Tektronix 222PS Operator's Manual

222PS
PowerScout
Power Systems Oscilloscope
Operator Manual

070-8097-02

Please check for change information at the rear
of this manual.

Second Edition: December 1993
Last Revised: September 29, 1994

Instrument Serial Numbers

Each instrument manufactured by Tektronix has a serial number on a panel
insert or tag, or stamped on the chassis. The first letter in the serial number
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:

B010000 Tektronix, Inc., Beaverton, Oregon, USA
E200000 Tektronix United Kingdom, Ltd., London
J300000 Sony/Tektronix, Japan
H700000 Tektronix Holland, NV, Heerenveen, The Netherlands

Instruments manufactured for Tektronix by external vendors outside the United
States are assigned a two digit alpha code to identify the country of manufacture
(e.g., JP for Japan, HK for Hong Kong, IL for Israel, etc.).

Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077

Printed in U.S.A.

Copyright
are covered by U.S. and foreign patents, issued and pending. The following are
registered trademarks: TEKTRONIX, TEK, TEKPROBE, and SCOPEĆMOBILE.

E Tektronix, Inc., 1991, 1993. All rights reserved. Tektronix products

WARRANTY

Tektronix warrants that this product will be free from defects in materials
and workmanship for a period of three (3) years from the date of
shipment. If any such product proves defective during this warranty
period, Tektronix, at its option, either will repair the defective product
without charge for parts and labor, or will provide a replacement in
exchange for the defective product.

In order to obtain service under this warranty, Customer must notify
Tektronix of the defect before the expiration of the warranty period and
make suitable arrangements for the performance of service. Customer
shall be responsible for packaging and shipping the defective product to
the servicecenter designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the
shipment is to a location within the country in which the Tektronix service
center is located. Customer shall be responsible for paying all shipping
charges, duties, taxes, and any other charges for products returned to any
other locations.

This warranty shall not apply to any defect, failure or damage caused by
improper use or improper or inadequate maintenance and care. Tektronix
shall not be obligated to furnish service under this warranty a) to repair
damage resulting from attempts by personnel other than Tektronix
representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible
equipment; or c) to service a product that has been modified or integrated
with other products when the effect of such modification or integration
increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS
PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR
OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH
OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER
TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE
POSSIBILITY OF SUCH DAMAGES.

Certificate of the Manufacturer/Importer

We hereby certify that the

SYSTEMS OSCILLOSCOPE AND ALL INSTALLED OPTIONS

222PS PowerScout POWER

complies with the RF Interference Suppression requirements
of Amtsbl.ĆVfg 1046/1984.

The German Postal Service was notified that the equipment is
being marketed.

The German Postal Service has the right to reĆtest the series
and to verify that it complies.

TEKTRONIX

Bescheinigung des Herstellers/Importeurs

Hiermit wird bescheinigt, daß der/die/das

POWER SYSTEMS OSCILLOSCOPE AND ALL INSTALLED OPTIONS

222PS PowerScout

in Übereinstimmung mit den Bestimmungen der AamtsblattĆ
Verfugüng 1046/1984 funkentstört ist.

Der Deutschen Bundespost wurde das Inverkehrbringen
dieses Gerätes angezeigt und die Berechtigung zur ÜberĆ
prufüng der Serie auf Einhalten der Bestimmungen einĆ
geräumt.

TEKTRONIX

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 für den Benutzer/Betreiber:

Die vom Betreiber zusammengestellte Anlage, innerhalb
derer dies Gerät eingesetzt wird, muß 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 für den Benutzer/Betreiber:

Dies Gerät darf in Meßaufbauten nur betrieben werden, wenn
die Voraussetzungen des Par. 2, Ziff. 1.7.1 der Vfg. 1046/1984
eingehalten werden.

Welcome

This manual contains the following sections:

H Overview describes the 222PS PowerScout and provides safety

information.

H At A Glance describes the controls and connectors for the 222PS.

H In Detail provides further detail on some aspects of the 222PS,

building on the information contained in At A Glance. The 15
topics of this chapter are in alphabetical order for your conveĆ
nience:

H Acquisition Modes

H Auto Setup

H Calibration

H Capturing Random Events

H Channels

H The Display

H Horizontal Operation

H Maintenance and Repair

H Power

H Probes

H Saving and Recalling Data

H Store Mode

H Triggering

H Vertical Operation

H XY Mode

H Tutorial: Measuring Signals provides stepĆbyĆstep instructions to

get you started making measurements quickly.

222PS Operator Manual

i

H Remote Communication provides information on RSĆ232 commuĆ

nication procedures between the 222PS and a PC.

H Performance Verification describes the procedures necessary to

verify that the 222PS is performing according to specifications.

H Specifications provides complete specifications for the 222PS

PowerScout.

H Accessories describes the standard and optional accessories

available for the 222PS.

H Glossary defines various words used in the text.

H The Index helps you locate information quickly.

NOTE

If you have never used an oscilloscope before, please
read the tutorial in Appendix A before using the 222PS.

ii

Welcome

List of Illustrations ix.....................................

List of Tables xiii..........................................

Overview

About the 222PS PowerScout 1Ć1......................

Safety 1Ć2............................................

At a Glance

Front Panel Controls 2Ć2...............................

The Display 2Ć6.......................................

Top Panel Controls 2Ć11................................

Side Connectors 2Ć13..................................

Rear Panel Controls and Connectors 2Ć14................

The Tilt Stand 2Ć16.....................................

Contents

Symbols and Terms 1Ć2.............................

Specific Precautions 1Ć3............................

Vertical Controls 2Ć3................................

Trigger Controls 2Ć4................................

Horizontal Controls 2Ć5.............................

Readouts 2Ć6......................................

Menus and Menu Buttons 2Ć9.......................

In Detail

Acquisition Modes 3Ć1.....................................

Kinds of Acquisition Modes 3Ć1........................

Normal Acquisition Mode 3Ć1........................

Average Acquisition Mode 3Ć1.......................

222PS Operator Manual

iii

Envelope Acquisition Mode 3Ć2......................

Continuous Envelope Acquisition Mode 3Ć2...........

Selecting an Acquisition Mode 3Ć3.....................

Auto Setup 3Ć5............................................

Procedure 3Ć5........................................

Parameter Effects 3Ć5.................................

Channels 3Ć5......................................

Vertical Scaling 3Ć6.................................

Horizontal Scaling 3Ć6..............................

Low and High Frequencies 3Ć6......................

Calibration 3Ć9............................................

Running the SelfĆCalibration Routine 3Ć9................

Capturing Random Events 3Ć15.............................

Channels 3Ć17.............................................

Selecting a Channel 3Ć17...............................

Displaying a Channel 3Ć18..............................

Setting Channel Coupling 3Ć19..........................

The Display 3Ć21...........................................

Readouts 3Ć21.........................................

Displaying and Clearing the Readouts 3Ć21.............

Inverting the Display 3Ć22...............................

Varying the Brightness 3Ć23.............................

Horizontal Operation 3Ć25..................................

Horizontal Positioning 3Ć25.............................

Seconds per Division 3Ć26..............................

Aliasing 3Ć26.......................................

TimeĆBase Mode 3Ć27...............................

Magnifying the Signal 3Ć29..............................

Maintenance 3Ć31..........................................

Identifying the Firmware Version 3Ć31....................

Repackaging for Shipment 3Ć33.........................

Power 3Ć35................................................

Battery Operation 3Ć35.................................

Connecting the Battery 3Ć35..........................

Charging the Battery 3Ć37............................

iv

Contents

Charging the Battery Externally 3Ć37...................

Time Out 3Ć37......................................

Replacing the Battery 3Ć39...........................

Storing the Instrument 3Ć40..........................

Deep Discharge 3Ć40................................

External Power Operation 3Ć41..........................

AC Line Operation 3Ć41..............................

Other Sources of External Power 3Ć42.................

Probes 3Ć43...............................................

Connecting the Probes 3Ć44............................

Configuring the Probes 3Ć45............................

Probe Accessories 3Ć47................................

Saving and Recalling Data 3Ć51.............................

Waveforms 3Ć51........................................

Saving a Waveform 3Ć51.............................

Recalling a Saved Waveform 3Ć53.....................

Setups 3Ć55............................................

Saving a Setup 3Ć55.................................

Recalling a Saved Setup 3Ć57........................

Erasing a Saved Setup 3Ć58..........................

Store Mode 3Ć61...........................................

Triggering 3Ć63.............................................

The Trigger Light 3Ć63..................................

Trigger Source 3Ć64....................................

External Triggering 3Ć65.............................

Motor Trigger Function 3Ć67.............................

Triggering on Motor Drive Signals 3Ć67................

Triggering on 50/60 Hz Line Signals 3Ć67...............

Trigger Coupling 3Ć69..................................

Trigger Slope 3Ć69......................................

Trigger Level 3Ć69......................................

AutoĆLevel 3Ć70.....................................

Trigger Position 3Ć70...................................

Trigger Modes 3Ć71.....................................

Normal 3Ć72........................................

AutoĆBaseline 3Ć72..................................

AutoĆLevel 3Ć72.....................................

222PS Operator Manual

v

Vertical Operation 3Ć75.....................................

Vertical Positioning 3Ć75................................

Volts per Division 3Ć76..................................

XY Mode 3Ć79..............................................

Entering and Exiting XY Mode 3Ć79......................

Positioning XY Waveforms 3Ć80.........................

Appendices

Appendix A: Tutorial AĆ1...................................

The Screen AĆ1.......................................

Measuring Voltage AĆ2.................................

Measuring Time AĆ5...................................

Appendix B: Remote Communication AĆ9...................

Introductory Information AĆ9...........................

Setting the Baud Rate AĆ11..............................

Command Formats AĆ13................................

FrontĆPanel Encoding AĆ20..............................

RSĆ232 Error Codes AĆ28...............................

Transfer Options AĆ30..................................

RSĆ232 Interface Specifications AĆ32....................

SingleĆSequence 3Ć73...............................

Setting the Trigger Mode 3Ć73........................

Variable Volts per Division 3Ć76.......................

Measuring PeakĆtoĆPeak Voltages AĆ3................

Using a Ground Reference Point AĆ4.................

Measuring RiseĆ or FallĆtime AĆ7.....................

Commands, Queries, and Responses AĆ13.............

Vertical Settings AĆ20................................

SEC/DIV Setting AĆ22................................

Trigger Positions, Slope, Source, and Mode Settings AĆ24

Acquisition Mode and Miscellaneous Settings AĆ26......

Status Messages AĆ28...............................

Diagnostic Error Codes AĆ28.........................

