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TM-09556A-12
MODEL 2246 MOD A
NSN 6625-01-275-4766
T A M C N A 7 0 6 1
T.O. 33A1-13-584-1
TEK OPERATORS
MANUAL
070-7061-00
Product Goup 46
22461 Y,
2246 2R,
and
2246 Mod A
PORTABLE
OSCILLOSCOPES
OPERATORS
SN B100100
AND ABOVE
Please Check for
CHANGE INFORMATION
at the Rear of This Manual
THIS MATERIEL MAY BE REPRODUCED BY OR FOR THE U.S. GOVERNMENT
PURSUANT TO THE COPYRIGHT LICENSE UNDER THE (DFAR) CLAUSE AT
S2.227-7013 (15 MAY 1987).
DISTRIBUTION STATEMENT - Distribution authorized to U.S. Government agencies
only for administrative or operational use, (effective date is date of this manual). Other
requests for this document must be referred to San Antonio ALC/MMEDT, Kelly AFB TX
78241-5000.
HANDLING AND DESTRUCTION NOTICE - Comply with distribution statement and
destroy by any method that will prevent disclosure of contents or reconstruction of the
document.
First Printing JUN 1988
Revised JUN 1989
Copyright 01988 Tektronix, Inc. All rights reserved. Contents of this publi-
cation may not be reproduced in any form without the written permission of
Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and
foreign patents and/or pending patents,
TEKTRONIX, TEK, SCOPE-MOBILE and are registered trademarks
@
of Tektronix, Inc.
Printed in U.S.A. Specification and price change privileges are reserved.
INSTRUMENT SERIAL NUMBERS
Each instrument has a serial number on a panel insert, tag, or stamped on
the chassis. The first number or letter designates the country of manufac-
ture. The last five digits of the serial number are assigned sequentially and
are unique to each Instrument. Those manufactured in the United States
have six unique digits, The country of manufacture Is Identified as follows:
B000000 Tektronix, Inc., Beaverton, Oregon, U.S.A.
G100000 Tektronix Guernsey, Ltd., Channel Islands
E200000 Tektronix United Kingdom, Ltd., Marlow
J300000 Sony/Tektronix, Japan
H700000 Tektronix Holland, NV, Heerenveen, The Netherlands
HK00000 Hong Kong
Repackaging for Shipment
Save the original shipping carton and packing material in case it is ever
necessary to reship the instrument by a commercial transport carrier. If
the original materials are unfit or not available, then repackage the instru-
ment using the following procedure.
1. Use a corrugated cardboard shipping carton with a test strength of at
least 275 pounds and an inside dimension at least six inches greater
than the instrument dimensions.
2. Enclose the following information: owner's address, name and phone
number of a contact person, type and serial number of the instrument,
reason for returning, and a complete description of the service
required.
3. Completely wrap the instrument with polyethylene sheeting or
equivalent to protect the outside finish and keep harmful substances
out of the instrument.
4. Cushion instrument on all sides with three inches of padding material or
urethane foam, tightly packed between the carton and the instrument.
5. Seal the shipping carton with an Industrial stapler or strapping tape.
6. If the instrument was NOT purchased under Air Force Contract No.
F41 608-88-D-0087, address the shipping carton to the nearest
Tektronix Service Center. Please include your own return address on
the shipping carton.
If purchased under Air Force Contract No. F41608-88-D-0087, this
instrument is warranted for 5 years in accordance with the terms of
said contract.
NOTE
Special Instructions for instruments purchased under Air Force
Contract No. F41 608-88-D-0087:
If the instrument IS still under warranty, contact your local Tektronix
Service Center for shipping instructions.
If the Instrument IS NOT under warranty, address the shipping
carton to the nearest Tektronix Service Center. Please Include your
own return address on the shipping carton.
Certificate of the Manufacturer/Importer
We hereby certify that the 2246 1Y AND 2246 MOD A
OSCILLOSCOPES 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
marketed.
The German Postal Service has the right to re-test the series and to
verify that it complies.
TEKTRONIX
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.
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.
