Tektronix 455 User manual

Tektronix*
455/A2/B2
PORTABLE
OSCILLOSCOPE
WITH OPTIONS
I N S T R U C T I O N M A N U A L

Tektronix, Inc.
P.O. Box 500
Be verton, Oregon
070-1907-01
Product Group 40
Tektronix
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
455/A2/B2
PORTABLE
OSCILLOSCOPE
WITH OPTIONS
I N S T R U C T I O N M A N U A L
97077 Seri l Number
__________________
First Printing MAR 1975
Revised OCT 1983

Copyright © 1975 Tektronix, Inc. All rights reserved.
Contents of this public tion m y not be reproduced in ny
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. nd its subsidi ries re covered
by U.S. nd foreign p tents nd/or pending p tents.
TEKTRONIX, TEK, SCOPE-MOBILE, nd re
registered tr dem rks of Tektronix, Inc. TELEQUIPMENT
is registered tr dem rk of Tektronix U.K. Limited.
Printed in U.S.A. Specific tion nd price ch nge privileges
re reserved.
INSTRUMENT SERIAL NUMBERS
E ch instrument h s seri l number on p rtel insert, t g,
or st mped on the ch ssis. The first number or letter
design tes the country of m nuf cture. The l st five digits
of the seri l number re ssigned sequenti lly nd re
unique to e ch instrument. Those m nuf ctured in the
United St tes h ve six unique digits. The country of
m nuf cture is identified s follows:
B000000 Tektronix, Inc., Be verton, Oregon, USA
100000 Tektronix Guernsey, Ltd., Ch nnel Isl nds
200000 Tektronix United Kingdom, Ltd., London
300000 Sony/Tektronix, J p n
700000 Tektronix Holl nd, NV, Heerenveen,
The Netherl nds

TABLE OF CONTENTS
P ge
List of Illustrations iv
List of Tables v
Safety Su ary vii
OPERATOR S INSTRUCTIONS
SECTION 1 — SPECIFICATIONS
455 Main Module 1-1
A2 Vertical Module 1-5
B2 Horizontal Module 1-7
Reco ended Accessories 1-11
SECTION 2 — OPERATING INSTRUCTIONS
Operating Voltage 2-1
Safety Infor ation 2-1
Functions of Controls, Connectors, and Indicators 2-1
455 Main Module 2-1
A2 Vertical Module 2-3
B2 Horizontal Module 2-5
Basic Applications and Measure ents 2-8
Peak-to-Peak A plitude Measure ents 2-8
Instantaneous A plitude Measure ent 2-8
Dual Trace Phase Difference Measure ent 2-8
High Resolution Phase Measure ent 2-9
Co on Mode Rejection 2-10
Cascaded Operation 2-10
Ti e Duration Frequency Measure ents 2-10
Riseti e Measure ents 2-11
Differential Ti e Measure ents 2-11
Delayed Sweep Magnification 2-13
SECTION 3 — PERFORMANCE CHECK
Options 3-1
Test Equip ent Required 3-1
Preli inary Procedure 3-2
Perfor ance Check Procedure 3-2
SERVICING INSTRUCTIONS
FOR QUALIFIED SERVICE PERSONNEL ONLY
SECTION 4 — CIRCUIT DESCRIPTION
Basic Circuit Functions 4-1
455 Main Module 4-1
A2 Vertical Module 4-1
B2 Horizontal Module 4-2
Detailed Circuit Operation 4-3
Calibrator 4-3
Multivibrator 4-3
Output A plifier 4-3
Horizontal Output A plifier 4-3
Sweep Gate A plifier 4-3

