Tektronix 2247A User manual

TEK OPERATORS
·MANUAL 070-6373-01
Product Group 46
First Printing JAN 1989
2247A·
PORTABLE
OSCILLOSCOPE
OPERATORS
Please Check for
CHANGE INFORMATION
at the Rear of This Manual
COMMITTED TO EXCELLENCE

Copyright © 1988, 1989 Tektronix, Inc. All rights reserved. Contents of this
publlcatlon may not be reproduced in any form without the written permis-
sion of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered by U.S . and
foreign patents Issued and pending.
~
TEKTRONIX, TEK, SCOPE-MOBILE and ~ are regist~~ed 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 two digits designate the country of manufacture. The
last five digits of the serial number are unique to each Instrument . The
country of manufacture Is Identified as follows:
B000000 T ektronlx, Inc. , Beaverton, Oregon, U.S.A.
E200000 Tektronix United Kingdom, Ltd., London
G100000 Tektronix Guernsey, Ltd., Channel Islands
HK00000 Tektronix, Inc., Hong Kong
H700000 Tektronix Holland, NV, Heerenveen, The Netherlands
J300000
Sony/Tektronix, Japan
-
l_
I •
Certificate of the Manufacturer/Importer
We hereby certify that the ___ 2_2_4_7_A_O....;;,S_;C_IL_L_O;;;_S;;;_C~O_P...::;E;__ __
AND ALL INSTALLED OPTIONS
complies with the RF Interference Suppression requirements of
Amtsbl.-Vfg 1046/ 1984.
The German Postal Service was notified that the equipment Is being
marketed. -
The German Postal Service has the right to re-test the series and to
verify that It compiles.
TEKTRONIX
Bescheinigung des Herstellers/lmporteurs
Hlermlt wlrd beschelnlgt, da(3 der/dle/das 2247A OSCILLOSCOPE
AND ALL INSTALL!ED OPTIONS
In Uberelnstlmmung mlt den Bestlmmungen der A~tsblatt-VerfugLlng
1046/ 1984 funkentstort 1st.
Der Deutschen Bundespost wurde das lnverkehrbrlngen dleses Gerates
angezelgt und die Berechtlgung zur 'uberprufung der Serie auf Elnhalten
der Bestlmmungen elngeraumt.
TEKTRONIX

·. ,o
NOTICE to the user/operator:
The German Postal Service requires that Systems assembled by the
operator/user of this Instrument must also comply with Post~I
Requlatlon, Vfg. 1046/1984, Par. 2, Sect. 1.
HINWEIS fur den Benutzer/Betreiber:
Die vom Betrelber zusammengestelite Anlage, lnnerhalb darer dies
Ger at elngesetzt wlrd, mu'3 ebenfalls den Voraussetzungen nach Par. 2,
Ziff. 1 der Vfg. 1046/1984 genugen.
NOTICE to the user/operator:
The German Postal Service requires that this equipment, when used in a
test setup, may only be operated If the requirements of,Postal
Regulation, Vfg. 1046/1984, Par. 2, Sect. 1.7.1 are complied with.
HINWEIS fur den Benutzer/Betreiber:
Deles Ger at darf In Me(3aufbauten nur betrieben werden, wenn die
Voraussetzungen des Par. 2, Ziff. 1. &.1 der Vfg. 1046/1984
eingehalten werden.
C
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS ..................................... viii
LIST OF TABLES .............................................. ix
OPERATORS SAFETY SUMMARY .............................. x
SECTION 1-INTRODUCTION
PRODUCT OVERVIEW 1 I I e O I I I o I I o o o I O I I O O I .~ O I I I I I I I O I I I I 1 1 I 1 1
Description
••••••IO I I I I I I I I I I I I I I I I IO o I I I I I Io I e Io I I I I I I I I I I O I
1-1
1-1
1-3
Standard Accessories
o I I IO I IO O I I I I I I I I IO I I 1 10 Io I I I Io 1 1 O 1 1 1 o I Io I
PREPARATION F<?R USE ....... , ............................... 1-4
Safety ................... _. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Line Fuse, ...... : .............. ·. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Line Volta,ge and Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
lnstrumerit Cooling .......................... ' .................. 1-6
Start-Up .................................. : . . . . . . . . . . . . . . . . . 1-6
Repackaging for Shipment ................................... ,. . 1-7
~ J
SECTION 2-CONTROLS, CONNECTORS, AND INDICATORS
CRT, Power and Display ....................... : .... ; . . . . . . . . . . 2-1
Vertical
..................................................... 2-3
Horizontal · · · · · · · · · · · · · · · · · · · · · • • · · · · · · ·
..................... 2-8
Trigger ...................................... ' .............. .
2-12
A Trigger Modes ......................... , ................ 2-15
B Trigger Modes O I I I I I I I I I I I
IO I I I IO O I I I I I I I IO I I I I I I I Io O I Io
Rear Panel ................................................. .
Menu System Controls ...................................... .
2247A Operators
2-16
2-20
2-21

