Philips pm3232 - Mains Voltage Fluctuations; Beam Selection; X-Y Operation (R601)

84
3.2.G.2.
Magnification
and shift (R617)
—
Depress
Y
/\
switch SK4,
+
switch SK8, AUTO
switch
SK10
and
BEAM SELECTOR
A
SK14
—
SetTIME/cm
switch
SK2
to
20
iis
and TIME/cm
potentiometer R2 to CAL
—
Apply
a
time
marker voltage
with
a
repetition time
of
20
/is
to
Y/\ input socket BUS
“Pull X
MAGN
switch SKI to
x5
—
Shift
every
cycle on
to
the
screen by
means
of X POSITION
potentiometer
R1
and
check
that
each
cycle
has a
width of 5
cm
+
or
—2
%;
if necessary,
readjust
potentiometer
R617 (Fig. 3.12.)
“
Check that
with
X
POSITION
potentiometer
R1 the
beginning and
the end
of
the
time-base
line can
be
displayed
within the
graticule
—
Set
TIME/cm
switch SK2
to
.2
/is
—
Change
the
repetition
time
of
the
input
signal
to
.2
/is
—
Check that
the
widths
of
all
periods are
equal
within
+
or
—
2 %
3.2.7.
MAINS
VOLTAGE
FLUCTUATIONS
—
Vary the
mains
voltage
+
and
—10
% with
respect to
the
nominal
mains voltage as
indicated
by
the
voltage
adapter
—
Check that
the
vertical and
horizontal
deflection are not
affected and
that
the
brightness does not change
3.2.8.
BEAM
SELECTION
—
Depress AUTO
switch SK10
—
Set
TIME/cm
switch
SK2
to 1 ms
—
Set
AMPL switches SK17
and
SK18
to .1
V/cm
-
Depress
BEAM SELECTOR
switch A
SK14
—
Check that
only the
channel
Y/\ time-base
line
is
visible
—
Release
BEAM SELECTOR
switch A SK14
and
depress
B
SK15
—
Check that
only the channel
Yg
time-base
line is visible
3.2.9.
X-Y
OPERATION (R601)
-
Depress AUTO
switch
SK10,
X
MAGN
SKI and
BEAM
SELECTOR
SWITCHES A SK14
and
B
SK15
-
Set
TIME/cm
switch SK2
to 5
ms
-
Set AMPL switch SK17
to
.1 V/cm
and
AMPL
potentiometer
R4
to
CAL
-
Set
POSITION
potentiometer
R11 to
its
mid-position
—
Set
AC-O-DC
switch SK16
to AC
-
Set X
POSITION
potentiometer
R1
to
such
a
position that
the
time-base
lines start at
the
beginning
of the
measuring
graticule
—
Centre
the
Yg
time-base
line by
means
of POSITION
potentiometer
R12
-
Set
TIME/cm
switch
SK2 to
position X
via
Y/\
—
Check that
the
spot is
displayed in the
centre of
the
screen;
tolerance
+
or
—5
mm
—
Check that
no
Y/\ trace
is
visible,
also
when
POSITION
potentiometer R1 1 is
rotated
-
Apply a
sine-wave
voltage of
800
mVp.p, frequency
2 kHz, to
Ya
input
socket
BU3
—
Centre the trace by
means of
X POSITION potentiometer
R1
—
Check that the trace
width
is
8 cm
+
or
—
5
%;
if necessary,
readjust potentiometer
R601
(Fig.
3.12.)
—
Increase
the
frequency of
the input
voltage
to
1
MHz
—
Check that
the trace width is at least 6 cm