Tektronix 2225 User manual

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

Copyright © Tektronix, Inc., 1987,1986. All rights reserved. Contents of this
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: [phone]; 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 ................................................... iv
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
ff
©
A
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