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Page
SECTION 3-OPERATORS FAMILIARIZATION
INTRODUCTION . .- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
BASIC OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Graticule ............................................ : . . . . . . . 3-1
Readout Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Connecting Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Grounding ...................................... . ........... 3-4
Probes .................................................... 3-4
Coaxial Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
External Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Auto Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Min Setup .................................................. ·. 3-5
MENU SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Clearing the Menu and Cursors Display .......................... 3-7
Setting Measurement Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Recalling the Last Measurement Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Channel 1 and Channel 2 Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Voltmeter Measurements Page 1 ............................ 3-12
Voltmeter Measurements Page 2, GATED Measurements ....... 3-12
Cursor Volts Measurements ........................ ! . . . . . . . . . . 3-13
Time Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Counter/Timer .................................. : . . . . . . . . . . . 3-25
CIT Measurement Menu Page 1 ............................. 3-25
Gated C/T Measurement Menu Page 2 ....................... 3-27
CIT Control Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
Conditions for Cursors Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Measurement Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Track Trig Lvl Cursors ..................................... 3-31
Track rf, Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
Behavior for Horlzontal Mode Changes . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Measurement Compatibility and Error Messages . . . . . . . . . . . . . . . . . 3-33
Measurements In Single Sequence Mode . . . . . . . . . . . . . . . . . . . . . . . . 3-34
ii
2247A Operators
fl
II
u
/I
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Page
SECTION 3-OPERATORS FAMILIARIZATION (cont)
Service Menu Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35
Configure Menu ........................ .'. . . . . . . . . . . . . . . . . . 3-35
Self Cal Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39
Internal Settings Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39
Store/Recall Setup Features .................................. 3-40
Factory Stored Setups ..................................... 3-42
Recall 011!y Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42
Store/Recall Setup Menu ............... ·: ................... 3-45
Recovering A Deleted Setup ............. , . . . . . . . . . . . . . . . . . . 3-49
Storing Setups~ Sequences ................................ 3-50
SECTION 4-OP.ERATOR CHEOKS AND ADJUSTMENTS
Introduction .............. : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Initial Setup .... · ........ ,. ..... ·. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Auto Se(up Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Trace Rotation Adjustment .................. '. . . . . . . . . . . . . . . . . . . 4-3
Probe Low-Frequency Compensation ................ ~ . . . . . . . . . . . 4-3
Vertical Deflection Check ...................................
1• • •
4-5
- J
Timing Checks ........................... ' .........
1• • • . . . • • . •
4-6
SECTION 5-BASIC APPLICATIONS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
CH 1 ICH 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
2247A Operators
iii

Page
SECTION 5-BASIC APPLICATIONS (cont)
Time Measurement Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 1O
Time Difference ..................................... : . . . . . 5- 1O
Propagation Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 11
Rise Time Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 11
Phase Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 11
Frequency and Period Measurements . . . . . . . . . . . . . . . . . . . . . . . . 5- 14
Time Delay Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 14
Track Trigger Level Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 17
Setting Trigger Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 21
Use of the Add Mode ........................................ . 5- 22
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
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
IV
2247A Operators
I
II
SECTION 7-PERFORMANCE CHECK PROCEDURE (cont)
VERTICAL (cont)
Page
CH 1 and CH 2 VAR VOL TS/DIV Range · · · · · · · · · · ·
........... 7-13
Low Frequency Linearity Check
CH 1 and CH 2 Vertical Deflectlo~· ~~~-u~~~~-:::::::::::::::::: ;=::
CH 3 and CH 4 Vertical Deflection Accuracy .................. 7-16
ADD Mode and CH 2 INVERT Deflection Accuracy 7-17
Vertical ROSITION Range (all channels) ........ : : : : : : : : : : : : : 7_18
CH 1 to CH 2 Signal Delay Match
· · · · · · · · .,. · · · · · · · · ..... .. ... 7-19
CH 1 to CH 4 Signal Delay Match
CH 3 to CH 4 Signal Delay Match
. · · · · · · · · •' ·•· · · · · · · · • · · ...... 7-20
Ch 1 ~nd CH 2 Vertical Bandwldt~ ........................... 7-21
· · · · · · · •, · · · · · · · · · •· · ...... 7-21
CH 3 and CH 1 Vertical BandwJdth . . . . . . . . . . . . . . . . . . . . . . . 7_
22
SCOPE BW (Bandwidth Limit) Accuracy .................. : : : : 7-23
Common-mode Rejection Ratio
.. · · · · · · · · · · · · · · · · · · •· · ...... 7-23
Channel Isolation •
AC-C6upled Lowe~.~~ ·d·~ -~~I~~ ......................... · · · · · 7-24
· · · · · · · · · · , ,. · · • · · · ........... 7-25 -
Vertical ALT and CHOP Modes
BEAM FIND Functional Check .............................. 7-26
..... · · · · · · · · ' 7-26
A and B Trace Separation · · · · · · · · · · · · · · · · '° ·
TRIGGERING ............... , ............ · · · )· · · 7 -27
......... · · · · · · · · · · · · · · · · · · · · · • 7-28
500 Hz Trigger Sensitivity ................ ,· · · · ·,· · · · · · · · · · · · ·
5
oo kHz Trigger Sensitivity ............... : : : : · · · · · · · · · · · · · · · 7-28
25 MHz
Trigger Sensitivity · · · · • · · · · · · · · · · 7-3o
1
SO MHz Trigger Sensitivity
......... · · · · · · · · · · · · · · · · · • · · ..... 7-30
Single Sweep Mode
....... · · · · · · · · · · · · · · · · · • · · ...... 7-31
• • • • • • • • • • • • • • • • • I
Trigger LEVEL Control Range · · · · · · · · · · · · · · · · · · · · · · ·
• e I IO I I I I I IO I l l I IO I I I I I I I I IO I I I I
TV Field Trigger Sensitivity I
If I I I I I I I I I IO I I I I I I I Io I I I I I I IO I I
TV Line Trigger Sensitivity
Line Trigger Functional Che·c·k· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
I I I I I I I I I I I I I I IO IO I I I I I I I I I I I I I
2247A Operators
7-33
7-34
7-34
7-35
7-35
V
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I
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I

