Tektronix 2236 User manual

Tektronix
COMMITTED TO EXCELLENCE
WARNING
THE FOLLOWING SERVICING INSTRUCTIONS ARE
FOR USE B QUALIFIED PERSONNEL ONL . TO
AVOID PERSONAL INJUR , DO NOT PERFORM AN
SERVICING OTHER THAN THAT CONTAINED IN
OPERATING INSTRUCTIONS UNLESS OU ARE
QUALIFIED TO DO SO. REFER TO THE OPERATORS
SAFET SUMMAR AND THE SERVICE SAFET
SUMMAR PRIOR TO PERFORMING AN SERVICE.
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
2236
OSCILLOSCOPE
SERVICE
INSTRUCTION MANUAL
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077 Serial Number
070-4204-00
Product Group 46 First Printing MAR 1983
Revised NOV 1986

Copyright © 1983 Tektronix, Inc. All rights reserved.
Contents of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered
by U.S. and foreign patents and/or pending patents.
TEKTRONIX, TEK, SCOPE-MOBILE, and are
registered trademarks of Tektronix, Inc. TELEQUIPMENT
is a registered trademark of Tektronix U.K. Limited.
Printed in U.S.A. Specification and price change privileges
are reserved.
INSTRUMENT SERIAL NUMBERS
Each instrument has a serial number on a panel insert, tag,
or stamped on the chassis. The first number or letter
designates the country of manufacture. The last five digits
of the serial number are assigned sequentially and are
unique to each instrument. Those manufactured in the
United States have six unique digits. The country of
manufacture is identified as follows:
B000000 Tektronix, Inc., Beaverton, Oregon, USA
100000 Tektronix Guernsey, Ltd., Channel Islands
200000 Tektronix United Kingdom, Ltd., London
300000 Sony/Tektronix, Japan
700000 Tektronix Holland, NV, Heerenveen,
The Netherlands

2236 Service
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS ...................................... iv
LIST OF TABLES ..................................................... v
OPERATORS SAFET SUMMMAR ...................... vi
SERVICING SAFET SUMMAR ............................ vii
SECTION 1 SPECIFICATION
INTRODUCTION .............................. 1-1
ACCESSORIES ................................ 1-1
PERFORMANCE CONDITIONS .... 1-1
SECTION 2 OPERATING INSTRUCTIONS
PREPARATION FOR USE .............. 2-1
SAFET ...................................... 2-1
LINE VOLTAGE .......................... 2-1
POWER CORD ............................ 2-1
LINE FUSE .................................. 2-1
INSTRUMENT COOLING ............ 2-2
CONTROLS, CONNECTORS, AND
INDICATORS .................................... 2-2
DISPLA , POWER, AND PROBE
ADJUST ...................................... 2-2
VERTICAL .................................. 2-3
HORIZONTAL .............................. 2-4
TRIGGER .................................... 2-6
COUNTER, TIMER, AND
MULTIMETER ............................ 2-8
RIGHT SIDE PANEL .................... 2-9
REAR PANEL .............................. 2-9
OPERATING CONSIDERATIONS .. . 2-11
GRATICULE ................................ 2-11
GROUNDING .............................. 2-11
SIGNAL CONNECTIONS ............ 2-11
INPUT COUPLING CAPACITOR
PRECHARGING .......................... 2-11
POWER-UP CHECKS ................ 2-12
CTM MEASUREMENT
CONSIDERATIONS .................... 2-12
STATUS AND ERRORS
MESSAGES ................................ 2-12
OPERATOR’S ADJUSTMENTS .... 2-14
INTRODUCTION ........................ 2-14
BASELINE TRACE ...................... 2-14
TRACE ROTATION ...................... 2-14
PROBE COMPENSATION .......... 2-15
Page
SECTION 3 THEOR OF OPERATION
INTRODUCTION .............................. 3-1
SECTION ORGANIZATION ........ 3-1
INTEGRATED CIRCUIT
DESCRIPTIONS .......................... 3-1
GENERAL DESCRIPTION .............. 3-2
OSCILLOSCOPE ........................ 3-2
CTM ............................................ 3-3
DETAILED CIRCUIT DESCRIPTION 3-4
OSCILLOSCOPE ........................ 3-4
VERTICAL ATTENUATORS . . 3-4
Input Coupling .................... 3-4
Buffer Amplifier and Gain
Switching Network ............ 3-5
Paraphase Amplifier .......... 3-5
VERTICAL PREAMPLIFIERS . 3-5
CHANNEL SWITCH AND
VERTICAL OUTPUT .............. 3-6
Delay Line Driver ................ 3-7
Vertical Output Amplifier ... 3-7
A/B Sweep Separation
Circuit ................................ 3-8
TRIGGER AMPLIFIERS AND
SWITCHING ............................ 3-8
Internal Trigger Amplifier ... 3-9
A External Trigger Amplifier 3-9
Line Trigger Amplifier ........ 3-9
A TRIGGER GENERATOR ... 3-9
A Trigger Level Circuit .... 3-9
A Trigger Level Comparator 3-10
A Schmitt Trigger and TV
Trigger Circuit .................... 3-10
A SWEEP GENERATOR AND
LOGIC .................................... 3-10
A Miller Sweep Generator .. 3-11
A Sweep Logic .................. 3-11
ALTERNATE B SWEEP .......... 3-12
B Miller Sweep Generator . 3-12
B Trigger Level Comparator 3-13
Runs After Delay ................ 3-13
B Delay Time Position
Comparator ........................ 3-13
B Sweep Logic .................. 3-13
Alternate Display Switching
Logic .................................. 3-14
B Z-Axis Logic .................. 3-14
i