455/A2/B2
TABLE OF CONTENTS (cont)
SECTION 4 — CIRCUIT DESCRIPTION (cont) P ge
Crt Circuit 4-4
High-Voltage Oscillator 4-4
High-Voltage Regulator 4-4
High-Voltage Circuitry 4-5
Crt Control Circuits 4-5
Z Axis A plifier 4-5
Low-Voltage Power Supply 4-5
Power Input 4-5
Secondary Circuit 4-6
Channel 1 and Channel 2 Input Circuits 4-7
Scale Factor Control 4-7
Input Coupling and Volts/Division Switching 4-7
FET Input Source Follower 4-7
Vertical Prea plifier and Switching 4-7
Prea plifier and Channel Switching Gates 4-7
Channel Switching Multivibrator 4-10
Vertical Output A plifier 4-11
Delay-Line Driver 4-11
Nor al Trigger Pickoff 4-11
Vertical Output A plifier 4-11
Trigger Input 4-12
Trigger Coupling 4-12
Input Source Follower 4-12
Trigger, Sweep, and Horizontal Prea plifier 4-12
A and B Trigger Generators 4-12
Sweep Generator IC's 4-15
Miller Sweep Generator 4-15
Sweep Control 1C 4-16
Sweep Control Operation 4-17
A Sweep Mode 4-17
B Dly'd Sweep Mode 4-18
A Inten Sweep Mode 4-18
Horizontal Prea plifier 1C 4-19
SECTION 5 — MAINTENANCE
Cabinet Re oval 5-1
Preventive Maintenance 5-1
Cleaning 5-1
Interior 5-1
Switch Contacts 5-2
Exterior 5-2
Crt 5-2
Visual Inspection 5-2
Lubrication 5-2
Se iconductor Checks 5-2
Recalibration 5-2
Corrective Maintenance 5-3
Obtaining Replace ent Parts 5-3
Standard Parts 5-3
Special Parts 5-3
Ordering Parts 5-3

455/A2/B2
TABLE OF CONTENTS (cont)
SECTION 5 — MAINTENANCE (cont) P ge
Soldering Techniques 5-3
Co ponent Re oval and Replace ent 5-4
Rear Panel Asse bly Re oval 5-4
Cabinet Botto Re oval 5-4
Interconnecting Cable and Pin Connector
Replace ent 5-4
Shaft-Knob Re oval 5-6
Cathode Ray Tube (Crt) Re oval 5-6
Vertical Module Re oval 5-7
Scale-Factor LED Replace ent 5-7
VOLTS/DIV Switch Asse bly Re oval 5-9
Substrate or Contact Replace ent
Considerations 5-9
Actuator Asse bly Replace ent
Considerations 5-9
Hybrid 1C Re oval 5-10
Horizontal Module Re oval 5-11
Board Locations 5-11
A and B Ti ing Switch Board Re oval 5-12
Trigger Board Re oval 5-13
Horizontal Board Re oval 5-13
Troubleshooting 5-14
Troubleshooting Aids 5-14
Troubleshooting Chart 5-14
Diagra s 5-14
Circuit Board Illustrations 5-14
Co ponent Value Identification 5-14
Se iconductor Lead Configurations 5-14
Troubleshooting Equip ent 5-14
Troubleshooting Techniques 5-16
Check Control Settings 5-16
Check Associated Equip ent 5-16
Check Instru ent Calibration 5-16
Visual Check 5-16
Isolate Trouble to a Circuit 5-16
Check Circuit Board Interconnections 5-16
Check Voltages and Wavefor s 5-16
Check Individual Co ponents 5-16
Repair and Readjust the Circuit 5-17
Repackaging For Ship ent 5-20
SECTION 6 — ADJUSTMENTS
Tolerances 6-1
Adjust ent Interaction 6-1
Partial Procedures 6-1
Test Equip ent Required 6-1
A. Main Module 6-3
Preli inary Procedure 6-3
Procedure 6-3
B. Vertical Module 6-6
C. Horizontal Module 6-10
in
REV. C, NOV. 1977

