Philips PM 3206 User manual

PHILIPS
L.F.
OSCILLOSCOPE
P M 3206
66 403
13.2-10
1i465j01

1
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PHILIPS
0
.,
PEM 747
L.F.
OSCILLOSCOPE
P
M
3206
66 403
13.2-10
1/465/01
Manual

2
Contents
GENERAL
PART
I.
Technical
data
II .
Accessories
DIRECTIONS FOR
USE
5
8
II I.
Installation
9
A.
Adjustment to local mains voltage
9
B. Earthing
10
C.
Connection to the mains
10
IV.
Operation
10
A.
Knobs
and
sockets
and their functions 10
B.
Switching on
10
C.
Input circuit of the
vertical amplifier 10
D. Making the
voltage shape visible
11
E.
Determining thetime 13
F.
Voltage
measurement 13
G.
Horizontal deflection
with an external voltage
13
H. Horizontal
deflection with
an
internal sinusoidal voltage
at mains frequency
14
I.
Horizontal
magnification 14
J. Brightness modulation
14
K.
Use
of the
calibrating
voltage
15
SERVICE DATA
V.
Description of the
working
principle 17
A. Introduction
17
B. Attenuator
17
C. Vertical amplifier
17
D. Trigger pulse shaper
18
E. Time -base
generator 18
F.
Horizontal amplifier
19
G. Cathode-ray tube
circuit 20

3
H. Calibration source
21
J. Power supply
21
VI.
How to gain access to the components
28
A. Removing
the cabinet
28
B.
Removing the knobs
29
C. Removing the protective cap and
the
measuring
graticule
29
VII. Replacing component parts
30
A. Replacing
the thermal fuse
30
B. Replacing the safety fuses
30
C.
Replacing the cathode-ray tube
31
VIII. Survey of adjusting points with relevant measuring equipment
32
IX.
Adjustments
34
A. Pre -adjustments and checks
34
B. Cathode-ray tube circuit
35
C. Vertical amplifier
35
D. Calibration voltage
38
E. Horizontal amplifier
38
F.
Time -base
generator
39
X.
Information
on fault-finding
43
XI.
List
of
component
parts 44
A. List of
mechanical
parts
44
B. List of electrical parts 46

4
List of Figures
1
Rear view
9
2 Controls
and their functions
11
3 View
of
side
controls
15
4 Block
diagram
of the oscilloscope
25
5
Removing
the
panels
28
6 Removing
the
knobs
29
7
Removing
the protective cap
and the
measuring
lattice 30
8 Turning the
cathode-ray tube
31
9 Response curves
37
10 Front view
S0
11 Right-hand
side
view
51
12 Rear view
52
13
Left-hand
side
view
53
14 Printed
-wiring
board
A
54
15
Printed
-wiring
board D 56
16
Printed
-wiring
board
E
55
17
Printed
-wiring
board F 57
18
Printed
-wiring
board
G
58
19
Printed
-wiring
board
H 59
20
Printed
-wiring
board
J
60
21
Printed
-wiring
board
L
61
22 Printed
-wiring
board
O 62
23
Printed
-wiring
board
P
63
24 Y Amplifier 65
25 Time -base
generator and
trigger pulse shaper
71
26
X
Amplifier and
cathode-ray
tube circuit 77
27 Supply part 83
28 Circuit diagram 85
IMPORTANT
In correspondence concerning this apparatus, please quote the type and
serial numbers
given on the type plate at the rear of the apparatus.

5
GENERAL
PART
Technical
data
0
Properties expressed in
numerical values with tolerances stated
are
guaranteed
by us.
Numerical values
without tolerances are
given
for
information purposes
omy
and
indicate the
properties of an
average
apparatus.
A. CATHODE-RAY
TUBE CIRCUIT
1.
Cathode-ray tube
a. useful
screen surface
b.
deflection
c. total
acceleration
voltage
d.
brightness control
2.
Brightness modulation
a.
voltage
required
b. input impedance
3. Mechanical
beam suppression
4.
Measuring
graticule
D10-12GL
8 x
6
cm
(31/a"
x
2 3 / $
")
symmetrical
2800 V
d.c.-coupled
30 V for frequencies up to 1 kc/s
600
kS2//25
pF
The be am is
suppressed
when a plug is
inserted
in
an
input socket. If this socket is subsequently
earthed,
the
trace reappears.
8
x
6 cm,
smallest
subdivision
2 mm. The
graticule illumination can be
regulated.
B. Y
AMPLIFIER (VERTICAL
DEFLECTIOl~
1.
Deflection factor
2. Frequency response
13
calibrated
steps :
0.002 -
0.01 - 0.02 - 0.05 -
0.1-0.2-0.5-1 -2-5-10-20-SOV/cm.
Tolerance ~ 3 %. Continuous adjustment is
possible between the steps (not
calibrated).
0-100
kc/s
(max.
drop 3 dB) for sensitivity
from -~-
2 mV/cm.
0-300 kc/s (max. drop
3
dB)
for
sensitivities
from
10
mV -50 V/cm.