2236 Service
SECTION 3
TABLE OF CONTENTS (cont)
Page Page
THEOR OF OPERATION (cont) SECTION 3 THEOR OF OPERATION (cont)
HORIZONTAL ........................
3-14 SCOPE SWEEP S STEM
Horizontal Preamplifier .... 3-14 INTERFACE
............................
3-28
X- Amplifier ......................
3-15 Delay/Delta Time Controller-
Horizontal Output Amplifier . 3-15 Digital Section ....................
3-28
Z-AXIS AMPLIFIER ................ 3-16 Delay/Delta Time Controller-
Dc Restorer ........................
3-17 Analog Section
..................
3-29
POWER SUPPL AND PROBE Intensified Zone Controller . 3-29
ADJUST ..................................
3-18 DMM ......................................
3-29
Power Input ........................ 3-18 Input Switching Network ... 3-32
Preregulator ...................... 3-18 Input Filter
..........................
3-33
Inverter .............................. 3-19 Input Buffer
........................
3-33
Crt Supply ..........................
3-19 Rms Converter ..................
3-34
Focus Circuit ......................
3-19 Ac Compensation
.............. 3-34
Low-Voltage Supplies and Multiplexer and Voltage
Fan ....................................
3-19 Reference
..........................
3-34
Probe Adjust ......................
3-20 V/F Converter
.................... 3-34
CTM ............................................. 3-20 Ohms Reference
................
3-35
CPU S STEM ........................ 3-20 Overload Protection
..........
3-36
Microprocessor Reset ........
3-20 Serial Interface
..................
3-36
CPU Clock and Interrupt Relay Drive
........................
3-36
Timing ................................ 3-20 DMM Power Supply
.......... 3-37
Address Decoding Logic ... 3-20
ROM ..................................
3-20
Buffered Data Bus Latch .. 3-21
Counter Data Bus Switch .. 3-21
DISPLA S STEM
Display Multiplexing ..........
3-21 SECTION 4 PERFORMANCE CHECK
Display and Filament Driver 3-21 PROCEDURE
INPUT/OUTPUT PORTS INTRODUCTION
.............................. 4-1
Sample Counter Read Ports 3-21 PURPOSE
.......... ........................ 4-1
Time Counter Read Ports .. 3-22 STRUCTURE
.............................. 4-1
Pushbutton Read Port .... 3-22 TEST EQUIPMENT
....................
4-1
Oscilloscope Read Port and LIMITS AND TOLERANCES . . . . 4-1
Probe Decoder ..................
3-22 PREPARATION FOR CHECKS .. 4-2
Counter Control Latch .... 3-22 INDEX TO PERFORMANCE
DMM Control Latch ..........
3-22 CHECK STEPS
..........................
4-4
Audio Transducer .............. 3-22 VERTICAL
........................................
4-5
COUNTER S STEM .............. 3-22 HORIZONTAL
.................................. 4-9
Input Multiplexer ................ 3-22 TRIGGER
........................................
4-12
Synchronizer ......................
3-23 C TM
.................................................. 4-15
Oscillators .......................... 3-27
Phase-Locked Loop .......... 3-27
Sample and Time Counter
Chains ................................
3-27
ii