Page
SECTION 7-PERFORMANCE CHECK PROCEDURE (cont)
HORIZONTAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37
A and B Sweep Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37
Horlzontal POSITION Range .......................... : . . . . . . 7-38
VAR SEC/DIV Range .............................. ........ 7-38
Magnifier Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-39
A and B Timing Accuracy and Linearity . . . . . . . . . . . . . . . . . . . . . . . 7-39
A and B Magnified Timing Accuracy and Linearity . . . . . . . . . . . . . . 7-40
Delay Time Jitter .......................................... 7-42
Delay Time Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43
Delay Time Position Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-44
X-Axls Gain Accuracy .................................... .- 7-45
X-Y Phase Dttference ...................................... 7-45
X-Axls Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-46
MEASUREMENT CURSORS ................................... 7-47
I+- SEC -+I and I+- 1 /SEC -+I Cursor Accuracy ............. . .. .. 7-47
I+- PHASE -+I Cursor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-48
I+- VOL TS -+I Cursor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-49
rh VOLTS-+! Cursor Accuracy .............................. 7-49
Tracking Cursors Position Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . 7 -49
CH 1 /CH 2 VOLTMETER ......................... .' ........... 7-51
DC Volts Accuracy ........................................ 7-51
DC Volts Normal Mode Rejection Ratio ....................... 7-52
+Peak, -Peak, Peak-to-Peak Volts Accuracy ..... . .......... . 7-53
25 MHz +Peak, -Peak, and Peak-to-Peak Volts Accuracy ....... 7-54
100 MHz +Peak, -Peak, and Peak-to-Peak Volts Accuracy ... ... 7-54
Gated Volts Accuracy ..................................... 7-55
COUNTER/TIMER ......................... . ..... . .......... . 7-56
Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56
Width .................................................... 7-57
Rise Time Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-59
vi 2247A
Operators
Page
SECTION 7-PERFORMANCE CHECK PROCEDURE (cont)
EXTERNAL 2-AXIS AND PROBE ADJUST AND FRONT -PANEL SETUP
FUNCTIONS .............................. ' .................. 7-61
Check External 2-Axls Input ................................ 7-61
PROBE ADJUST Output .................................... 7-62
AUTO SETUP Functlonal Check ............................. 7-62
Run MAKE FACTORY SETTINGS Routine ..................... 7-63
OPTION 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-64
Signal Output . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . 7-64
A GATE Output ....................... .': .................. 7-65
SECTION 8-OPTIONS AND ACCESSORIES
Introduction .... , .............. r • • . . • • • • • • • • • • • • • • • • • • • • • • • • • . • 8-1
International Power Cords .... : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Option 15 ..... : .............................................. 8-1
Option 1A Rackmounted Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Other Available Options .................... , ................... 8-2 -
Standard Accessories ......................................... 8-3
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
I
APPENDIX A - AUTO SETUP and MIN SETUP CONTROL SETTINGS
APPENDIX B - FACTORY SETTINGS
APPENDIX C - FACTORY STORED SETUPS
2247A Operators vii

