.5 and for signals non-symmetrical to time it is 0.1 or 0 .9 respectively.
-
-
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