TABLE OF CONTENTS (cont)
SECTION 7 — INSTRUMENT OPTIONS
SECTION 8 — REPLACEABLE ELECTRICAL PARTS
SECTION 9 — DIAGRAMS AND CIRCUIT BOARD
ILLUSTRATIONS
SECTION 10 — REPLACEABLE MECHANICAL PARTS
Accessories
CHANGE INFORMATION
LIST OF ILLUSTRATIONS P ge
Fig. 1-1. Di ensional drawing. 1-4
Fig. 1-2. Trigger coupling and sensitivity. 1-7
Fig. 1-3. Differential Ti e Measure ent accuracy. 1-10
Fig. 2-1. 455 Main Module (front). 2-1
Fig. 2-2. 455 Main Module (rear). 2-2
Fig. 2-3. A2 Vertical Module. 2-3
Fig. 2-4. B2 Horizontal Module. 2-5
Fig. 2-5. Peak-to-peak voltage easure ent. 2-8
Fig. 2-6. Instantaneous voltage easure ent. 2-8
Fig. 2-7. Phase difference. 2-9
Fig. 2-8. High-resolution phase difference. 2-9
Fig. 2-9. Co on- ode rejection. 2-10
Fig. 2-10. Ti e duration. 2-11
Fig. 2-11. Riseti e. 2-11
Fig. 2-12. Ti e duration between points on a wavefor . 2-12
Fig. 2-13. Ti e difference between pulses. 2-12
Fig. 2-14. Delayed Sweep agnification. 2-13
Fig. 3-1. A plitude calibrator test setup. 3-3
Fig. 3-2. Fast-rise pulse generator test setup. 3-4
Fig. 3-3. Sine-wave generator test setup #1. 3-5
Fig. 3-4. Low-frequency generator test setup. 3-6
Fig. 3-5. Sine-wave generator test setup #2. 3-7
Fig. 3-6. Ti e- ark generator test setup. 3-10
Fig. 4-1. High-voltage oscillator wavefor relationships. 4-4
Fig. 4-2. Foldback circuit action. 4-6
Fig. 4-3. Attenuator and gain switching sequences. 4-8
Fig. 4-4. Channel Switching gates. 4-9
Fig. 4-5. Trigger 1C functional block diagra . 4-13
Fig. 4-6. Sweep generator 1C functional block diagra . 4-14
Fig. 4-7. Sweep control 1C functional block diagra . 4-17
Fig. 4-8. Sweep operation in A ode. 4-18
Fig. 4-9. Sweep-circuit wavefor relationships. 4-19
Fig. 4-10. Sweep operation in B DLY'D ode. 4-20

455/A2/B2
TABLE OF CONTENTS (cont)
LIST OF ILLUSTRATIONS (cont) P ge
Fig. 5-1. Rear-panel asse bly re oval. 5-4
Fig. 5-2. Cabinet botto re oval. 5-5
Fig. 5-3. Pin connector replace ent. 5-5
Fig. 5-4. Shaft-knob re oval. 5-6
Fig. 5-5. Vertical Module re oval. 5-7
Fig. 5-6. LED replace ent. 5-7
Fig. 5-7. VOLTS/DIV switch disasse bly. 5-8
Fig. 5-8. Hybrid 1C replace ent. 5-10
Fig. 5-9. Horizontal Module re oval. 5-11
Fig. 5-10. Circuit board locations. 5-11
Fig. 5-11. A and B ti ing switch diassse bly. 5-12
Fig. 5-12. Co ponent value identification. 5-15
Fig. 5-13. Troubleshooting chart. 5-18
Fig. 6-1. +32 volt adjust ent location. 6-4
Fig. 6-2. Z axis co pensation adjust ent location. 6-4
Fig. 6-3. Crt and calibrator adjust ent locations. 6-5
Fig. 6-4. Vertical adjust ent locations. 6-9
Fig. 6-5. Sweep adjust ent locations. 6-10
Fig. 6-6A Horizontal and Trigger adjust ent locations
SN B044420-UP. 6-11
Fig. 6-6B. Horizontal and Trigger adjust ent locations
below SN B044420. 6-11
Fig. 6-7. C232 and C233 adjust ent locations. 6-13
Fig. Option 4-1. Partial Power Supply diagra . Option 4 Page 1
Fig. Option 5-1. Block diagra . Option 5 Page 8
Fig. Option 5-2. Inverting/non-inverting a plifier block diagra . Option 5 Page 9
Fig. Option 7-1. Power switch. Option 7 Page 1
Fig. Option 7-2. Dc voltage selector switch and dc input connector. Option 7 Page 2
Fig. Option 7-3. Si plified block diagra . Option 7 Page 3
Fig. Option 7-4. Adjust ent Locations. Option 7 Page 6
LIST OF TABLES
1-1. Electrical (455 Main Module). 1-1
1-2. Environ ental. 1-3
1-3. Physical. 1-3
1-4. Electrical (A2 Vertical Module). 1-5
1-5. Electrical (B2 Horizontal Module). 1-7
3-1. Test Equip ent Required. 3-1
3-2. Vertical Deflection Accuracy. 3-3
3-3. A and B Ti ing Accuracy. 3-10
3-4. A and B Magnified Accuracy. 3-11
3-5. Differential Ti e Accuracy. 3-12
5- 1. Power Supply Tolerance and Ripple. 5-16
6- 1. Test Equip ent Required for Adjust ent Procedure. 6-1
6-2. Low-Frequency Input Co pensation. 6-7
1. Sync Separator Trigger Sensitivity. Option 5 Page 1
1. Option 7 Power Sources. Option 7 Page 2
REV C AUG 1980
V