Transfer to a Local PC AĆ30...........................

Transfer via Modem AĆ30.............................

vi

Contents

RSĆ232 Communication Parameters AĆ32..............

Baud Rates AĆ32....................................

Levels AĆ33.........................................

Maximum Applied Voltage AĆ33.......................

Plotter/Printer Support AĆ33..........................

Messages AĆ33.....................................

Optional Accessories AĆ33..............................

CAT200 AĆ33.......................................

RSĆ232 Interconnection Cables AĆ34...................

Appendix C: Quick Checks AĆ37.............................

General Instructions AĆ37...............................

Conventions AĆ38......................................

Initial Setup Procedure AĆ39............................

Self Cal Tests AĆ39.....................................

Autoset Tests AĆ41.....................................

Appendix D: Performance Tests AĆ43........................

Prerequisites AĆ43......................................

Equipment Required AĆ44...............................

Preparation AĆ47.......................................

Preliminaries AĆ47......................................

Vertical Checks AĆ48...................................

Horizontal Check AĆ57..................................

Trigger Checks AĆ60....................................

Appendix E: Specifications AĆ65.............................

Nominal Traits AĆ65.....................................

Warranted Characteristics AĆ71..........................

Typical Characteristics AĆ76.............................

Appendix F: Accessories AĆ79...............................

Standard Accessories AĆ79.............................

Optional Accessories AĆ80..............................

Instrument Options AĆ81................................

External Power AC Adapter Options AĆ81.................

222PS Operator Manual

vii

Glossary & Index

Glossary GĆ1..............................................

Index IĆ1.................................................

viii

Contents

List of Illustrations

Figure 2Ć1:ă222PS Front Panel 2Ć2...........................

Figure 2Ć2:ăVertical Controls 2Ć3.............................

Figure 2Ć3:ăTrigger Controls 2Ć4.............................

Figure 2Ć4:ăHorizontal Controls 2Ć5..........................

Figure 2Ć5:ăVertical Readouts 2Ć7............................

Figure 2Ć6:ăSaved Waveform Readouts 2Ć8...................

Figure 2Ć7:ăTrigger and Horizontal Readouts 2Ć9...............

Figure 2Ć8:ăParts of a Menu 2Ć10..............................

Figure 2Ć9:ă222PS Top Panel 2Ć11............................

Figure 2Ć10:ăSide of 222PS, Storage Pouch Removed 2Ć13......

Figure 2Ć11:ă222PS Rear Panel 2Ć14..........................

Figure 2Ć12:ăThe 222PS With Tilt Stand 2Ć16...................

Figure 3Ć1:ăNormal, Average, and Envelope Signals 3Ć3........

Figure 3Ć2:ăThe Acquisition Menu 3Ć3........................

Figure 3Ć3:ăThe Auxiliary Functions Menu 3Ć10.................

Figure 3Ć4:ăThe Calibration Menu 3Ć10........................

Figure 3Ć5:ăThe Ground External Trigger Calibration Menu 3Ć12...

Figure 3Ć6:ăChannel One Selected 3Ć17.......................

Figure 3Ć7:ăThe Channel Menu 3Ć18...........................

Figure 3Ć8:ăThe Display Menu 3Ć21...........................

Figure 3Ć9:ăNormal and Inverted Waveforms 3Ć22...............

Figure 3Ć10:ăThe Horizontal Controls 3Ć25.....................

Figure 3Ć11:ăAn Aliased Waveform 3Ć27.......................

Figure 3Ć12:ăThe Auxiliary Functions Menu 3Ć32................

Figure 3Ć13:ăXY Alignment Menu 3Ć32.........................

Figure 3Ć14:ăThe Firmware Version 3Ć33.......................

Figure 3Ć15:ăSide View Without Battery Cover 3Ć36..............

Figure 3Ć16:ăThe Auxiliary Functions Menu 3Ć38................

Figure 3Ć17:ăThe Configuration Menu 3Ć38.....................

Figure 3Ć18:ăSide View Showing Probe Connectors

(Pouch Removed) 3Ć44......................................

Figure 3Ć19:ăThe Auxiliary Functions Menu 3Ć45................

222PS Operator Manual

ix

Figure 3Ć20:ăThe Configuration Menu 3Ć46.....................

Figure 3Ć21:ăThe Probe Menu 3Ć46............................

Figure 3Ć22:ăProbe and Accessories 3Ć48......................

Figure 3Ć23:ăSaved Waveforms Menu 3Ć52.....................

Figure 3Ć24:ăSaved Waveform Parameters 3Ć53.................

Figure 3Ć25:ăThe Recall Waveforms Menu 3Ć54.................

Figure 3Ć26:ăThe Setup Menu 3Ć56............................

Figure 3Ć27:ăThe Save Setup Menu 3Ć56.......................

Figure 3Ć28:ăThe Recall Setup Menu 3Ć57......................

Figure 3Ć29:ăThe Erase Setups Menu 3Ć59.....................

Figure 3Ć30:ăHorizontal Readouts in Store Mode 3Ć61...........

Figure 3Ć31:ăTrigger Controls 3Ć63............................

Figure 3Ć32:ăThe Trigger Source Menu 3Ć64....................

Figure 3Ć33:ăRear Panel External Trigger Connectors 3Ć65.......

Figure 3Ć34:ăMotor Drive Signals Separated by a Low Region 3Ć68
Figure 3Ć35:ăMotor Drive Signals Separated by a High Region 3Ć68

Figure 3Ć36:ăTrigger Position Menu 3Ć71.......................

Figure 3Ć37:ăThe Trigger Mode Menu 3Ć74.....................

Figure 3Ć38:ăThe Vertical Controls 3Ć75........................

Figure 3Ć39:ăThe Display Menu 3Ć79..........................

Figure AĆ1:ăThe Screen Markings AĆ2........................

Figure AĆ2:ăMeasuring PeakĆtoĆPeak Voltages AĆ3.............

Figure AĆ3:ăMeasuring With Respect to Ground AĆ5............

Figure AĆ4:ăMeasuring Time AĆ6.............................

Figure AĆ5:ăMeasuring RiseĆTime AĆ8.........................

Figure AĆ6:ăRSĆ232 Communications Port AĆ10.................

Figure AĆ7:ăCommunication Between the 222PS and a PC AĆ10..

Figure AĆ8:ăThe Auxiliary Functions Menu AĆ11.................

Figure AĆ9:ăThe Configuration Menu AĆ12......................

Figure AĆ10:ăThe Baud Settings Menu AĆ12....................

Figure AĆ11:ăCommands, Queries, and Responses AĆ14.........

Figure AĆ12:ăRSĆ232 Interconnection Cable Pin Wiring AĆ34......

Figure AĆ13:ăInitial Setup for Vertical Checks AĆ49...............

Figure AĆ14:ăSetup for Input Coupling Check AĆ52..............

Figure AĆ15:ăSetup for Probe Compensation Check AĆ55........

Figure AĆ16:ăSetup for Analog Bandwidth Check AĆ56...........

x

Contents

Figure AĆ17:ăSetup for Horizontal Test AĆ58....................

Figure AĆ18:ăSetup for Trigger Checks AĆ61....................

Figure AĆ19:ăSetup for External Trigger Sensitivity Check AĆ63....

Figure AĆ20:ăMaximum NormalĆMode Voltage Versus

Frequency Derating Curve AĆ67...............................

Figure AĆ21:ăMaximum CommonĆMode Voltage Versus

Frequency Derating Curve AĆ68...............................

222PS Operator Manual

xi

xii

Contents

List of Tables

TableĂ3Ć1:ă Auto Setup Settings 3Ć7..........................

TableĂ3Ć2:ă TimeĆBase Modes 3Ć28............................

TableĂ3Ć3:ă AutoĆLevel Trigger Interval Time Limits 3Ć73..........

TableĂAĆ1:ăBUT Button Codes AĆ15...........................

TableĂAĆ2:ăDAC Code and Value Data AĆ17.....................

TableĂAĆ3:ăChannel Settings AĆ21.............................

TableĂAĆ4:ăSecondsĆperĆDivision and Misc. Settings AĆ23........

TableĂAĆ5:ăTrigger Position, Slope, Source, and Mode Settings AĆ25

TableĂAĆ6:ăAcquisition Mode and Misc. Settings AĆ27............

TableĂAĆ7:ă222PS Interconnect Pin Assignments AĆ34...........

TableĂAĆ8:ăTest Equipment AĆ45..............................

TableĂAĆ9:ăVoltsĆperĆDivision Accuracy Settings AĆ53............

TableĂAĆ10:ăNominal TraitsĊVertical System AĆ65..............

TableĂAĆ11:ăNominal TraitsĊHorizontal System AĆ68............

TableĂAĆ12:ăNominal TraitsĊTriggering System AĆ69............

TableĂAĆ13:ăNominal TraitsĊDisplay System AĆ69..............

TableĂAĆ14:ăNominal TraitsĊPower System AĆ70................

TableĂAĆ15:ăNominal TraitsĊCommunications Interface AĆ70.....

TableĂAĆ16:ăNominal TraitsĊMechanical AĆ71..................

TableĂAĆ17:ăWarranted CharacteristicsĊVertical System AĆ72....

TableĂAĆ18:ăWarranted CharacteristicsĊHorizontal System AĆ74.
TableĂAĆ19:ăWarranted CharacteristicsĊTriggering System AĆ74..
TableĂAĆ20:ăWarranted CharacteristicsĊ

ąąąEnvironmental, Safety, and Reliability AĆ75...............

TableĂAĆ21:ăTypical CharacteristicsĊVertical System AĆ76.......

TableĂAĆ22:ăTypical CharacteristicsĊHorizontal System AĆ77.....

TableĂAĆ23:ăTypical CharacteristicsĊTriggering System AĆ77.....

TableĂAĆ24:ăTypical CharacteristicsĊPower System AĆ77........

TableĂAĆ25:ăStandard Accessories AĆ79.......................

TableĂAĆ26:ăOptional Accessories AĆ80........................

222PS Operator Manual

xiii

TableĂAĆ27:ăInstrument Options AĆ81..........................

TableĂAĆ28:ăExternal Power AC Adapter Options AĆ81...........

xiv

Contents

This section summarizes the product features and safety precautions
of the 222PS PowerScout.

About the 222PS PowerScout

The Tektronix 222PS PowerScout is a portable digitizing oscilloscope.
It has two fully isolated, independently floatable channels rated to
600 VAC
oscilloscopes in the world with this feature.

The 222PS also has these features.

