TEK 222 Manuale utente

TCZL/’ SERVICE 070-7459-00

ILPi MANUAL Product Group 41

222

Digital Storage

Oscilloscope

Service

WARNING

THE FOLLOWING SERVICING INSTRUCTIONS ARE

FOR USE BY QUALIFIED PERSONNEL ONLY. TO

AVOID PERSONAL INJURY, DO NOT PERFORM ANY

SERVICING OTHER THAN THAT CONTAINED IN

OPERATING INSTRUCTIONS UNLESS YOU ARE

QUALIFIED TO DO SO. REFER TO OPERATORS

SAFETY SUMMARY AND SERVICE SAFETY

SUMMARY PRIOR TO PERFORMING ANY SERVICE.

First Printing mar 1990 Scan by John Barnes Tfektronix

COMMIT TED TO EXCELLENCE

cation may not be reproduced in any form without the written permission of

Tektronix, Inc.

Products of Tektronix, Inc. and its subsidiaries

foreign patents issued and pending.

TEKTRONIX, TEK, SCOPE-MOBILE, and

are covered by U.S. and

are registered trademarks

of Tektronix, Inc.

Printed in U.S.A. Specification and price change privileges are reserved.

222 Service

TABLE OF CONTENTS

Page

LIST OF ILLUSTRATIONS iii

LIST OF TABLES iii

OPERATORS SAFETY SUMMARY iv

SERVICING SAFETY SUMMARY iv

SECTION 1PERFORMANCE CHARACTERISTICS

INTRODUCTION 1-1

RECOMMENDED

PERFORMANCE CHECK

SCHEDULE 1-1

ELECTRICAL

SPECIFICATIONS 1-1

VERTICAL DEFLECTION

SYSTEM 1-1

TRIGGER SYSTEM 1-3

HORIZONTAL SYSTEM 1-3

X-Y OPERATION 1-4

RS-232 INTERFACE 1-4

EXTERNAL POWER

REQUIREMENTS 1-4

ENVIRONMENTAL

SPECIFICATIONS 1-5

MECHANICAL

SPECIFICATIONS 1-5

SECTION 2OPERATING INFORMATION

SAFETY 2-1

BATTERY-CHARGER

ADAPTER 2-1

EXTERNAL SUPPLY

VOLTAGE 2-1

BATTERY OPERATION 2-2

FIRST TIME BATTERY

OPERATION 2-2

START-UP 2-2

AUTO TIMEOUT 2-2

VIEWING ASIGNAL QUICKLY 2-2

TIPS ON BATTERY CARE 2-2

Page

ALTERNATE METHOD FOR

BATTERY CHARGING 2-3

BATTERY REPLACEMENT 2-3

SECTION 3BLOCK DIAGRAM OVERVIEW

INTRODUCTION 3-1

ACQUISITION SYSTEM 3-1

TIME BASE 3-4

PROCESSOR SYSTEM 3-4

DISPLAY SYSTEM 3-7

BATTERY CHARGER

REGULATOR 3-9

POWER SUPPLY 3-10

SECTION 4PERFORMANCE CHECK

PROCEDURE

INTRODUCTION 4-1

TEST EQUIPMENT

REQUIRED 4-1

PERFORMANCE

CONDITIONS 4-1

PERFORMANCE CHECK

INTERVAL 4-1

PREPARATION 4-1

INDEX TO PERFORMANCE

CHECK PROCEDURE 4-5

DISPLAY CHECKS 4-6

INITIAL CONTROL SETTINGS ... 4-6

PROCEDURE 4-6

VERTICAL 4-7

INITIAL CONTROL SETTINGS ... 4-7

PROCEDURE 4-7

HORIZONTAL 4-11

INITIAL CONTROL SETTINGS .. 4-11

PROCEDURE 4-11

TRIGGER 4-12

INITIAL CONTROL

SETTINGS 4-12

PROCEDURE 4-12

222 Service

SECTION 5

SECTION 6

Page Page

ADJUSTMENT PROCEDURE

INTRODUCTION 5-1

TEST EQUIPMENT 5-1

LIMITS AND TOLERANCES 5-1

ADJUSTMENTS AFFECTED BY

CIRCUIT BOARD

REPLACEMENT 5-1

PREPARATION FOR

ADJUSTMENT 5-1

PROCEDURE STEPS 5-2

PREPARATION 5-2

ADJUSTMENTS 5-2

TROUBLESHOOTING 6-5

INTRODUCTION 6-5

TROUBLESHOOTING AIDS 6-5

TROUBLESHOOTING

TECHNIQUES 6-5

CORRECTIVE MAINTENANCE 6-8

INTRODUCTION 6-8

REPACKAGING FOR

SHIPMENT 6-8

MAINTENANCE

PRECAUTIONS 6-8

REMOVAL AND REPLACEMENT

PROCEDURES 6-9

