Philips PM 3266 - Page 31

31
FAST
ERASE
Enables
waveform
to
be
recorded
at
high
writing
speed.
The
VI
EW
TIME
and
INTENS
controls
are
operative.
Enables
erasure
of
the
waveform
that
is written
on the
storage
layer
of
the
c.r.t.
This
control
is not
effective
in the
STORE
mode.
MEMORY
OFF
If
the
STORE
and WRITE
pushbuttons
are
depressed
together
the memory
function
of
the c.r.t.
is
switched off.
The
instrument
functions
in
the STORE
mode in the
event
of
a faulty
pushbutton
combination
being
selected.
PERSISTENCE/V
lEW
TIME
In
the WR ITE
mode,
this control
enables
a variable
retention
period
for the
recorded
waveform
(variable
persistence).
The MAX
position
gives an
increase of
the writing
speed
by
a factor
of
approx.
10 times;
in
this
position the
c.r.t. shows
some
background
illumination.
In the FAST
mode,
automatic
erasure
followed
by the
recording
of
a
new
picture
occurs
after
a
certain
time. This
time
is determined by
the
position
of the VIEW
TIME
knob.
In the MAX
position of this knob,
recording
of a new picture
occurs only
after
the
ERASE
button
has
been depressed. In
this position the
c.r.t. shows
some background
illumination.
FOCUS
Continuously variable
control
of the
c.r.t. electron beam
focusing
in the horizontal
direction.
The
vertical focusing
is influenced
by the
INTENSity
control.
Therefore,
the vertical focusing
remains well-adjusted over
nearly
the whole INTENSity
range.
For the
extreme
positions of the INTENS control,
the
vertical
focusing potentiometer
is adjustable via a ventilation
hole in
the left-hand
side of
the
instrument.
The highest writing
speed in the
FAST
mode is only obtained
for
optimum focusing
of the electron beam.
TRACE ROT
(R15);
Preset
control for
aligning the trace with
the graticule line.
Screw
driver
control on left-hand
side of the instrument.
2. 2.
1.6. Miscellaneous
CAL (XI
,
X2)
Output socket providing
a 2 kHz square-wave voltage of 3 Vp-p
and
a
current of 6 mA
for
calibration
purposes
^ (X5)
Z-MOD (X8)
at
rear
side
Measuring earth socket.
Input socket for external
Z-modulation.