Philips PM3055 User manual

60 MHz Dual Time Base Oscilloscope
PM3055
Service Manual
4822 872 05327
880411/2
WARNING: These servicing instructions are for use by qualified personnel only.
To reduce the risk of electric shock do not perform any servicing other
then that specified in the Operating Instructions unless you are fully
qualified to do so.

2
IMPORTANT: In correspondence concerning this instrument, please quote the type
number and serial number as given on the type plate.
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.
©N.V. PHILIPS GLOEILAMPENFABRIEKEN-EINDHOVEN-THE NETHERLANDS- 1988
PRINTED IN THE NETHERLANDS

CONTENTS Page
1.
SAFETY INSTRUCTIONS 1-1
1.1 Introduction 1-1
1.2 Safety precautions 1-1
1.3 Caution and warning statements 1-1
1.4 Symbols 1-1
1.5 Impaired safety-protection 1-2
1.6 General clauses 1-2
2, CHARACTERISTICS 2-1
2.1 Display 2-3
2.2 Vertical deflections or Yaxis 2-3
2.2.1 Channels Aand B2-3
2.2.2 Triggerview 2-5
2.3 Horizontal deflection or Xaxis 2-6
2.3.1 Main Time Base (MTB) 2-6
2.3.2 Delay Time Base (DTB) 2-6
2.3.3 X-deflection 2-7
2.3.4 EXT input 2-7
2.4 Triggering 2-8
2.4.1 MTB triggering 2-8
2.4.2 DTB triggering 2-9
2.5 Power supply 2-9
2.6 Auxiliary input or outputs 2-10
2.7 Environmental characteristics 2-10
2.8 Safety 2-12
3. INTRODUCTION TO CIRCUIT- AND BLOCK DIAGRAM DESCRIPTION 3-1
3.1 Introduction to circuit description 3-1
3.2 Block diagram description 3-10
3.2.1 Introduction 3-10
3.2.2 Control unit 3-10
3.2.3 Attenuator unit 3-10
3.2.4 Pre-amplifier unit 3-10
3.2.5 Time-base unit 3-12
3.2.6 XYZ unit ]‘3-12
3.2.7 Power supply unit 3-13

4
4. ATTENUATOR UNIT (A1) 4-1
4.1 Vertical attenuators 4-1
4.2 External input 4-2
5. PRE-AMPLIFIER UNIT (A2) 5-1
5.1 Vertical pre-amplifier 5-1
5.2 MTB trigger pre-amplifier 5-2
5.3 DTB trigger pre-amplifier 5-3
5.4 Pre-amplifier control 5-4
6. XYZ-AMPLIFIER UNIT (A3) 6-1
6.1 Introduction 6-1
6.2 Final vertical (Y) amplifier 6-1
6.3 Final horizontal (X) amplifier 6-1
6.4 Final blanking (Z) amplifier and CRT 6-2
7. TIME-BASE UNIT (A4) 7-1
7.1 Trigger amplifier 7-1
7.2 Timing circuit 7-2
7.3 Sweep generators 7-4
7.4 XDEFL amplifier, and display mode switch 7-6
7.5 Z-amplifier 7-6
7.6 Timing diagrams 7-8
8. CRT CONTROL UNIT (A5) 8-1
9. POWER SUPPLY UNIT (A6) 9-1
9.1 Input circuit 9-1
9.2 Converter circuit 9-1
9.3 Secondary output rectifiers 9-3
9.4 HT supply 9-3
9.5 Calibrator 9-3