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
LIST OF TAB LEA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
OPERATORS SAFETY SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . ix
SECTION 1-INTRODUCTION
PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
PREPARATION FOR USE. . . . . . . . . . . . . . . . . . . . . . . . 1-4
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Line Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Line Voltage and Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Instrument Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Repackaging for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
SECTION 2-CONTROLS, CONNECTORS, AND INDICATORS
CRT, Power and Display.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Vertical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Horizontal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
A Trigger Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
B Trigger Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Menu System Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
SECTION 3-OPERATORS FAMILIARIZATION
BASIC OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Readout Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Graticule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
2246 1Y and 2246 Mod A Operators i
Connecting Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Probes . . . . . . . . . . . . . . . ........... . ............. . 3-4
Coaxial Cables . . . . . . . . . . . . . . . . . . . . 3-4
External Triggering . . . . . . . . . . . . . . . . . . . . . 3-4
MENU SYSTEM OPERATION.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Introduction . . . . . . . . . . . . . . . . . . . . . . . 3-5
Clearing the Menu and Cursors Display . . . . . . . 3-5
Setting Measurement Channel . . . . . . . . . . . . 3-6
Recalling the Last Measurement Mode . . . . . . . . . 3-8
Channel land Channel 2 Voltmeter . . . . . . . . 3-8
Voltmeter Measurements Page 1 . . . . . . . . . . . . . . . . . . . . . . . 3-10
Voltmeter Measurements Page 2, GATED Measurements 3-10
Cursors Measurements . . . . . . . . . . . . . . . . 3-11
Time Menus . . . . . . . . . . . . . . . . 3-13
Conditions for Cursors Display . . . . . . . 3-16
Measurement Cursors . . . . . . . 3-16
Track Trig Lvl Cursors.. . . . . . . . . . . . . 3-16
Track A Cursors. . . . . . . . . . 3-17
Behavior for Horizontal Mode Changes . . . . . . . . . . . . 3-17
Measurement Compatibility and Error Messages . . . . . . . . . . . . 3-18
Measurements in Single Sequence Mode . . . . . . . . . . . . . 3-19
Service Menu Features . . . . . . . . . . . . . . . . 3-20
Configure Menu. . . . . . . . . . . . . . 3-21
Self Cal Measurements . . . . . . . . . . . . . . . . . . . . 3-23
Internal Settings Menu . . . . . . . . . . . . . . 3-23
SECTION 4-OPERATOR CHECKS AND ADJUSTMENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Trace Rotation Adjustment. . . . . . . . . . . . . . . 4-2
Probe Low-Frequency Compensation . . . . . . . . . . 4-3
Vertical Deflection Check.. . . . . . . . . . 4-4
Timing Checks . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
ii 2246 1Y and 2246 Mod A Operators
SECTION 5-BASIC APPLICATIONS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
CH 1/CH 2 Voltmeter Measurements . . . . . . . . . . . . . . . . . . . . . . . 5-1
Peak Voltage Measurement.. . . . . . . . . . . . . 5-2
Gated Voltage Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Voltage Measurement Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Voltage Difference . . . . . . . . . . . . . . . . . . . 5-6
Ground-Referenced Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Time Measurement Cursors. . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Time Difference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Period Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Frequency Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Rise-Time Measurements . . . . . . . . . . . . . . 5-12
Phase Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Time Delay Measurement.. . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
Track Trigger Level Cursors . . . . . . . . . . . . . . . 5-19
Setting Trigger Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
Use of the Add Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
SECTION 6-PERFORMANCE CHARACTERISTICS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Recommended Calibration Schedule . . . . . . . . . . . . . . . . . . . . . . . . 6-1
SECTION 7-PERFORMANCE CHECK PROCEDURE
Introduction . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Test Equipment Required.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Performance Check Interval. . . . . . . . . . . . . . . . . . . . 7-1
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Index to Performance Check Procedure . . . . . . . . . . . . . . 7-6
DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Trace Rotation . . . . . . . . . . . . . . . . . . . . . . . 7-8
Geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
VERTICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
input COUPLING Functional Check . . . . . . . . . . . . . . 7-10
CH 1 and CH 2 VOLTS/DIV Trace Shift . .. . . . . . . . 7-11
CH 3 and CH 4 VOLTS/DIV Trace Shift . . . . . . . . . . . . . . . .
