Philips pm3232 - Time-Base Generator and Horizontal Amplifier

83
3.2.B.7.
Trigger sensitivity
—
Set AC-O-DC switches
SK16 and
SK19
to DC
—
Set LEVEL
potentiometer
R3
to obtain
a stationary
display
—
Set
TIM E/cm
switch
SK2 so
that
a reasonable
number
of
cycles
is displayed
—
Check
the
trigger
sensitivity in
accordance
with the
following
table
Input
signal
to
Frequency
(sine wave)
Depress
source
switch
Depress
mode
switch
Depress
BEAM
Triggering
SELECTOR
Ya
BU3
20
Hz
Ya
SK4
AUTO SK 10
ASK14 8 mm
10 MHz
8 mm
20 Hz
AC SK1
1
8 mm
10
MHz
8 mm
5 Hz
DCSK12
8 mm
10 MHz
8
mm
Yb
bus
20 Hz
YbSK5
AUTO
SK 10
BSK15
8 mm
10 MHz
8 mm
TRIGG
BU2&
20 Hz
EXTSK6
BSK15
0.8
V
Yb
bus
10 MHz
0.8 V
3.2.5.8.
TV
Triggering
~
Depress
Ya
switch
SK4, TV
switch SK13,
+
switch
SK8
and BEAM
SELECTOR
switch A
SK14
““
Set
AMPL switch
SK17
to
.1
V and AMPL
potentiometer
R4
to
CAL
—
Apply
a television signal
of
240
mV,
positive video,
French
system,
to
Ya
input
socket
BUS
-
Check
that the display
starts
with
a
frame
sync
pulse
in
positions
.5 s
to
50
^Lts
of
TIME/cm
switch
SK2 and
with
a
line
sync
pulse in
positions
20
/is
to
.2
/xs
—
Replace the
input
signal
by a similar signal
with
negative
video
information
-
Depress
switch
SK9
—
Set TIME/cm
switch
SK2 to
50
jus
and TIME/cm
potentiometer
R2 to
CAL
—
Check
that
the display
starts
with
a frame
sync
pulse
-
Set Tl
M E/cm
switch
SK2 to
20
jus
—
Check
that the display
starts
with
a
line
sync,
pulse
3.2.6.
TIME-BASE
GENERATOR
AND
HORIZONTAL
AMPLIFIER
3.2.6.
1. Time
coefficients
(R534,
R539, R618)
-
Depress
Ya
switch
SK4,
+
switch
SK8,
AUTO
switch
SK10,
X MAGN
switch SK1
and
BEAM
SELECTOR
switch
A SKI
4
—
Set
TIME/cm
potentiometer
R4 to CAL
—
Set LEVEL
potentiometer
R3
to its
mid-position
-
Set
TIME/cm
switch
SK2
to .5 ms
-
Check
that the
length
of the
time-base line
Is
10
to
10,5
cm; if
necessary,
readjust
potentiometer
R618
(Fig.
3.12.)
-
Set TIME/cm
switch
SK2
to
20
jus
-
Apply a
time
marker
voltage
with a
repetition
time
of
20
jus
to
Ya
input
socket
BU3
-
Check
that the
8 centre
periods
have
a
total
width
of
8 cm; if
necessary
readjust
potentiometer
R534 (Fig,
3.12.)
—
Set Tl M
E/cm
switch
SK2
to
20 ms
"
-
Change the
repetition
time
of
the input
signal
to 20
ms
-
Check
that
the
8
centre
periods
have
a total
width
of
8 cm; if
necessary,
readjust
potentiometer
R539
(Fig.
3.12.)
-
Check
that
in
the
other
positions
of
TIME/cm
switch
SK2 the
8 centre
periods
have
a
total
widtfi
of
8 cm
+
or
-4
%
(the
repetition
time of
the
input
signal
must
always
correspond
to
the
setting
of
TIME/cm swit(h
SK2
~
Check
that
the
length
of
the
time-base
line
Is
10
to
12
qm
in
all
positions
of
TIME/cm
switch
SK2
-
Check
that
the
control
range
of
TIME/cm
potentiometer
R2
is
1
:2,6 to 1
:5