Philips PM 3218 User manual

PHILIPS
PHILIPS
\ MAT 312
Instruction manual
Geratehandbuch
Mode d’emploi
35 MHz Dual channel oscilloscope
35 MHz Zweikanal-Oszilloskop
Oscilloscope 35 MHz a double trace
PM 3218
9444 032 18..1
9499 443 00102 190625

IMPORTANT
In
correspondence
concerning
this
instrument,
please
quote
the
type
number
and
serial
number
as
given
on
the
type
plate.
WICHTIG
Bei
Schriftwechsel
Uber
dieses
Gerat
wird
gebeten,
die
genaue
Typenbezeichnung
und
die
Gerdtenummer
anzugeben.
Diese
befinden
sich auf
dem
Leistungsschild.
IMPORTANT
RECHANGE DES PIECES DETACHEES (Réparations)
Dans
votre
correspondance
et
dans
vos
réclamations
se
rapportant
a
cet
appareil,
veuillez
TOUJOURS
indiquer
le
numéro
de
type
et
le
numéro
de
série
qui
sont
marqués
sur
la
plaquette
de
Caractéristiques.
Note:
The
design
of
this
instrument
is
subject
to
continuous
development
and
improvement.
Consequently,
this
instrument
may
incorporate
minor
changes
in
detail
from
the
information
contained
in
this
manual.
Bemerkung:
Die
Konstruktion
und
Schaltung
dieses
Gerats
wird
standig
weiterentwickelt
und
verbessert.
Deswegen
kann
dieses
Gerat
von
den
in
dieser
Anleitung
stehenden
Angaben
abweichen.
Remarques:
Cet
appareil
est
l’objet
de
développements
et
améliorations
continuels.
En
conséquence,
certains
détails
mineurs
peuvent
différer
des
informations
données
dans
la
présente
notice
d’emploi
et
d‘entretien.
©
N,V.
PHILIPS’
GLOEILAMPENFABRIEKEN
—
EINDHOVEN
—
THE
NETHERLANDS
—
1979
PRINTED IN THE NETHERLANDS

Contents
1.1,
1.2.
1.2.1,
1.2.2.
1.2.3.
1.2.4,
1.2.5,
1.2.6.
1.2.7,
1.2.8.
1.2.9.
1.2.10.
1.2.11.
1.2.12.
1.2.13.
1.3.
1.3.1.
1.3.2.
1.4.
1.4.1.
1.4.2.
1.4.3.
1.4.4,
1.4.5.
1.4.6.
1.4.7,
1.48.
1.4.9.
2.1.
2.1.1.
2.1.2.
2.1.3.
2.1.4.
2.2.
2.2.1.
2.2.2.
2.2.3.
2.2.4,
2.2.5,
2.2.6.
2.3.
2.3.1.
2.3.2.
2.3.3.
GENERAL INFORMATION
INTRODUCTION
CHARACTERISTICS
C.R.T.
Vertical or Y-axis
Horizontal or X-axis
Main time base
Delayed time base
X Deflection
Triggering of the main time base
Triggering of the delayed time base
Calibration generator
Power supply
Environmental characteristics
Mechanical data
Z-mod input
ACCESSORIES
Supplied with the instrument
Optional
BLOCK DIAGRAM DESCRIPTION
Y Channel
Main time-base triggering
Main time-base circuit
Hold-off circuit
Z-axis
Delayed time-base triggering
Delayed time-base circuit
Alternate time-base logic
Power supply
DIRECTIONS FOR USE
INSTALLATION
Safety regulations
Local mains connection and fuse protection
Connection to an external supply
Front cover and instrument positions
CONTROLS AND SOCKETS
Cathode-ray tube and POWER controls
Vertical channels
Horizontal channel
Main time-base generator
Delayed time base generator
Miscellaneous
OPERATING INSTRUCTIONS
Switching on the instrument
Preliminary settings of the controls
Input coupling (AC/DC, 0)
10
10
10
11
11
11
12
12
12
12
13
13
13
13
14
14
14
15
15
15
15
15
15
16
16
16
16
17
17
17
17
18
18
18
18
19
19
20
21
21
22
22
22
22

2.3.4. Use of probes 22
2.3.5. Adjustment of attenuator probes 23
2.3.6. Selection of chopped or alternate modes 23
2.3.7. Differential mode 3 24
2.3.8. Selection of trigger mode 24
2.3.9. Triggering source 25
2.3.10. Time-base magnifier 26
2.3.11.
Hold-off
26
2.3.12,
XY-measurements
26
2.3.13.
Using
the
delayed
time
base
26
2.4. PROCEDURES REQUIRED FOR THE REMOVAL OF FUSES, BEZEL AND CONTRAST PLATE 27
2.4.1. Removing the instrument covers 27
2.4.2. Removing the mains transformer 28
2.4.3. Replacing the thermal fuse F101 29
2.4.4. Replacing the fuse F201 29
2.4.5. Removing the bezel and the contrast plate 29
3. SERVICE DATA 75
FIGURES
35MHz dual-channel oscilloscope PM3218 9
1.2. Dimensions 14
Block diagram 14
2.1. Rear view of the oscilloscope showing the voltage adapter set to 220 V 17
2.2. Front view of the oscilloscope showing controls and sockets 18
2.3. Adjusting an attenuator probe 23
2.4. Suppression of common mode signals 24
2.5. Block diagram of composite trigger circuit 25
2.6. Removing the instrument covers and the carrying handle 27
2.7. Replacing the thermal fuse 28
2.8. Replacing the thermal fuse 28
2.9. Removing the bezel and the contrast plate 29