OPERATORS SAFETY SUMMARY
455/A2/B2
The gener l s fety inform tion in this p rt of the summ ry is for both oper ting nd servicing
personnel. Specific w rnings nd c utions will be found throughout the m nu l where they
pply, but m y not ppe r in this summ ry.
TERMS
In This M nu l
CAUTION st tements identify conditions or pr ctices th t could result in d m ge to the
equipment or other property.
WARNING st tements identify conditions or pr ctices th t could result in person l injury or
loss of life.
As M rked on Equipment
CAUTION indic tes person l injury h z rd not immedi tely ccessible s one re ds the
m rking, or h z rd to property including the equipment itself.
DANGER indic tes person l injury h z rd immedi tely ccessible s one re ds the m rking.
SYMBOLS
In This M nu l
This symbol indic tes where pplic ble c ution ry or other inform tion is to be
found.
As M rked on Equipment
yDANGER — High volt ge.
Protective ground (e rth) termin l.
ATTENTION — refer to m nu l.
Power Source
This product is intended to oper te from power source th t will not pply more th n 250 volts
rms between the supply conductors or between either supply conductor nd ground. A
protective ground connection by w y of the grounding conductor in the power cord is
essenti l for s fe oper tion.

455/A2/B2
Grounding the Product
This product is grounded through the grounding conductor of the power cord. To void
electric l shock, plug the power cord into properly wired recept cle before connecting to the
product input or output termin ls. A protective ground connection by w y of the grounding
conductor in the power cord is essenti l for s fe oper tion.
D nger Arising From Loss of Ground
Upon loss of the protective-ground connection, ll ccessible conductive p rts (including
knobs nd controls th t m y ppe r to be insul ting) c n render n electric shock.
Use the Proper Power Cord
Use only the power cord nd connector specified for your product.
Use only power cord th t is in good condition.
For det iled inform tion on power cords nd connectors, see Section 2, Oper ting
Instructions.
Refer cord nd connector ch nges to qu lified service personnel.
Use the Proper Fuse
To void fire h z rd, use only the fuse of correct type, volt ge r ting nd current r ting s
specified in the p rts list for your product.
Refer fuse repl cement to qu lified service personnel.
Do Not Oper te in Explosive Atmospheres
To void explosion, do not oper te this product in n explosive tmosphere unless it h s been
specific lly certified for such oper tion.
Do Not Remove Covers or P nels
To void person l injury, do not remove the product covers or p nels. Do not oper te the
product without the covers nd p nels properly inst lled.

455/A2/B2
SERVICING SAFETY SUMMARY
FO R Q U A L IF IE D S E R V IC E P E R S O N N E L O N L Y
Refer also to t e preceding Operators Safety Summary.
Do Not Service Alone
Do not perform intern l service or djustment of this product unless nother person c p ble of
rendering first id nd resuscit tion is present.
Use C re When Servicing With Power On
D ngerous volt ges exist t sever l points in this product. To void person l injury, do not
touch exposed connections nd components while power is on.
Disconnect power before removing protective p nels, soldering, or repl cing components.
Power Source
This product is intended to oper te from power source th t will not pply more th n 250 volts
rms between the supply conductors or between either supply conductor nd ground. A
protective ground connection by w y of the grounding conductor in the power cord is
essenti l for s fe oper tion.