H light weight with a battery power source for field operations

H automatic setup button

H automatic triggering modes

H averaging and enveloping acquisition modes

H remote operationcapabilities via theRSĆ232 communications port

H internal memory for saving up to four waveforms and four instruĆ

ment setups

. The 222PS/224 digitizing oscilloscopes are the only

RMS

Overview

H DCĆtoĆ10ĂMHz signal bandwidth

H 10ĂMS/s digitizing rate

H 1 MHz single pass storage bandwidth

H Motor trigger

If you need more information about your Tektronix 222PS PowerScout
or other Tektronix products, contact the nearest Tektronix sales office
or distributor, consult the Tektronix product catalog, or, in the U. S., call
the Tektronix National Marketing Center tollĆfree at 1Ć800Ć426Ć2200.

222PS Operator Manual

1Ć1

Overview

Safety

You may be eager to begin using your Tektronix 222PS but please take
a moment to review these safety precautions. We provide them for
your protectionand to prevent damage to the 222PS PowerScout. This
safety information applies to all operators and service personnel.

WARNING

To avoid personal injury or damage to the 222PS, do not
apply more than 850ĂV peak between probe tip and earth
ground, between probe tip and probe common, or beĆ
tween probe common and earth ground.

WARNING

To avoid injury, use caution when working on equipment
with voltages above 42ĂV peak. Such voltages pose a
shock hazard.

1Ć2

WARNING

Do not float the external trigger common connector, the
RSĆ232 communications port, or the external power input
above 42ĂV peak. These inputs are not electrically isolated
from each other.

Symbols and Terms

These two terms appear in manuals:

H

result in damage to the equipment or other property.

H

result in personal injury or loss of life.

These two terms appear on equipment:

statements identify conditions or practices that could

statements identify conditions or practices that could

Overview

Overview

H CAUTION indicates a personal injury hazard not immediately

accessible as one reads the marking or a hazard to property
including the equipment itself.

H DANGER indicates a personal injury hazard immediately accessiĆ

ble as one reads the marking.

This symbol appears in manuals:

StaticĆSensitive Devices

These symbols appear on equipment:

DANGER

High Voltage

Protective

ground (earth)

terminal

ATTENTION

Refer to

manual

Specific Precautions

Observe all these precautions to ensure your personal safety and to
prevent damage either to the 222PS or to equipment connected to it.

Power Source Ċ The 222PS can use its selfĆcontained sealed lead

acid battery as a power source. It can also operate using power
supplied to the external power input. Power supplied to this input must
be 12 to 28ĂVDC or 16 to 20ĂVAC
power conductor negative by more than 0.5ĂV with respect to chassis
ground. Both conductors of the external power input are fused interĆ
nally. These fuses are not user accessible.

You can operate the instrument with external power operation from
local 110ĂV or 240ĂV power supply using the appropriate external
power AC adapter. Use only external power AC adapters specified for
this instrument.

. Do not force either external

RMS

222PS Operator Manual

1Ć3

Overview

Grounding the PowerScout Ċ The channel 1 and channel 2

measurement inputs of the 222PS are doubly insulated from each
other and all other accessible portions of the instrument cabinet. It is
not necessary to ground the instrument to avoid electric shock.

Fuse Ċ The 222PS has no userĆreplaceable fuses.

Do Not Disassemble the Cabinet Ċ To avoid personal injury, do

not operate the instrument without a properly assembled cabinet. The
cabinet of the instrument should be disassembled only by qualified
service personnel.

Do Not Operate in Explosive Atmospheres Ċ The 222PS

provides no explosion protection from static discharges or arcing
components. Do not operate the 222PS in an atmosphere of explosive
gasses.

Electric Overload Ċ Never apply a voltage to a probe or connector

on the 222PS that is outside the range specified for that probe or
connector.

1Ć4

Overview

At a Glance

This chapter describes the controls, connectors, and display readouts
of the 222PS PowerScout. It is intended to help orient you and to
provide basic information. For more detailed operating instructions for
various features, see the appropriate section in the chapter entitled In

Detail.

This section provides page references to the In Detail chapter for
further information.

222PS Operator Manual

2Ć1

At a Glance

Front Panel Controls

The front panel for the 222PS PowerScout appears as shown in
Figure 2Ć1.

1

2

3

4

65

2Ć2

Figure 2Ć1:ă222PS Front Panel

1. The display area includes the screen and associated buttons. The
screen shows signal traces, readouts, and menu items. Buttons
along the side of the screen allow you to manipulate menus. See
page 2Ć6 for a more complete description of the display area.

2. The vertical controls allow you to manipulate the vertical aspects
of your signal. See page 3Ć77 for a more complete description of
the vertical controls.

3. The trigger controls allow you to manipulate the aspects of your
signal having to do with triggering. See page 3Ć63 for a more
complete description of the trigger controls.

4. The horizontal controls allow you to manipulate the horizontal
aspects of your signal. See page 3Ć25 for more information on the
horizontal controls.

At a Glance

At a Glance

5. AUTO SETUP allows you to set up the instrument with the push
of a single button. Press this button for a quick, informative
display of any signal between 20 Hz and 1 MHz. See page 3Ć5 for
more information on the AUTO SETUP button.

6. The ON button toggles the instrument on or off. The instrument
beeps when it is turned on.

Vertical Controls

Figure 2Ć2 shows the vertical controls that are located on the front
panel.

321

Figure 2Ć2:ăVertical Controls

1. The outer knob sets the volts per division, which is the vertical
scale of your display. Turn the knob clockwise to decrease the
volts per division and counterclockwise to increase the volts per
division. See page 3Ć78 for more information on setting the volts
per division.

2. The inner knob sets the vertical position of the signal. Turn the
knob clockwise to move the signal towards the top of the screen
and counterclockwise to move the signal towards the bottom of
the screen. For more information on setting the vertical position
see page 3Ć77.

222PS Operator Manual

2Ć3

At a Glance

3. The 222PS can display signals acquired through either or both of

Trigger Controls

The trigger controls are on the front panel of the 222PS PowerScout.
They appear as shown in Figure 2Ć3.

You can also use this knob to change the size of a signal to an
arbitrary number of divisions. To do so, see page 3Ć78.

its two channels. The channel selector buttons allow you to select
the channel that is affected by changes to the controls. With these
buttons you can also select channel coupling or turn a channel off
so that the signal it is measuring is not displayed. For more
information on channels, see page 3Ć17.

12

2Ć4

3456

Figure 2Ć3:ăTrigger Controls

1. When you push the button labeled SLOPE, you toggle between a
positiveĆ and negativeĆtrigger slope. For more details, see
page 3Ć70.

2. When you push the button labeled MODE, you invoke a menu
that allows you to specify the trigger mode. For a complete
explanation of trigger modes, see page 3Ć72.

At a Glance

At a Glance

3. When you push the button labeled SOURCE, you invoke a menu
that allows you to specify the trigger source. For a complete
explanation of trigger sources, see page 3Ć64.

4. The light labeled TRIG'D turns on when the instrument is trigĆ
gered. See page 3Ć63 for more details.

5. The inner button, labeled AUTOLVL: PUSH, sets the trigger level
automatically. When you push it, it determines the peak values
and sets the trigger level to the midpoint of the signal. For more
information on this button, see page 3Ć71.

6. The outer knob sets the trigger level Ċ the threshold voltage the
signal must cross in order to trigger the instrument. Turn it clockĆ
wise to raise the trigger level; turn it counterclockwise to lower the
trigger level. For more information on the trigger level see
page 3Ć70.

Horizontal Controls

The horizontal controls are on the front panel of the 222PS PowerScĆ
out. They appear as shown in Figure 2Ć4.

Figure 2Ć4:ăHorizontal Controls

1. The outer knob sets the seconds per division. This is the horizonĆ
tal scale of your display. Turn the knob clockwise to decrease the
seconds per division; turn it counterclockwise to increase the
seconds per division. Setting the seconds per division is disĆ
cussed in more detail on page 3Ć26.

222PS Operator Manual

1

2

2Ć5

At a Glance

2. The inner knob sets the horizontal position of the signal. Turn the
knob clockwise to move the signal to the right. Turn it counterĆ
clockwise to move the signal to the left. For more information on
setting the horizontal position see page 3Ć25.

You can also use this knob to magnify the signal by ten times. To
do so, see page 3Ć29.

The Display

The 222PS display shows waveforms that represent electrical signals.
However, it also shows two other kinds of informationĊreadouts and
menus.

Readouts

Readouts are numeric or symbolic information associated with a
signal.

The 222PS displays readouts at three places on the screen: along the
top, along the bottom, and slightly above the bottom.

Readouts along the top show information associated with the vertical
controls. Readoutsalong the bottom show informationassociated with
the triggerand horizontal controls. The readoutsjust above them show
information associated with saved waveforms. Figures 2Ć5, 2Ć6, and
2Ć7 show these readouts.

2Ć6

Vertical Readouts Ċ Figure 2Ć5 shows the vertical readouts along

the top of the display. The readouts on the left refer to channel 1. The
readouts on the right refer to channel 2.

At a Glance

At a Glance

213

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

6754

Figure 2Ć5:ăVertical Readouts

1. The > indicates that the waveform is uncalibrated. For more
information on uncalibrated waveforms, see page 3Ć78.

2. The ~ indicates AC coupling. For more information on coupling,
see page 3Ć19.

A

indicates ground coupling.

3. This is the channel 2 coupling. The = indicates DC coupling.

4. The box around the channel information indicates that this chanĆ
nel is selected.

5. This number is the volts per division for channel 2 Ċ its vertical
scaling. For more details on vertical scaling, see page 3Ć78.

6. This number is volts per division for channel 1.

If either channel is off, the voltsĆperĆdivision number is
replaced by an OFF.

7. The downwardĆpointing arrow indicates that the channel is
inverted. For more information on inverting a channel, see
page 3Ć22.

222PS Operator Manual

NOTE

2Ć7

At a Glance

Saved Waveform Readouts Ċ Figure 2Ć6 shows the saved

waveform readouts above the bottomof the display. The readouts refer
to the last saved waveform displayed. For more information on saved
waveforms, see page 3Ć51.

21

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

54 3

Figure 2Ć6:ăSaved Waveform Readouts

2Ć8

1. This indicates that the waveform is uncalibrated. For more inforĆ
mation on uncalibrated waveforms see page 3Ć78.

2. This is the channel coupling for the saved waveform. For more
information on coupling see page 3Ć19.

3. This is the seconds per division setting for the saved waveform.

4. This is the volts per division setting for the saved waveform.

5. This is the memory location to which the waveform was saved. In
this case, the waveform is saved in memory location 1. See page
3Ć51.