Inhalt
1.1.
1.2.
1.2.1.
1.2.2.
1.2.3.
1.2.4,
1.2.5.
1.2.6.
1.2.7.
1.2.8.
1.2.9.
1.2.10.
1.2.11.
1.2.12.
1.2.13.
1.3.
1.3.1.
1.3.2.
1.4.
1.4.1.
1.4.2.
1.4.3.
1.4.4.
1.4.5,
1.4.6.
1.4.7.
1.4.8.
1.4.9.
2.1.
2.1.1,
2.1.2.
2.1.3.
2.1.4.
2.2.
2.2.1.
2.2.2.
2.2.3,
2.2.4.
2.2.5,
2.2.6.
2.3.
2.3.1.
2.3.2.
2.3.3,
ALLGEMEINES
EINLEITUNG
TECHNISCHE DATEN
Elektronenstrahlrohre
Vertikale oder Y-Achse
Horizontale oder X-Achse
Hauptzeitablenkung
Verz6gerte Zeitablenkung
X-Ablenkung
Triggerung der Hauptzeitablenkung
Triggerung der verzOgertenzeitablenkung
Kalibriergenerator
Stromversorgung
Einflussgrossen
Mechanische Daten
Z-achsen steuerung
ZUBEHOR
Standardzubehor
Wahlzubehor
BLOCKSCHALTBILDBESCHREIBUNG
Y-Kanal
Triggerung der Hauptzeitablenkung
Haupzeitablenkschaltung
Sperrschaltung
Z-Achse
Triggerung der verzdgerten Zeitablenkung
Schaltung der verzdgerten Zeitablenkung
Alternierende Zeitablenk-Logik
Speisung
GEBRAUCHSANLEITUNG
INBETRIEBNAHME
Sicherheitsvorschriften
Ortlicher Netzanschluss und Sicherung
Anschluss an eine externe Stromversorgung
Abdeckhaube und Betriebslage
BEDIENUNGSELEMENTE UND BUCHSEN
Elektronenstrahirohre und POWER-Einstellelemente
Vertikale Kanale
Horizontaler Kanal
Hauptzeitablenkgenerator
Verzogerter zeitablenkgenerator
Verschiedenes
BEDIENUNGSANLEITUNG
Einschalten des Gerats
Vorbereitende Einstellungen
Eingangskopplung
31
31
32
32
32
33
33
33
34
34
34
34
35
35
35
35
36
36
36
37
37
37
37
37
37
38
38
38
38
39
39
39
39
40
40
40
40
41
41
42
42
43
44
44
44
44
ed

2.3.4. Anwendung von Messkdpfen
2.3.5. Ejinstellen der Abschwacher-Messkopfe
2.3.6. Ejinstellen der geschoppten oder der alternierenden Darstellungsart
2.3.7. Differentielle betriebsart
2.3.8. Ejinstellen der Triggerart
2.3.9. Triggerquelle
2.3.10. Dehnung der Zeitablenkung
2.3.11. Einstellen der Sperrzeit
2.3.12. XY messungen
2.3.13. Gebrauch der verzégerten zeitablenkung
2.3.11. XY messungen
2.3.12. Gebrauch der verzdgerten zeitablenkung
2.4. VERFAHREN ZUM ENTFERNEN VON SICHERUNGEN, BILDROHRENRAHMEN UND KONTRAST-
PLATTE
2.4.1. Abnehmen der Abdeckhauben
2.4.2. Ausbau des Netztransformators
2.4.3. Ersetzen der Schmelzsicherung F101
2.4.4. Ersetzen der Sicherung F201
2.4.5. Abnehmen des Bildrohrenrahmens und der Kontrastplatte
3. SERVICE DATEN (nur aufs Englisch)
ABBILDUNGEN
1.1. 35 MHz Zweikanal-Oszillograf PM3218
1.2. Abmessungen
2.1. Ruckansicht des Oszillografen mit Spannungsumschalter in 220 V Stellung
2.2. Vorderansicht des Oszillografen mit Bedienungsorganen und Buchsen
2.3. Einstellen des Abschwacher-Messk opfs
2.4, Gleichtak tunterdrickung
2.5. Blockschaltbild der zusammengesetzte (composite) Triggerschaltung
2.6. Abnehmen der Geradtabdeckhauben und des Tragbugels
2.7. Ersetzen der Schmelzsicherung
2.8. Ersetzen der Schmelzsicherung
2.9. Abnehmen des Bildr6éhrenrahmens und der Kontrastplatte
44
45
45
46
46
47
48
48
48
48
48
48
49
49
50
51
51
51
75
31
36
39
40
45
46
47
49
50
50
51