2236 Service
TABLE OF CONTENTS (cont)
Page
SECTION 5 ADJUSTMENT PROCEDURE
INTRODUCTION .............................. 5-1
PURPOSE .................................. 5-1
STRUCTURE .............................. 5-1
TEST EQUIPMENT .................... 5-1
LIMITS AND TOLERANCES .... 5-1
ADJUSTMENT INTERACTION . . 5-1
PREPARATION FOR
ADJUSTMENT ............................ 5-1
INDEX TO ADJUSTMENT
PROCEDURE STEPS ................ 5-3
POWER SUPPL AND CRT DISPLA 5-4
VERTICAL ........................................ 5-6
HORIZONTAL .................................. 5-15
TRIGGER ......................................... 5-20
C TM ................................................... 5-24
SECTION 6 MAINTENANCE
STATIC-SENSITIVE COMPONENTS 6-1
PREVENTIVE MAINTENANCE ........ 6-2
INTRODUCTION ........................ 6-2
GENERAL CARE ........................ 6-2
INSPECTION AND CLEANING . . 6-2
LUBRICATION ............................ 6-5
SEMICONDUCTOR CHECKS ... 6-5
PERIODIC READJUSTMENT ... 6-5
TROUBLESHOOTING ...................... 6-5
INTRODUCTION ........................ 6-5
TROUBLESHOOTING AIDS .... 6-5
TROUBLESHOOTING
EQUIPMENT .............................. 6-7
TROUBLESHOOTING
TECHNIQUES ............................ 6-7
CTM TROUBLESHOOTING
PROCEDURE .............................. 6-10
CORRECTIVE MAINTENANCE ___ 6-22
INTRODUCTION ........................ 6-22
MAINTENANCE PRECAUTIONS . 6-22
Page
SECTION 6 MAINTENANCE (cont)
OBTAINING REPLACEMENT
PARTS ........................................ 6-22
MAINTENANCE AIDS ................ 6-22
INTERCONNECTIONS ................ 6-22
TRANSISTORS AND
INTEGRATED CIRCUITS .... 6-24
SOLDERING TECHNIQUES .... 6-24
REMOVAL AND REPLACEMENT
INSTRUCTIONS .......................... 6-25
Cabinet .................................... 6-25
CTM Circuit Board .................. 6-25
Display Circuit Board .............. 6-27
Cathode-Ray Tube .................. 6-28
Power-Supply Shield .............. 6-29
Filter Circuit Board .................. 6-29
Alt Sweep Circuit Board ........ 6-29
Attenuator and Logic Switch
Circuit Board .......................... 6-30
Timing Circuit Board .............. 6-31
Bottom Shield, Attenuator and
Timing Circuit-Board Module .. 6-32
Front-Panel Circuit Board .... 6-32
Main Circuit Board .................. 6-34
REPACKAGING FOR SHIPMENT 6-35
SELECTABLE COMPONENTS .. 6-36
SECTION 7 OPTIONS
SECTION 8 REPLACEABLE ELECTRICAL PARTS
SECTION 9 DIAGRAMS
SECTION 10 REPLACEABLE MECHANICAL
PARTS
ACCESSORIES
CHANGE INFORMATION

2236 Service
LIST OF ILLUSTRATIONS
Figure Page Figure Page
1-1 Maximum input voltage vs frequency 3-12 Typical waveforms for the Delay function
derating curve for CH 1 OR X & DMM, CH 2 with Valt LO
.............................................. 3-30
OR .and EXT INPUT connectors ............ 1-17 3-13 Typical waveforms for the Delta Time func-
1-2 Physical dimensions of the 2236 Oscillo- tion with Valt HI
........................................ 3-31
scope ..........................................................
1-18 3-14 Typical waveforms for the Delta Time func-
tion with Valt L O ........................................ 3-32
2-1 Optional power cords
................................
2-1
2-2 Fuse holder and power cord connector ... 2-2 4-1 Test setup for DMM common mode check . 4-21
2-3 Power and display controls and indicators
and PROBE ADJUST output .................... 2-3
2-4 Vertical controls and connectors
................ 2-3 6-1 Multi-connector holder orientation
............ 6-7
2-5 Horizontal controls
....................................
2-5 6-2 Period measurement loop test waveforms . 6-19
2-6 Trigger controls, connector, and indicator . 2-6 6-3 Width measurement loop test waveforms . 6-20
2-7 Counter, timer, and multimeter controls and 6-4 DMM serial interface loops test waveforms 6-21
indicator ......................................................
2-8
2-8 Multimeter right side panel connectors .... 2-10
2-9 Rear panel connector
................................
2-10 9-1 Color codes for resistors and capacitors
2-10 Graticule measurement markings
.............. 2-11 9-2 Semiconductor lead configurations
2-11 Probe compensation
..................................
2-15 9-3 Locating components on schematic dia-
grams and circuit board illustrations
9-4 Oscilloscope basic block diagram
3-1 Block diagram of the Vertical Attenuators . 3-4 9-5 Oscilloscope detailed block diagram
3-2 Block diagram of the Channel Switching 9-6 CTM basic block diagram
circuitry ......................................................
3-6 9-7 CTM detailed block diagram
3-3 Block diagram of the A Sweep Generator 9-8 Circuit board location illustration
and Logic circuitry ......................................
3-11 9-9 A2-Attenuator board
3-4 Block diagram of the Horizontal Amplifier . 3-15 9-10 A15-Logic Switch board
3-5 Simplified diagram of the Dc Restorer 9-11 Al-Main board
circuitry ......................................................
3-17 9-12 Circuit view of Al-Main board
3-6 Simplified diagram of the Period measure- 9-13 A3-Front Panel board
ment circuitry ..............................................
3-23 9-14 Circuit view of A3-Front Panel board
3-7 Typical waveforms for the Nongated Period 9-15 A4-Timing board
function ......................................................
3-24 9-16 A5-Altn Sweep logic board
3-8 Typical waveforms for the Gated Period 9-17 A6-Filter board
function ......................................................
3-25 9-18 A12-Multimeter Control board
3-9 Simplified diagram of the Width measure- 9-19 A10-Counter/Timer/Multimeter board
ment circuitry ..............................................
3-25 9-20 A14-Hot Signal Switch board
3-10 Typical waveforms for the Width function . 3-26 9-21 A13-Display board
3-11 Typical waveforms for the Delay function 9-22 Partial A11-Counter/Timer/Multimeter board
with Valt HI ................................................
3-29 with Option 14
iv REV JAN 1985