Trigger and Horizontal Readouts Ċ Figure 2Ć7 shows the

horizontal and trigger readouts along the bottom of the display.

At a Glance

At a Glance

12

54 3

Figure 2Ć7:ăTrigger and Horizontal Readouts

1. The second from the left readout is the trigger slope. A + indiĆ
cates that triggering occurs on a rising edge. A - indicates that
triggering occurs on a falling edge. For more information on
trigger slope, see page 3Ć70.

2. The second from the right readout is the seconds per division Ċ
the horizontal scale factor. For more information on horizontal
scaling, see page 3Ć26.

3. At the right is the magnification indicator. For more details on the
magnification feature, see page 3Ć29.

4. The middle readout indicates that the instrument is in store mode.
For more information on store mode, see page 3Ć61.

5. At the left is the trigger level in volts. For more details on trigger
level see page 3Ć70.

Menus and Menu Buttons

Menus are lists of choices that you can select in order to perform some
action, such as placing the instrument in XY mode or turning off the
timeĆout feature.

A number of buttons on the front and top panels of the 222PS invoke
menus when pressed. When a menu is on the display, you can select
one of its items to perform an action. Figure 2Ć8 illustrates the parts of
a menu.

222PS Operator Manual

2Ć9

At a Glance

1

4

CHOICE 1NAME:

3

CHOICE 2

CHOICE 3

CHOICE 4

2

Figure 2Ć8:ăParts of a Menu

1. The button labeled CLEAR erases the menu from the display.

2. The menu buttons are next to the screen, along its right edge.
Pressing the button next to a menu item performs the action
represented by that item.

3. The menu items appear along the right edge of the display. Up to
four items can appear on a menu. Each represents a possible
action you can perform.

4. The name of the menu appears at the top left of the display,
followed by a colon.

2Ć10

At a Glance

Top Panel Controls

The top panel for the 222PS PowerScout appears as shown in FigĆ
ure 2Ć9.

At a Glance

1

8

7

23

56

4

Figure 2Ć9:ă222PS Top Panel

1. Pressing this button invokes a menu that allows you to recall
saved waveforms. See page 3Ć53.

2. Pressing this button toggles the instrument in or out of store
mode. For more information about store mode, see page 3Ć61.

3. Pressing this button invokes a menu that allows you to specify the
acquisition mode of the instrument. For more information about
acquisition modes, see page 3Ć1.

222PS Operator Manual

2Ć11

At a Glance

4. Pressing this button invokes a menu that allows you to specify

5. Pressing this button invokes a menu that allows you to execute a

whether to invert a channel, display signals in XY mode, or display
signal readouts. For more information about inverting channels,
see page 3Ć22. For more information about XY mode, see
page 3Ć81. For more information about displaying or clearing
signal readouts, see page 3Ć21.

variety of special functions. In some cases, you may execute
items from two or three layers of menus.

H You can check the display alignment and view the instrument

identification and firmware number. See page 3Ć9.

H You can start selfĆcalibration routines for either channel or the

external trigger input. See page 3Ć9.

H You can enable or disable the timeĆout feature, set the baud

rate, activate the modem, or select different probe types. For
more information about the timeĆout feature, see page 3Ć37.
For more information about setting the baud rate or activating
the modem, see page AĆ11. For more information about
configuring the 222PS for the correct probes, see page 3Ć45.

H You can enable or disable MOTOR TRIG, which places a

special filter in the trigger path to allow triggering on motor
drive signals that are pulseĆwidth modulated and on 50/60 Hz
line signals. See page NO TAG.

2Ć12

6. Pressing this button invokes a menu that allows you to specify the
trigger position. See page 3Ć71.

7. Pressing this button invokes a menu that allows you to save or
recall frontĆpanel setups. See page 3Ć55.

8. Pressing this button invokes a menu that allows you to save
waveforms. See page 3Ć51.

At a Glance

Side Connectors

The right side of the 222PS PowerScout appears as shown in FigĆ
ure 2Ć10.

Figure 2Ć10:ăSide of 222PS, Storage Pouch Removed

At a Glance

21

3

1. This is the probe connector for channel 1.

2. This is the probe connector for channel 2.

3. This is thebattery connection. See page 3Ć35 for more information
on connecting the battery.

The 222PScomes with an attached storage pouch. Store the probes in
the pouch when you are not using them. You do not need to disconĆ
nect the probes before you store them.

222PS Operator Manual

2Ć13

At a Glance

Rear Panel Controls and Connectors

The rear panel for the 222PS PowerScout appears as shown in FigĆ
ure 2Ć11.

1

876

23

Figure 2Ć11:ă222PS Rear Panel

4

5

2Ć14

1. This panel points to the probe inputs on the instrument's side and
indicates the 222PS maximum input voltage rating.

2. This is the RSĆ232 connection port for remote communications.
For more information on remote communications, see page AĆ9.

3. This is the instrument serial number. You will need it if you must
ever arrange to ship the instrument back for maintenance. For
more maintenance information, see page 3Ć31.

4. This knob focuses the 222PS screen. Insert a small screwdriver
into the slot and turn it to adjust the focus.

At a Glance

At a Glance

5. This knob varies the brightness of the 222PS screen. See
page 3Ć23 for more information on screen brightness.

6. This is the external trigger common reference connector. To use a
grounded reference with your external trigger source, connect the
reference signal here. See page 3Ć65.

WARNING

To avoid possible injury, do not connect the trigger comĆ
mon reference input to voltages greater than 42ĂV peak.
The trigger common reference input is not insulated.

7. This is the external trigger input connector. To use an external
signal as a trigger source, connect the external trigger signal here.
For more information on external triggering, see page 3Ć65.

WARNING

To avoid possible injury or damage to the 222PS or
equipment connected to it, do not float the external trigger
common connector, the RSĆ232 communications port, or
the external power input above 42ĂV peak. These inputs
are not electrically isolated from each other.

8. This is the external power input. Connect the External Power AC
Adapter to the input to run the instrument from line voltage. See
page 3Ć41 for more information on external power.

222PS Operator Manual

2Ć15

At a Glance

The Tilt Stand

The 222PS PowerScout comes with a tilt stand so that you can view
the frontĆpanel and screen more easily. The tilt stand folds under the
instrument when not in use. To use it, lift the instrument and pull the tilt
stand forward until the instrument rests on it.

Figure 2Ć12:ăThe 222PS With Tilt Stand

2Ć16

At a Glance

Acquisition Modes

Acquiring signals involves accepting an analog electrical signal,
sampling it, and producing a waveform. The 222PS allows you to
specify how the instrument acquires the signal and constructs a
waveform. This is the acquisition mode of the instrument.

Kinds of Acquisition Modes

The 222PS provides four acquisition modes: normal, average, enveĆ
lope, and continuous envelope. These modes help you to examine
and manage noisy signals.

Normal Acquisition Mode

Normal acquisition mode is the most common, and it is the instrument
default.

In normal acquisition mode, the instrument displays a waveform with
one sample point for each acquired point.

Average Acquisition Mode

Average acquisition mode displays a waveform that is the average of
the last four waveforms acquired. This mode is useful for reducing
random noise and displaying a cleaner signal.

Average acquisition mode works only when the instrument
is triggered. In auto level and autoĆbaseline trigger modes,
untriggered displays appear identical to those using
normal acquisition mode.

In auto baseline trigger mode, the instrument displays the
last waveform acquired; it is unaveraged.

222PS Operator Manual

NOTE

3Ć1

Acquisition Modes

Envelope Acquisition Mode

In envelope mode, the instrument displays the positive and negative
peak signal values that occur during a display sample interval. This
mode is useful for detecting glitches such as unwanted peaks in a
signal.

Envelope acquisition mode functions only for time base
settings between 20Ăms and 20Ăs per division. If you set the
instrument at a faster setting, it functions as if it were in
normal acquisition mode.

Envelope mode samples the signal at 10ĂMHz, thereby acquiring
many samples for each point it displays.

Because of the 10ĂMHz sampling rate, the instrument
cannot detect glitches that last less than 100Ăns.

NOTE

NOTE

3Ć2

Continuous Envelope Acquisition Mode

Continuous envelope mode is similar to envelope mode. The differĆ
ence is that continuous mode accumulates and displays peak values
until you press the button labeled INIT.

NOTE

Continuous envelope acquisition mode functions only for
time base settings between 20Ăms and 20Ăs per division. If
you specify a faster setting, the instrument functions as if it
were in normal acquisition mode.

Changes to most frontĆpanel control settings also act like the INIT
button, discarding the old waveform data and starting the envelope
sequence anew. The only frontĆpanel controls that do not affect
continuous envelope mode are the horizontal and vertical position
knobs and the trigger level knob.

In Detail

Figure 3Ć1 summarizes the effects of averaging and envelope modes
on a signal.

Figure 3Ć1:ăNormal, Average, and Envelope Signals

Selecting an Acquisition Mode

To choose an acquisition mode, follow these steps.

ĂĂStep 1:ăPress the ACQ button on the top panel to invoke the

acquisition menu.

The normal acquisition mode is boxed (as in Figure 3Ć2) unless
you have previously selected another acquisition mode.

Acquisition Modes

ĂĂStep 2:ăPress the button next to the acquisition mode you wish to

select. The acquisition mode takes effect, and the menu disapĆ
pears.

Figure 3Ć2:ăThe Acquisition Menu

222PS Operator Manual

NORMACQ:

ENV

AVG

CONT ENV

3Ć3

Acquisition Modes

3Ć4

In Detail

The 222PS allows you to obtain a readable display of a waveform by
pushing a single button. You can also set up the instrument in a
specific way and then save the setting in memory (see page 3Ć55).
This section discusses various automatic ways to set up the instruĆ
ment.

Procedure

If you wish to view a signal quickly, follow these steps.

ĂĂStep 1:ăConnect the probe tip to the signal you wish to see.

ĂĂStep 2:ăPress the button marked AUTO SETUP on the front

panel.

Pressing AUTO SETUP gets a quick, informative display of any signal
between 20 Hz and 1 MHz.

Parameter Effects

Auto Setup

The AUTO SETUP button has these effects on setup parameters.

Channels

When you press AUTO SETUP, the instrument first determines which
channels to display. It checks both probe tips for a signal on either
channel.

H If a channel is receiving a signal, the 222PS turns the channel on.

H If neither channel is receiving a signal, the 222PS turns on chanĆ

nel 1 and turns off channel 2.

222PS Operator Manual

3Ć5

Auto Setup

Vertical Scaling

The 222PS then determines the characteristics of the signal, so it can
produce a useful display.