Table des matiéres
1.1.
1.2.
1.2.1.
1.2.2.
1.2.3.
1.2.4,
1.2.5,
1.2.6.
1.2.7.
1.2.8.
1.2.9.
1.2.10.
1.2.11.
1.2.12.
1.2.13.
1.3.
1.3.1,
1.3.2.
1.4,
1.4.1,
1.4.2.
1.4.3.
1.4.4,
1.4.5,
1.4.6.
1.4.7,
1.4.8.
1.4.9,
2.1.
2.1.1.
2.1.2.
2.1.3,
2.1.4.
2.2.
2.2.1.
2.2.2.
2.2.3.
2.2.4,
2.2.5.
2.2.6.
2.3.
2.3.1.
2.3.2.
2.3.3,
GENERALITES
INTRODUCTION
CARACTERISTIQUES
Tube cathodique
Axe vertical ou Y
Axe X ou horizontal
Base de temps principale
Base de temps retardée
Déviation X
Déclenchement de la base de temps principale
Déclenchement de la base de temps retardée
Générateur d’étalonnage
Alimentation
Conditions ambiantes
Caractéristiques mécaniques
Entreé modulation-Z
ACCESSOIRES
Fournis avec |’instrument
En option
DESCRIPTION DU SCHEMA SYNOPTIQUE
Voie Y
Déclenchement de la base de temps principale
Circuit de base de temps principale
Circuit de blocage
Axe Z
Déclenchement de la base de temps retardée
Circuit de base de temps retardée
Logique de base de temps alternée
Alimentation
MODE D’EMPLOI
INSTALLATION
Réglements de sécurité
Branchement sur le secteur et fusibles
Branchement sur une alimentation extérieure
Couvercle avant et position de l’instrument
COMMANDES ET PRISES
Tube cathodique et commandes de puissance
Déviation verticale
Déviation horizontale
Générateur de base de temps principale
Générateur de base de temps retardée
Divers
INSTRUCTIONS D’‘UTILISATION
Mise de I’instrument en circuit
Réglage préliminaire des commandes
Couplage d’entrée
53
53
54
55
55
55
56
56
56
57
57
57
57
57
58
58
58
59
59
59
59
59
59
60
60
60
60
61
61
61
61
62
62
62
62
63
63
64
65
65
66
66
66
66

2.3.4. Emploi des sondes
2.3.5. Réglage des sondes atténuatrices
2.3.6. Choix entre modes commuteé et alterné
2.3.7. Mode différentiel
2.3.8. Choix du mode de déclenchement
2.3.9. Source de déclenchement
2.3.10. Agrandisseur de base de temps
2.3.11. Réglage de blocage
2.3.12. Messures XY
2.3.13. Utilisation de la base de temps retardée
2.4. PROCESSUS REQUIS A LA DEPOSE DE FUSIBLES, VISIERE ET PLAQUE DE CONTRASTE
2.4.1. Dépose des couvercles
2.4.2. Dépose du transformateur secteur
2.4.3. Remplacement d‘un fusible thermique F101
2.4.4. Remplacement du fusible F201
2.4.5. Dépose de la visidre et de la plaque de contraste
3. NOTICE DE SERVICE (seulement en Anglais)
FIGURES
1.1. Oscilloscope 35 MHz a double trace PM3218.
4.2. Dimensions
2.1. Vue arriére de !’oscilloscope avec carrousel en position 220 V
2.2. Vue avant de |’oscilloscope montrant les commandes et douilles
2.3. Ajustage d’une sonde atténuatrice
2.4, Réjection en mode commun
2.5. Schéma synoptique du circuit de déclenchement mixte
2.6. Dépose des couvercles et de la poignée de !‘appareil
2.7. Remplacement d’un fusible thermique
2.8. Remplacement d'un fusible thermique
2.9. Dépose de !a visiére et de la plaque de contraste
66
67
67
68
68
69
70
70
70
70
71
71
72
73
73
73
75
53
58
61
62
67
68
69
71
72
72
73

1.
1.1
General information
INTRODUCTION
The
35
MHz
dual-channel
oscilloscope
PM
3218
is
a
compact,
portable
instrument,
ergonomically
designed
to
facilitate
its
extensive
measuring
capabilities.
The
instrument
provides
both
a
main
and
a
delayed
timebase
with
provision
for
alternate
timebase
displays,
comprehensive
triggering
facilities
including
peak-to-peak
Auto,
DC
coupling
and
automatic
TV
waveform
display.
A
targe
8
x
10
cm
screen
with
illuminated
internal
graticule
lines
makes
for
easier
viewing,
and
a
10
kV
accelerating
potential
gives
a
high
intensity
trace
with
a
well-defined
spot.
A
double-insulated
power
supply
allows
the
frame
ground
to
be
directly
connected
to
floating
ground
circuits
provided
that
this
ground
does
not
carry
live
potentials.
By
this
means,
interference
by
ground
currents,
as
is
frequently
experienced
with
grounded
oscilloscopes,
is
also substantially
reduced.
The
wide
range
of
applications
enabled
by
the
above
features
is
further
extended
by
a
versatile
power
supply
that
enables
the
instrument
to
be
operated
from
different
line
voltages
as
well
as
from
d.c.
For
field
operation
an optional
battery
version
is
also available.
Warning:
The
frame
ground
(and
the
ground
lead
of
the
probe)
must
not
be
connected
to
live
potentials.
MAT 312
Fig. 1.1. 35 MHz dual-channel oscilloscope PM3218
1
|

