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Philips PM3208 - 5.3.17 Input Impedance Adjustment; 5.3.18 Dual A and B, Polarity Inversion Channel B; 5.3.19 ADD Facility

Philips PM3208
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5
PERFORMANCE
CHECK
AND
ADJUSTMENT
PROCEDURE
5-9
5.3.17
Input
impedance
adjustment
TEST
EQUIPMENT
SETTING
REQUIREMENTS
ADJUSTMENT
1
ADJUSTMENT
2
SETTING
ADJUSTMENT
Square-wave
calibration
generator
Vertical
mode
-
A
Channel
A
AMPL/DIV
-
5
mV
Apply
a
1
kHz
square-wave
signal
to
channel
A
via
a
10:
1
probe
and
set
the
amplitude
at
5
div.
Adjust
the
probe
trimmer
for
a
proper
waveform.
After
that,
set
AMPL/DIV
-
0,1
V
for
adjustment
1, at
1
V
for
adjustment
2.
Pulse
aberrations
must
be
<
5
%.
Adjust
VC4
(VERT
PCB)
for
optimum
waveform,
AMPL/DIV
-0,1
V.
Adjust
VC7
(VERT
PCB)
for
optimum
waveform,
AMPL/DIV
-
1
V.
Repeat
for
channel
B.
Repeat
for
channel
B
by
means
of
VC104
and
VC107
(VERT
PCB).
5.3.18
Dual
A
and
B,
polarity
inversion
channel
B
TEST
EQUIPMENT
SETTING
REQUIREMENTS
ADJUSTMENT
5.3.19
ADD
facility
TEST
EQUIPMENT
SETTING
REQUIREMENTS
ADJUSTMENT
Square-wave
calibration
generator
Vertical
mode
-
DUAL
Both
channel
A
and
B
coupling
-
DC
Both
channel
A
and
B
AMPL/DIV
-
0,5
V
TIME/DIV
-
0,5
ms
Apply
a
1
kHz
square-wave
signal
to
both
A
and
B
and
set
fo:
a
trace
height
of
4
div.
Check
whether
A
and
B
are
displayed
with
the
same
polarity.
Switch
the
channel
B
position
switch
to
INVERT
and
check
whether
the
polarity
of
waveform
B
is
reversed.
NO
Square-wave
calibration
generator
Vertical
mode
-
DUAL
Both
channel
A
and
B
coupling
-
DC
Both
channel
A
and
B
AMPL/DIV
-
0,5
mV
TIME/DIV
-
0,5
ms
Apply
a
1
kHz
square-wave
signal
to
both
A
and
B
and
set
fo!
a
trace
height
of
4
div.
Check
whether
A
and
B
are
displayed
with
the
same
polarity,
waveform
height
4
div.
Press
ADD
and
check
that
only
one
waveform
of
8
div
is
shown.
Switch
channel
B
to
INVERT
and
check
that
only
one
straight
line
is
displayed.
NO
5.3
PERFORMANCE
CHECK
AND
ADJUSTMENT
PROCEDURE

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