The 222PS sets the vertical position to display the signal in the center
of the screen. If both channels have a signal, the 222PS displays both
signals.

The instrument also sets the volts per division to display each signal
with several divisions of amplitude.

Horizontal Scaling

If only one channel is receiving a signal, the 222PS sets the horizontal
position to display 1-5 waveform cycles. It determines the peak
values and sets the trigger level at the midpoint.

If both channels have a signal, the instrument uses the channel 1
signal to set the seconds per division and trigger level. If the two
signals are synchronized, they both appear stable. Otherwise, the
channel 2 signal is untriggered.

Low and High Frequencies

3Ć6

AUTO SETUP avoids the timeĆbase modes used with the slower time
scales. It therefore does not set the seconds per division to 0.1 s or
slower and does not produce a readable display for signals slower
than 20ĂHz.

For signals with frequencies above 100ĂkHz, AUTO SETUP always
uses a secondsĆperĆdivision setting of 5Ă
The 222PS may display such highĆfrequency signals with too many or
too few cycles on the screen; therefore, they may appear confusing.
You may need to make small corrections to the seconds per division
knob to get a useful display.

Table 3Ć1 shows all AUTO SETUP actions.

ms to minimize search time.

In Detail

TableĂ3Ć1:ă Auto Setup Settings

Auto Setup

Control

VOLTS/DIV As determined by signal

VOLTS/DIV VAR Calibrated

Coupling AC if in AC before, and if a signal exists; otherwise

Acquisition mode Normal

STORE/NONSTORE NONSTORE

Invert Off (not inverted)

XY Display Off

SEC/DIV

Trigger source Vertical

Trigger mode Auto level

Trigger position Post

Trigger slope Plus

Trigger level Midpoint of signal

X10 MAG Off

Readouts On

Setting After Auto Setup

DC if a signal exists; otherwise OFF

As determined by signal; 5Ăms for signals above
100ĂkHz

Selected channel Channel 1 if signal exists, or if channel 2 has no

signal

NOTE

AUTO SETUP does not disable the motor trigger selection.

222PS Operator Manual

3Ć7

Auto Setup

3Ć8

In Detail

Calibration

The 222PS has a vertical channel selfĆcalibration routine to maintain
best balance and accuracy with temperature variations.

Running the SelfĆCalibration Routine

To achieve the specified performance, you should recalibrate the
222PS any time the ambient temperature has changed by more than
5° C. If the trace jumps when you rotate the volts per division knob
with no signal applied, the instrument probably needs recalibration.

To run the selfĆcalibration routine, follow these steps.

ĂĂStep 1:ăDisconnect both probes from the signal source.

NOTE

To ensure that the selfĆcalibration routine produces accuĆ
rate results, do not run the selfĆcalibration routine while
either probe is connected to a signal source.

ĂĂStep 2:ăPress the AUX FUNCT button on the top panel to display

the auxiliary functions menu. The display appears as shown in
Figure 3Ć3.

222PS Operator Manual

3Ć9

Calibration

ALIGNAUX:

SELF CAL

CONFIG

MOTOR TRIG

Figure 3Ć3:ăThe Auxiliary Functions Menu

ĂĂStep 3:ăPress the menu button next to the SELF CAL menu item

to access the calibration menu. The display now appears as
shown in Figure 3Ć4.

3Ć10

CH1SELF CAL:

CH2

EXT TRIG

PROBE

Figure 3Ć4:ăThe Calibration Menu

NOTE

The PROBE selection on the SELF CAL menu is for use by
qualified service personnel only.

In Detail

Calibration

ĂĂStep 4:ăTo begin the selfĆcalibration routine for channel 1, press

the menu button next to CH1.

This routine takes about a minute to perform. When it is finished,
the instrument displays PASS or FAIL.

If PASS appears on the screen, channel 1's recalibration was
successful.

If FAIL appears on the screen, run the calibration routine again. If
the failure persists, refer the instrument to a qualified service
person.

If the selfĆcalibration routine fails, the instrument sends a coded
error message. To capture this message, connect the instrument
to a terminal (or a PC emulating a terminal) through the RSĆ232
port on the rear panel and run the failed routine again. See
Appendix B: Remote Communications for a discussion of the error
codes.

ĂĂStep 5:ăNow calibrate channel 2. Invoke the menu again, and

press themenu button next to CH2. Follow the procedure outlined
in Step 4.

ĂĂStep 6:ăNowrecalibrate the external trigger input. Before you start

the calibration, connect the external trigger input connector to the
trigger common reference connector on the rear panel. Use a
jumper cable with a banana plug connector on each end.

222PS Operator Manual

3Ć11

Calibration

NOTE

To calibrate the external trigger input, the TRIG COM
connector must be connected to the EXT TRIG INPUT
connector.

ĂĂStep 7:ăInvoke the menu again, and press the menu button next

to EXT TRIG. A new menu appears on the display, as shown in
Figure 3Ć5.

GND EXT TRIG:

CAL

3Ć12

Figure 3Ć5:ăThe Ground External Trigger Calibration Menu

In Detail

Calibration

ĂĂStep 8:ăPress the menu button next to CAL to begin the calibraĆ

tion. Follow the procedure outlined in Step 4.

ĂĂStep 9:ăWhen you are done, press the CLEAR button above the

menu buttons to return the instrument to normal operation.

222PS Operator Manual

3Ć13

Calibration

3Ć14

In Detail

Capturing Random

Events

Capturing random electric events in circuits is difficult and timeĆconĆ
suming. You can use the 222PS's single sequence mode to make the
task easier.

SingleĆsequence mode is one of four trigger modes you can use with
the 222PS. In singleĆsequence mode, the instrument acquires one
triggered signal. It then displays the signal and holds it until you press
the button labeled INIT to start the sequence all over again. Changing
a control that affects the signal acquisition also starts the sequence
again.

The following procedure will help you use singleĆsequence mode to
capture a random event.

ĂĂStep 1:ăPreset the instrument controls to display a baseline

signal.

ĂĂStep 2:ăApply a test signal to the channel 1 input to set the trigger

level. Make sure the test signal is the same amplitude and general
type (negative or positive pulse or sinusoidal) as the signal you
want to trigger on.

ĂĂStep 3:ăPress AUTO SETUP to obtain a quick frontĆpanel control

setup for the test signal. If the resulting vertical or horizontal
scaling result is not precisely what you want, adjust the voltsĆperĆ
division and secondsĆperĆdivision controls as you wish. If necesĆ
sary, reposition the trace vertically.

ĂĂStep 4:ăSet the trigger mode to normal.

ĂĂStep 5:ăSet the trigger source to channel 1.

ĂĂStep 6:ăAchieve a stable display by adjusting the trigger level

control.

ĂĂStep 7:ăTo set the trigger mode to singleĆsequence, Press the

button labeled MODE on the front panel. Press the menu button
next to the menu item SSEQ.

222PS Operator Manual

3Ć15

Capturing Random Events

ĂĂStep 8:ă Check that the sweep triggers each time the INIT button

is pressed. If it does not, readjust the trigger level control slightly
until the sweep triggers each time you press INIT. The TRIG'D
indicator lights when the instrument triggers.

ĂĂStep 9:ăDisconnect the test signal from the oscilloscope and

apply the random signal to the input.

ĂĂStep 10:ăPress INIT to arm the trigger system. The instrument

then waits for the trigger event. The TRIG'D indicator lights when
the instrument triggers.

ĂĂStep 11:ăAfter the instrument triggers and completes the single

sequence, press INIT again to acquire another signal.

In scroll mode, the singleĆsequence trigger mode is useful for capturĆ
ing an event that occurs either randomly or infrequently. If the event is
also very narrow, use the envelope mode as well.

Initialize the singleĆsequence function and let the oscilloscope watch
for the event. The 222PS acquires data continuously up to the trigger
point. When the trigger event occurs, the instrument acquires the data
it needs to fill the rest of the display. It then halts the acquisition and
displays the waveform (with the captured trigger event) until you press
the INIT button again.

3Ć16

In Detail

The 222PS has two fully isolated input channels with which you can
make floating measurements. With signals of up to 600 VAC
you can make measurements as you would with a volt meter.

This section explains how to select a channel, display the signal it
acquires, and choose the right channel coupling.

Selecting a Channel

You must select a channel before you can change its settings using
the frontĆpanel controls. You can select only one channel at a time. The
display indicates which channel is currently selected.

To select a channel, push the appropriate channel button (CH1 or
CH2) on the front panel.

Figure 3Ć6 shows the 222PS displaying signals for two channels.
Channel 1 is selected.

Channels

input,

RMS

-46.7mV+

Figure 3Ć6:ăChannel One Selected

222PS Operator Manual

5mV=.5V~

mS

2

3Ć17

Channels

Displaying a Channel

When a channel is on, the 222PS displays any signal it acquires
through that channel. When a channel is off, the 222PS does not
display its signal. If either channel is off, the screen displays OFF"
instead of its voltsĆperĆdivision value.

Even when a channel is off, the instrument can still use it as a trigger
source.

By default, the 222PS displays both channels. To turn a channel off,
follow these steps.

ĂĂStep 1:ăIf the channel is not already selected, select it by pushing

the appropriate channel button (CH1 or CH2) on the front panel.

ĂĂStep 2:ă Press the channel button again to display the channel

menu. The screen appears as shown below.

DCCH 2 CPLG:

3Ć18

AC

GND

CH 2 OFF

Figure 3Ć7:ăThe Channel Menu

ĂĂStep 3:ăPress the button next to the bottom menu item,

CH 2 OFF. This turns the selected channel off and clears the

menu from the display. However, until you select channel 1 for
another purpose, channel 2 is still the selected channel.

In Detail

To display a channel you have turned off, repeat the above procedure
until you see the menu on the screen. Then select the type of coupling
you wish to use for the channel signal. The following section describes
how to select the channel coupling.

When a channel is off, you can still change its vertical
settings with the POS, VOLTS/DIV,orVAR VOLTS/DIV
controls. First, select the channel. Then make the changes
you wish. The changes take effect when you turn the
channel back on.

Setting Channel Coupling

There are three possible couplings for each channel:

H DC coupling passes all frequencies of the input signal up to the

useful bandwidth of the instrument.

H AC coupling blocks any DC component of the signal and is the

most commonly used.

Channels

NOTE

H Ground coupling disconnects the input signal and grounds the

input for the selected channel.

To select the coupling for a channel, follow these steps.

ĂĂStep 1:ăIf the channel is not already selected, select it by pushing

the appropriate channel button (CH1 or CH2) on the front panel.