2236 Service
LIST OF TABLES
Table Page Table Page
1-1 Electrical Characteristics
..........................
. 1-2 5-3 Deflection Accuracy Limits
......................
. 5-9
1-2 Environmental Characteristics
....................
. 1-16 5-4 Settings for Bandwidth Checks
..............
. 5-12
1-3 Physical Characteristics
..........................
. 1-17 5-5 Settings for Timing Accuracy Checks .... . 5-17
5-6 Switch Combinations for A Triggering
2-1 VERT MODE Trigger Source
....................
. 2-7 Checks ......................................................
. 5-22
2-2 Power-up Checks
......................................
. 2-12 5-7 Dc Voltage Readout Checks
....................
. 5-27
2-3 Equipment Required for 10X Probe 5-8 Ac Voltage Readout Checks
....................
. 5-27
Compensation ............................................. 2-16 5-9 Dc Probe Readout Checks
......................
. 5-28
5-10 Ac Probe Readout Checks
......................
. 5-29
4-1 Test Equipment Required
..........................
. 4-2 5-11 Resistance Readout Checks
....................
. 5-29
4-2 Deflection Accuracy Limits
........................
. 4-5
4-3 Settings for Bandwidth Checks
..............
. 4-7
4-4 Settings for Timing Accuracy Checks .... . 4-10 6-1 Relative Susceptibility to Static-Discharge
4-5 Switch Combinations for A Triggering Damage
......................................................
. 6-1
Checks ......................................................
. 4-12 6-2 External Inspection Checklist
....................
. 6-3
4-6 Dc Voltage Readout Checks
......................
. 4-17 6-3 Internal Inspection Checklist
......................
. 6-3
4-7 Ac Voltage Readout Checks
....................
. 4-17 6-4 Power Supply Limits and Ripple
................
. 6-8
4-8 Dc CH 1 Readout Checks
........................
. 4-18 6-5 Control Switches Verification Readout . . . . 6-12
4-9 Dc Probe Readout Checks ......................
. 4-18 6-6 Channel 1 Logic Verification
....................
. 6-12
4-10 Ac.CH 1 Readout Checks
........................
. 4-18 6-7 Test 1-ROM Check Test Messages
........
. 6-13
4-11 Ac Probe Readout Checks
......................
. 4-18 6-8 Test 2-Counter Error Messages
..............
. 6-14
4-12 Resistance Readout Checks
....................
. 4-19 6-9 Test 3-DMM Test Error Codes
................
. 6-16
6-10 Test 4 Extended Counter Error Messages . 6-17
5-1 Adjustment Interactions
..........................
. 5-2 6-11 Maintenance Aids
....................................
. 6-23
5-2 Power Supply Limits
................................
. 5-4 6-12 Trigger Bandwidth Alternation
................
■ 6-36
v

2236 Service
OPERATORS SAFET SUMMAR
The general safety information in this part of the summary is for tooth operating and servicing personnel. Specific warnings and
cautions will be found throughout the manual where they apply and do not appear in this summary.
Terms in This Manual
CAUTION statements identify conditions or practices that
could result in damage to the equipment or other property.
WARNING statements identify conditions or practices that
could result in personal injury or loss of life.
Terms as Marked on Equipment
CAUTION indicates a personal injury hazard not immedi
ately accessible as one reads the markings, or a hazard to
property, including the equipment itself.
Grounding the Product
This product is grounded through the grounding conductor
of the power cord. To avoid electrical shock, plug the power
cord into a properly wired receptacle before connecting to
the product input or output terminals. A protective ground
connection by way of the grounding conductor in the power
cord is essential for safe operation.
Danger Arising From Loss of Ground
Upon loss of the protective-ground connection, all accessi
ble conductive parts (including knobs and controls that may
appear to be insulating) can render an electric shock.
DANGER indicates a personal injury hazard immediately ac
cessible as one reads the marking.
Symbols in This Manual
This symbol indicates where applicable
cautionary or other information is to be found.
For maximum input voltage see Table 1-1.
Use the Proper Power Cord
Use only the power cord and connector specified for your
product.
Use only a power cord that is in good condition.
For detailed information on power cords and connectors see
Figure 2-1.
Symbols As Marked on Equipment
DANGER — High voltage.
Protective ground (earth) terminal.
ATTENTION — Refer to manual.
Power Source
This product is intended to operate from a power source
that does not apply more than 250 volts rms between the
supply conductors or between either supply conductor and
ground. A protective ground connection by way of the
grounding conductor in the power cord is essential for safe
operation.
Use the Proper Fuse
To avoid fire hazard, use only a fuse of the correct type,
voltage rating and current rating as specified in the parts list
for your product.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in an explo
sive atmosphere unless it has been specifically certified for
such operation.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product covers
or panels. Do not operate the product without the covers
and panels properly installed.
vi