SECTION 7OPTIONS AND ACCESSORIES

INTRODUCTION 7-1

MAINTENANCE OPTIONS 7-1

STATIC-SENSITIVE

COMPONENTS 6-1 SECTION 8-REPLACEABLE ELECTRICAL PARTS

PREVENTIVE MAINTENANCE 6-2

INTRODUCTION 6-2

INSPECTION AND CLEANING ... 6-2 SECTION 9-DIAGRAMS

LUBRICATION 6-4

PERIODIC READJUSTMENT 6-4 SECTION 10- REPLACEABLE MECHANICAL PARTS

222 Service

LIST OF ILLUSTRATIONS

Figure Page

1-1 Maximum normal-mode voltage versus frequency derating curve 1-2

2Maximum common-mode voltage versus frequency derating curve 1-3

1External Power Input 2-1

1Simplified block diagram of the 222 DSO 3-2

3-2 Floating Acquisition System 3-3

3-3 Time Base block diagram 3-4

3-4 Processor System simplified block diagram 3-5

3-5 Display System 3-8

3-6 Battery Charger block diagram 3-9

7Power Supply block diagram 3-10

1RS-232 interconnection cable wiring between aPC XT® (or compatible)

and the 222 4-4

2Trigger Jitter check 4-14

1Locations at which horizontal and vertical gains are adjusted 5-3

5-2 Rear Panel adjustments 5-3

5-3 Top accessible adjustments 5-4

5-4 CHI and CH2 Input Compensation 5-5

5Clock Delay adjustment 5-6

1Circuit board locations 6-10

LIST OF TABLES

Table Page

4-1 Test Equipment Required 4-2

4-2 VOLTS/DIV Accuracy Settings 4-9

6-1 Relative Susceptibility to Static-Discharge Damage 6-1

6-2 External Inspection Checklist 6-2

6-3 Internal Inspection Checklist 6-3

6-4 Power Up Error Codes 6-5

6-5 Self Cal Error Codes 6-6

6-6 Index To Self Cal Procedures 6-7

6-7 Error Codes Occurring During Normal Operations 6-7

iii

222 Service

OPERATORS SAFETY SUMMARY

The safety information in this summaryis for operatingpersonnel. Warnings andcautions will also be foundthroughout

the manual where they apply.

Terms in this Manual Symbols as Marked on Equipment

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 apersonal injury hazard not

immediately accessible as one reads the markings, or a

hazard to property, including the equipment itself.

DANGER -High voltage.

ATTENTION -Refer to manual.

[51 DOUBLE INSULATED -No safety ground

required.

Safety Grounding

DANGER indicates apersonal injury hazard This instrument is double insulated and does not

immediately accessible as one reads the marking. use or require asafety-grounding conductor.

Symbols in this Manual

Indicates where applicable cautionary or

other information is to be found. For

maximum input voltage ratings, see

the Specifications.

Do Not Operate in an Explosive Atmosphere

To avoid explosion, do not operate this product in

an explosive atmosphere unless the product is

certified for such operation.

Do Not Remove Covers or Panels

Indicates that the instrument is double

insulated. Asafety earth ground is

not needed.

To avoid personal injury, do not remove the prod-

uct covers or panels. Do not operate the product

without the covers and panels properly installed.