ĂĂStep 2:ăPress the channel button again to invoke the channel

menu. The screen appears as in Figure 3Ć7.

ĂĂStep 3:ăPress the button next to the menu item representing the

type of coupling you wish to use. For example, press the second
button from the top to select AC coupling.

If the type of coupling you wish already appears boxed, it is
already the selected coupling. Press the CLEAR button to remove
the menu from the display.

222PS Operator Manual

3Ć19

Channels

3Ć20

In Detail

The 222PS display shows you menus, signals, and readouts. This
section explains how you can control the information displayed to you.

Readouts

Readouts include volts per division for each signal, seconds per
division, and trigger level. The instrument also displays additional
information, depending on the characteristics of the signal you display
and the mode of the instrument.

Displaying and Clearing the Readouts

Unless you explicitly turn off the readouts, the 222PS displays them. If
you wish to turn the readouts off and view only the signals, follow
these steps.

The Display

ĂĂStep 1:ăPress the DISPL button on the top panel to access the

display menu. Figure 3Ć8 shows the display menu.

Figure 3Ć8:ăThe Display Menu

222PS Operator Manual

INV1DISPLAY:

INV2

XY

RO OFF

3Ć21

The Display

ĂĂStep 2:ăPress the menu button next to the bottom menu item RO

OFF. The menu disappears and the screen displays only the

signal.

ĂĂStep 3:ăIf you wish to turn the readouts back on again, repeat the

above procedure. The next time you access the display menu, the
RO OFF item appears boxed, indicating that it is selected and that
readouts have therefore been turned off. Press the button again to
deselect the menu item. The menu disappears and readouts
again appear.

Inverting the Display

You can invert the waveforms displayed for either channel. Figure 3Ć9
shows an example of a normal and an inverted waveform.

Normal

Waveform

Inverted

Waveform

3Ć22

Figure 3Ć9:ăNormal and Inverted Waveforms

Some signal processingcircuits,such as circuits thatprocesscomposĆ
ite video signals, automatically invert waveforms. While working on
these circuits you may want to invert these signals to view them
normally.

To invert a signal, follow these steps.

ĂĂStep 1:ăPress the DISPL button on the top panel to invoke the

display menu. See Figure 3Ć8.

In Detail

ĂĂStep 2:ăPress the button next to the menu item corresponding to

the channel you wish to invert (INV1 OR INV2).

After you press the menu button, the menu disappears and the
inverted signal (if any) reappears on the screen. A small downĆ
arrow appears in front of the volts per division readout for an
inverted channel.

ĂĂStep 3:ăIf you wish to display the channel normally, repeat the

above procedure. The next time you access the display menu, the
inverted channel item appears boxed, indicating that it is selected.
Press the button again to deselect the menu item. The menu
disappears, and the channel is no longer inverted.

Varying the Brightness

Use the intensity control on the back panel (labeled INTEN) to adjust
the display's brightness.

To changethe brightness, insert a small screwdriver into thecenter slot
of the knob and rotate the knob until the display appears as you wish.

The Display

222PS Operator Manual

3Ć23

The Display

3Ć24

In Detail

Horizontal Operation

This section discussescontrollingthe horizontal aspects ofyoursignal.
The knobs used to do this are at the bottom left of the front panel, as
shown in Figure 3Ć10.

Figure 3Ć10:ăThe Horizontal Controls

The horizontal controls affect signals acquired through both channels.

Horizontal Positioning

To position the signals horizontally, rotatethe inner knob, labeled POS.

You can position the trace to the right or the left up to oneĆhalf the
length of the screen. Readouts are not affected by horizontal positionĆ
ing.

For information on the positioning of XY traces, see page 3Ć81.

When X10 magnification is on, the horizontal position control scrolls
through the magnified waveform. For more information about magnifyĆ
ing waveforms, see page 3Ć29.

The horizontal position control affects the position of a saved waveĆ
form. The 222PS displays a saved waveform at the horizontal position
presently in effect, not the horizontal position at which it was saved.

222PS Operator Manual

3Ć25

Horizontal Operation

Seconds per Division

The 222PS can display a signal with a range of 20Ăs to 50Ăns. If magniĆ
fication is on, the instrument's range is 2Ăs to 5Ăns. This means that the
222PS can display a waveform that represents as long a period as
200Ăseconds or as short a period as 50Ăns (in the latter case, with
magnification on).

To change the secondsĆperĆdivision setting, turn the outer knob
(labeled SEC/DIV). The instrument displays the resulting seconds per
division at the bottom of the screen. The 222PS uses a 1-2-5 switchĆ
ing sequence: this means that each click of the knob changes the time
scale from, for example, 1Ăms to 2Ăms and then to 5Ăms, before going
to 10Ă ms.

If you are using battery power at slow time bases, turn off
the timeĆout feature described on page 3Ć37. Otherwise,
the instrument may time out and turn itself off before it can
completely acquire the signal.

NOTE

3Ć26

Aliasing

Aliased waveforms are waveforms that appear to have a frequency
much lower than is accurate.

Aliasing can occur when the seconds per division setting, and thereĆ
fore the sample rate, is too low to display a high frequency waveform
accurately. When this occurs, the instrument does not sample the
signal often enough. The resulting waveform it displays is misleading.
Figure 3Ć11 illustrates an aliased waveform.

A common symptom of aliasing is an unstable display even when the
TRIG'D light is on.

In Detail

Horizontal Operation

HighĆFrequency

Apparent LowĆFrequency

Waveform Due to Aliasing

Sampled Points

To avoid aliasing, make sure that your sample rate is fast enough for
the frequency of the signal you wish to view Ċ usually, at least twice
as fast as the highest frequency component of the signal.

Actual

Waveform

Figure 3Ć11:ăAn Aliased Waveform

TimeĆBase Mode

When you choose a seconds per division setting, the instrument
automatically selects the timeĆbase mode required to display the
resulting signal. The timeĆbase mode can also depend on the trigger
and acquisition modes. The 222PS uses four timeĆbase modes:
record, equivalentĆtime, scroll, and scrollĆscan.

Record Ċ For most seconds per division settings, the instrument

uses the timeĆbase mode you are most accustomed to: record. When
a trigger occurs, the 222PS acquires and displays a full screen of the
waveform in one pass.

EquivalentĆtime Ċ However, when the seconds per division setting

is too fast, the instrument cannot sample fast enough to capture all 512
samples and display them in one pass. Therefore, the instrument
depends on successive repetitions of the same waveform to fill the
display with samples.

Scroll and ScrollĆscan Ċ When the seconds per division setting is

very slow, the display takes too long to fill using record timeĆbase
mode. Therefore, the instrument uses one of scrolling timeĆbase
modes.

222PS Operator Manual

3Ć27

Horizontal Operation

The instrument uses scroll mode for slow time bases when either
autoĆlevel or autoĆbaseline trigger mode is in effect.

The instrument uses scrollĆscan mode for slow time bases when
normal or single sequence trigger mode is in effect.

Averaging and continuous envelope acquisitionmodesacquireseveral
records of data before displaying a waveform. Therefore, if either of
these acquisition modes is in effect, the instrument uses record
timeĆbase mode at slow time bases instead of a scrolling mode. Under
these circumstances, the display updates slowly.

Table 3Ć2 shows these dependencies and the actual secondsĆperĆdiviĆ
sion settings associated with each timeĆbase mode. The boundary
between the medium and the slow ranges differs according to whether
the instrument is in store or nonstore mode.

TableĂ3Ć2:ă TimeĆBase Modes

Store Mode

On or off

On
Off

On

Off

Seconds per
Division

Fast:
2Ăms to 50Ăns

Normal:
50Ăms to 5Ăms
20Ăms to 5Ăms

Slow:
20Ăs to 0.1Ăs

20Ăs to 50Ăms

Acquisition
Mode

Any EquivalentĆtime

Any Record

Normal or
Envelope

Averaging or
Continuous
Envelope

TimeĆbase
Mode

Scroll or
ScrollĆscan

RecordĊ
slow update

3Ć28

In Detail

Magnifying the Signal

You can magnify waveforms by ten times. To do so, push the inner
horizontal control knob, labeled POS.

When magnification is on, each division contains five data points
horizontally instead of the normal 50. The secondsĆperĆdivision readĆ
outs show corresponding values. Magnification also affects saved
waveforms on the display and their secondsĆperĆdivision readouts.

To view the rest of the magnified waveform, turn the horizontal position
knob. This action allows you to pan through the magnified waveform
from side to side.

When you pan through a magnified waveform, you may also be
moving the trigger position. The trigger position indicator, shown as a
+, cannot move off the screen. Therefore, if you pan the trigger
position off the screen to either side, the trigger position indicator
remains at the edge of the screen to show the direction of the trigger
point.

When magnification is on, a 10X indicator appears at the bottom of the
screen, to the right of the seconds per division readout. Figure 2Ć7
shows the bottom readouts.

Horizontal Operation

Displays in XY mode cannot be magnified.

When you magnify displays in scroll and scrollĆscan timeĆbase modes,
they update only after the instrument completely acquires the waveĆ
form.

To turn off magnification, push the horizontal POS knob again.

222PS Operator Manual

NOTE

3Ć29

Horizontal Operation

3Ć30

In Detail

Maintenance

The 222PS is covered by a standard Tektronix threeĆyear warranty. If it
fails during the warranty period, return it to Tektronix for free servicing
(subject to the conditions of the warranty statement).

To arrange for warranty service or get an estimate for outĆofĆwarranty
repairs, call 1Ć800ĆTEKĆWIDE (1Ć800Ć835Ć9433).

To help diagnose the problem, have the instrument serial number and
firmware version number available. The serial number is located at the
top right of the rear panel. To get the firmware identification number,
follow the steps below.

If your instrument must be returned for servicing, package it as deĆ
scribed on page 3Ć33.

Identifying the Firmware Version

To identify the 222PS firmware version, follow these steps.

ĂĂStep 1:ăPress the AUX FUNCT button on the top panel to access

the auxiliary functions menu. The display now appears as shown
in Figure 3Ć12.

222PS Operator Manual

3Ć31

Maintenance

ĂĂStep 2:ăPress the menu button next to ALIGN. This calls up the

ALIGNAUX:

SELF CAL

CONFIG

MOTOR TRIG

Figure 3Ć12:ăThe Auxiliary Functions Menu

XY Alignment Menu as shown in figure 3Ć13.

3Ć32

XYALIGN:

IDENT

Figure 3Ć13:ăXY Alignment Menu

ĂĂStep 3:ăPress the menu button next to IDENT. A message apĆ

pears in the middle of the display, identifying the instrument, as
shown in Figure 3Ć14. The version number you see may differ.