2236 Service
SERVICING SAFET SUMMAR
FOR Q ALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary.
Do Not Service Alone
Do not perform internal service or adjustment of this prod
uct unless another person capable of rendering first aid and
resuscitation is present.
Use Care When Servicing With Power On
Dangerous voltages exist at several points in this product.
To avoid personal injury, do not touch exposed connections
or components while power is on.
Disconnect power before removing protective panels, sol
dering, or replacing components.
Power Source
This product is intended to operate from a power source
that does not apply more than 250 volts rms between the
supply conductors or between either supply conductor and
ground. A protective ground connection by way of the
grounding connector in the power cord is essential for safe
operation.

2236 Service
viii
The 2236 Oscilloscope.

Section 1—2236 Service
SPECIFICATION
INTRODUCTION ACCESSORIES
The TEKTRONIX 2236 oscilloscope is a lightweight 100-
MHz instrument with a Counter, Timer, and Multimeter
(CTM). Measurement values are displayed on the Vacuum
Fluroescent nine-digit readout.
The dual vertical channel system supplies calibrated de
flection factors from 2 mV per division to 5 V per division.
Trigger circuits enable stable triggering over the full band
width of the vertical system. The horizontal system provides
calibrated sweep speeds from 0.5 s per division to 50 ns per
division, along with delayed-sweep features. A X10 magni
fier circuit extends the maximum sweep speed to 5 ns per
division when the A and B SEC/DIV switch is set to 0.05 ns.
The Counter Timer section of the CTM measures fre
quency, period, width, and totalizes, and provides a digital
readout of oscilloscope delay time and delta time. It also
provides frequency, period, and width measurements and
totalizes on portions of a waveform selected by the intensi
fied zone (gated measurements). Counting and timing mea
surements are made through the A and B Trigger system.
All Counter Timer measurement values are displayed on the
readout.
The Multimeter section of the CTM measures voltages
and resistance through the floating input connectors located
on the right side of the instrument. Voltages can also be
measured through the CH 1 or X & DMM connector. Tem
perature measurements can be made by connecting the op
tional temperature probe to the Multimeter input
connectors. The Multimeter measurement values are dis
played with a 3 3/4-digit (5000 count) format, on the digital
readout.
The instrument is shipped with the following standard
accessories:
1 Operators manual 2 Multimeter test lead clips
1 Probe package 2 Multimeter test leads
1 Power cord
For part numbers and information about instrument ac
cessories, refer to the tabbed “Accessories” part of the Re
placeable Mechanical Parts section in the back of this
manual.
The service manual and all other optional accessories are
orderable from Tektronix, Inc. A local Tektronix Field Office,
representative, or the Tektronix product catalog can provide
ordering and product information.
PERFORMANCE CONDITIONS
The following electrical characteristics (Table 1-1) are
valid for the 2236 when it has been adjusted at an ambient
temperature between +18°C and +28°C, has had a warm
up period of at least 30 minutes, and is operating at an
ambient temperature between 0°C and +50°C (unless oth
erwise noted).
Items listed in the “Performance Requirements" column
are verifiable qualitative or quantitative limits, while items
listed in the “Supplemental Information" column are either
explanatory notes, calibration setup descriptions, perfor
mance characteristics for which no absolute limits are speci
fied, or characteristics that are impractical to check.
Environmental characteristics are given in Table 1-2. The
2236 meets the requirements of MIL-T-28800C, paragraphs
4.5.5.1.3, 4.5.5.1.4, and 4.5.5.1.2.2 for Type III, Class 5
equipment, except where otherwise noted.
Physical characteristics of the instrument are listed in Ta
ble 1-3.
REV JAN 1985 1-1