SERVICING SAFETY SUMMARY

FOR QUALIFIED SERVICE PERSONNEL ONLY

Refer also to the preceding Operators Safety Summary

Do Not Service Alone Disconnect power and remove the battery before

removing protective panels, soldering, or replacing

Do not perform internal service or adjustment of this components,

product 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.

Section 1—222 Service

PERFORMANCE CHARACTERISTICS

INTRODUCTION

Performance characteristics given in the Electrical

Specifications apply when the instrument has been self

calibrated within ±5°C of the ambient temperature, has

warmed up at least 20 minutes, and is operating in an

ambient temperature between -10°C and +55°C

(unless otherwise noted).

Environmental and Mechanical Specifications are listed

after the Electrical Specifications.

RECOMMENDED PERFORMANCE

CHECK SCHEDULE

To ensure accurate measurements, check the perform-

ance of this instrument every 2000 hours of operation

(once each year if used infrequently). If repairs are made,

affected circuits may need to be readjusted.

ELECTRICAL SPECIFICATIONS

VERTICAL DEFLECTION SYSTEM

Deflection Factor

5mV per division to 50 Vper division in a1-2-5

sequence.1

Vertical Resolution

VOLTS/DIV Variable Control

Increases the deflection factor by 2.5 to 1

Aberrations

+6%, -6%, 6% p-p or less. 1

Measured with a5-division reference signal from a

50-n source driving a50-n load at the probe tip.

Vertically center the top of the reference signal.

Useful Rise Time

Rise time is limited to 35 ns by the vertical amplifier

response.

Useful Bandwidth

SAMPLE SEC/DIV

Useful-storage bandwidth is limited to the

frequency where there are 10 samples per sine-

wave signal period at the maximum sampling rate.

This yields amaximum amplitude error of 5%.Maxi-

mum sampling rate is 10 MHz at 5ps per division.

8-bits, 25 levels per division. 10.24 divisions of

dynamic range.1

DC Accuracy

+15°C to +35°C ±3%.2

-15°C to +15°C ±4%.2

+35°C to +55°C ±4%.2

'Performance Requirement not checked in manual.

’When the eetf calibration haa been done within ±5°C of the

ambient temperature.

Accuracy at the useful-storage-bandwidth limit is

measured with respect to a6-division, 50-kHz sine

wave.

REPETITIVE

0.5 ps/div to 50 ps/div 10 MHz.

1ps/div 5MHz.1

2pS/div 2.5 MHz.1

Repetitive bandwidth is limited to 10 MHz by the

analog system.

1-1

Performance Characteristics -222 Service

PEAK DETECT (ENV and CONT ENV acquisition

modes at 20 jis per division and slower)

Sine-wave Amplitude Capture

(5% p-p maximum amplitude

uncertainty) 1MHz.

Pulse Width Amplitude Capture

(50% p-p maximum amplitude

uncertainty). 100 ns.

A/D Converter Linearity

Monotonic with no missing codes. 1

Input Current

2.5 nA or less (0.5 division or less trace shift when

switching between DC and GND input coupling with

the VOLTS/DIV switch at 5mV per division). 1

Input Rand C

Input Resistance 1Mfl ±10%.1

Input Capacitance 27pF±3pF.1

These R and Ccharacteristics include the probe.

Common-to-Ground

Capacitance Less than 150 pF. 1

Position Control Range

±12 divisions.

Maximum Rated Normal-Mode Input

Voltage (probe tip to probe common)

Input Linear Range

±20 divisions. 1

400 V(dc +peak ac) to 2MHz.1

See Figure 1-1 for voltage versus frequency

derating curve.

DC Balance

0.2 division or less trace shift when switching

between VOLTS/DIV switch settings when the

ambient temperature is within ±5°C of the tem-

perature at which the last self calibration was done. 1

INVERT Balance

0.4 division or less trace shift when switching

between INVERT and non-INVERT displays when

the ambient temperature is within ±5°C of the tem-

perature at which the last self calibration was done.1

Maximum Common-Mode Potential

(probe common to chassis)

400 V(dc +peak ac) to 1kHz. 1

See Figure 1-2 for voltage versus frequency

derating curve.