In Detail

TEKĆ222PS VER: x.xx

Figure 3Ć14:ăThe Firmware Version

Repackaging for Shipment

Remember to put the instrument in its carry case before repacking. If
the original packing materials are unfit or unavailable, then repackage
the instrument in the following manner:

Maintenance

1. Use a corrugated cardboard shipping carton with a test strength
of at least 125 kg (275 lb) and an interior size at least 15 cm (6 in)
greater than the instrument size in all dimensions. See AppenĆ
dix D: Specifications for instrument dimensions.

2. Enclose the following information:

H the owner's name and address

H the name and phone number of a contact person

H the serial number of the instrument

H the reason for returning the instrument

H a complete description of the service required

3. Disconnect the battery before packing the instrument.

4. Completely wrap the instrument with polyethylene sheeting or its
equivalent to protect the outside finish and keep harmful subĆ
stances out of the instrument.

222PS Operator Manual

3Ć33

Maintenance

5. Cushion the instrument on all sides with three inches of padding

6. Seal the shipping carton with an industrial stapler or strapping

7. Call 1Ć800ĆTEKĆWIDE (1Ć800Ć835Ć9433) for shipping instructions.

material or urethane foam, tightly packed between the carton and
the instrument.

tape.

3Ć34

In Detail

You can operate the 222PS by using the internal battery or by plugĆ
ging it into external power. This section explains how to do both. It also
explains how to charge and change the battery when necessary.

Battery Operation

The 222PS comes supplied with a battery for use when portable
operation is convenient.

Completely recharge the battery as soon as possible after each use of
the instrument under battery power.

The instrument is shipped from the factory with the battery
charged. However, the battery may not retain its charge
while in transit to you. Therefore, we recommend that you
charge the battery for three hours before operating the
222PS for the first time.

Power

NOTE

Even when the instrument is off, current trickles slowly
from the battery. If the current drawn off in this way deĆ
pletes the battery below 7.32ĂV, the instrument cannot start
on battery power. If this condition occurs, recharge the
battery immediately. Instructions for charging the battery
are on pageĂ3Ć37.

Connecting the Battery

The battery is charged at the factory. It is shipped disconnected to
prolong its shelf life. To connect the battery, follow these steps.

ĂĂStep 1:ăPlace the oscilloscope on its left side as viewed from the

front panel.

222PS Operator Manual

NOTE

3Ć35

Power

ĂĂStep 2:ăOpen the probe pouch and disconnect the probes.

ĂĂStep 3:ăSlide the battery compartment cover and probe pouch

toward the rear of the instrument to unlock the locking tabs.

ĂĂStep 4:ăLift the battery compartment cover and remove it. The

instrument now appears as shown in Figure 3Ć15.

Figure 3Ć15:ăSide View Without Battery Cover

ĂĂStep 5:ăConnect the threeĆwire battery connector to the pins at

the rear of the instrument. The orientation of the connector does
not matter.

3Ć36

ĂĂStep 6:ăReplace the battery compartment cover. Position the

cover locking tabs into the matching slots in the battery compartĆ
ment. Make sure the locking tabs are all the way in the slots on
both the top and the bottom. If the tabs do not seat easily, first
seat the top tabs and then press on the bottom of the cover to
seat the bottom tabs.

ĂĂStep 7:ăPush forward on the rear of the battery compartment

cover to lock the tabs.

ĂĂStep 8:ăAs soon as possible, charge the battery for three hours.

See the following instructions for charging the battery.

In Detail

Power

Charging the Battery

During periods of heavy use in a harsh environment, you will need to
recharge the battery after three hours of operation. Under better
circumstances, it may need recharging less often. The battery will last
longer if you recharge the instrument after each use.

When the battery charge is low, a lowĆbattery indicator
the upper right corner of the display. If the battery voltage drops below

7.32ĂV, the instrument automatically turns itself off.

In order to recharge the battery, plug in the External Power AC Adapter
and leave the instrument turned off for three hours.

appears in

NOTE

The 222PS battery recharges whenever you plug it into
external power. However, it recharges faster if the instruĆ
ment is off.

Charging the Battery Externally

You can charge the battery outside the instrument using the external
battery charger accessory. See the OptionalAccessories information in
Appendix E. You can also use any other charger that supplies 9.8ĂVDC
at 20

_C with the supply current limited to 1ĂA. For best results in

various temperatures, thermally compensate the charging voltage by

-10 mV per degree C.

For example, at 50

9.80 V + [(50 - 20)

To charge the battery, follow the steps on the data sheet that comes
with the battery charger unit.

_C, the charging voltage is

 -10 mV] = 9.50 V

Time Out

An automatic timeĆout feature prevents the battery from losing power
when the instrument is unattended for a long period. When you enable
the timeĆout feature, the 222PS turns itself off after two minutes of
operating under battery power with no changes to the controls.

222PS Operator Manual

3Ć37

Power

You can disable the timeĆout feature so that the instrument stays on for
the life of the battery's charger. You can also enable the timeĆout
feature again when you wish. To do so, follow these steps.

ĂĂStep 1:ăPress the AUX FUNCT button on the top panel to display

the auxiliary functions menu. Figure 3Ć16 shows the display.

ALIGNAUX:

SELF CAL

CONFIG

MOTOR TRIG

Figure 3Ć16:ăThe Auxiliary Functions Menu

3Ć38

ĂĂStep 2:ăPress the menu button next to CONFIG to access the

configuration menu. Figure 3Ć17 shows the configuration menu.

TIME OUTCONFIG:

BAUD

MODEM ON

PROBE

Figure 3Ć17:ăThe Configuration Menu

In Detail

Power

ĂĂStep 3:ăThe TIME OUT menu item appears boxed when the

timeĆout feature is enabled. To disable the timeĆout feature press
the top menu button.

This menu item is a toggle. Repeating this procedure reĆenables
the timeĆout feature and boxes the menu item again.

ĂĂStep 4:ăTo clear the menu from the display, press the button

labeled CLEAR.

Replacing the Battery

If you use the instrument on battery power often, you may wish to
obtain and charge extra batteries to take with you. Then, when the
battery charge inside the instrument gets low, you can switch to one of
the fully charged spare batteries.

NOTE

Because the 222PS loses saved data after 30 s without
power, have the spare battery handy before beginning this
procedure.

To replace the battery, follow these steps:

ĂĂStep 1:ăOpen the battery compartment. Follow the procedure on

pageĂ3Ć35.

ĂĂStep 2:ăDisconnect the battery from the threeĆwire battery conĆ

nector.

ĂĂStep 3:ăLift the battery pack out of the battery compartment.

ĂĂStep 4:ăPlace the charged replacement battery into the battery

compartment with the battery leads on the bottom facing toward
the threeĆwire battery connector.

ĂĂStep 5:ăConnect the battery to the threeĆwire battery connector.

ĂĂStep 6:ăClose the battery compartment. Follow the procedure on

pageĂ3Ć35.

ĂĂStep 7:ăRecharge the low battery as soon as possible. See the

procedure on page 3Ć37.

222PS Operator Manual

3Ć39

Power

Storing the Instrument

When storing the instrument for a period shorter than two months,
leave the battery connected. When the instrument is off, the current
drawn from the battery is less than 1ĂmA. With the battery in place,
waveform settings and front panel setups remain in memory; they are
available when you turn the oscilloscope on again.

When storing the instrument for a period longer than two months,
follow these steps to extend the life of your battery and instrument.

ĂĂStep 1:ăCharge the battery fully. Follow the instructions on

pageĂ3Ć37.

ĂĂStep 2:ăRemove the battery from the instrument. Use the proceĆ

dure on pageĂ3Ć35 to remove the battery cover.

ĂĂStep 3:ăStore the fully charged battery in a cool place.

Deep Discharge

Under certain circumstances, the battery can become deeply disĆ
charged. When in this state, the battery accepts a charge very slowly.
In some cases, it may not accept a charge at all.

3Ć40

A deep discharge condition is caused by three situations:

H using the instrument until the battery charge is low and then

storing it without recharging it

H storing the battery in a discharged state

H storing the instrument for over two months without removing the

battery

If the battery becomes deeply discharged, you may be able to recover
it with the following procedure.

ĂĂStep 1:ăCharge the battery for 24Ăhours. Follow the instructions

on pageĂ3Ć37.

ĂĂStep 2:ăIf the battery does not accept the charge, remove it from

the instrument and try again to charge it using a 20ĂV power
supply that is currentĆlimited to 100ĂmA.

In Detail

ĂĂStep 3:ăDuring this operation, check the power supply frequently

for a currentĆlimited state. If the battery recovers from its state of
deep discharge, it will cause the power supply to currentĆlimit. Do
not leave the battery connected to the external power supply
without checking it frequently.

ĂĂStep 4:ăIf the power supply shows that it is currentĆlimited,

reinstall the battery in the instrument.

ĂĂStep 5:ăContinue to recharge the battery.

ĂĂStep 6:ăIf the battery does not recover, return it to Tektronix for

safe disposal or dispose it in accordance with local environmental
regulations.

External Power Operation

The 222PS has an external power input connector so that it need not
use the battery power. You can connect the 222PS to a wall socket
using the External Power AC Adapter or you can use your own exterĆ
nal power source.

Power

You can also operate the instrument on external power without the
battery present. For instructions on removing the battery, see
pageĂ3Ć39.

AC Line Operation

The 222PS comes with an External Power AC Adapter. This adapter
converts AC line voltage to the 16-20ĂVAC input voltage that the
instrument requires. The adapter also recharges the 222PS's battery.

In order to maintain the battery charge for times when you
require portable operation, we recommend that you use
the External Power AC Adapter whenever practical.

In order to operate the instrument from line power, follow these steps.

ĂĂStep 1:ăPlug the jack end of the External Power AC Adapter into

the external power input on the rear panel of the instrument.

222PS Operator Manual

NOTE

3Ć41

Power

ĂĂStep 2:ăPlug the prong end of the External Power AC Adapter into

an AC power source.

ĂĂStep 3:ăPress the ON button.

When the oscilloscope is operating under external power, an
external power indicator

the display.

appears in the upper right corner of

Other Sources of External Power

You can operate the 222PS from your own external power source. The
power source must supply at least 15ĂW or 16ĂvoltĆamperes.

H An AC power source must provide 16-20ĂVAC at 47-400 ĂHz.

H A DC power source must provide 12-28ĂVDC.

The external power input connector has two contacts. DC power of
either polarity can be between contacts.