FRONT UNIT (A7-A8) 10-1
10.1
10 .1.1
10 .1.2
10.1.3
10.1.4
10.1.5
10.1.6
10.1.7
10.1.8
Microcomputer control circuit
Introduction to MAB8052 microcomputer
Characteristics of the I^C bus
I^C structure
Microcomputer MAB8052
I^C decoding
Status input
Probe indicator
C-Bus decoder
10-1
10-1
10-1
10-2
10-3
10-4
10-5
10-5
10-5
10,2 LCD display circuit 10-5
10.3 Front-panel controls 10-6
PERFORMANCE CHECK 11-1
11.1 General information 11-1
11.2 Preliminary settings 11-2
11.3 Recommended test equipment 11-2
11.4 Checking procedure 11-3
11.4.1 Power supply 11-3
11.4.2 Display 11-3
11.4.3 Vertical deflection or Y-axis 11”4
11.4.4 Trigger view 11-10
11.4.5 Horizontal deflection or X-axis 11-13
11.4.6 MTB triggering 11-18
11.4.7 DTB triggering 11-20
11.4.8 Auxiliary inputs and outputs 11-22
DISMANTLING THE INSTRUMENT 12-1
12.1 General information 12-1
12.2 Removing the top and bottom covers 12-1
12.3 Access to parts for the checking and adjusting
procedures 12-1
CHECKING AND ADJUSTING 13-1
13.1 General information 13-1
13.2 Recommended test and calibration equipment 13-6
13.3 Survey of adjusting elements 13-7

13.4 Checking and adjusting procedure 13-9
13.4.1 Preparation 13-9
13.4.2 Power supply adjustment 13-9
13.4.3 CRT display adjustment 13-9
13.4.4 Square-wave response attenuator 13-10
13.4.5 Adjustment of vertical sensitivities 13-10
13.4.6 Adjustment of horizontal sensitivity 13-11
13.4.7 Offset adjustments 13-11
13.4.8 Adjustment of trigger sensitivity 13-12
13.4.9 Adjustment of the MTB sweep times 13-12
13.4.10 Adjustment of the DTB sweep times 13-12
13.4.11 Adjustment of xlO sweep times 13-13
13.4.12 Adjustment of delay time multiplier 13-13
13.4.13 Square-wave response of final Y-amplifier 13-13
13.4.14 Checking the AUTO SET function 13-14
CORRECTIVE MAINTENANCE 14-1
14.1 Replacements 14-1
14.1.1 Standard parts 14-1
14.1.2 Special parts 14-1
14.1.3 Transistors and Integrated Circuits 14-1
14.1.4 Static-sensitive components 14-2
14.1.5 Handling MOS devices 14-2
14.2 Removing the units and mechanical parts 14-3
14.2.1 Attenuator unit (Al) 14-3
14.2.2 Pre-amplifier unit (A2) 14-4
14.2.3 XYZ-amplifier unit (A3) 14-4
14.2.4 Time-base unit (A4) 14-4
14.2.5 CRT control unit (A5) 14-4
14.2.6 Power supply unit (A6) 14-5
14.2.7 Front unit (A7) and LCD unit (A8) 14-6
14.2.8 Removing the delay line cable 14-7
14.2.9 Replacement fo CRT 14-7
14.3 Soldering techniques 14-8
14.4 Instrument repacking 14-8
14.5 Trouble shooting 14-9
14.5.1 Introduction 14-9
14.5.2 Trouble-shooting techniques 14-9
14.5.3 Power-up routine 14-10
14.5.4 Trouble-shooting the power supply 14-11
14.5.5 P.c.b. interconnections 14-11
14.5.6 Signal waveforms 14-16
14.5.7 Semi conductor pinnings 14-16
14.6 Special tools 14-16
14.6.1 Trimming kit SBC 317 14-16
14.6.2 P.c.b. snapper 14-17
14.7 Recalibration after repair 14-17