LIST OF ILLUSTRATIONS
Figure
1-1 The 2247A Oscilloscope
Page
1- 1
1-2
2-1
Optional power cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 5
CRT, power, and display controls . . . . . . . . . . . . . . . . . . . . . . . . 2- 2
2-2 CH 1 and CH 2 vertical controls and Indicators .......... . . . 2- 4
2-3
2-4
2-5
2-6
2-7
3-1
3-2
3-3
3-4
4-1
5-1
5-2
Vertlcal connectors and CH 3 and CH 4 controls ...... .. .. . 2- 7
Horizontal controls and Indicators .. .. ..... . .... . . . ... . .. . . 2- 9
Trigger controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 14
Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 20
Menu controls ................................ . .. ... . . .2- 22
Graticule measurement markings . . . . . . . . . . . . . . . . . . . . . . . . . 3- 2
Readout display locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 3
Menu buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 6
Typical Store/Recall Setup sequencing ................... 3- 41
Probe compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4- 5
+PEAK voltage measurement and tracking cursors . . . . . . . . . . 5- 4
Gated voltage measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 6
5-3 Voltage difference measurement using cursors .. ,· .......... 5- 7
5-4 Voltage measurement .............................. . . .. 5- 9
5-5 Making a phase difference measurement . . . . . . . . . . . . . . . . . 5- 13
5-6 Time difference between the two delays . . . . . . . . . . . . . . . . . . 5- 17
5-7 A and B Track Trig L vi cursors . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 18
5-8 Setting a specific trigger level ...... . ......... . ....... ... 5- 21
5-9 Eliminating common-mode signals . . . . . . . . . . . . . . . . . . . . . . . 5- 24
6-1 Maximum Input voltage vs frequency derating curve for
the CH 1, CH 2, CH 3, and CH 4 Input connectors . . . . . . . . 6- 27
6-2 Dimensional drawing, standard cabinet . . . . . . . . . . . . . . . . . . . 6- 33
6-3 Dimensional drawing, rackmount cabinet (2240F 1R) .... . .. 6-34
viii 2247A
Operators
I I
L
Table
2-1
3-1
5-1
LIST OF TABLES
VERT Trigger SOURCE
Page
2-18
Behavior for Horizontal MODE Changes . . . . . . . . . . . . . . . . . . . 3-32
Trigger Cursor Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
6-1 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6-2 Envlronmental Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28
6-3 Mechanical Characteristics .......... : .............. . .... 6-30
7-1 Test Equipment Required ... .. ... ... . : . .. ... . .. .. . ... . .. . 7-3
7-2 Signal-to-Graticule Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
7-3 Settings for Timing Accuracy Checks . : . . . . . . . . . . . . . . . . . . 7-41
7-4 Delay Tim'e Accuracy .. .. : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-44
A-1 AUTO SETUP Controi Settings . , .... . ... .. . .. .. . ...... . . . A-1
A-2 MIN SETUP contro• Settings
8020100 and above . .................... . . . .. . .. . ....... A-5 _
,
B-1
Factory Settings
8-1
-J
2247A Operators
ix

OPERA TORS SAFETY SUMMARY
The safety Information in this summary is for operating personnel. Warn-
ings 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
be found. For maximum Input voltage
see Table 6-1.
Symbols as Marked on Equipment
DANGER-High voltage.
Protective ground (earth) terminal.
ATTENTION-Refer to manual.
X 2247A
Operators
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 es~ential 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, lnqludlng 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.
2247A Operators
xi

Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product covers or panels. Do
not operate the product without the covers and panels properly installed.
xii
2247A Operators
SECTION 1
INTRODUCTION
- J
2247A Operators

. ,0
Introduction
PRODUCT OVERVIEW
Description
The 2247A Is a 100 MHz, four-channel, dual-sw,eep, portable oscilloscope
for general-purpose use (Figure 1-1). A microprocessor-based operating
system controls most of the functions In the Instrument, including a fully
integrated menu-driven voltage and time measurement system with
Smart Cursors®. A counter /timer (CIT) is Integrated into the trigger sys-
tem to provide many automated counting and timing measurements with
high accuracy. Other features Include single-button automatic front-panel
setup and a menu-driven store/recall setup function. A menu-driven
service moae provides for configuring of ~ertain menu and readout
displays, internal calibration, and servicing diagnostics.
6373-01
Figure 1-1. The 2247A Oscllloscope.
2247A 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 O. 1 V and O. 5 V per division. Basic
deflection factors can be extended with attenuator probes. VOL TS/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.
Measurement features Include voltage, time , frequency, and phase ,
counter/timer measurements, and risetime/falltime or propagation delay.
Voltage measurements Include positive peak, negative peak, peak- to -
peak, and average de levels, measured over the entire display or a selected
portion ( gated measurements) .
Counter /timer measurements Include frequency, period, width, totalize,
frequency ratio, gated frequency, gated period, gated width, gated events ,
delta time, one-over-delta time, phase, rise/fall time, and propagation
delay, using an Internal or external frequency standard. Counter /timer
measurements can be averaged to increase the number of displayed digits,
and measurement trigger points can be Indicated with cllrsors on screen.
Positionable cursors allow absolute voltage, voltage difference, time dif -
ference, frequency, and phase measurements. SmartCursors® visually
track voltage measurements, trigger levels and ground and may be
selectively displayed with the waveforms. Time, frequency, and phase
measurements referenced to the trigger event or between two user -
selected events are available In ALT and B horizontal modes.
By pressing a single button (AUTO SETUP), the front-panel controls can
be set up to produce a usable waveform display based on the voltage and
time characteristics of the Input signals.
The Store/Recall system lets you store and recall up to 20 different front -
panel setups. Stored setups can be arranged In sequences as required for
specific applications.
1-2 2247A
Operators
Introduction
Standard Accessories
The following Items are standard accessories shipped with the 2247A
instrument:
2 Probes, 1 OX, 1.5 meter, with accessories
1 Power cord
Power cord clamp
Operators manual
Ref ere nee guide
1 CRT filter, blue plastic (installed)
1 Fuse, 2A, 250 V, slow-blow
1 Accessory pouch, ziploc
See Section 8 "Options and Accessories" for P.art 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.
2247A Operators
1-3