AMaximum Rated Potential Between

Channels

800 V(dc +peak ac). 1

^40°

uj «280

-r -c 200

160

°+120

=* CJ

S80

100

11Ii!!

mmmmamwmatmm PHImmm 5mamma iamm

bhh mm H.'Vi aam aaa

HiHHHHiHI HMHlHiHHHH^ 1

alm

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kHz 1MHz 2MHz 10 MHz

FREQUENCY 7100-2J

Figure 1-1. Maximum normal-mode voltage versus frequency derating curve.

1-2

Performance Characteristics -222 Service

Figure 1-2. Maximum common-mode voltage versus frequency derating curve.

Common-Mode Rejection Ratio

DC-to-1 kHz 80 dB or more. 1

1kHz-to-100 kHz 60 dB or more. 1

Isolation: Channel Signal to Channel Signal

DC-to-10MHz 80 dB or more. 1

Isolation: Channel Common to Channel

Signal

DC-to-1 kHz 80 dB or more. 1

1kHz-to-100 kHz 60 dB or more.1

TRIGGER SYSTEM

Internal

Sensitivity 0.5 division to 20 MHz.

Level ±20 divisions. 1

External

Sensitivity 250 mV at 10MHz.

Level ±2.3 V.

Input Resistance 1Mn ±10%.1

Input Capacitance 18 pF ±5 pF. 1

'Performance Requirement not checked in manual.

Trigger Jitter

2ns/div to 50 ns/div (5 ns/div in XI 0MAG).

XI 1/50th division ±2 ns. 1

XI 0MAG 1/5th division ±2 ns.

HORIZONTAL SYSTEM

Range

50 ns per division to 20 sper division. 1

The XI 0MAG control extends the maximum sweep

speed to 5 ns per division.

Displayed Accuracy

XI ±2%.

XI 0MAG ±5%.1

Accuracy is over 10 divisions.

Sample Rate

-SL_ hz 1

NORMAL SEC/DIV

PEAKDET (ENV and

CONTENV) 10 MHz.1

REPETITIVE

50 ns/div to 1jis/drv 10MHz.1

2ns/div 5MHz.1

ACCURACY 0.01 %.'

Sample accuracy is based on the accuracy of the

20-MHz oscillator.

1-3

Performance Characteristics -222 Service

Record Length

512 data points; calibrated to 50 points per

division. 1

POSITION Control Range

Start of the first division and end of the tenth division

can be positioned past the center vertical graticule.

Displayed Trace Length

10.24 divisions.1

X-Y OPERATION

Accuracy

Same as the Vertical system. 1

Useful Bandwidth

—-—Hz 1

SEC/DIV

Skew Between CH 1and CH 2

5ns. 1

RS-232 INTERFACE

Maximum Applied Voltage (any pin)

25 V(dc +peak ac).1

Baud Rates

300, 1200, 2400, 9600; 0.1 %accuracy based on

the microprocessor clock. 1

Signals

RD, TD, and SGND. SGND is connected internally to

EXTERNAL TRIG COM. DSR and CTS are always

high, and DTR and RTS are ignored. 1

Levels

Compatible with RS-232C.

EXTERNAL POWER REQUIREMENTS

Voltage Range

Pin-to-pin

AC 16.0 to 20 Vac

at 47 to 400 Hz.1

DC 12 to 28 Vdc.1

Either Power Pin-to-EXT

TRIG COMM or RS-232

COMM -0.5 Vto 28 Vac

peak. 1

Current

1ampere maximum when charging batteries.1

Maximum Power Consumption

15 watts or 16 volt-amperes (when charging

batteries). 1

Internal Batteries

Battery

Sealed, lead-acid battery. 1

Charge Time

Three hours for full charge with oscilloscope not

operating. 1

Battery Excessive Discharge Protection

Instrument operation is automatically interrupted

when battery charge drops to 7.32 V. 1

Typical Operating Time

Two hours at maximum sample rate, no trigger, and

AUTO TIMEOUT feature turned off .’

Battery Capacity versus Temperature

-15°C 20°Cto30°C 55 °C

80% 100% 110%

'Performance Requirement not checked In manual.

1-4

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