Philips PM 3266 - 3.4.10. Vertical channels

156
3.
4.
1 0. 1.
L F.
correction
amplifier
(A
ttenuator
unit)
—
Depress
push-button
A (B) of
the
display mode
controls
(SI
)
-
Depress
push-button
MAIN TB
of the
X deflection
controls
(S2)
—
Push the
Y
POSITION
controls
to position NORMAL
—
Depress
push-button
DC of
the channel
A (B) signal-coupling
controls
—
Depress
push-button
A
(B) of the
m.t.b.
trigger-source
controls
(S22)
-
Set the
channel
A
(B) AMPL switch
to lOmV/DIVand
its vernier
to CAL
—
Set
the m.t.b.
TIME/DIV
switch
to .2
ms
and its
vernier
to CAL
-
Set the
d.t.b.
TIME/DIV
switch
to
OFF
-
Apply
a square-wave
voltage of
60 mV,
repetition
rate 200 Hz,
to the
channel
A (B)
input
-
Check
that
the pulse
top is
straight; if
necessary,
readjust
potentiometer
R132
(ch. A)
or R
182
(ch.
A)
on
the
attenuator
board.
3.4.
10.2.
Square-wave
response
(Attenuator
unit)
-
Depress
push-button
A
(B) of
the
display-mode
controls
(SI
)
-
Push
the
Y
POSITION
controls
to NORMAL
-
Depress
push-button
DC of
the
channel
A
(B) signal-coupling
controls
-
Depress
push-button
A (B) of
the m.t.b.
trigger-source
controls
(S22)
-
Depress
push-button
MAIN
TB
of the
X deflection
controls
(S2)
-
Set the
m.t.b.
TIME/DIV
switch to
.2
ms
and its vernier
to CAL
-
Set
the
d.t.b.
TIME/DIV
switch
to
OFF
-
Apply
a
square-wave
voltage
with
a frequency
of
2 kHz,
rise time
<
200 ns,
to
the
channel
A (B) input;
peak
to
peak value
as indicated
in
the
table below
-
Check
that
the
pulse top
errors
do not
exceed
+/—
3%;
if
necessary,
readjust
the
relevant
trimmers
A
(B)
AMPL
Ya
(Yg)
input
signal
Adjuster
Trace
height
2
mV
12 mV
—
6
DIV
-t/-3'
5
mV
30 mV
—
6DIV-I-/-3'
10
mV
60 mV
—
6DIV-I-/-3'
20 mV
120 mV
-
6DIV+/-3'
50
mV
300 mV
6DIV-t/-3'
.1 V
600
mV
Cl
07
(ch. A)
or C157 (ch. B)
6
DIV
+/-3'
.2 V
1,2
V
—
6
DIV
+/-3'
.5
V
3
V
-
6 DIV+/-3'
1 V
6 V Cl
12
(ch. A)
or Cl 62
(ch.
B)
6DIV-t/-3'
2 V
12 V
-
6 DIV
+1-2'
5 V
30
V
—
6DIV-H/-3'
—
Remove the
input
signal.
3.4.
10.3.
Input
capacitance (Attenuator
unit)
—
Depress
push-button
A (B)
of
the display-mode controls
(SI
)
—
Push the
Y POSITION
controls
to NORMAL
—
Depress
push-button DC of the channel
A
(B)
signal-coupling
controls
—
Depress push-button
A (B) of the m.t.b. trigger-source
controls
(S22)
—
Depress push-button
MAIN TB of the
X
deflection
controls
(S2)
Set the m.t.b. TIME/DIV switch
to .2
ms and its
vernier
to CAL
—
Set
the
d.t.b. TIME/DIV switch
to
OFF
—
Apply a square-wave
voltage with
a
frequency of
2
kHz,
rise
time
<200 ns, to the channel
A (B)
input
via an
2:1
dummy
probe. Fig.
3.27.
(1
Mohm ±
0,1
%//15
pF);
peak
to
peak value as indicated
in the table below
—
Check that the
pulse top errors
do
not exceed
+/—
3
%;
if necessary, readjust
the relevant trimmers.