455/A2/B2
x
455/A2/B2 Port ble Oscilloscope.

Section 1—455/A2/B2
SPECIFICATIONS
The 455/A2/B2 is a 50 MHz, dual-channel, portable oscilloscope designed to operate in a wide range of environ ental
conditions.
The dual-channel dc to 50 MHz A2 vertical deflection syste provides calibrated deflection factors fro 5 illivolts to
5 volts/division.
The B2 horizontal deflection syste provides stable triggering over the full bandwidth capabilities of the vertical syste .
Calibrated sweep rates are provided fro 0.5 seconds to 0.05 icroseconds/division along with delayed sweep features for
accurate relative-ti e easure ents. A X10 agnifier extends the calibrated sweep rate to 5 nanoseconds/division.
Standard 455 oscilloscopes can be operated fro no inal 116 volt or 232 volt, 48 to 440 Hz power lines. With Option 7, the
455 can be operated fro 12 or 24 volt dc power sources (or the snap-on Tektronix 1106 Battery Pack). Option 7 Specifica
tions are located in the Options section of this anual.
The Electrical Characteristics are divided into two categories: Characteristics shown in the Perfor ance Require ent colu n
are instru ent specifications and can be verified by the Perfor ance Check. Infor ation in the Supple ental Infor ation
colu n is provided for reference or clarification only.
The following instru ent specifications apply over an a bient te perature range of — 15°C to +55°C unless otherwise indica
ted. The adjust ent procedure in Section 6, when perfor ed co pletely, allows the 455/A2/B2 to eet the electrical speci
fications listed below.
TABLE 1-1
Electrical (455 Main Module)
Characteristic Perfor ance Require ent Supple ental Infor ation
CALIBRATOR
Output Voltage
0°C to +40° C 0.3 V within 1.0%. Within 0.3% at +25°C, within 3°C.
—15°C to +55°C 0.3 V within 1.5%.
Repetition Rate Approxi ately 1 kHz. Within 25%.
Output Resistance Approxi ately 60 fi.
Z AXIS INPUT
Sensitivity Noticeable odulation at nor al
intensity with 0.5 V or ore p-p signal.
Usable frequency Range Dc to 20 MHz.
Input Resistance at DC 1.6 kfi.
Maxi u Input Voltage 25 V (dc plus peak ac). 25 V p-p ac at
1 kHz or less.
SIGNAL OUTPUTS
CH 2 OUT See Vertical Module Specifications.
REV. A, OCT 1975 1-1

Specific tions—455/A2/B2
TABLE 1-1 (continued)
Electrical (455 Main Module)
Characteristics Perfor ance Require ent Supple ental Infor ation
SIGNAL OUTPUTS (continued)
A Gate
Output Voltage Approxi ately 5.0 V positive-going pulse.
Output Resistance Approxi ately 500 f2.
POWER SOURCE
Line Voltage Ranges
116 V 100 V to 132 V r s.
232 V 200 V to 264 V r s.
Line Frequency 48 Hz to 440 Hz.
Maxi u Power Consu ption
(455/A2/B2) 40 watts at 115 V, 60 Hz. NOTE
With A 2 and B2 Modules typical
power consumption is about 32
watts.
CRT DISPLAY
Horizontal Resolution At least 15 lines in 1 div.
Vertical Resolution At least 15 lines in 1 div.
Display Area 8 x1 0 c .
Geo etry 0.1 div or less.
Trace Rotation Range Adequate to align trace with horizontal
center line.
Standard Phosphor P31.
Optional Phosphor P11.
Raster Distortion 0.1 div or less.
No inal Accelerating
Potential «12,000 V.
1-2 REV. A, OCT 1975