10
1.2.
1.2.1
1.2.2
CHARACTERISTICS
This instrument has been designed and tested according to [EC Publication 348 for Class II instruments and
has been supplied in a safe condition. The present Instruction Manual contains information and warnings
which shall be followed by the purchaser to ensure safe operation and to retain the instrument in a safe condition.
Properties expressed in numerical values with stated tolerances are guaranteed for ambient temperatures of
+5 °C ... +40 °C unless stated otherwise. Numerical values without tolerances are typical and represent the
characteristics of an average instrument. The data apply after a warming-up period of 30 minutes.
Designation
C.R.T.
Type
Measuring area
Screen type
Total acceleration
Graticule
Engravings
Vertical or Y-axis
Display modes
Channel B polarity
Response:
Frequency range
Rise time
Pulse aberrations
Deflection coefficients
Continuous contro} range
Deflection accuracy
Input impedance
Input RC time
Maximum permissible input
voltage
Chopping frequency
Vertical positioning range
Dynamic range
Visible signal delay
C.M.R.R. in A-B mode
Cross talk between channels
Instability of the spot position:
Temperature drift
Specification
D14-125 GH/08
8 x 10 divisions
P31 (GH)
10 kV
Internal
Centimetre divisions with
subdivisions of 2mm along
the central axes. Dotted
lines indicate 10% and 90%
of measuring lattice fer
measurement of rise time.
Channel A only
Channel B only
A and B chopped
A and B alternating
A and B added
Normal or inverted
DC: 0.... 35 MHz (-3dB)
AC: 2 Hz .... 35 MHz (-3dB)
< 10ns
< +3% (<4% pp)
2mV/DIV .... 10 V/DIV
1:22)5
+3%
1 M&2/20 pF
0,15
400 V, d.c. + a.c. peak
= 500 kHz
16 divisions
24 divisions
> 2 divisions
= 40 dB at 1 MHz
-40 dB or better at 10 MHz
< 0,3 div/hour
Additional Information
Rectangular tube face, mesh type,
post accelerator, metal backed
phosphor.
1 div. equals 1 cm
P7 (GM) optional
Cont. variable illumination
Measured at 6 div. amplitude and
applied rise time of 2 1 ns.
1-2-5 sequence
Coupling switch to AC
At 10ns
After adjustment at d.c. or low
frequencies
Both attenuators in the same setting

1.2.3
1.2.4
1.2.5
Horizontal or X-axis
Horizontal deflection can be obtained from either the Main time base or the Delayed time base or a combi-
nation of the two, or from the signal source selected for X-deflection. In this case X-Y diagrams can
be displayed using A, B, the Ext input connector, or Line as a signal source for horizontal deflection.
Display modes
Main time base
Operation
Time coefficients
Continuous control range
Coefficient error
Magnification
Max. effective time
coefficient
Delayed time base
Operation
Time coefficients
Continuous control range
Coefficient error
Delay time
Incremental delay time
accuracy
Delay time jitter
— Main time base
— Main time base intensified
by delayed time base
— Main time base and delayed
time base alternately displayed
— Delayed time base
— XY or XY/Y operation
Automatic
Triggered
0,5 s/DIV ..... 0,1 ps/DIV
1:22,5
+ 3%
10x
10 ns/DIV
Delayed time base either
starts immediately after
delay time or is triggerable
after the delay time, by the
selected delayed time base
trigger source
1ms/DIV — 0,1 us/DIV
1:225
+ 3%
In steps variable with main
time base.
Continuously variable with
10-turn potentiometer
between 0 x and 10 x the
time coefficient of the
main time base
0,5%
1: 2 20.000
14
X deflection by:
— Channel A signal
— Channel B signal
— Signal applied to EXT connector of
main time base
— Line frequency
Possibility of automatic free-running
in the absence of triggering signals
1-2-5 sequence
+ 5% including x10 magnifier
1-2-5 sequence

1.2.6
1.2.7
1.2.8
1.2.9
Designation
X Deflection
Source
Deflection coefficients
Deflection accuracy
Frequency range
Phase shift
Dynamic range ~
Triggering of the main time base
Source
Trigger mode
Trigger sensitivity
Triggering frequency range
Level range
Triggering slope
Input impedance
Maximum permissible
input voltage
Hold-off time
Triggering of the delayed time base
Source
Other
trigger
specifications
are
identical
to
‘triggering
of
the
main
time
base”
with
the
exception
of
the
Specification
A, B, EXT, EXT = 10 or LINE
A or B: As selected by
AMPL/DIV
EXTERNAL : 0,2 DIV
EXT + 10: 2V/DIV
LINE 8 divisions at nominal line
voltage.
+ 10%
DC: Q..... 1 MHz (-3 dB)
over 6 divisions
<3° at 100 kHz
24 divisions
Ch. A, Ch. B, Composite,
External + 10 and line
Automatic, normal AC
normal DC, TV-line
and TV frame
Internal: 0,5 div (DC ......... 5 MHz)
1 div (DC ......... 50 MHz)
External : 150 mV (DC........... 5MHz)
200 mV (DC .......... 50MHz)
Ext.+10:1,5V (DC... 5MHz)
2V (DG sicrec. 50MHz)
AUTO: 20 Hz..... > 50 MHz
AC: 5 Hz..... = 50 MHz
DC: 0 Hz..... = 50 MHz
AUTO: Proportional to
peak-to-peak value of
trigger signal.
AC, DC: 16 div. at Internal
trigg., 3,2 V at external
trigg., and 32V at ext. + 10
+ or —8 div and
Positive or negative going
1 MQ2//20 pF
400 V,d.c. + a.c. peak
variable
chA, chB, Composite,
External, MTB.
trigger modes EXT. + 10, TV and AUTO.
Calibration generator
Output voltage
Accuracy
Frequency
1,2 Vpp
+ 1%
= 2kHz
Square wave
Additional information
As selected by trigger source switch,
if push-button X DEFL. is depressed
For frequencies < 100 kHz
tor —1,6V referenced to centre of screen
+ or —16V referenced to centre of screen