·. .o
Introduction
PREPARATION FOR USE
Safety
Refer to the Operators Safety Summary at the front of thi~. manual for
power source, grounding, and other safety Information about th ·e use of the
Instrument. Before connecting the 2247A 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 2247A operates on line voltages from 90 to 250 V with line frequencies
ranging from 48 to 440 Hz. No line voltage selecting Is necessary. Instru -
ments 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, con-
tact your Tektronix representative or local Tektronix Field Office. See
Figure 1-2 for optional power cords available.
1-4 2247A
Operators
r
I
I
I
I
I
Plug
Configuration
Option
U.S.
Std.
A1
A2
A3
A4
AS
Power Cord/
Plug Type
U.S.
120V
EURO
220V
UKa
240V
Australian
240V
North
American
240V
Switzerland
220V
Line
Voltage
120V
220V
240V
240V
240V
,
2'20V
Introduction
Reference
Standards b
ANSI C73.11
NEMA 5-15-P
IEC 83
UL 198.6
CEE(7),
11, IV, VII
IEC 83
IEC 127
BS 1363
IEC 83
IEC 127
AS C112
IEC 127
ANSI C73.20
NEMA 6-15-P
IEC 83
UL 198.6
SEV
tSC
127
a A 6A , type c fuse is also installed inside the plug of the '?ption '.'2 power cord.
b Refer ence Standards Abbreviations:
ANSI-American National Standards l~stitute
AS-Standards Association of Australia
BS-British Standards Institution
1
CEE-lnternational Commission on Rules for the Approval of
Electrical Equipment ,
IEC-lnternatlonal Electrotechnical Commission .
NEMA-Natlonal Electrical Manufacturer ' s Ass~lat1on
SEV-Schweizervischer Elektrotechnischer Vere1n
UL-Underwriters Laboratories Inc.
Figure 1-2. Optional power cords.
2247A O perators
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.
WARNING I
For electrical-shock protection, insert this plug into a power -
source outlet that has a properly grounded protective-ground
contact.
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 Instrum ent
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 ipdicate the cir
cult location of a start-up error; you should report this information to the
service person.
When the Instrument Is turned on, a self-cal routine may run to set th
voltage- and timing-measurement constants . The power-on self cal run
only if the stored constants have been lost, possibly due to a dead memory
back-up battery. The following warning message will be displayed for 5
seconds: "WARNING PROBABLE BATTERY FAILURE TURN OFF AND ON
TO VERIFY". If the message reappears after having turned the power off
and on, have the battery checked and/or replaced by a qualified service
person. The Instrument can still be used for accurate measurements by
running the SELF CAL MEASUREMENTS routine from the SERVICE MENU
after the Instrument has warmed up for at least 20 minutes.
To run the SELF CAL MEASUREMENTS routine, press the top and bottom
menu-Item select buttons. Press down-arrow button to underline SELF
1-6 2247A
Operat ors
II
II
I I
I I
Introduction
CAL MEASUREMENTS. Press RUN to start the routine, then QUIT or
CLEAR DISPLAY to return to the normal oscilloscope mode.
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 27S pounds and an inside dimension at least six inches greater
than the instrument dimensions.
2. If Instrument Is being shipped to a Tektronix: Service Center, 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 equiva-
lent to protect the outside fintsh and keep harmful substances out of
the Instrument.
4.
5.
6.
,
Cushion Instrument on all sides with three inches of padding material or
urethane foam, tightly packed between the carton and the instrument.
Seal the shipping carton with an industrial s~apler or strappin-gJ tape.
I
Mark the address of the Tektronix Service Center ~nd your own return
address on the shipping carton.
2247A Operators
1-7

SECTION 2
CONTROLS,
CONNECTORS,
AND INDICATORS
2247A Operators

I I
1 11
11
11
Controls, Connectors, and Indicators
CRT, Power, and Display
Refer to Figure 2-1 for location of items 1 through 9.
0
0
®
0
®
®
0
®
POWER Switch- Turns on or off instrument power. Press for ON or
OFF. '
At least one VERTICAL MODE button will light when the power is
turned on. The front-panel setup existing when the power is turned off
will return when the power is turned on again.
A INTEN Control-Adjusts the brightness of the A trace .
B INTEN Control-Adjusts the brightness of the B Delayed sweep
trace and the intensified zone on the A trace.
FOCUS Control-Adjust~ the focus of the crt displays (traces,
readout, and cursors) . .
TRACE ROTATION Control-Aligns the crt trace with the horizontal _
graticule lines. This is a screwdriver adjustment.
READOUT Control-Adjusts the brightness of the crt reado_fJt display
(Includes all alphanumerics and cursors). '
SCALE ILLUM Control-Adjusts the illumination level of the
graticule.
NOTE
Life of the graticule illumination lamps can be increased by
setting the SCALE ILLUM control for the · minimum intensity
needed for viewing , and turning off scale illumination when
not needed .
BEAM FIND Button-Locates off-screen and overscanned displays
when the button is held in. Limits the vertical and horizontal deflection
within the display area and unblanks the CRT.
2247A Operators
2-1