Specific tions—455/A2/B2
TABLE 1-2
Environment l
Ch r cteristic Perform nce Requirement
Te perature
Storage —55°C to +75° C.
Operating —15°C to +55°C.
Altitude
Storage To 50,000 ft.
Operating To 15,000 ft. Maxi u operating
te perature decreased 1°C/1,000 ft.
above 5,000 ft.
Hu idity (Operating and Storage) 5 cycles (120 hrs.) referenced to MIL-
E-16400F.
Vibration (Operating) 15 in. along each of 3 ajor axes at
a total displace ent of 0.025 inch p-p
(4 g's at 55 Hz) with frequency varied
fro 10 Hz to 55 Hz to 10 Hz in 1 in.
sweeps. Hold 3 in. at each ajor
resonance or if none present, hold 3
in. at 55 Hz.
Shock (Operating and Non-Operating) 30 g's, 'A sine, 11 s duration, 2 shocks
per axis each direction for a total of
12 shocks.
TABLE 1-3
Physic l
Ch r cteristic Inform tion
Weight
455/A2/B2 with Panel Cover,
Modules, Accessories and
Accessory Pouch
27.0 lbs (12.2 kg).
Without Panel Cover, Accessories,
and Accessory Pouch 24.0 lbs (10.9 kg).
Do estic Shipping Weight 34.2 lbs (15.5 kg).
Height
With Feet and Pouch 9.00 in. (22.86 c ).
Without Pouch 7.00 in (17.78 c ).
REV. A, OCT 1975 1-3

Specific tions—455/A2/B2
TABLE 1-3 (continued)
Physical
Characteristic Infor ation
Width
With Handle 13.65 in. (34.67 c ).
Without Handle 12.50 in. (31.75 c ).
Depth
Including Panel Cover 19.50 in. (49.53 c ).
Handle Extended 21.70 in. (55.19 c ).
Transportation Meets the li its of National Safe Transit
Co ittee Test Procedure 1A with a 30-inch
drop.
Construction Plastic alloy cabinet, allu inu alloy
chassis and panel, with glass la inate
etched wiring circuit boards.
Finish Anodized front panel and textured
cabinet.
1907-20
Fig. 1-1. Dimension l dr wing.
1-4 REV. A, OCT 1975

Specific tions—455/A2/B2
TABLE 1-4
Electrical (A2 Vertical Module)
Characteristic Perfor ance Require ent Supple ental Infor ation
Deflection Factor
Calibrated Range 5 V to 5 V/DIV in 10 steps: 1-2-5
sequence.
Uncalibrated (VAR) Range Provides continuously variable deflec
tion factors between calibrated settings.
Extends deflection factor to at least
12.5 V/DIV.
At least 2.5:1.
Accuracy Within 3% With GAIN set at 5 V/DIV.
Low-Frequency Linearity 0.1 div or less co pression of a 2 division
signal at center screen when positioned to
the upper and lower extre es of the
graticule area.
Frequency Response
Bandwidth (CH 1 & CH 2)
5 V to 2 V/DIV DC to at least 50 MHz.
5-div reference signal centered vertically
fro 25 £2 source with VAR V/DIV in
calibrated position.
5 V/DIV DC to at least 45 MHz.
AC Coupled Lower —3 dB
Point 10 Hz or less with a IX probe. 1 Hz
or less with a 10X probe.
Step Response
Riseti e (0.35 + bw in MHz)
— 15°C to +55°C
5 V to 2 V/DIV 7.0 nanoseconds or less
5-div reference centered vertically dc
coupled at all deflection factors fro a
25 £2 source with VAR V/DIV control in
calibrated position.
5 V/DIV 7.8 nanoseconds or less
Positive—Going Step
(excluding ADD Mode)
Aberrations
0°C to +40° C
5 V to 1 V/DIV Less than +3%, —3%, 3% p-p.
2 V/DIV Less than +5%, —5%, 5% p-p.
5 V/DIV Less than +10%, —10%, 10% p-p.
—15°C to +55°C
5 V to 1 V/DIV Less than +6%, —6%, 6% p-p.
2 V/DIV Less than +8%, —8%, 8% p-p.
5 V/DIV Less than +13%, -13%, 13% p-p.
Position Effect 0°C to +40°C Total aberration less than +5%, —5%,
5% p-p.
Negative Going Step Add 2% to all positive going step
specifications.
ADD Mode Operation Add 5% to all aberrations specifications.
CH 2 Inverted Equal to or less than 3% in addition to
the non-inverted aberrations.
REV. B, MAY, 1978 1-5