1.2.10
1.2.11.
1.2.12
Designation
Power supply
AC supply:
Nominal voltage range (on
line-mains voltage adaptor)
Nominal frequency range
Power consumption
DC supply:
Voltage range
Current consumption
Capacity to earth
Environmental characteristics
13
Additional Information
Specification
Double insulated
110, 127, 220 or 240 Vac
Safety class Il, IEC 348
+ 10%
50 ..... 400 Hz + 10%
30 W max. At nominal mains voltage
22-27 V dc Floating input
20-28 V with relaxed specifications
1,1 A max.
185
pF
Measured
with
rubber
feet
on
grounded
metal
plate
of 1
m2
27
pF
Measured
30
cm
above
grounded
plate
of 1m2
The environmental data are valid only if the instrument is checked in accordance with the offical checking
procedure. Details on these procedures and failure criteria are supplied on request by the PHILIPS
organisation in your country, or by N.V. PHILIPS’ GLOEILAMPENFABRIEKEN, TEST AND MEASURING
DEPARTMENT, EINDHOVEN, THE NETHERLANDS.
Ambient temperatures :
Rated range of use
Operating
Storage and transport
Altitude:
Operating to
Non-operating to
Humidity
Shock
Vibration
Electromagnetic interference
Safety
Mechanical data
Dimensions:
Length
Width
Height
Weight
+ 5°C ... +40°C
—10°C ... +55°C
—40°C ... +70°C
5000 m (15000 ft)
15000 m (45000 ft)
21 days cyclic damp heat 25°C —40°C, R.H. 95%
30g:
half
sinewave
shock
of
11ms
duration:
3
shocks
per
direction for a total of 18 shocks
Vibrations
in
three
directions
with
a
maximum
of
15
min.
per
direction,
5
—
55
Hz
and
amplitude
of
0.7MM55
and
49
max.
acceleration.
Unit
mounted
on
vibration
table
without
shock
absorbing
material.
Meets
VDE
0871
and
VDE
0875
Grenzwertklasse
B.
The
isolation
between
the
oscilloscopes
and
line
fulfills
the
safety
requirements
of
1EC
348
for
metal
encased
class
IJ
instruments.
445 mm Handle and controls excluded
335 mm Handle excluded
137 mm Feet excluded
8,4 kg (18,5 Ib) approx.
1.2.13. Z-mod input TTL compatible 0” blanks display “1’’ normal intensity see chapter 3.6.

AC
bc oO
Cy
A
AC
OC
AC
DC O
B
AC
oc
EXT. TRIG. OR
X DEFL.
COMP.
EXT. TRIG.
AMPL./DIV.
VAR
IMPEDANCE
CONVERTER
PRE-AMPL.
VERTICAL
AMPLIFIERS
A ALT CHOP ADD B
IOINIO I~
IMPEDANCE
CONVERTER
D
mM > = ae [ aa
Salama
tS Sse
AMPL/DIV.
VAR
——
B EXT LINE
TRIGGER
PRE-AMPL.
TRIGGER
PRE-AMPL.
PULL TO INVERT B
SWITCHING
AMPLIFIER
CHANNEL
SWITCHING
AMPLIFIER
MULTIVIB
CHOP
BLANKING
DELAY LINE
DRIVER
COMP
LOW PASS
FILTER
DELAY LINE
100n sec
MODULATOR
AND
OSCILLATOR
FINAL Y
AMPLIFIER
CONVERTER
BLOCK DIAGRAM PM3218
Fig. 1.3. Block diagram
F-02000
DELAYED TIME BASE
O
ky
Q
COMPARATOR
S27
6: DELAY TIME
INTENS Z-AMPLIFIER
Z-AXIS | __
ac
autooc
SLOPE
Z-mod
©
BLANKING
peti
TIME/DIV.
IC] VAR
trvetirve
t
{
ee Se iciar thats a als CG -
1
\ |
! MTB
TRIGGER
IMPEDANCE COMPARATOR 0 Pell sae
CONVERTER Tey
t
MAIN TIME BASE
1
{
TV SYNC : y
AUTO
SEPARATOR
LINE FRAME CONTREE ]
| d it 6
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|
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| I
|
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r TIME/DIV.
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|
| A H
|
|
DIB
‘ TRIGGER EP
IMPEDANCE COMPARATOR ae GENERATOR
HOLD OFF
V4
Y2
1
|
1
!
oT MTB XDEFL |
=
i
LALT TB:
SELECTOR
ALTERNATE
As
| x4
a
oe
ie
-1,5kV
t
Go
FOCUS eae
TRACE
SEPARATION
CAL
1,2Vp.p.
CALIBRATOR
B
LOGIC
X POS
PULL FOR X10
FINAL X x
MPLIFIER X2
~15kV
4
VOLTAGE
QUINTUPLER
POWER SUPPLY Hach
POWER ON BATTERY
SUPPLY
REGULATOR
MAT 323