6
The
band width is almost constant in
all
positions of the step
attenuator, but varies
slightly when the continuous
attenuator is
moved.
3.
Overshoot
4. Input
a.
input resistance
b. input capacity
c. max. permissible
d.c. voltage with
a.c.
coupling
G
CALIBRATING VOLTAGE
<_ 0.5 %for pulses with rise
times
>_
30 ns.
asymmetrical, d.c. or a.c.
coupled (switchable)
0.5
MS2
positions
0.01-0.02 and
0.05
V/cm: <_ 50
pF
other
positions: < 20
pF
300 V
(SOCKET "CAL.")
square -wave
voltage of
40
mVp_p (~
1 %),
frequency
equal to the mains frequency
D.
X
AMPLIFIER
(HORIZONTAL
DEFLECTION)
1.
Deflection factor
2.
Frequency
-response curve
3. Input
a. input impedance
b. max. input voltage
4. Horizontal -deflection
voltages, by selection
5. Magnification
a.
with horizontal
deflection
by means of
the
internal
time -base
b. with
horizontal
deflection by
means of
an
external voltage
1
V/cm
attenuation with continuous control and/or
fi
xed
attenuator 1 : 10 (2 input sockets)
0-300
kc/s
(-3 dB)
asymmetrical
1 :
1
-input: 100 k52//30
pF,
1 : 10 -input: 1.1
MS2//6
pF
1 : 1 -input:
100
V p
_ p ,
1 : 10 -input: 700
Vp_ p
a.
the internal time -base
voltage
b.
an
external voltage
c. an internal voltage
with
mains frequency
x
1 or
x 5, tolerance ~ 3 %,
with
respect to
the
"x
1" position
continuous
up
to 5
x
8 cm

7
E.
TIME
BASE
GENERATOR
1.
Sweep
times
2. Modes
of operation
3.
Triggering
a.
sensitivity, internal
b. sensitivity,
external
4.
Trigger level
5.
Output
voltage at
socket
"45 V ice/"
F.
SUPPLY
18 calibrated
times : 2 -
5 - 10 - 20 - 50 - 100 -
200-500µs/cm, 1 -2-5-
10-20-50- 100-
200 - 500
ms/cm,
1
s/cm, tolerance ~ 3 %.
When expanded
via the horizontal
amplifier
(5 x) the
shortest sweep time is 0.4
µs/cm. The
sweep times
can be
varied
continuously between
steps (not calibrated).
a. free -running
b. triggered
by selection, internally +
or — (L.F. or
H.F.),
externally -~
or —
(d.c.
or
H.F.) or internally
with
the mains
frequency ~-- or —
0.5 cm trace
height for frequencies
>_
1 c/s
1
Vp_p
for
frequencies from 0-300 kc/s input
impedance: 1
M52//40 pF
Max. external
triggering
voltage
is
3 V p
_p.
Trigger
level can be continuously adjusted
inter-
nally
across 6 cm
(2 3
/s")
picture height; exter-
nally across 12
V.
sawtooth
voltage of 42
Vp_p,
d.c. level -~-
20 V.
the
load
may be max. 0.1
MS2//35
pF,
Can
be
changed
over for mains
voltages of
110-127
and
220 V. The mains frequency
may
be
40-100 c/s. With mains
frequencies
G
50 c/s,
the
mains voltage must not exceed
the nominal
value.
The power consumption
is 135 W.
G.
INFLUENCE OF
MAINS -VOLTAGE
VARIATIONS OF ~ 10%
The
vertical and the
horizontal -deflection sens-
itivities
(sweep times) slightly vary at
mains
voltage
variations. The calibrating voltage,
however,
remains constant.

g
H. MECHANICAL DATA
Dimensions
height
30 cm
(1113/16")
width
21.5 cm
(8
x
/16)
depth
45 cm
(1'
S 3 /
a ")
Weight 14 kg
(30.86 lbs.)
Accessories
1
mains cable
1
manual
(Directions
for Use ~-- Service Notes)
1
measuring
cable,
length approx. 1 m,
with 4 -mm plugs at each
end.
i
i

9
DIRECTIONS FOR
USE
Installation
A. ADJUSTMENT
TO
LOCAL
MAINS
VOLTAGE
The apparatus can be
adjusted,
by means
of
a
voltage
adapter, to
mains
voltages of
110,
127 or 220 V.
The required
value
can be
read through
the
opening
in the rear
panel
(Fig. 1).
Adjustment to other mains voltages is
effected as
follows:
a. Remove the screws
"A" and detach the rear
panel.
b.
Pull out the adapter slightly, turn it until the
correct voltage is
upper-
most
and push
back.
c. Fit the
rear panel again.
BU
9
BU 10
BU
8
N
Fig.
1. Rear view
i
VL 2
i