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Philips PM3208 - 5.3.13 ADD Balance Adjustment; 5.3.14 Low Frequency Response Adjustment; 5.3.15 High Frequency Response Adjustment; 5.3.16 1 kHz Square-Wave Response Adjustment

Philips PM3208
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5.3.13
5.3.14
5.3.15
5.3.16
5
PERFORMANCE
CHECK
AND
ADJUSTMENT
PROCEDURE
ADD
balance
adjustment
TEST
EQUIPMENT
SETTING
REQUIREMENTS
ADJUSTMENT
NO
Vertical
mode
-
DUAL
Both
channel
A
and
B
coupling
-
GND
Set
the
A
and
B
traces
at
the
centre
of
the
Y-axis.
Switch
vertical
mode
to
ADD.
The
trace
must
coincide
with
the
X-axis
of
the
graticule.
Adjust
VR163
("ADD"
-
VERT
PCB)
to
move
the
trace.
Low
frequency
response
adjustment
TEST
EQUIPMENT
SETTING
ADJUSTMENT
Square-wave
calibration
generator
Vertical
mode
-
A
Channel
A
AMPL/DIV
-
5
mV
TIME/DIV
-
0,2
us
Apply
a
1
MHz
square-wave
signal
to
channel
A
and
set
the
amplitude
at
5
div.
Adjust
VR313
and
VC312
("MF"
-
VERT
PCB)
to
make
the
line
from
rising
edge
to
0,2
ws
as
flat
as
possible.
High
frequency
response
adjustment
TEST
EQUIPMENT
SETTING
ADJUSTMENT
1
ADJUSTMENT
2
SETTING
ADJUSTMENT
Square-wave
calibration
generator
Vertical
mode
-A
Channel
A
AMPL/DIV
-
5
mV
TIME/DIV
-
0,2
us
X
MAGN
-
x10
Apply
a
1
MHz
square-wave
signal
to
channel
A
and
set
the
amplitude
at
5
div.
Adjust
VR47
and
VC47
("CH1"
-
VERT
PCB)
for
minimum
ringing
and
overshoot
and
the
first
4
divisions
as
flat
as
possible.
Adjust
VR25
and
VC25
("CH
1"
-
VERT
PCB)
for
minimum
ringing
and
overshoot
and
the
first
2
divisions
as
flat
as
possible.
As
adjustment
1
and
2
are
slightly
interdependent,
repeat
some
times
for
optimum
results.
Repeat
for
channel
B.
Repeat
for
channel
B
by
means
of
VR147-VC147
and
VR125-VC125
("CH
2"
-
VERT
PCB).
1
kHz
square-wave
response
adjustment
TEST
EQUIPMENT
SETTING
REQUIREMENTS
ADJUSTMENT
1
ADJUSTMENT
2
SETTING
ADJUSTMENT
Square-wave
calibration
generator.
Vertical
mode
-
A
Channel
A
AMPL/DIV
-
0,1
V
for
adjustment
1, at
1
V
for
adjustment
2.
Apply
a
1
kHz
square-wave
signal
to
channel
A
and
set
the
amplitude
at
5
div.
Pulse
aberrations
must
be
<
5
%.
Adjust
VC5
(VERT
PCB)
for
minimum
over-
and
undershoot
at
AMPL/DIV
-
0,1
V.
Adjust
VC8
(VERT
PCB)
for
minimum
over-
and
undershoot
at
AMPL/DIV
-
1
V.
Repeat
for
channel
B.
Repeat
for
channel
B
by
means
of
VC105
and
VC108
(VERT
PCB).
5.3
PERFORMANCE
CHECK
AND
ADJUSTMENT
PROCEDURE

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