JELAY LINE
¥100n sec
FINAL Y YI
AMPLIFIER Y2
ODULATOR
AND DEMODULATOR
SsCILLATOR
—>-_}
Z-AMPLIFIER
TIME/DIV.
VAR
eede ‘S)
(
{
MTB
SWEEP
GENERATOR
MAIN TIME BASE
CONTROL
'
AUTO |
HOLD OFF
TIME/DIV.
DTB
SWEEP
GENERATOR
‘ED TIME BASE
HOLD OFF
DELAY TIME |
TRACE
SEPARATION
ALTERNATE
TB
LOGIC
OTB MTB XDEFL.)
ae
LALT TB:
[SX DEFLECTION
SELECTOR
-1,5kV
4
FINAL X
AMPLIFIER
X POS
PULL FOR X10
POWER SUPPLY
Y 4 x
[
x2
1
|
© ”
FOCUS
AL
CALIBRATOR a
1.2Vp.p.
VOLTAGE +8.5kV
+8,5kV
QUINTUPLER
!LLUM
POWER ON
BATTERY
‘SUPPLY
MAT 323
14
1.3.
1.3.2.
13,7¢m
FEET EXCLUDED
46,5 em
MANDLE ANO CONTROLS
EXCLUDED
vy a2)
33.5c¢m HANOLE EXCLUDED
je
S
———p>
MA
9813
Fig. 1.2. Dimensions
ACCESSORIES
Supplied with the instrument
Front cover
2 BNC 4 mm adaptor
2 Probes
Instruction manual
Optional
PM 8925 Passive probe set 10: 1 (1.5 m) 40 MHz
PM 8925L Passive probe set 10: 1 (2.5 m) 40 MHz
PM 8921 Passive probe set 1: 1 (1.5m) 15 MHz
PM 8921L Passive probe set 1: 1 (2.5 m) 15 MHz
PM 8940 Isolation amplifier
PM 8943 1: 1,10: 1 and 100: 1 650 MHz FET-probe
PM 9355 Current probe
PM 8910 Polaroid anti-glare filter
PM 9380 Oscilloscope camera
PM 8971 Camera adaptor
PM 8962 19” Rack mount adaptor
PM 9366 Collapsible viewing hood
PM 8980 Closed long type viewing hood
PM 8901 Rechargeable battery pack 330 V d.c./24 V d.c.
PM 8991 Trolley
PM 8992/01 Accessory pouch
Trimming tool kit
See also Chapter 3.5. "INFORMATION CONCERNING ACCESSORIES”.

1.4.
1.4.1,
1.4.2.
1.4.3.
1.4.4.
1.4.5.
15
BLOCK DIAGRAM DESCRIPTION (Fig. 1.3.)
Y Channel
The
vertical
channels
A
and
B
for
the
signals
to
be
displayed
are
identical,
each
comprising
an
input
coupling
switch,
an
input
step
attenuator,
an
impedance
converter
and
a
preamplifier
with
trigger
pick-off.
A
channel
multivibrator,
controlled
by
the
display
mode
pushbuttons,
switches
either
channel
A
or
channel
B
to
the
final
Y
amplifier
via
the
delay
line.
The
channel
multivibrator
is
operated
by
a
pulse
at
the
end
of
the
sweep,
and
offers
an
uninterrupted
display
of
the
A
and
B
waveforms
in
the
ALT
mode.
In
the
ADD
position,
both
switching
amplifiers
couple
the
signals
through,
thus
adding
channels
A
and
B.
By
inverting
the
B
channel
amplifier
(PULL
TO
INVERT
8B)
the
A
—
B
mode
is
obtained.
The
AMPL/DIV
switches
provide
x
1
or
x
10
gain
control
of
the
preamplifier,
which
offers
in
conjunction
with
the
step
attenuator
a
full
range
of
deflection
coefficients
in
a
1-2-5
sequence.
Main time base triggering
To
initiate
sweeps,
trigger
signals
can
be
derived
from
the
A
and
B
vertical
channel
preamplifiers,
from
an
external
source,
or
internally
from
the
mains
supply
(LINE
triggering)
as
selected
by
the
trigger
source
switch.
Composite
triggering
(A
and
B
depressed)
is
derived
from
the
delay-line
driver
stage.
The
polarity
of
the
trigger
signal,
negative
or
positive-going,
on
which
the
display
will
start
is
determined
by
changing
the
output
polarity
of
the
impedance
converter.
With
the
AUTO
switch
depressed,
the
peak-to-peak
level
detector
comes
into
operation.
The
peak-to-peak
level
of
the
signal
then determines
the range
of
the
LEVEL
control.
With AC or DC depressed, the range of the LEVEL control is fixed.
in
the
TVL
and
TVF
modes
the
LEVEL
control
is
inoperative
and
the
TV
sync
separator
is
switched
into
circuit,
thus initiating
sweeps
with
line
or
frame
pulses
depending
on the setting
of
the TVL
and
TVF
switches.
Main time base circuit
For normal internal time base operation the horizontal amplifier is fed by sweeps from the time base circuit.
With AUTO depressed, in the absence of trigger signals, the output of the sweep generator is fed back via the
hold-off
circuit
and
gate
to
its
input.
This
causes
sweeps
to
free-run
and
a
resultant
trace
is
displayed
on
the
screen. As soon as the AUTO control circuit detects a trigger (i.e. a change in the output of the sweep-gating
logic) the sweep is fed back to the sweep-gating logic. This causes the circuit to revert to the normal triggering
mode in which sweeps are initiated only by trigger pulses at the input of the sweep-gating logic.
With
AC
or
DC
depressed,
AUTO
control
is
made
inoperative.
Sweeps
are
then
only
produced
provided
a
trigger
signal
is present
and
the
LEVEL control
appropriately
set.
The
display
can
be
magnified
in
the
horizontal
direction
by
increasing
the
gain
of
the
final
amplifier
by
a
factor
of
x10
(also
the X DEFL
mode).
When the X DEFL pushbutton of the horizontal selection switch is depressed, the sweep generator output to
the final amplifier is inhibited and the impedance converter is connected directly to the final amplifier. In thts
way, the signals normally selected for triggering, or an external source, can now be used for horizontal
deflection.
Hold-off circuit
The
hold-off
stage,
as
its
name
implies,
“holds-off”
triggers
from
the
input
of
the
time
base
circuit
until
the
trace
has
completely
returned
and
the
time
base
circuits
are
completely
reset.
The
hold-off
time
can
be
decreased
by
turning
the
HOLD-OFF
control
clockwise.
Z Axis
The
Z
amplifier
provides
for
the
blanking
of
the
trace
during
the
fly-back
and
hold-off
time.
In
addition,
it
blanks
the
sweep
in
the
CHOP
mode
during
the
switching
transients.
More
over
the
trace
can
be
blanked
by
a
signal
applied
to
the
external
Z-mod
input.
The
I.f.
components
of
the
blanking
signal
are
modulated
and
demodulated
before
they
are
applied
to
the
Wehnelt
cylinder
together
with
the
a.c.
coupled
h.f.
components.

