Philips pm3232 - Page 39

81
3. 2.
4.8.
Bandwidth
of the
vertical amplifiers
-
Depress
Ya (Yb)
switch SK4
(SK5), AUTO
switch
SK10 and
BEAM
SELECTOR
switch A
SK14
(B SK15)
—
Set
AMPL
switch
SK17
(SK18)
to
.1 V/cm and
AMPL potentiometer
R4 (R5) to CAL
—
Check the
bandwidth at
a
trace height
of 6
cm
in accordance with the
following
table
Input sine
wave on Frequency Required trace
height
Y
A
(Yb)
socket
600
mVp.p
100
kHz
6 cm
600
mVp.p 10
MHz
at least
4,2
cm
3.
2.4.9.
H.F. deflection
and
cross-talk
-
Depress
Ya (Yb>
switch
SK4
(SK5),
AUTO
switch
SK10
and BEAM SELECTOR
switches
SK14
and
SK15
—
Set
AMPL
switch
SK17 (SK18)
to 50
mV/cm and AMPL potentiometer R4 (R5) to CAL
—
Apply
a sine-wave voltage of
1,2
Vp.p, frequency 3 MHz, to
Ya
(Yb)
input socket BUS (BU5)
—
Check that
the
peaks of
the signal can be displayed fairly undistortedly within the
graticule,
using POSITION
potentiometer R1
1
(R12)
—
Set
AMPL
switches SKI
7 &
SKI
8 to .1
V/cm and AMPL
potentiometers
R4
&
R5 to CAL
—
Apply a
sine-wave signal
1,2
V,
frequency
3
MHz,
to
Ya
input socket BUS
—
Set
AC-O-DC
switch SKI 9
to
0
—
Check that
the height
of
the
Yb
trace does
not
exceed 2 mm
—
Set AMPL
switches SKI
7 &
SK 18 to 2
mV/cm
and
AMPL potentiometers
R4 & R5 to CAL
—
Apply
the Input
signal
to
Yb
input
socket BUB
—
Set AC-O-DC
switch SKI
6
to
0
—
Check
that the
height of the
Ya
trace
does not
exceed 2 mm
3.2.5. TRIGGERING
3.2.5.1. Trigger
pre-amplifier (R414)
—
Depress
Ya
switch SK4,
+
switch
SK8,
AC
switch SK1 1
and BEAM
SELECTOR
switch
A
SK14
-
Set AMPL
switch
SK17
to
.1 V/cm and
AMPL potentiometer
R4 to CAL
—
Set
AC-O-DC
switch SKI
6
to
AC
—
Set TIM E/cm
switch
SK2 to .2 ms
and
TIME/cm
potentiometer
R2
to
CAL
—
Apply
a
sine-wave
signal
of 600
mVp.p, frequency 2 kHz,
to
Ya
input
socket BU3
—
Set
LEVEL potentiometer R3 to such a
position
that the trace starts at the
zero
level
of
the
sine-wave
-
Depress DC
switch
SKI
2
—
Check
that the
trace starts
at
the same point; if necessary, readjust potentiometer R414
(Fig.
3.12.)
—
Decrease the
input voltage
to 80
mV
—
Adjust LEVEL
potentiometer
R3
for
a
triggered display
-
Check that the
display
is
still
triggered when
AC switch SK1 1 is depressed
—
Depress BEAM SELECTOR
switch
B
SK15,
Yb
switch
SK5
and
DC switch
SK12
—
Apply
the 80
mV Input signal
to
Yb
socket
BUB
-
Set AMPL
switch SK18 to ,1 V/cm
and
AMPL potentiometer R5 to CAL
—
Adjust
LEVEL potentiometer
R3 for
a
triggered display
-
Depress
AC
switch
SK1
1;
the starting
point of
the
trace must not move
more than
4 mm
3.2.5.2.
Long-tailed
pair circuit (R424)
—
Depress
Ya
switch SK4,
—
switch SK9, AUTO
switch SK10
and BEAM
SELECTOR
switch
A
SKI
4
-
Set AMPL switch
SK17
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
—
Set
AC-O-DC
switch
SKI
6 to
AC
—
Apply
a
sine-wave voltage
of
80 mVp.p,
frequency
2
kHz,
to
Ya
socket BU3
—
Check that
the
display
remains
stationary
when LEVEL
potentiometer
R3
is
rotated
from fully
anti-c!o(k\/vise
to
fully clockwise; if
necessary
readjust
potentiometer R424
(Fig.
3.12.)