.. 7-12
CH 1 and CH 2 VAR VOLTS/DIV Trace Shift. . . . . . . . . . . . . .
. 7-12
CH 1 and CH 2 Input Coupling Trace Shift . . . . . . . . . . . 7-13
CH 2 INVERT Trace Shift . . . . . . . . . . . . . . . . . . 7-13
2246 1Y and 2246 Mod A Operators iii
CH 1 and CH 2 VAR VOLTS/DIV Range . . . . . . . . . . . . 7-13
Low Frequency Linearity Check. . . . . . . . . . . . . . . 7-14
CH 1 and CH 2 Vertical Deflection Accuracy. . . . . 7-15
CH 3 and CH 4 Vertical Deflection Accuracy . . . . . . . . 7-16
ADD Mode and CH 2 INVERT Deflection Accuracy . . . . . . . 7-16
Vertical POSITION Range (all channels) . . . . . . . . . . 7-17
CH 1 to CH 2 Signal Delay Match . . . . . . . . . . . . . 7-19
CH 1 to CH 4 Signal Delay Match . . . . . . . . . . . . . . . . . . . . . . 7-19
CH 3 to CH 4 Signal Delay Match . . . . . . . . . . . . 7-20
Ch 1 and CH 2 Vertical Bandwidth . . . . . . . . . . . . . . . . . . . . 7-20
CH 3 and CH 4 Vertical Bandwidth . . . . . . . . . 7-21
Ch 1 and CH 2 Aberrations . . . . . . . . . . . . . . . . . . . . . . . . . . 7-22
SCOPE BW (Bandwidth Limit) Accuracy . . . . . . . . . 7-22
Common-mode Rejection Ratio . . . . . . . . . . . . . 7-23
Channel Isolation . . . . . . . . . . . . . . . . . . . 7-24
AC-Coupled Lower -3 dB Point . . . . . . . . . . . . . . . . . . . . . . . . 7-25
Vertical ALT and CHOP Modes . . . . . . . . . . . . . . . . . . . . . . . . . 7-26
BEAM FIND Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . 7-26
A and B Trace Separation, . . . . . . . . . . . . . . . . . . . . . . . . 7-27
TRIGGERING . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-28
500 Hz Trigger Sensitivity., . . . . . . . . . . . . . . . . . . . . . . . . 7-28
500 kHz Trigger Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29
25 MHz Trigger Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30
100 MHz Trigger Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-31
100 MHz NOISE REJ Trigger Sensitivity . . . . . . . . . . . . 7-32
Single Sweep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-32
Trigger LEVEL Control Range . . . . . . . . . . . . . . . . . . . . . . . . 7-33
TV Field Trigger Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-34
TV Line Trigger Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-34
Line Trigger Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . . 7-35
HORIZONTAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-36
A and B Sweep Length . . . . . . . . . . . . . . . . . . . . . . . . . . 7-36
Horizontal POSITION Range . . . . . . . . . . . . . . . . . . . . . . . . 7-37
VAR SEC/DIV Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37
Magnifier Registration.... . . . . . . . . . . . . . . . . . . . . . . . . . . 7-38
A and B Timing Accuracy and Linearity . . . . . . . . . . . . . . . . . 7-38
A and B Magnified Timing Accuracy and Linearity . . . . . . . 7-40
Delay Time Jitter...... . . . . . . . . . . . . . . . . . . . . . . . . 7-41
Delay Time Accuracy... . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-41
Delay Time Position Range . . . . . . . . . . . . . . . . . . . . . . . . . 7-42
X-Axis Gain Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43
X-Y Phase Difference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43
X-Axis Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-44
iv 2246 1Y and 2246 Mod A Operators
TIME AND CURSORS MEASUREMENTS . . . . . . . . . . . . . . 7-45
l+ SEC+land ltl/SEC ~ Cursor Accuracy . . . . . . . . . 7-45
Delta Time Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . 7-46
ltPHASE +1 Cursor Accuracy . . . . . . . . . . . . . . . . . . . . . 7-47
l+ VOLTS ~ Cursor Accuracy . . . . . . . . . . . . . . . . . . . . . 7-47
hvoLTs+curSOrAccuracy . . . . . . . . . . . . . . . 7-48
Tracking Cursors Position Accuracy . . . . . . . . . . . . . . . . . 7-48
CH 1/CH 2 VOLTMETER MEASUREMENTS . . . 7-50
DC Volts Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-50
