Tektronix 2225 Manual de usuario

TEK 070-6298-01

PRODUCT GROUP 46

2225 OSCILLOSCOPE

AND OPTIONS

OPERATOR’S MANUAL

First Printed October 1986

UK Revised October 1987 Tte tronix

CO ITTED TO EXCELLENCE

publication may not be reproduced in any form without the written permis

sion of Tektronix, Inc.

Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and

foreign patents issued and pending.

Information in this publication supersedes that in all previously published

material. Specification and price change privileges reserved. TEKTRONIX,

TEK, PLOT 10, TEKTEST, SCOPE- OBILE, and ® are registered

trademarks. For further information, contact Tektronix, Inc.

Corporate Offices, P.O. Box 500, Beaverton, OR 97077. Phone: (503)

627-7111; TWX: (910) 467-8708; TLX: 151754. Subsidiaries and distributors

worldwide.

Printed in U.K.

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.

B000000 Tektronix, Inc., Beaverton, Oregon, USA

100000 Tektronix, Guernsey, Ltd., Channel Islands

200000 Tektronix United Kingdom, Ltd, London

300000 SonyATektronix, Japan

700000 Tektronix Holland, NV, Heerenveen,

The Netherlands

NOTICE to the user/operator:

The German Postal Service requires that Systems assembled by the

operator/user of this instrument must also comply with Postal

Regulation, Vfg. 1046/1984, Par. 2, Sect. 1.

HINWEIS fur den Benutzer/Betreiber:

Die vom Betreiber zusammengestellte Anlage, innerhalb derer dies

Gerat eingesetzt wird, mu/3 ebenfalls den Voraussetzungen nach Par. 2,

Ziff. 1 der Vfg. 1046/1984 genugen.

NOTICE to the user/operator:

The German Postal Service requires that this equipment, when used in a

test setup, may only be operated if the requirements of Postal

Regulation, Vfg. 1046/1984, Par. 2, Sect. 1.7.1 are complied with.

HINWEIS fur den Benutzer/Betreiber:

Dies Gerat darf in Medaufbauten nur betrieben werden, wenn die

Voraussetzungen des Par. 2, Ziff. 1.7.1 der Vfg. 1046/1984 eingehalten

werden.

Certificate of the Manufacturer/lmporter

We hereby certify that the 2225 o s c illo s c o p e

_______________________

_____________________

AND ALL INSTALLED OPTIONS

_____________________

complies with the RF Interference Suppression requirements of

Amtsbl.-Vfg 1046/1984.

The German Postal Service was notified that the equipment is being

mar eted.

The German Postal Service has the right to re-test the series and to

verify that it complies.

TEKTRONIX

Bescheinigung des Herstellers/lmporteurs

Hiermit wird bescheinigt, da/3 der/die/das 2225 OSCILLOSCOPE

_______

___________________AND ALL INSTALLED OPTIONS

__________________

in Ubereinstimmung mit den Bestimmungen der Amtsblatt-Verfugung

1046/1984 fun entstort ist.

Der Deutschen Bundespost wurde das Inver ehrbringen dieses Gerates

angezeigt und die Berechtigung zur Uberprufung der Serie auf Einhalten

der Bestimmungen eingeraumt.

TEKTRONIX

CONTENTS Page

List of Illustrations.................................................................... iii

List of Tables............................................................................ iii

Operator’s Safety Summary

...................................................

The 2225 Oscilloscope........................................................... vi

SECTION 1— Preparation for Use

Safety....................................................................................... 1-1

Line Voltage Selection............................................................. 1-1

Line Fuse.................................................................................. 1-2

Power C ord.............................................................................. 1-5

Instrument Cooling

................................................................

1-5

Initial Start-up .......................................................................... 1-5

SECTION 2— Operation

Front Panel Organization ....................................................... 2-1

Controls, Connectors, and Indicators

....................................

2-1

Learning the Controls ............................................................. 2-5

Display Controls

......................................................................

2-6

Vertical Controls

......................................................................

2-7

Input Coupling

Channel Selection

ADD and INVERT

CHOP or ALT?

Increasing the Sensitivity

Horizontal Controls ................................................................. 2-8

Sweep-Speed Selection

agnifying Waveform Details

Trigger Controls

......................................................................

2-9

Which ode to Use

Source

Coupling

Slope

Level

Holdoff

Connecting Signals................................................................. 2-11

Waveform Fidelity and Probe Grounds

Probe Compensation

Probe Handling

Coaxial Cables

2225 Operators I

SECTION 3— Applications

Amplitude easurements ..................................................... 3-1

Peak-to-Peak Voltage

Instantaneous Voltage

Algebraic Addition

Common- ode Rejection

Amplitude Comparison (Ratio)

Time easurements ............................................................... 3-7

Time Duration

Period and Frequency

Rise Time

Time Difference Between Pulses on Time-

Related Signals

Phase Difference

Television Displays

..................................................................