16
1.4.6.
1.4.7.
1.4.8.
1.4.9.
Delayed time base triggering
To initiate sweeps, trigger signals can be derived from the A and B vertical channel preamplifiers, or from an
external source as selected by the trigger source push button switch.
With both the A and B pushbuttons depressed simultaneously, composite triggering is derived from the delay-
line driver stage of the Y amplifier channe!. AC and DC coupling is provided to the impedance converter. The
polarity of the trigger signal, negative or positive-going, on which the display will start, is determined by
changing the output polarity of the impedance converter by the SLOPE switch.
With MTB selected, the delayed time base starts directly after the delay time. The DELAY TIME control in
conjunction with the comparator determines the delay time for the delayed time base generator.
Delayed time base circuit
The delayed time base is operative unless its TIME/DIV switch is in the OFF position. It starts immediately
after the delay time, or upon receipt of the first trigger pulse after the delay time.
The sawtooth signal derived from the main time base sweep generator is passed to a comparator where it is
compared with an accurately adjustable d.c. voltage, controlled by the DELAY TIME control.
The comparator output is pulse-shaped and provides the required delay pulse for the sweep-gating logic of the
delayed time base generator. A sawtooth voltage is then initiated.
The delayed sweep is reset by the hold-off circuit of the delayed time base (end of the sweep detection) or by
the main time base.
It can be started again by the output signal of the comparator after the initiation of the next main time base
sweep.
When pushbutton MTB of the horizontal! deflection mode controls is selected, the part of the trace coinciding
with the delayed sweep is intensified.
Alternate time base logic
In ALT TB mode an electronic switch enables main time base display and delayed time base display to be
alternately traced on the screen.
The two displays can be separated by varying the voltage applied to the vertical amplifier, derived from the
driving circuits of the electronic switch. This separation is symmetrically variable by means of the TRACE
SEPARATION control on the front panel.
In the ALT TB mode the vertical channel multivibrator is controlled by a signal derived from the electronic
switch.
In
the
vertical
and
horizontal
ALT
modes,
successively
are
displayed
on
the
screen,
Channel!
A
and
main
time
base,
Channel
A
and
delayed
time
base,
Channe!
B
and
main
time
base,
Channe!
B
and
delayed
time
base.
Power supply
The mains (line) supply is transformed and rectified before being applied to a d.c. to a.c. converter.
When the instrument is operated from a battery supply, the battery output is connected directly to the d.c.
to a.c. converter.
The
output
of
the
regulator
is
coupled
to
a
transformer
and
rectifier
which,
after
rectification,
provides
the
—1.5
kV potential and
the
circuit
supply
voltages. The
—1.5
kV
is also
muitiplied
to
8.5 kV
to
supply
the
required
total
accelerating
voltage
of
~ 10
kV.