DC Volts Normal Mode Rejection Ratio . . . . . 7-51
+Peak, -Peak, Peak-to-Peak Voltage Accuracy . . . . . . . . . . . 7-52
25 MHz +Peak, -Peak, and Peak-to-Peak Volts Accuracy . . 7-53
100 MHz +Peak, -Peak, and Peak-to-Peak Volts Accuracy . 7-53
Gated Volts Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . 7-54
EXTERNAL Z-AXIS, PROBE ADJUST AND FACTORY
SETTINGS Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-55
Check External Z-Axis Input . . . . . . . . . . . . . . . . . . . . . . . 7-55
PROBE ADJUST Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56
Run MAKE FACTORY SETTINGS Routine . . . . . . . . . . . . . . . . 7-56
SECTI0N 8-OPTIONS AND ACCESSORIES
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Option 2R (Rackmount) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Options A1-A5 Internatlonal Power Cords . . . . . . . . . . . . . . . . 8-1
Standard Accessories.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Instrument Enhancements. . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Transportation Adds . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Cameras, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Viewing Hoods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
APPENDIX A - FACTORY SETTINGS
APPENDIX B - 067-0557-00 CALIBRATION FIXTURE
2246 1Y and 2246 Mod A Operators REV JUN 1989 v
LIST OF ILLUSTRATIONS
Figure Page
1-1 The 2246A Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-2 Optional power cords . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
2-1 CRT, power, and display controls . . . . . . . . . . . . . . . . . . . 2-2
2-2 CH 1 and CH 2 vertical controls and connectors . . . . . . . . . . . . . 2-4
2-3 Vertical connectors and CH 3 and CH 4 controls . . . . . 2-6
2-4 Horizontal controls and indicators . . . . . . . . . . . . . . . . . . . 2-8
2-5 Trigger controls and indicators . . . . . . . . . . . . . . . . . . . . . 2-12
2-6 Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
2-7 Menu controls . . . . . . . . . . . . . . . . . . . . . . . . 2-20
3-1 Readout display locations . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-2 Graticule measurement markings . . . . . . . . . . . . . . . . . . . 3-3
3-3 Voltmeter measurement channel menu . . . . . . . . . 3-6
3-4 Delay-Time/Delta-Time channel menu . . . . . . . . . . . . . . 3-7
3-5 Voltmeter and Gated Measmt menus . . . . . . . . . . . . . . . 3-9
3-6 Cursor Volts measurements menus . . . . . . . . . . . . . . . . . 3-12
3-7 Time measurement menu . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3-8 Service menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
3-9 Configure menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
3-10 Internal settings menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
4-1 Probe compensation. . . . . . . . . . . . . . . . . . . . . . . . 4-4
5-1 +PEAK voltage measurement and tracking cursors . 5-4
5-2 Gated voltage measurement . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5-3 Voltage difference measurement using cursors . . . . . . . . . . . 5-7
5-4 Voltage measurement . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5-5 Period measurement . . . . . . . . . . . . . . . . . . . . . . . 5-11
5-6 Frequency measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
5-7 Rise time measurement . . . . . . . . . . . . . . . . . . . . . . . 5-13
5-8 Making a phase difference measurement . . . . . . . . . . . . 5-16
5-9 Time difference between the two delays . . . . . . . . 5-19
5-10 A and B Track Trig Lvl cursors . . . . . . . . . . . . . . . . . . . . . 5-20
5-11 Setting a specific trigger level . . . . . . . . . . . . . . . . . . . . . . 5-23
vi 2246 1Y and 2246 Mod A Operators
5-12 Eliminating common-mode signals . . . . . . . . . . . 5-26
6-1 Maximum input voltage vs frequency derating curve for
the CH 1, CH 2, CH 3, and CH 4 input connectors 6-15