Specific tions—455/A2/B2
TABLE 1-4 (continued)
Electric l (A2 Vertic l Module)
Characteristic Perfor ance Require ent Supple ental Infor ation
Co on-Mode Rejection Ratio
(ADD Mode with CH 2 Inverted) At least 10:1 at 10 MHz for co on
ode signals of 6 div or less with
GAIN adjusted for best CMRR at
50 kHz.
Step Atten Balance
+20° C to +30° C 0.2 div or less.
Trace Shift as VAR is rotated 2.0 div or less.
INVERT Trace Shift Less than 2 div when switching fro
nor al to inverted.
Input Gate Current
—15°C to +30°C 0.5 nA or less (0.1 div at 5 V/div).
+30°C to +55°C 4.0 nA or less (0.8 div at 5 V/div).
Channel Isolation At least 100:1 at 20 MHz.
Position Range At least +12 and —12 div fro
graticule center.
Chopped Mode Repetition Rate Approxi ately 250 kHz. 250 kHz within 20%.
Input Resistance and Capacitance 1 M£2 within 2% paralleled by approxi
ately 20 pF within 3%. Aberrations 2% or less using a 1 M£2,
20 pF input ti e constant nor alizer
(+20° C to +30° C).
Maxi u Input Voltage
DC Coupled 250 V (dc + Peak ac) or 500 V p-p ac
at 1 kHz or less.
AC Coupled 250 V (dc + Peak ac) or 500 V p-p ac
at 1 kHz or less.
Cascaded Operation (CH 2 OUT
into CH 1)
Bandwidth DC to at least 20 MHz.
CH 2 OUT into CH 1 input using
50 SI 42" cable ter inated in 50 £2
at CH 1 input.
Cascaded Sensitivity Approxi ately 1 V/div when ter i
nated in 50 SI at CH 1 input with both
CH 1 and CH 2 VOLTS/DIV switches
set at 5 V/div.
Within -30%, +30%.
Channel 2 Signal Output
(Through Main Module CH 2
OUT Connector)
Output Voltage Approxi ately 50 V/div into 1 M£2.
Approxi ately 25 V/div into 50 SI.
Output Resistance Approxi ately 50 SI.
Bandwidth DC to at least 20 MHz into 50 £2.
DC Level Approxi ately 0 V.
1-6 REV. C, MAY, 1978

Specific tions—455/A2/B2
TABLE 1-5
Electric l (B2 Horizont l Module)
Ch r cteristic Perform nce Requirement Supplement l Inform tion
TRIGGERING
Sensitivity (See Fig. 1-2) In EXT -r 10, ultiply require ents
by 10.
AC Coupled 0.4 div internal or 50 V external fro
60 Hz to 10 MHz increasing to 1.5 div
internal or 250 V external at 50 MHz.
LF REJ Coupled 0.4 div internal or 100 V external fro
50 kHz to 10 MHz (increasing to 1.5 div
internal or 250 V external at 50 MHz.
Attenuates signals below about 50 kHz.
HF REJ Coupled 0.4 div internal or 100 V external fro
60 Hz to 50 kHz. Attenuates signals below
about 60 Hz and above about 50 kHz.
DC Coupled 0.4 div internal or 50 V external fro
dc to 10 MHz increasing to 1.5 div in
ternal or 250 V external at 50 MHz.
Trigger Jitter (At 50 MHz and
5 ns/div)
0°C to +40° C 0.5 ns or less.
—15°C to +55°C 1.0 ns or less.
REV. A. O C 1975 1-7
Fig. 1-2. Trigger coupling nd sensitivity.