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Philips PM 5167 - 3. Setting the Frequency; 4. Setting the Amplitude and D.C.-Offset; 5. Square-Wave Signal Output

Philips PM 5167
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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
L
TI
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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