6-2 Dimensional drawing, standard cabinet . . . . . . . . . . . 6-22
6-3 Dimensional drawing, rackmount cabinet (2240 F1R) 6-23
2246 1Y and 2246 Mod A Operators vii
LIST OF TABLES
Table Page
2-1 VERT Trigger SOURCE . . . . . . . . . . . . 2-16
3-1 Behavior for Horizontal MODE Changes . . . . . . . . . 3-18
5-1 T r i g g e r C u r s o r C h a n n e l . . . . . . . . . . . . .. 5-22
6-1 Electrical Characteristics.. . . . . . . . . . . . . . . . . 6-2
6-2 Environmental Characteristics . . . . . . . . . . . . 6-16
6-3 Mechanical Characteristics. . . . . . . . . . . . . 6-19
7-1 Test Equipment Required . . . . . . . . . . . . . . . 7-3
7-2 Signal-to-Graticule Accuracy . . . . . . . . . . . . 7-15
7-3 Settings for Timing Accuracy Checks . . . . . . 7-38
7-4 D e l a y T i m e A c c u r a c y . . . . . . . . . . . . . . . .. . . 7-42
A-1 Factory S e t t i n g s . . . . . . . . . . . . . . . . . . .. A-1
viii 2246 1Y and 2246 Mod A Operators
OPERATORS SAFETY SUMMARY
The safety information in this summary is for operating personnel.
Warnings and cautions will also be found throughout the manual where
they apply.
Terms in this Manual
CAUTION statements identify conditions or practices that could result in
damage to the equipment or other property.
WARNING statements identify conditions or practices that could result in
personal injury or loss of life.
Terms as Marked on Equipment
CAUTION indicates a personal injury hazard not immediately accessible as
one reads the markings, or a hazard to property, including the equipment
itself.
DANGER indicates a personal injury hazard immediately accessible as one
reads the marking.
Symbols in this Manual
This symbol indicates where applicable
cautionary or other information is to
A be found. For maximum input voltage
see Table 6-1.
Symbols as Marked on Equipment
DANGER--High voltage.
%
o.
&_.
-- Protective ground (earth) terminal.
A ATTENTION--Refer to manual.
2246 1Y and 2246 Mod A Operators ix
Power Source
This product is intended to operate from a power source that does not ap-
ply more than 250 V rms between the supply conductors or between either
supply conductor and ground. A protective ground connection, by way of
the grounding conductor in the power cord, is essential for safe operation.
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 connection, by way of the grounding con-
ductor 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.
The power cord must be 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 as 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.
x 2246 1Y and 2246 Mod A Operators
Do Not Remove Covers or Panels
(Excluding Front Panel Cover)
To avoid personal injury, do not remove the product covers or panels. Do
not operate the product without the covers and panels properly installed.
2246 1Y and 2246 Mod A Operators REV JUN 1989 xi
SECTION 1
INTRODUCTION
2246 1Y and 2246 Mod A
Introduction
PRODUCT OVERVIEW
Description
The 2246 1Y and 2246 Mod A are 100 MHz, four-channel, dual-sweep,
portable oscilloscopes for general-purpose use (Figure 1-1). A
microprocessor-based operating system controls most of the functions in
the instruments, including a fully Integrated menu-driven voltage and time
measurement system with SmartCursors@. A menu-driven service mode
provides for configuring of certain menu and readout displays, internal
calibration, and servicing diagnostics.
Figure 1-1. The 2246 1Y and 2246 Mod A Oscilloscope.
2246 1Y and 2246 Mod A Operators 1-1
Introduction
The vertical deflection system has four input channels. Two channels have
11 basic deflection factors from 2 mV to 5 V per division, and two channels
have two basic deflection factors of 0.1 V and 0.5 V per division. Basic
deflection factors can be extended with attenuator probes. VOLTS/DIV
readouts are switched to display the correct vertical scale factors when
properly coded probes are connected to the vertical input connectors.