17
2. Directions for use
2.1
2.1.1
2.1.2
INSTALLATION
Safety regulations (in accordance with IEC 348)
Before
connecting
the
instrument
to
the
mains
(line),
visually
check
the
cabinet,
controls
and
connectors
etc.
to
ascertain
whether
any
damage
has
occurred
in
transit.
If
any
defects
are
apparent,
do
not
connect
the
instrument
to
the
mains
(line).
The
instrument
must
be
disconnected
from
all
voltage
sources
and
any
high
voltage
points
discharged
before
any
maintenance
or
repair
work
is
carried
out.
If
adjustments
or
maintenance
of
the
operating
instrument
with
covers
removed
is
inevitable,
it
must
be
carried
out
only
by
a
skilled
person
who
is
aware
of
the
hazards
involved.
In
normal
operation
the
double-insulated
power
supply
obviates
the
need
of
a
safety
ground.
Warning:
{t
must
be
borne
in
mind
that
in
all
measurements
the
frame
ground
of
the
oscilloscope
is
raised
to
the
same
potential
as
that
of
the
measuring
ground
probe
connection.
Neither
the
a
probe’s
ground
lead
nor
the
frame
ground
shall
be
connected
to
live
potentials.
Local mains (line) connection and fuse protection
Before
connecting
the
instrument
to
the
mains
(line)
ensure
that
it
is
set
to
the
local
mains
(line)
voltage.
On
delivery
the
instrument
is
set
to
220
V.
If
the
instrument
is
to
be
used
with
110
V,
127
V
or
240
V
supply,
the
appropriate
voltage
should
be
selected
by
turning
the
adaptor
on
the
rear
panel
to
indicate
the
voltage
required
(see
Fig.
2.1).
The
instrument
is
protected
from
overloads
by
a
thermal
fuse
fitted
between
the
mains
(line)
transformer
windings.
It
can
be replaced
after
having removed
the
instrument
rear
panel
(see
section
2.4.)
Perc. PM S248.
9684 Cal B00:
MAT 315
Fig. 2.1. Rear view of the oscilloscope showing the voltage adapter set to 220 V.

18
2.1.3. Connection to an external supply
An external supply or battery of 22 V to 27 V capable of delivering at least 1 A can be connected to the
socket on the rear panel. (DC Power input cord set: 4822 321 20125).
The inner conductor must be connected to the negative pole and the outer conductor to the positive pole, as
indicated on the rear panel.
The instrument is protected against overloads and reversed polarity by an internal fuse and diode. This fuse
can be replaced after having removed the instrument rear panel (see section 2.4.).
2.1.4 Front cover and instrument position
The front cover can be simply removed by pulling it from the front.
The instrument may be used horizontally or in several sloping positions by using the carrying handle as a
tilting bracket.
To unlock the handle, simultaneously push in both pivot centre knobs.
2.2 CONTROLS AND SOCKETS (Refer to Fig. 2.2)
2.2.1 Cathode-ray tube and POWER controls
ILLUM
Continuously
variable
control
of
the
graticule
illumination;
POWER ON incorporates mains (line) switch. POWER ON pilot lamp indicates
the ON state.
INTENS Continuously variable control of the trace brilliance.
FOCUS Allows beam to be focused for minimum spot size.
TRACE ROTATION Screwdriver adjustment to align the trace with the horizontal
graticule lines.
non” PMI
8 at oauTO Be
peel ieee eek eed
i POSITION — 3 x POS LEVEL
He f
MAT 313
Fig. 2.2. Front view of the oscilloscope showing controls and sockets.

2.2.2
2.2.3
Vertical channels
Display mode switch
A — ALT — CHOP — ADD —8B
A
ALT
CHOP
ADD
POSITION
PULL TO INVERT B
AMPL/DIV (outer-knob)
AMPL/DIV (centre-knob)
Input coupling switch
AC/DC —0
AC (depressed)
DC (released)
0 (depressed)
A (1MQ//20pF)
B (1MQ//20pF)
Horizontal channel
X deflection source switch
DTB MTB — XDEFL
ALT TB
DTB
MTB
DTB MTB
LaALT Ta
X DEFL
19
Function ro
5-way
pushbutton
switch
selecting
the
vertical
display
mode.
With all buttons released, the ALT mode is in operation.
Vertical
deflection
is
achieved
by
the
signal
connected
to
the
input
of
channel
A.
The display
is
switched
over
from
one
vertical
channel
to
the
other
at
the
end
of
every
cycle
of
the
timebase
signal.
The display is switched over from one vertical channel to the other
at a fixed frequency. (f ~ 500 kHz)
Vertical deflection is achieved by the sum signal of channels A and B.
Vertical deflection is achieved by the signal connected to the input
of channel B.
Continuously variable controls giving vertical shift of the display.
Push-pull switch combined with the channel B POSITION control.
When pulled, channel B signal is inverted.
Step control of the vertical deflection coefficients, ranging from
2 mV /div up to 10 V/div in a 1-2-5 sequence.
Continuously variable contro! of the vertical deflection coefficients.
Note that the deflection coefficient is calibrated only with the
centre-knob switched to the CAL position (fully-clockwise).
Signal coupling; 2-way pushbutton switch
Coupling via a blocking capacitor
Direct coupling
Connection between input circuit and input socket is interrupted and
the input circuit is grounded.
BNC socket for channel! A input
BNC socket for channel B input
Function
Horizontal-defiection controls; 3-way pushbutton switch
The horizontal deflection voltage is supplied by the delayed time-
base generator.
The horizontal deflection voltage is supplied by the main timebase
generator. A portion of the trace is intensified when the delayed
timebase is running.
The delayed timebase generator is switched off when the
DELD TIME/DIV switch is in the OFF position.
If no buttons are depressed the effect is the same as the MTB button
depressed (only the MTB LEVEL control is not operating in this
situation).
When both the DTB and MTB pushbuttons are selected simultaneously,
the horizontal deflection voltage is supplied by the main and delayed
timebases alternately.
Horizontal deflection is achieved by the channel A signal, the channel B
signal, the mainsfrequency signal or an external signa! applied to the
external input socket of the main time base.