Specification—2236 Service
Table 1-1
Electrical Characteristics
Characteristics Performance Requirements Supplemental Information
VERTICAL DEFLECTION S STEM
Deflection Factor
Range 2 mV per division to 5 V per division
in a 1-2-5 sequence
5 mV per division to 5 V per division
gain is adjusted with VOLTS/DIV switch
set to 10 mV per division.
2 mV per division gain is adjusted
with VOLTS/DIV switch set to 2 mV
per division
Accuracy
+15°C to +35°C ±2%.
0°C to +50°C ±3%.a
Range of VOLTS/DIV Variable Control Continuously variable between
settings. Increases deflection factor
by at least 2.5 to 1.
Step Response
Rise Time
0°C to +35°C
5 mV per Division to 5 V per
Division 3.5 ns or less.8
Rise time is calculated from the formula:
0.35
Bandwidth (—3 dB)
2 mV per Division 3.9 ns or less.8
+35°C to +508C
5 mV per Division to 5 V per
Division 3.9 ns or less.8
2 mV per Division 4.4 ns or less.8
Aberrations
Positive-Going Step
2 mV per Division +5%, -5% , 5% p-p.
Measured with 5-division reference
signal, centered vertically, from a
50 fl source driving a 50 0 coaxial cable
terminated in 50 fi at the input connector
with the VOLTS/DIV Variable control in
the CAL detent.
5 mV per Division to 0.5 V
per Division +4%, -4% , 4% p-p.
1 V per Division to 5 V per
Division + 14%, -14%, 14% p-p.8
Bandwidth (-3 dB)
0°C to +35°C
5 mV per Division to 5 V per
Division Dc to at least 100 MHz.
Measured with a vertically centered
6-division reference signal from a 50 0
source driving a 50 Q coaxial cable
that is terminated in 50 0, both at
the input connector and at the probe
input, with the VOLTS/DIV Variable
control in the CAL detent.
2 mV per Division Dc to at least 90 MHz.
+35°C to +50°C
5 mV per Division to 5 V per
Division. Dc to at least 90 MHz.8
2 mV per Division Dc to at least 80 MHz.8
•Performance Requirement not checked in Service Manual.
1-2

Specification—2236 Service
Table 1-1 (cont)
Characteristics Performance Requirements Supplemental Information
VERTICAL DEFLECTION S STEM (cont)
Bandwidth (cont)
AC Coupled Lower Limit 10 Hz or less at —3 dB.a
Bandwidth Limiter Upper limits (—3 dB) bandpass at
20 MHz ±10%.
Chop Mode Switching Rate 500 kHz ±30%.®
Input Characteristics
Resistance
Channel 1 1 MS2 ±0.2%a
Channel 2 1 MSt ± 2%a
Capacitance
(Channels 1 and 2) 22 pF ±0.5 pFa
Maximum Safe Input Voltage
DC Coupled 400 V (dc + peak ac) or 800 V ac p-p
to 10 kHz or less.3
See Figure 1-1 for derating curve.
AC Coupled 400 V (dc + peak ac) or 800 V ac p-p
to 10 kHz or less.3
Common-Mode Rejection Ratio
(CMRR) At least 10 to 1 at 50 MHz. Checked at 10 mV per division for
common-mode signals of 6 divisions or
less with VOLTS/DIV Variable control
adjusted for best CMRR at 50 kHz.
Input Current 1.0 nA or less (0.5 division trace shift
at 2 mV per division).3
Trace Shift with Attenuator Rotation 0.75 division or less.3 VOLTS/DIV Variable control in CAL
detent.
Trace Shift as VOLTS/DIV
Variable Control is Rotated 1.0 division or less.3
Trace Shift with Invert 1.5 division or less.3
Channel Isolation Greater than 100 to 1 at 50 MHz.
POSITION Control Range At least ±11 divisions from graticule
center.
1-3
■Performance Requirement not checked in Service Manual.

Specification—2236 Service
Characteristics
Table 1-1 (cont)
Performance Requirements Supplemental Information
TRIGGER S STEM
A TRIGGER Sensitivity
P-P AUTO and NORM Modes
A Sweep
Internal
External trigger signal from a 50 0
source driving a 50 0 coaxial cable
terminated in 50 0 at the input connector.
Trigger sensitivities define signal
amplitude required for stable display.
10 MHz 60 MHz 100 MHz
0.35 div 1.2 div 1.5 div
External 40 mV 150 mV 250 mV
Counter
Internal 0.5 div 1.5 div 2.0 div
External 50 mV 160 mV 300 mV
Lowest Useable Frequency in P-P
AUTO Mode 20 Hz with 1.0 division internal
or 100 mV external.®
TV FIELD Mode 1.0 division of composite sync.®
B TRIGGER Sensitivity (Internal Only)
B Sweep
10 MHz 60 MHz 100 MHz
0.35 div 1.2 div 1.5 div
Counter 0.5 div 1.5 div 2.0 div
EXT INPUT
Maximum Input Voltage 400 V (dc + peak ac) or 800 V ac p-p
at 10 kHz or less.® See Figure 1-1 for derating curve.
Input Resistance 1 Mfi ±2%.®
Input Capacitance 22 pF ±2.5 pF.®
AC Coupled 10 Hz or less at lower —3 dB point.®
Offset 25 mV or less.
LEVEL Control Range
A TRIGGER (NORM)
INT Can be set to any point of the trace
that can be displayed.®
EXT, DC At least ± 1.6 V, 3.2 V p-p.
EXT, DC - 10 At least ±16 V, 32 V p-p.®
B TRIGGER (Internal only) Can be set to any point of the trace
that can be displayed.®
VAR HOLDOFF Control Increases A Sweep holdoff time by at
least a factor of 10.®
■Performance Requirement not checked in Service Manual.
1-4