The horizontal deflection system provides single, dual, or delayed sweeps
from 0.5 s to 20 ns per division (delayed sweep, 5 ms to 20 ns per division).
The trigger system provides stable triggering over the full bandwidth of the
vertical deflection system.
Alphanumeric crt readouts of the vertical and horizontal scale factors are
displayed at the bottom of the screen. On-screen vertical and horizontal
cursors provide accurate voltage, time, frequency, and phase measure-
ments; measurement values are displayed at the top of the crt.
The measurement features include voltage measurements for +Peak,
-Peak, Peak-to-Peak, and average DC, or positionable cursors for
measuring voltage difference, time difference, frequency, and phase.
SmartCursors@ that visually track voltage measurements, trigger levels,
and ground can be placed on displayed waveforms. Delay-time and delta-
delay measurements for time, frequency, and phase are available in ALT
and B Horizontal Modes.
1-2 2246 1Y and 2246 Mod A Operators
Introduction
Standard Accessories
The following Items are standard accessories shipped with the 2246 1Y and
2246 Mod A instrument:
2 Probes, 10X, 2 meter, with accessories
1 Probe, 1X, 2 meter, with accessories
1 Power cord
1 Power cord clamp
1 CRT implosion shield, blue plastic (installed)
1 Fuse, 2A, 250 V, slow-blow
1 Attaching accessory pouch
1 Accessory pouch, ziploc
1 Front Cover
The following Items are standard accessories shipped with the 2246 1Y
instrument:
2 Operators manuals
2 Service manuals
2 Reference guides
The following Items are standard accessories shipped with the 2246 Mod A
instrument:
1 Operators manual
1 Reference guide
See Section 8, "Options and Accessories" for part numbers and further
information about standard accessories and a list of the recommended
optional accessories. For more information on accessories and ordering
assistance, contact your Tektronix representative or local Tektronix Field
Office.
2246 1Y and 2246 Mod A Operators REV JUN 1989 1-3
Introduction
PREPARATION FOR USE
Safety
Refer to the Operators Safety Summary at the front of this manual for
power source, grounding, and other safety information about the use of the
instrument. Before connecting the 2246 1Y and 2246 Mod A to a power
source, read this section and the Safety Summary.
Line Fuse
This instrument can be damaged if the wrong line fuse is
installed.
Verify the proper value of the power-input fuse with the following
procedure,
1. Press in the fuse-holder cap and release it with a slight counter-
clockwise rotation,
2. Pull the cap (with the attached fuse inside) out of the fuse holder.
3. Verify proper fuse value.
4. Install the proper fuse and reinstall the fuse-holder cap.
Line Voltage and Power Cord
The 2246 1Y and 2246 Mod A operates on line voltages from 90 to 250 V
with line frequencies ranging from 48 to 440 Hz. No line voltage selecting is
necessary. Instruments are shipped with the power cord that was
requested on the order. The power cord must match the power-source
outlet; if it does not, contact your Tektronix representative or local
Tektronix Field Office. See Figure 1-2 for optional power cords available.
For electrical-shock protection, insert this plug into a power-
source outlet that has a properly grounded protective-ground
contact.
1-4 2246 1Y and 2246 Mod A Operators
Introduction
Figure 1-2. Optional power cords.
2246 1Y and 2246 Mod A Operators 1-5
Introduction
The detachable three-wire power cord has a three-contact plug for con-
nection to the power source and the protective ground. The power cord is
held to the rear panel by a clamp. The protective ground contact on the
plug connects (through the power cord protective-ground conductor) to
the accessible metal parts of the instrument.
Instrument Cooling
To prevent instrument damage from overheated components, make sure
the internal airflow is not blocked. Before turning on the power, check that
the ventilation holes on the bottom and side of the cabinet are not covered.
Start-up
At power on, the instrument does a self-diagnostic check. If the instrument
does not turn on and operate normally, turn power off then on again. If the
instrument still does not turn on properly, refer the instrument to a qualified
service person. TRIGGER MODE LEDs may be flashing to indicate the cir-
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