Philips pm3232 - Page 40

82
3.2.5.3.
Trigger slope
—
Depress
Y/\
switch
SK4, AUTO
switch
SK10,
+
switch
SK8 and
BEAM
SELECTOR switch
A SK14
—
Set
TIM
E/cm switch
SK2 to
.2 ms and TIM E/cm
potentiometer
R2
to
CAL
—
Set
AMPL switch
SKI
7
to
.1 V/cm and AMPL
potentiometer
R4
to
CAL
~
Apply
a
sine-wave signal
of
600
mVp.p, frequency 2 kHz,
to
Y/\
input
socket
BUS
—
Adjust
LEVEL
potentiometer
R3
for
a
stationary display
—
Check that the display starts with the
positive
slope
of
the signal
—
Depress
—
switch
SK9
—
Check that
the
display
starts with the negative
slope of
the signal
3.2.5.4.
Level range with external triggering
—
Depress EXT switch
SK6, AC
switch
SK1
1,
+
switch
SK8
and
BEAM
SELECTOR
switch
A SKI
4
—
Set
AMPL switch SKI 7
to
10 V/cm and
AMPL
potentiometer R4
to
CAL
—
Set
TIME/cm switch
SK2 to .2 ms and
TIME/cm potentiometer
R2 to CAL
—
Apply
a
sine-wave
voltage of
20
Vp.p,
frequency
2
kHz,
to both TRIGG Input
socket
BU2 and Y/\
input
socket BUS
—
Check
that
the time-base generator
cuts
out when LEVEL potentiometer RS is turned
fully
anti-clockwise
and
fully clockwise
—
Depress
—
switch SK9 and repeat the
check
3.2.
5.5.
Level and level
range
-T-
Depress Y/\ switch
SK4, AUTO
switch SK10,
+
switch
SK8
and BEAM
SELECTOR
switch
A SK14
—
Set
AMPL
switch SKI 7 to .1 V/cm and
AMPL
potentiometer R4 to CAL
“
Set
TIME/cm
switch
SK2
to .2 ms and
TIME/cm potentiometer R2 to CAL
—
Apply a
sine-wave
voltage
of
600 mVp.p, frequency 2 kHz, to
Y^
input
socket
BUS
“
Check that
the starting point of the trace moves upwards when
LEVEL potentiometer
RS is turned
clockwise
—
Check that the
starting
point of
the
trace
can be shifted over 5 cm
by
means
of LEVEL
potentiometer RS
—
Depress AC switch SK1
1
—
Set AMPL switch SK17 to
50
mV/cm
—
Check that the time-base
generator
cuts
out
when LEVEL
potentiometer
RS
is
turned fully
anti-clockwise
and
fully clockwise
—
Set AMPL SK17 switch
to
20
mV/cm
—
Check
that the time-base
generator does not
cut out when
LEVEL
potentiometer
RS is turned
fully
anti-
clockwise
and fully
clockwise
3.
2.
5.6.
Mains triggering
-
Depress EXT
switch SK6,
+
switch
SK8, AUTO
switch
SK10 and BEAM
SELECTOR
switch
A SK14
—
Set TIME/cm switch SK2
to 20
ms and TIME/cm potentiometer R2
to
CAL
—
Apply a
voltage
with the mains
frequency
to
Y^
input socket BUS; trace height
1 cm
—
Check
that the
oscilloscope
displays
a
moving
sine
wave
—
Depress MAINS switch
SK7
—
Check
that
the display is
stationary