Specification—2236 Service
Table 1-1 (cont)
Characteristics Performance Requirements Supplemental Information
TRIGGER S STEM (cont)
LEVEL Control Range (cont)
Trigger View System
Deflection Factor
Internal Same as vertical.
External
AC and DC 100 mV per division.
DC ± 10 1 V per division.
Accuracy ±20%.
Delay Difference Between EXT
INPUT and Either Vertical
Channel
Less than 2.0 ns.a
HORIZONTAL DEFLECTION S STEM
Sweep Rate
Calibrated Range
A Sweep 0.5 s per division to 0.05 /us per
division in a 1-2-5 sequence. XI0
magnifier extends maximum sweep
speed to 5 ns per division.
B Sweep 50 ms per division to 0.05 /ts per
division in a 1-2-5 sequence. XI0
magnifier extends maximum sweep
speed to 5 ns per division.
Accuracy
+ 15°C to +35°C
Unmagnified Magnified Sweep accuracy applies over the
center 8 divisions. Exclude the first
25 ns of the sweep for magnified
sweep speeds and anything beyond
the 100th magnified division.
±2% ±3%
0°C to +50°C ±3%a ±4% a
POSITION Control Range Start of sweep to 10th division will
position past the center vertical
graticule line in XI or 100th division in
X I0.
Sweep Linearity ±5%. Linearity measured over any 2 of the
center 8 divisions. With magnifier in XI0,
exclude the first 25 ns and anything past
the 100th division.
Variable Control Range Continuously variable between
calibrated settings. Extends the A and
B sweep speeds by at least a factor of
2.5.
1-5
•Performance Requirement not checked in Service Manual.

Specification—2236 Service
Table 1-1 (cont)
Characteristics Performance Requirements Supplemental Information
HORIZONTAL DEFLECTION S STEM (C<>nt)
Sweep Length Greater than 10 division.
A/B SWP SEP Range ± 3.5 divisions or greater.
Delay Time
Dial Control Range
Applies to 0.5 its per division
and slower
<0.5 +300 ns to >10 divisions.
Jitter One part or less in 10,000 (0.01%) of
the maximum available delay time.
X- OPERATION (X I MAGNIFICATION)
Deflection Factors Same as Vertical Deflection System
(with VOLTS/DIV Variable controls in
CAL detent).
Accuracy
X-Axis
+ 15°C to +35°C ±3%.
Measured with a dc-coupled, 5-division
reference signal.
0°C to +50°C ± 4%.a
-Axis Same as Vertical Deflection System.8
Bandwidth (-3 dB)
X-Axis Dc to at least 2.5 MHz.
Measured with a 5-division
reference signal.
-Axis Same as Vertical Deflection System.8
Phase Difference Between X- and
-Axis Amplifiers ±3° from dc to 50 kHz.8 With dc-coupled inputs.
PROBE ADJUST
Output Voltage of PROBE ADJUST 0.5 V ±5%.
Jack
Repetition Rate 1 kHz ± 20%a.
Z-AXIS INPUT
Sensitivity 5 V causes noticeable modulation. Useable frequency range is
Positive-going input decreases
intensity. dc to 20 MHz.
Maximum Safe Input Voltage 30 V (dc + peak ac) or 30 VC p-p ac at
1 kHz or less.8
Input Resistance 10 kft ±10%.8
■Performance Requirement not checked in Service Manual.
1-6 REV JAN 1985

Specification— 2236 Service
Table 1-1 (cont)
Characteristics Performance Requirements Supplemental Information
COUNTER-TIMER
Frequency
Maximum Input Frequency
Ranges Maximum
Resolution®
100 Hz
1 kHz 0.00001 Hz 0.0001 Hz
10 kHz
100 kHz 0.001 Hz 0.01 Hz
1 MHz
10 MHz
100 MHz
0.1 Hz
1 Hz
10 Hz
Same as trigger specifications.®
Minimum Displayable
Frequency 0.20000 Hz.®
Time Base Error
Standard ±1 X 10-5 (10 parts per million.)
Less than 5 X 10~6 change per year.®
Option 14 ±5 X 10-7 (0.5 parts per million.)
Less than 1 X 10~7 change per
month.®
Nongated Mode (Hz)
Resolution Error [tC'4NTJE)F’ iLso]
Accuracy Resolution Error ± (TBE)F
Gated Mode (Hz)
Resolution Error
Accuracy Resolution Error ± Frequency
Gating Error ± (TBE)F.
Gating Error
TJE = Trigger jitter error (seconds).
F = Frequency of input (Hz).
N = Number of input samples accumulated = F(0.25 second ±0.01 second) S=1.
LSD = One count in least significant digit.
TBE = Time base error (fractional).
G = Number of gate intervals in one measurement = (A sweep repetition rate) (0.25 second ±0.01 second) ^ 1.
Ng = Number of samples inside one gate interval > 1 .
■Performance Requirement not checked in Service Manual.
■Reduces to ± LSD for pulse inputs with transition times < 20 ns.
1-7