4
Controls, Connectors, and . Indicators
r
,::::
®
/
\.
~
ON
~
\
"Tektronix \ 2247A
\
/ \
-,
~
..,
•
I
•··· .... ....
.... ....
I
t-
...
•
I-
-
T .
,[ii, ...
.....
·-··
.. ..
....
·'
POWER
A INTEN
B INTEN
...
~
OFF
100 MHz OSCILLOSCOPE
COUNTERfTIMER
.... .... .... .... ....
-
~
I•• ; • • •• .. ..
.... ....
FOCUS
READOUT
T .E
ROT1 IO N
----
I
'I
~
~
SCALE l
ILLUM
BEA M FINO
0--cD
PROBE
ADJUST
Figure 2-1. CRT, power, and display controls.
CRT -Displays waveforms and readouts In an 80 mm v ertlc 1
100 mm horizontal graticule area.
y
Internal graticule lines provide parallax-free viewing of t rac
graticule lines. 0%, 10%, 90% and 100% points marked at th
edge of the graticule aid in making rise- and fall-time measur em nt .
2-2
2247A Op rc1cor
I .
Controls, Connectors, and Indicators
Vertical
Refer to Figure 2-2 for location of items 10 through 17.
@ CH 1 and CH 2 POSITION Controls-Ad}ust vertical position of the
Channel 1 and Channel 2 waveform displays.
@
MODE Buttons-Select the vertical channels for display (CH 1, ADD
channels 1 and 2, CH 2, CH 3, and CH 4). The CHOP/ ALT MODE
button selects method for switching input channels on the display
( chopped or alternating) .
Except for CHOP/ ALT modes, pressing an._unlit mode button turns on
the mode, and pressing a lit button turns off the mode . CHOP is
selected when the CHOP/ ALT button is lit; ALT Is selected when the
button Is not lit.
CH 1, CH 2, CH 3, and CH 4-Select vertical channels for display.
At least one , of the channels or ADD is always on and cannot be turned
off until another channel Is first turned on.
CH . OP/ ALT-In the CHOP mode the displa,y chops between selected -
Input channels at a rate of about 625 kHz. In the ALT mode , the
selected channels are displayed in sequence (altern~ting at the end of
each sweep) .
ADD-Displays the algebraic sum of the Channel 1 and Channel 2
Input signals. The ADD display is In addit jon to any other selected
channel displays. In the ADD mode, a plus sign (+) is displayed
between the Channel 1 and Channel 2 VOL TS/DIV readouts.
NOTE
In ADD mode when AUTO LEVEL TRIGGER MODE or
CHOP VERTICAL MODE Is selected, the algebraic sum of
Channel 1 and Channel 2 displays provides the internal sig-
nal source for the trigger system when the trigger source is
VERT .
22 47A Operators
2-3

. ,0
Controls, Connectors, and Indicators
®
Channel 1 and Channel 2 VOLTS/DIV Switches-Select cali-
brat~d deflectlon factors for Channel 1 and Channel 2 from 2 mV per
division to 5 V per division In a 1-2-5 sequence of 11 steps.
The switches are detented, continuous-rotation controls with no end
stops. The VOL TS/DIV readouts reflect attenuation factors of cod ed
attenuator probes connected to the vertical inputs.
VERTICAL
E~ON@
MODE F
CH 1 ADO CH 2 CH 3 CH 4 CHOP
l0 • • • • 9,T
VOLTS/DIV
VOLTS/DIV
\ (§J :
5V 2mV 5V
13
:,~o p[\ CH 2r {ls)l s
BW~ , INVER~
~OUPLING I~ COUPLING
-:Q'.-AC -: Q'.-oc
2
0MHz l - •o'•-Ac -• 9' •- oc
-- 15 - . , ·
L ~f~i~ ~ ~ / ~f~~~
oRf3_ W -- C
1M@5 1M@5
6373 0
Figure 2-2. CH 1 and CH 2 vertical controls and Indicators .
2-4 2247A Op erator
@
@
®
®
Controls, Connectors, and Indicators
CH 1 AND CH 2 VOLTS/DIV VAR Controls-Allows the CH 1 and
CH 2 vertical deflection factors to be Increased up to at least 2.5
times.
Vertical deflection factors are greater than the VOL TS/DIV switch
setting when the UNCAL indicator is lit and.a greater-than symbol (>)
Is displayed to the left of the associated VOL TS/DIV readout.
NOTE
Normally the VOL TS/DIV settings are calibrated when the
VAR control is in the fully clockwise (detent) position. How-
eve r; if a front-panel setup had been recalled from the
Store/Recall Setup memory, it is; possible for the
VOLTS/DIV settings to be calibrated o,r uncalibrated with
the VOLT /DIV VAR ~antral in any position. When the con-
trols are rotated, normal variable operation returns.
UNCAL Indicator-Light~ when either CH 1 or CH 2 VOL TS/DIV set-
tings are uncalibrated (.variable function in effect).
SCOPE BW Button-Reduces the bandwidth of the vertical deflec-
tion system and trigger system to 20 MHz,when the button Is lit. The -
full bandwidth is available when the SCOPE BW button is not lit.
I
CH 2 INVERT Button-Inverts the Chai;inel 2 input signalJwhen the
INVERT button Is lit.
The Channel 2 Input signal In ADD mode 'and the Channel 2 trigger
signal pickoff are also inverted. A down-arrow symbol is displayed
between the Channel 1 and Channel 2 VOL TS/DIV readout when the
INVERT mode Is on.
®
COUPLING Buttons-Select the method of coupling input signals to
the Channel 1 and Channel 2 attenuators. ·
GND-Disconnects the input signal and grounds the input of the
associated vertical attenuator to provide a zero (ground) reference
voltage display.
The COUPLING switch Is In the ground position when the AC and the
DC buttons are not lit. A ground symbol ( rh )is displayed to the right
2247A Operators
2-5