7
15. SAFETY INSPECTION AND TEST AFTER REPAIR AND MAINTENANCE IN
THE PRIMARY CIRCUIT 15--1
15.1 General directives 15-]
15.2 Safety components 15-1
15.3 Checking the protective earth connection 15-1
15.4 Checking the insulation resistance 15~1
15.5 Checking the leakage current 15-1
15.6 Voltage test 15-2
16. PARTS LIST 16-1
16.1 Mechanical parts 16-1
16.2 Units 16-6
16.3 Cables and connectors 16-7
16.3.1 Flatcables and connectors 16-7
16.3.2 Pcb-connectors 16-7
16.3.3 Miscellaneous cables 16-7
16.4 Electrical parts 16-8
16.4.1 Capacitors 16-8
16.4.2 Resistors 16-11
16.4.3 Coils 16-16
16.4.4 Semi-conductors .16-16
16.4.5 Integrated circuits 16-18
16.4.6 Cathode ray tube 16-18
16.4.7 Miscellaneous 16-18
17. OPTIONS 17-1
17.1 Y-OUT 17-1
17.1.1 Characteristics 17-1
17.1.2 Circuit description 17-1
17.1.3 Adjusting and checking procedure 17-2
17.1.4 Parts list 17-3
17.2 MTB gate, DTB gate and MTB sweep 17-6
17.2.1 MTB gate 17-6
17.2.2 DTB gate 17-6
17.2.3 MTB sweep 17-6
17.2.4 Parts list 17-6

8
LIST OF FIGURES Page
Figure 2.1 Dimensions 2-2
Figure 3.1 Block diagram 3-6
Figure 4.1 Table of attenuator settings 4-X
Figure 4.2 Attenuator unit p.c.b. 4-3
Figure 4.3 Circuit diagram of attenuator, ch. A4-5
Figure 4.4 Circuit diagram of attenuator, ch. B4-6
Figure 4.5 Attenuator unit p.c.b. 4-8
Figure 4.6 Circuit diagram of attenuator, EXT 4-10
Figure 5.1 The three stages of the vertical pre-amplifier 5-1
Figure 5.2 Pre-amplifier unit p.c.b. 5-5
Figure 5.3 Circuit diagram of pre-amplifier, channel switch +
delay line driver 5-7
Figure 5.4 Circuit diagram of pre-amplifier, MTB trigger switch 5-8
Figure 5.5 Pre-amplifier unit p.c.b. 5-10
Figure 5.6 Circuit diagram of pre-amplifier, DTB trigger switch 5-12
Figure 5.7 Circuit diagram of pre-amplifier, logic control 5-14
Figure 6.1 XYZ amplifier unit p.c.b. 6-3
Figure 6.2 Circuit diagram of XYZ amplifier, final Xand Y
amplifiers 6-5
Figure 6.3 XYZ amplifier unit p.c.b. 6-6
Figure 6.4 Circuit diagram of XYZ amplifier, Zamplifier and
CRT circuit 6-8
Figure 7.1 D4103 configuration 7-2
Figure 7.2 Simplified diagram of the MTB 7-4
Figure 7.3 Z-logic for the different TB modes 7-7
Figure 7.4 Free-running MTB sweep-timing diagram 7-8
Figure 7.5 Triggered MTB-sweep with adelay sweep-timing diagram 7-8
Figure 7.6 Triggered MTB- and DTB-sweep-timing diagram 7-9
Figure 7.7 Time base unit p.c.b. 7-11
Figure 7.8 Circuit diagram of time-base, trigger amplifier MTB
and DTB 7-13
Figure 7.9 Circuit diagram of time base, MTB and DTB sweep
circuits and final XDEFL amplifier 7-
Figure 7.10 Time base unit p.c.b. 7-
Figure 7.11 Circuit diagram of time-base, Xpre-amplifier and
Zswitch 7-
Figure 8.1 Circuit diagram of CRT control 8-1
Figure 8.2 CRT control unit p.c.b. 8-1
Figure 9.1 Converter circuit 9-2
Figure 9.2 Timing diagram converter circuit 9-2
Figure 9.3 HT oscillator 9-3
Figure 9.4 Power supply unit p.c.b. 9-5
Figure 9.5 Circuit diagram of power supply 9-8