Specification— 2236 Service
Table 1-1 (cont)
Characteristics Performance Requirements Supplemental Information
COUNTER-TIMER (cont)
Period
Minimum Input Period
Ranges Maximum
Resolution*
5s
1 s
100 ms
1 MS
100 ns
10ns
10 ms
1 ms
100 ms
1 ns
100 ps
10 ps
See trigger specifications.
Maximum Displayable
Period 5 seconds.3
Nongated Mode (seconds)
Resolution Error T 1.4 TJE lor/ | aB
I 1 N IL S D J
Accuracy Resolution Error ± (TBE)P.®
Gated Mode (seconds)
Resolution Error T 1.4 TJE lc.r/ | ab
± —, ± LSD
L NgVG J
Accuracy Resolution Error ± Time Interval
Gating Error ± (TBE)P.
Time Interval Gating Error 2 ns
Width Ranges Maximum
Resolution*
5s
1 s
100 ms
1 MS
100 ns
10 ns
10 ms
1 ms
100 MS
1 ns
100 ps
10 ps
TJE = Trigger jitter error (seconds).
P = Period of input (seconds)
N = Number of input samples accumulated = F(0.25 second ±0.01 second) >1.
LSD = One count in least significant digit.
TBE = Time base error (fractional).
G = Number of gate intervals in one measurement = (A sweep repetition rate) (0.25 second ±0.01 second) >1.
Ng = Number of samples inside one gate interval >1.
•Performance Requirement not checked in Service Manual.
•Reduces to ± LSD for pulse inputs with transition times < 20 ns.
1-8

Specification— 2236 Service
Table 1-1 (cont)
Characteristics Performance Requirements Supplemental Information
COUNTER-TIMER (cont)
Width (cont)
Minimum Input Width 5 ns.a
Maximum Displayable Width 5 seconds.3
Nongated Mode (seconds)
Resolution Error ± -4 - (TJE of leading edge
L v N 10 nslac
± TJE of trailing edge) ± j
Accuracy Resolution Error ± (TBE)W ±
Hysteresis Error ± 10 ns. Checked in A TRIGGER NORM MODE.
Gated Mode (seconds)
Accuracy Resolution Errord ± (TBE)W ±
Hysteresis Error ± Time Interval
Gating Error ± 10 ns.
Hysteresis
Error (seconds) f Sensitivity / 1
[ 2 \slew rate of trailing edge
1 r
slew rate of leading edge/J
Sensitivity See A and B TRIGGER sensitivities
expressed in divisions on screen.3 Slew rate expressed in divisions
on screen.
Delay Time Ranges Maximum
Resolution3
5s
1 s
100 ms
1 MS
100 ns
10 ns
10 ms
1 ms
100 MS
1 ns
100 ps
10 ps
TJE = Trigger jitter error (seconds).
N = Number of input samples accumulated = F(0.25 second ±0.01 second) >1.
TBE = Time base error (fractional).
W = Width being measured in seconds.
Performance Requirement not checked in Service Manual.
cReduces to ± io nsec for pulse inputs with transition times < 2 0 ns.
V *
dSame as resolution error in nongated mode.
*Reduces to 5 ns for pulse inputs with transition times < 20 ns and trigger level centered on waveform.
7-9

Specification—2236 Service
Table 1-1 (cont)
Characteristics Performance Requirements Supplemental Information
COUNTER-TIMER (cont)
Delay Time (cont)
Minimum Displayable Delay
Time 500 ns.a
Maximum Displayable Delay
Time 2.5 seconds.3
B Triggered After Delay
(seconds)
Resolution Error [ ± —7— (TJE of leading edge ±TJE
L V 10 nslaf
of trailing edge) ± — —-
V G J
Accuracy Resolution Error d (TBE)Td ± 20 ns.
Delta Time Ranges Maximum
Resolution3
5s 1 MS
1 s 100 ns
100 ms 10 ns
10 ms 1 ns
1 ms 100 ps
lOOps 10 ps
Maximum Displayable
Delta Time 2.5 seconds3
B Runs After Delay (seconds)
Resolution Error 2(delay time jitter) 10 nsec3
~ yjG \/G
Accuracy Resolution Error ± (TBE)TA.
G = Number of gate intervals in one measurement = (A sweep repetition rate) (0.25 second ±0.01 second) >1.
TBE = Time base error (fractional).
Td = Delay time being measured in seconds.
TJE = Trigger jitter error (seconds).
TA = Delta time being measured in seconds.
■Performance Requirement not checked in Service Manual.
'Reduces to ± io nsec for pulse inputs with transition times < 2 0 ns.
VG
1-10 REV OCT 1983