3-15

TV Field Signals

TV Line Signals

Z- odulation .......................................................................... 3-16

SECTION 4— Chec s and Adjustments

Trace Rotation.......................................................................... 4-1

Probe Compensation ............................................................. 4-1

SECTION 5— Performance Characteristics

SECTION 6— Options and Accessories

Standard Accessories ........................................................... 6-1

Options

............................................................

6-1

Optional Accessories ............................................................. 6-3

APPENDIX A— Magnified Sweep Speeds

APPENDIX B— Repac aging for Shipment

2225 Operators

ILLUSTRATIONS

Figure Page

1 -1 Voltage selector switch, fuse, and power-cord

receptacle

................................................................

1-4

3-1 easuring peak-to-peak voltage on a waveform........ 3-1

3-2 Instantaneous voltage measurement

.........................

3-3

3-3 Common-mode rejection

............................................

3-5

3-4 Determining voltage ratio............................................. 3-6

3-5 easuring time duration............................................. 3-8

3-6 easuring rise tim e

....................................................

3-9

3-7 Time difference between pulses on time-related

signals

......................................................................

3-11

3-8 Phase difference.......................................................... 3-13

3- 9 High-resolution phase difference..................................3-14

4- 1 Probe compensation

..................................................

4-2

4- 2 Locating the low-frequency compensation

adjustment................................................................. 4-3

5- 1 Derating curve for CH 1 OR X, CH 2 OR Y, and

EXT INPUT connectors

................................................

5-7

TABLES

Table Page

1 -1 Power Plugs and Line Voltage Selection

....................

1-3

2-1 Summary of Controls, Connectors, and Indicators ... 2-2

5-1 Electrical Characteristics............................................. 5-1

5-2 Environmental Characteristics

...................................

5-6

5- 3 echanical Characteristics

.......................................

5-7

6- 1 Power Cords and Fuses............................................... 6-2

6-2 Optional Accessories

..................................................

6-3

III2225 Operators

Operators Safety Summary

OPERATOR'S SAFETY SUMMARY

The general safety information in this summary is for both operat

ing and servicing personnel. Specific warnings and cautions—

found throughout the manual where they apply— 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.

As Mar ed on Equipment

CAUTION indicates a personal-injury hazard that is not imme

diately accessible as one reads the markings, or a hazard to

property, including the equipment itself.

DANGER indicates a personal-injury hazard that is immedi

ately accessible as one reads the marking.

Symbols

In This Manual

A This symbol indicates applicable cautionary or other

information. For maximum input voltage see Table 5-1.

As Mar ed on Equipment

DANGER— High voltage.

Protective ground (earth) terminal.

ATTENTION— Refer to manual.

IV 2225 Operators

Operators Safety Summary

Power Source

This product is intended to operate from a power source that

does not apply more than 250 V rms between the supply conduc

tors 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.

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 making any connections to the

product input or output terminals. A protective ground connec

tion, 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 accessible

conductive parts— including knobs and controls that may

appear to be insulating— can render an electric shock.

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.

Read Section 1 for power-cord and connector information.

Use the Proper Fuse

To avoid fire hazard, use only a fuse of the correct type, voltage

rating and current rating specified on the back of your product

and in Table 6-1.

Do Not Operate in an Explosive Atmosphere

To avoid explosion, do not operate this product in an explosive

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.

2225 Operators v

The 2225 Oscilloscope

THE 2225 OSCILLOSCOPE

The TEKTRONIX 2225 Oscilloscope is a rugged, lightweight,

dual-channel, 50- Hz instrument that features a bright, sharply

defined trace on an 80 by 100 mm cathode-ray tube (crt).

Its low-noise vertical system supplies calibrated deflection factors

from 5 mV to 5 V per division at full bandwidth. Using the vertical

magnification feature extends sensitivity to 500 jxV per division—

four times the maximum sensitivity of previous 2200-Series Oscil

loscopes. This same magnification function permits independent

bandwidth limiting for each channel. With it, a user can limit one

channel’s bandwidth to 5 Hz without affecting the bandwidth of

the other channel.

Stable triggering is achieved over the full bandwidth of the vertical

system. The flexibility and high sensitivity of the trigger system

provide a range of conveniences such as hands-free triggering

with the peak-to-peak automatic mode, independent selection of

TV line and TV field triggering at any sweep speed, single-sweep

triggering, and a variable holdoff control to facilitate triggering on

complex waveforms. Besides having standard AC and DC signal

coupling methods, the 2225 also gives the user the ability to filter

out high-frequency and low-frequency components of the trigger

ing signal. An external triggering signal or an external Z-axis

modulation signal can be applied via a front-panel connector and

the source-selector switches.

The horizontal system provides calibrated sweep speeds from

0.5 s to 50 ns per division. For greater measurement accuracy, a

magnifier circuit extends the maximum sweep speed to 5 ns per

division. agnification is selected in three levels— X5, X10, and

X50— and the magnified trace can be displayed either alone or

together with the unmagnified trace. Displaying both the magni

fied and the unmagnified traces together— called Alternate ag

nification mode— lets the user perform types of timing

measurements that previously were only possible on oscillo

scopes having dual time bases.

VI 2225 Operators

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