Figure 10.1 Bit transfer 10-1
Figure 10.2 Definition of start and stop conditions 10-2
Figure 10.3 l^C structure 10-2
Figure 10.4 Pinning of microcomputer MAB 8052 10-3
Figure 10.5 Front unit p.c.b. 10-6
Figure 10.6 Circuit diagram of front unit 10-8
Figure 10.7 LCD unit p.c.b. 10-9
Figure 10.8 Circuit diagram of LCD unit 10-10
Figure 12.1 Access to all parts for checking and adjusting 12-2
Figure 13.1 Adjusting elements 13-4
Figure 13.2 Square-wave response 13-14
Figure 14.1 Six clamping lips for XYZ-amplifier unit 14-4
Figure 14.2 Power supply unit outside the instrument 14-5
Figure 14.3 Measuring the front unit working condition 14-6
Figure 14.4 Removng the CRT 14-7
Figure 14.5 P.c.b. interconnections 14-13
Figure 14.6 14-16
Figure 14.7 Trimming tool kit 14-17
Figure 14.8 P.c.b. snapper 14-17
Figure 16.1 Exploded view 16-3
Figure 16.2 Rear view 16-5
Figure 16.3 Inside view showing the parts in the CRT compartment 16-5
Figure 16.4 View of the units 16-5
Figure 17.1 Y-OUT p.c.b. 17-4
Figure 17.2 Circuit diagram of Y-OUT option 17-5
Figure 17.3 Circuit diagram of MTB gate, DTB gate and MTB sweep
options 17-7
Figure 17.4 P.c.b. for MTB gate, DTB gate and MTB sweep 17-7

SAFETY INSTRUCTIONS
Read these pages carefully before installation and use of the
instrument.
INTRODUCTION
The following clauses contain information, cautions and warnings which
must be followed to ensure safe operation and to retain the instrument
in asafe condition.
Adjustment, maintenance and repair of the instrument shall be carried
out only by qualified personnel.
SAFETY PRECAUTIONS
For the correct and safe use of this instrument it is essential that
both operating and servicing personnel follow generally-accepted safety
procedures in addition to the safety precautions specified in this
manual.
Specific warning and caution statements, where they apply, will be
found throughout the manual.
V7h,ere necessary, the warning and caution statements and/or symbols are
marked on the apparatus.
CAUTION AND WARNING STATEMENTS
CAUTION: is used to indicate correct operating or maintentance
procedures in order to prevent damage to or destruction of
the equipment or other property.
WARNING: calls attention to apotential danger that requires correct
procedures or pracites in order to prevent personal injury.
SYMBOLS
High voltage >1000 V(red)
ALive part (black/yellow)
ARead the operating
instructions
Protective earth
(grounding) terminal (black)

1-2
1.5 IMPAIRED SAFETY-PROTECT ION
Whenever it is likely that safety-protection has been impaired, the
instrument must be made inoperative and be secured against any
unintended operation. The matter should then be referred to qualified
technicians.
Safety protection is likely to be impaired if, for example, the
instrument fails to perform the intended measurements or shows visible
damage
.
1.6GENERAL CLAUSE S
1.6.1 WARNING: The opening of covers or removal of parts, except those to
which access can be gained by hand, is likely to expose live
parts and accessible terminals which can be dangerous to live.
1.6.2 The instrument shall be disconnected from all voltage sources before it
is opened.
1.6.3 Bear in mind that capacitors inside the instrument can hold their
charge even if the instrument has been separated from all voltage
sources
.
1.6.4 WARNING: Any interruption of the protective earth conductor inside or
outside the instrument, or disconnection of the protective
earth terminal, is likely to make the instrument dangerous.
Intentional interruption is prohibited.
1.6.5 Components which are important for the safety of the instrument may
only be renewed by components obtained through your local Philips
organisation. (See also section 15).
1.6.6 After repair and maintenance in the primary circuit, safety inspection
and tests, as mentioned in section 15 have to be performed.