NOTE

To prevent blowing internal fuses, do not force either pin
lower than .5 volts more negative than the instrument
chassis. The instrument chassis is connected to the
ground pin of the RSĆ232 communications port and to the
external trigger connector common.

3Ć42

WARNING

To avoid possible injury or damage to the 222PS or
equipment connected to it, do not float the external trigger
common connector, the RSĆ232 communications port, or
the external power input above 42ĂV peak. These inputs
are not electrically isolated from each other.

In Detail

Probes

The 222PS comes with two P850 10X probes. An additional 1X probe,
the P400 probe, is available as an optional accessory.

The P850 probes provide high attenuation so that you can scale
signals approaching 600 VAC
useful for measuring sensitive highĆimpedance electronic circuits or
highĆvoltage divider circuits. The optional P400 probes measure
lowĆlevel signals requiring high sensitivity.

To prevent improper operation and the risk of electric
shock, use only Tektronix P400 or P850 probes with this
instrument.

Actual probe attenuation factors are 3X for the P400 probe
and 30X for the P850 probe. The instrument is calibrated to
compensate for these attenuation factors. Other probes or
input devices will therefore give incorrect amplitude
displays.

for better display. They are also

RMS

CAUTION

The optional P400 1X probe limits the maximum deflection factor of the
222PS to 50Ăvolts per division. It decreases the probe tip input impedĆ
ance to 1ĂMW and is sufficient for minimal loading of sensitive circuits.
The P400 probe also limits input frequency to 20 MHz.

To avoid personal injury or damage to the 222PS or the
probes, do not apply more than 850ĂV peak between
probe tip and earth ground, between probe tip and probe
common, or between probe common and earth ground.

222PS Operator Manual

WARNING

3Ć43

Probes

Connecting the Probes

The input connectors for the probes are inside the pouch over the
battery compartment, on the right side of the oscilloscope as you face
the screen. You must unzip or remove the pouch to access the conĆ
nectors.

Figure 3Ć18:ăSide View Showing Probe Connectors

(Pouch Removed)

Probe Connectors

3Ć44

To connect a probe, place its jack end into a channelĂinput connector.
Press until you feel the probe is firmly seated.

You do not need to disconnect the probes before storing them in the
pouch.

CAUTION

The exposed probe tips are sharp for probing through
solderĆresin and oxide layers. When placing the probes in
the side pouch, store them with the retractable hook tip
attached to prevent unnecessary damage to the pouch.

In Detail

Configuring the Probes

To ensure that the 222PS is operating with the correct settings, confiĆ
gure the instrument to match the probes you are using.

To set the probe configuration, follow these steps.

ĂĂStep 1:ăPress the AUX FUNCT button on the top panel to display

the auxiliary functions menu, as shown in Figure 3Ć19.

Probes

ALIGNAUX:

SELF CAL

CONFIG

MOTOR TRIG

Figure 3Ć19:ăThe Auxiliary Functions Menu

ĂĂStep 2:ăPress the menu button next to the CONFIG menu item to

access the configuration menu. The display now appears as
shown in Figure 3Ć20.

222PS Operator Manual

3Ć45

Probes

TIME OUTCONFIG:

BAUD

MODEM ON

PROBE

Figure 3Ć20:ăThe Configuration Menu

ĂĂStep 3:ăPress the menu button next to the PROBE menu item to

access the probe menu, as shown in Figure 3Ć21.

3Ć46

CH 1 1XPROBE:

CH 1 10X

CH 2 1X

CH 2 10X

Figure 3Ć21:ăThe Probe Menu

In Detail

Probes

ĂĂStep 4:ăBoxes appear around the items that represent the current

probe configuration. The default configuration for the 222PS
assumes 10X probes on both channels. Therefore, those menu
items appear boxed unless you have already changed the probe
configuration.

Press the menu button or buttons next to the menu items correĆ
sponding to the configuration you need. If the current probe
settings are appropriate, you need not press any buttons.

ĂĂStep 5:ăAfter you have configured the 222PS for the correct

probes, press the CLEAR button to remove the menu from the
display.

NOTE

The probe configurations are in the 222PS memory. They
remain there until you change them again or until the
memory loses power. If the probe configuration is lost, it
returns to the default value of 10X probes for both chanĆ
nels.

Probe Accessories

The P850 probes come with four accessories (shown in Figure 3Ć22):

H a retractable hook tip

H an IC lead protection shroud

H a detachable probe common lead

H two cableĆmarker rings

When removing the hookĆtip assembly from the probe, you
can accidentally disconnect the probe body from the
probe cable. If this occurs, no signal can pass from the
probe to the oscilloscope. To reconnect the probe body to
the cable, insert the connector at the end of the cable into
the probe body until it seats firmly.

222PS Operator Manual

NOTE

3Ć47

Probes

1

2

3Ć48

Probe

34

Figure 3Ć22:ăProbe and Accessories

In Detail

Probes

1. You can use the detachable probe common lead shown in FigĆ
ure 3Ć22 to connect the oscilloscope input common to the referĆ
ence point of the circuit being tested. The probe common lead is
not chassis ground and you can connect it to an active circuit
component. You can therefore make a floating measurement
across a component, with neither point connected to ground
potential.

WARNING

To avoid personal injury or damage to the 222PS or the
probes, do not apply more than 850 V peak between
probe tip and earth ground, between probe tip and probe
common, or between probe common and earth ground.

2. You can snap the colored cable marker rings shown in FigĆ
ure 3Ć22 into the grooves on the probe cable to distinguish
between the probes connected to channel 1 and channel 2.

3. When testing integrated circuit devices, remove the hook tip and
use the IC lead protection shroud on the probe tip. The shroud
shown in Figure 3Ć22 exposes the sharp probe tip, but it prevents
the probe from creating a short circuit across adjacent IC leads.

4. The hook tip shown in Figure 3Ć22 can connect to accessible test
points such as a component lead or test point connector. This
accessory frees your hands for other tasks.

222PS Operator Manual

3Ć49

Probes

3Ć50

In Detail

Saving and

Recalling Data

The 222PS has memory to store saved waveforms and frontĆpanel
setups. Data in this memory remains as long as the instrument has
access to one of these power sources:

H a battery with a charge greater than 7.32ĂV (see page 3Ć35 for a

discussion of battery operation)

H line voltage coming through a power cord plugged into a wall

socket through the external AC adapter (see page 3Ć41 for a
discussion of line operation)

H power coming in from another external power source (see

pageĂ3Ć42 for a description of acceptable external power sources)

The instrument does not need to be on for it to access power for the
memory. However, if you turn off the instrument, disconnect it from any
external power source, and remove its battery, it will lose any data in
memory after 30 s.

Waveforms

A saved waveform is a record of a single acquisition cycle. Think of it
as a snapshot of a waveform. The 222PS lets you save up to four
waveforms in memory. It can recall these at any time.

Saving a Waveform

Use these steps to save a waveform.

ĂĂStep 1:ăSelect the channel whose waveform you wish to save or,

if you wish, put the instrument in XY mode.

ĂĂStep 2:ăUsing the selected channel, acquire and display the

waveform you wish to save.

ĂĂStep 3:ăPosition the waveform where you wish it to be saved.

222PS Operator Manual

3Ć51

Saving and Recalling Data

ĂĂStep 4:ăPress the SAVE button on the top panel. Acquisition

stops, the screen freezes, and a menu appears as shown in
Figure 3Ć23.

Figure 3Ć23:ăSaved Waveforms Menu

If the waveform you are saving uses channel 1, the menu name is
SAVE CH1 WV:. If the waveform you are saving uses channel 2,
the menu name is SAVE CH2 WV:. If the waveform you are saving
uses XY mode, the menu name is SAVE XY WV:.

1SAVE CH1 WV:

2

3

4

3Ć52

The example in Figure 3Ć23 assumes a waveform acquired using
channel 1.

ĂĂStep 5:ăPress the button next to the memory location in which

you wish to save the waveform.

NOTE

You can save only one waveform to each memory location;
the 222PS can store only four waveforms. If you choose a
memory location that already holds a waveform, the
instrument replaces it with the one you are presently
saving.

The 222PS displays readouts of the parameters of the saved
waveform at the bottom of the screen, as shown in Figure 3Ć24.

In Detail

Saving and Recalling Data

In Figure 3Ć24, the waveform has been saved to memory locaĆ
tion 1 and therefore named W1. Its vertical setting is 10 mV per
division, its coupling is DC (as indicated by the =), and its horiĆ
zontal setting is 10 ms per division.

1SAVE CH1 WV:

2

3

W1 10 mV = 10 ms

4

Figure 3Ć24:ăSaved Waveform Parameters

A waveform saved in XY mode shows the scale factor for the x
axis (channel 1)in the position of thevolts per division setting. The
scale factor for the y axis (channel 2) appears in the position of the
seconds per division setting.

ĂĂStep 6:ăTo clear the menu, press the button labeled CLEAR or

invoke another menu. Changing one of the following frontĆpanel
controls also clears the menu: volts per division, seconds per
division, X10 magnification, or autolevel.

ĂĂStep 7:ăAfter clearing the menu, the 222PS continues to display

the saved trace and its readout. To clear them, press the button
labeled CLEAR again.

Recalling a Saved Waveform

To display a saved waveform, follow these steps.

ĂĂStep 1:ăPress the RCL button on the top panel. A menu appears

as shown in Figure 3Ć25.

222PS Operator Manual

3Ć53

Saving and Recalling Data

Figure 3Ć25:ăThe Recall Waveforms Menu

ĂĂStep 2:ăPress the button next to the memory location that holds

the waveform you wish to view. The menu disappears and the
222PS displays the waveform at the same position in which it was
saved, with the same parameters in effect. The instrument also
displays readouts of these parameters at the bottom of the
screen.

1RECALL WVFRM:

2

3

4

3Ć54

If the instrument displays two saved waveforms, the last one you
recall is the one whose parameters appear on the screen.

If the 222PS is already displaying a saved waveform, the memory
location that holds it appears boxed in the menu. If you press a
button next to a memory location holding an already displayed
waveform, the waveform disappears from the screen.

If you press a button corresponding to an empty memory locaĆ
tion, the instrument beeps and the menu remains displayed.

ĂĂStep 3:ăTo clear the menu press the CLEAR button or invoke

another menu.

ĂĂStep 4:ăAfter you clear the menu, the instrument continues to

display the recalled waveform. To clear the recalled waveform,
press the CLEAR button again. This action clears all recalled
waveforms.

ĂĂStep 5:ăTo erase a waveform from a memory location, save

another waveform to the same location.

In Detail