,0
Controls, Connectors, and Indicators
of the associated VOL TS/DIV readout. The ground symbol Is also
dlsplayed after the value readout of any of the VOLTMETER
measurements.
AC-Capacltlvely couples the input signal to the vertical attenuator
when the AC button Is lit.
Turning on AC Coupling turns off DC Coupling. AC Coupling blocks the
de component of the Input signal. The lower -3 dB frequency limit Is
10 Hz or less when using either a 1X probe or properly terminated
coaxial cable; It Is 1 Hz or less using a compensated 1 OX probe . With
AC Coupling selected, an AC symbol (-) Is displayed to the right of
the associated VOL TS/DIV readout. An AC symbol is also displayed
after the value readout of any Peak or Peak-to-Peak voltage
measurement.
NOTE
When AC Coupling is selected for DC voltmeter measure-
ments an error message "SELECT DC COUPLING " Is
displayed.
DC-Couples de and all frequency components of the Input signal to
the vertical attenuator when the DC button Is lit.
Turning on DC coupling turns off AC coupling. With DC Coupling
selected, a DC symbol ( ;-;;-; ) Is displayed to the right of the asso ci-
ated VOL TS/DIV readout. Input resistance Is 1 Mil to ground .
Refer to Figure 2-3 for location of Items 18 through 23
@
CH 1 OR X and CH 2 Input Connectors-Connect signals to the
Inputs of Channel 1 and Channel 2 vertical attenuators.
Input connectors are BNC type with an outer contact ring for recog -
nizing attenuation factors of coded attenuator probes. A signal con -
nected to the CH 1 OR X Input connector produces the horizont al
deflection (X-Axls) In the X-Y horizontal mode. Any of the vert lcal
signal channels or ADD can provide vertlcal deflection (Y-Axls) for an
X-Y display.
@ PROBE ADJUST Connector-Outputs a 0.5 V square-wave slgnal
(at about 1 kHz Into a 1 Mil load) for compensating voltage probe s
and checking the vertical deflection accuracy.
2-6
2247A Operator s
]
I
I
I
Controls, Connectors, and Indicators
COUPLING LJ LJ COUPLING IRA Cf SCP
BEAM FINO
·: t t5 20MH, -: •·H ~
•
PROBE
ADJUST
.n IKHz
®
@
@
@
GNO GNO
BOTH Off BOTH Off
CH1 oR ~ CH 2 CH 3
'@) ~ fl_1Mfl20-pf!400-Vpk"
19 ~-
Figure 2-3. Vertical connectors and CH 3 and
CH 4 controls.
6373-04
Auxlllary Ground Jack-Provides an auxiliary chassis ground con-
nection (banana jack) between the equipment under test and the
2247A.
Channel 3 and Channel 4 POSITION Controls-Adjust vertical
position of Channel 3 and Channel 4 signal displays
J
Channel 3 and Channel 4 VOLTS/DIV Switches-..Select two basic
deflection factors for Channel 3 and Channel 4, 0.5 volt/division (but-
ton lit) or 0.1 volt/division (button not lit). '
The VOL TS/DIV switch setting displayed In the crt readout reflects
the attenuation factor of coded attenuator probes that are connected
to the vertical Inputs.
CH 3 and CH 4 Input Connectors-Connect signals to the Inputs of
the Channel 3 and Channel 4 vertical attenuators. Input coupling Is de
only.
The Input connectors are BNC with probe-coding ring contacts (the
same as Channel 1 and Channel 2) . The limited choice of deflection
factors for the Channel 3 and Channel 4 Inputs makes them useful for
digital and trigger signals.
2247A Operators
2-7