2-1
2. CHARACTERISTICS
A. Performance Characteristics
-Properties expressed in numerical values with stated tolerance are
guaranteed by PHILIPS Specified non-tolerance numerical values
indicate those that could be nominally expected from the mean of
arange of identical instruments.
-This specification is valid after the instrument has warmed up
for 30 minutes (reference temperature 23°C)
.
-For definitions of terms, reference is made to lEC Publication
351-1.
B. Safety Characteristics
-This apparatus has been designed and tested in accordance with
Safety Class Irequirements of lEC Publication 348, Safety
requirements for Electronic Measuring Apparatus, UL 1244 and CSA
556B and has been supplied in asafe condition.
C. Initial Characteristics
.Overall dimensions:
-Width
Including handle :387 mm
Exc luding handle :350 mm
Length
Including handle
,
excl. knobs :518,5 mm
Excluding handle, excl. knobs :443,5 mm
Including handle
,
incl. knobs :530,5 mm
Excluding handle. incl. knobs :455,5 mm
Height
Including feet :146,5 mm
Excluding feet :134,5 mm
Excl. under cabinet :132,5 mm

2-2
Figure 2,1 Dimensions
*Mass :7,5 kg
*Operating positions:
a. Horizontally on bottom feet
b. Vertically on rear feet
c. On the carrying handle in two sloping positions,
D. CONTENTS
2.1. Display
2.2. Vertical deflection or Yaxis
2.3. Horizontal deflection or Xaxis
2.4. Triggering
2.5. Power Supply
2.6. Auxiliary inputs or outputs
2.7. Environmental characteristics
2.8. Safety

2-3
CHARACTERISTICS SPECIFICATION ADDITIONAL INFORMATION
2.1 DISPLAY
*CRT
Type No
Measuring area
(h Xw)
PHILIPS D14-372
80 X100 mm 8x10 div.
1div. =10 mm
1subdiv. (sd) =2mm
*Screen type
Standard
Option
*Total accelera-
tion voltage
*Graticule
Engravings
Division lines
Subdivisions
Dotted lines
Percentages
*Orthogonality
*Illumination
GH (P 31)
GM (P 7)
16 kV
Internal fixed
1cm
2mm
1,5and 6,5 cm
from top
0%, 10%, 90%, 100%
Long persistence
90° +/- 1°
Continuously
var iab le
Horizontal as well as vertical
Idem.
Only horizontal.
Measured in zero point.
*Display time <2us
per channel in
chopped mode
*LCD liquid crys-
tal display
Type No LC 9438130
Visible area 25,4 x88,8 mm
Back lighting Permanently on
All relevant settings are
visible in display.
2.2 VERTICAL DEFLECTION OR YAXIS
2.2.1 Channels Aand B
*Deflection
coef f
.
2mV/div...l0 V/div In 1,2,5sequence.
If PM 8936/09 is used, deflec-
tion coeff. is automatically
calculated in display.
*Variable gain 1:>2,5
control range
*Error limit <+/- 3% Only in calibrated position.
*Input impedance
Paralleled by 1Mohm +/-2%
20 pF +/-2pF Measured at f^ <1MHz
Measured at f^ <1MHz

2-4
CHARACTERISTICS SPECIFICATION ADDITIONAL INFORMATION
*Max, input 400 V(d.c. +a.c.
voltage peak)
Max. test volta- 500 VMax. duration 60 sec.
ges (ntis)
*Bandwidth for >60 MHz Input 6div. sine—wave,
20 mV... 10 V(amb.: 0...35'^C)
Bandwidth for >35 MHz Input 6div. sine-wave.
2mV, 5mV and
10 mV
*Rise-time 5,8 ns or less
*Noise
20 mV. ..10 V<0,5 sd
*Lower -3dB <10 Hz
point
*Dynamic range
@1MHz >+/- 12 div,
(3 50 MHz >8div.
*Position range >+/- 8div.
*Decoupling fac-
tor between
channels
@10 MHz 1:>100
@50 MHz 1:>50
*Common Mode 1:>100
Rejection Ratio
01MHz
*L.F.Non Linearity <3%
*Visible signal >15 ns
delay
Calculated from 0,35/f-3 dB
Measured visually. Pick up on
open BNC excluded.
In AC position, 6div, sine-
wave
Vernier in cal. position.
Vernier in cal. position.
Vernier in cal. position.
Both channels same attenuator
setting.
Input max. 8div, sine-wave,
2,5 and 10 Vare excluded.
2,5 and 10 Vare excluded.
Both channels same attenuator
setting, vernier adjusted for
best CMRR; measured with max,
8div. (+/- 4div.) each chan-
nel.
Max. intensity, measured from
line start to trigger point

2-5
CHARACTERISTICS SPECIFICATION ADDITIONAL INFORMATION
*Base-line jump
between attenua-
tor steps
20 mV, ..10 V
Additional jump
between 10 mV
<>20 mV
Normal Invert
jump
ADD jump
<1sd
<1,5 sd
<1sd
<0,6 div.
Variable jump <1sd
Only channel B.
When Aand Bare positioned in
screen centre (20 mV... 10 V).
Max. jump in any position of
the vernier.
2.2.2 Triggerview
*Bandwidth via
Aor Bchannel >35 MHz 6div. sine-wave
2mV, 5mV, 10 mV
20 mV. ..10 V>50 MHz
(Amb. :0. ..35°C)
Via EXT. input >50 MHz 6div. sine-wave (+/- 3div.
from screen centre).
*Deflection coeff.
Via channel Aor
B
Via EXT. input
Error limit
2mV/div...l0 V/div 1, 2, 5sequence (see Channel
A, B).
100 mV/div,
<5% INTERNAL, EXTERNAL.
*Lower -3dB
point
AC coupling EXT. <10 Hz
input
*Line jump trig- <2sd
ger source
*OFFSET trig. point <1,5 sd
from screen cen-
tre
Only when trigger coupling
is DC.
Jump between trigger source A,
Bcomposite and EXT.
*Delay EXT. trig- <10 ns
ger view and chan-
nel Aor B
*Dynamic range
EXT. input
@1MHz
@50 MHz
>+/- 12 div.
>6div.

2-6
CHARACTERISTICS SPECIFICATION ADDITIONAL INFORMATION
2.3 HORIZONTAL DEFLECTION OR XAXIS
*Horizontal dis- MTB, MTBI,
play modes ALT.TB, DTB
X-DEFL
2.3.1 Main Time Base (MTB)
1, 2, 5sequence (magn.off)
Measured at -4. ..+4 div. from
screen centre.
shifted over screen
centre
*Time coeff.
Error limit
0,5sec , , ,50 ns
<3%
*Horizontal posi*
tion range Start of sweep and
10th div. must be
*Variable control 1:>2,5
ratio
*Time Base mag- Expansion *10
nifier
Error limit <4%
*Horizontal mag- <2,5 sd
nifier balance
*10 >*1
*Hold-Off
Minimum to maxi-
mum hold-off time 1:>10
ratio
2.3.2 Delay Time Base (DTB)
*Time coeff, Ims ., , 50 ns
Error limit
*Horizontal posi-
tion range
*Time Base Mag-
nifier
Not valid in X-deflection.
Measured at +4...-4 div. from
screen centre.
Excluding first 50 ns and
last 50 ns.
Shift start of sweep in *10
in mid-screen position, then
switch to *1
.
Minimum hold off time is rela-
ted to time base setting.
Sequence 1, 2, 5.
See MTB
See MTB
See MTB