Controls, Connectors, and ·fndicators
Horizontal
Refer to Figure 2-4 for location of Items 24 through 31.
@ POSITION Control-Adjusts the horizontal pos i tion of the waveform
displays on the crt.
®
2-8
X10 MAG Switch-Magnifies the A and B sweeps by a f actor of 10
and extends the fastest sweep speed to 2 ns per division. The cent r
portion of an unmagnified sweep display will be within O.5 division of
the center of a magnified sweep display. No action occu rs In X Y
mode .
When X10 MAG Is on, a X10 symbol ls displayed next to th e SEC/DIV
readouts. The readouts reflect correct display sweep speed s for th
X10 MAG displays and the unmagnified displays.
MODE Buttons (Up-Arrow and Down-Arrow) and I ndi-
cators-Select the operating mode of the horizontal defl ection
system. Pressing the Up-/Down-Arrow buttons selects the horlzont I
deflection mode as shown by the MODE lights. Not all Menu M easur
ment modes are compatible with all horizontal deflection mod es. So
Table 3-1, Behavior for Horizontal MODE Changes , in Sect ion 3.
A-Selects A sweep horizontal deflection . The A sweep speed
determined by the A SEC/DIV switch setting as displayed In the crt
readout. Whenever A MODE is selected , the A/B SELECT sw itch I
set to A Trigger.
ALT-Alternates between A sweep (with an Intensified zone repr
sentlng B sweep) and B delayed sweep . Both A and B SEC/DIV switch
settings are displayed In the crt readout, but only the B can b
adjusted. Whenever ALT MODE Is selected , the A/B SELE CT switch
Is set to B Trigger.
The B sweep speed cannot be set slower than the A sweep speed:
attempting to do so forces the A sweep speed to follow the B sweep
speed . To Increase the A sweep speed in the ALT MODE, set the
Horizontal MODE to A, adjust the SEC/DIV switch to a faster A sweep
setting, and reset the Horizontal MODE switch to ALT. The B sweep
speed and the length of the intensified zone are determined by th e B
SEC/DIV switch setting.
2247A Ope rators
Controls, Connectors, and Indicators
•
•
HOLD : MIN SETUP
CURSORS/TIME POSITION
f,;;;\ XlO MAG
~•
UNCAL :
A
ALT A AND 8 SEC/DIV
B
f:11
TRACE SEP
~
-Q-POSITION
{>~ '
F igure 2-4 . Horizontal controls and Indicators.
- J
6373-0SA
B-Se l ec t B sweep horizontal deflection . The B sweep speed is
deter mi ned by the B SEC/DIV switch setting as displayed in the crt
readout . Whenever B MODE is selected , the A/8 SELECT switch is
set to B Tr igger.
The sta rt of the B sweep in RUNS AFTER mode (or the arming of the
B Trigger in any triggered mode) is delayed from the start of the A
sweep by a t ime determined by the setting of the If- OR DELAY con-
trol. The B SEC/DIV switch setting and the Delay Time Position
2247A Operat ors
2-9

, ,0
Controls, Connectors, and Indicators
®
®
setting are displayed In the crt readout. A greater-than sign (>) Is
displayed in front of the Delay Time readout if the B Trigger MODE Is
not RUNS AFTER.
X-Y- The signal applied to CH 1 OR X input connector produces the
horizontal (X-Axls) deflection. Signals applied to any vertical Input
connector or ADD may be selected to provide the vertical deflect ion
(Y-Axis).
The X-Y displays are horizontally positioned by the Horizontal
POSITION control and vertically positioned by the associated ver ti ca l
channel POSITION control .
A AND B SEC/DIV Switch-Selects the horizontal deflection rate
(sweep speed) for both the A sweep and the B sweep in a 1- 2- 5
sequence. Calibrated sweep speeds are obtained with the A and B
SEC/DIV VAR control in the detent (fully clockwise) position. The A
SEC/DIV switch setting is set only from the A Horizontal MODE and
the B SEC/DIV switch is set only from the ALT or B Horizontal MO DE .
NOTE
The B sweep speed can never be slower than the A sweep
speed. When the two sweep speeds are the same, they are
M locked." At this point A will follow B to slower SEC/DIV
settings (In ALT or BJ and B will follow A to faster settings
(In A).
A SEC/DIV-The calibrated A sweep speed Is selectetl only in A H or i-
zontal MODE from O. 5 s per division to 20 ns per division (X1O M AG
off).
B SEC/DIV-The calibrated B sweep speed Is selected either in ALT
or B Horizontal MODE from 5 ms per division to 20 ns per division (X1O
MAG off).
A and B SEC/DIV VAR Control-Provides continuously variable,
uncalibrated A and B sweep speeds to at least 2.5 times slower th an
the calibrated SEC/DIV setting.
The VAR control extends the slowest A sweep speed to at l east
1.25 sec per division. The UNCAL Indicator Is lit and a greater - than
sign (>) Is displayed before each SEC/DIV readout value when the
sweep speeds are greater than the SEC/DIV settings.
2-10
2247A Operat or s
@
Controls, Connectors, and Indicators
NOTE
Normally the SEC/DIV settings are calibrated when the VAR
control is in the fully clockwise (detent) position . However ,
if a front-panel setup had been recalled from the
Store/Recall Setup memory, it is possiqle for the SEC/DIV
settings to be calibrated or uncalibrated with the SEC/DIV
VAR control in any position . When the controls are rotated,
normal variable operation returns .
CURSORS/TIME POSITION Controls-Sets the reference and
delta cursors on the display.
NOTE
The reference and delta cursors will only track together as
long as the reference delay plus the delta delay is less than
10 times the A SEC/DIV, setting (10 horizontal graticule
divisions): The cursors cannot be positioned left of the 1st
or right of the 11th vertical graticule lines.
I~ ,oR DELAY- This control has the following functions :
1. Positions the reference and delta cursors together in a cursor
measurement mode. (Volts measurement in A, ALT, B, or
X- Y Horizontal MODES; TIME measurement In A or -B
1
Hori-
zontal MODES.) '
2. Positions the reference and delta delays together In the TIME
measurement modes In the ALT or B Horizontal MODE.
3. Sets the B sweep delay time in the ALT or B Horizontal Mode in
DELAY measurement mode.
4. Positions the Intensified zone for GA "f ED VOLTMETER and
GA TED C/T measurements.
5. Selects the character to be altered In the AL TEA LABEL menu
of Store/Recall.
41 -This control has the following functions:
1. Positions the delta cursor In the cursor measurement mode.
2247A Operators
2-11