2-7
CHARACTERISTICS SPECIFICATION ADDITIONAL INFORMATION
2.3.3
2.3.4
*Delay time Mul-
tiplier
Error limit 3% +1% incremen-
tal delay error
+25 ns +/- 5ns
Incremental de-
lay time error <1%
*Resolution 1:10 000
*Delay Time Jit- 1:>20 000
ter
*Trace separation
Shift range >+/-4div .
X-deflection
*Deflection coeff.
Via channel Aor 2mV/div..,l0 V/div
B
Via EXT. input 100 mV/div.
*Error limit
Via channel Aor <+/- 5%
B
Via EXT. input <+/- 5%
*Bandwidth DC .... >2MHz
*Phase shift be- <3° 0100 kHz
tween Xand Y-
deflection
*Dynamic range >+/- 12 div.
0100 kHz
EXT input
*Input impedance 1Mohm +/- 2%
Paralleled by 20 pF +/- 2pF
*Max. input vol- 400 V(d.c. +a.c.
tage peak)
Max. test vol- 500 V
tage (rms)
*Lower -3dB <10 Hz
*1only
*1only
Only valid in alternate time
base
.
DTB shifts only.
DC coupled
Iq <1MHz
<1MHz
Max. duration 60 sec.
AC coupled
point

2-8
CHARACTERISTICS SPECIFICATION ADDITIONAL INFORMATION
2.4 TRIGGERING
2.4.1 MTB triggering
Trig. mode
AUTO (auto free Bright line in Auto free run starts 100 ms
run) absence of trigger
signal (typ.) after no trig. pulse.
Triggered Switches automatically to auto
free run if one of the display
channels is grounded.
Single In multi-channel mode (alter-
nated) each channel is armed
after reset; if sweep has
already started, sweep is not
finished. Not applicable in
peak to peak coupling.
Trigger source Line trigger source always
A, B, Composite triggers on main frequency.
(AB), EXT, Line Line trigger amplitude depends
on line input voltage.
Approx. 6div. 0220 VAC input
voltage
.
Trigger coupling
Peak-to-peak (p-
DC, TVL, TVF P) ,
Level range
Peak-to-peak Related to peak-
to-peak p-p coupling is DC rejected.
DC INTERNAL >(+ or -8div.)
DC EXTERNAL >(+ or -800 mV)
TVL /TVF Fixed level
Trigger slope
Trigger sensi-
vity
INTERNAL
+/- Slope sign in LCD and +or -if
TVL/F in chosen for positive
or negative video.
0-10 MHz <0,5 div. Trig, coupling DC.
@50 MHz <1,0 div. Trig, coupling DC.
0100 MHz
EXTERNAL
3,0 div. Trig, coupling DC.
0-10 MHz <50 mV Trig, coupling DC.
050 MHz <150 mV Trig, coupling DC.
0100 MHz 500 mV Trig, coupling DC.
TVL/F INTERNAL <0,7 div. Sync, pulse.
EXTERNAL <70 mV Sync, pulse.

2-9
CHARACTERISTICS SPECIFICATION ADDITIONAL INFORMATION
2.4.2 DTB Triggering
*DTB trigger
—
source
Starts, A, B,
Composite (AB),
EXT and TVL
TVL has same trig. source as
MTB trig, source
TVL only valid if MTB trig,
coupling TVL or TVF is chosen.
*Coupling DC
-- *Trigger sensi-
tivity See MTB
*Trigger Level >(+or -8div.
)
range
*Trigger slope +/- Slope sign in LCD, if TVL is
chosen. Slope sign is not valid
2.5 POWER SUPPLY
*Line input vol-
tage AC
Nominal 100 -240 VOne range.
Limits of ope-
ration 90 -264 V
—*Line frequency
Nominal 50 -400 Hz
Limits of ope-
ration 45 0
1Hz
*Safety require-
ments within
specification of:
lEC 348 CLASS I
UL 1244
VDE 0411
CSA 556 B
*Power consumption 45 W