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TEKOPERATORS
MANUAL 070-6014-00
Product Group 38
2465A/2455A/2445A
OSCILLOSCOPES
and OPTIONS
First Printing JUN 1986
Revised FEB 1987
Please Check for
CHANGE INFORMATION
at the Rear of This Manual
COYMTTED TO EXCEu.ENCE

Copyright ® 1986 Tektronix, Inc. All rights reserved.
Contents of this publication 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. TELEQUIPMENT
is a registered trademark of Tektronix U.K. Limited.
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 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:
BOOOOOO
100000
200000
300000
700000
Tektronix, Inc., Beaverton, Oregon, USA
Tektronix Guernsey, Ltd., Channel Islands
Tektronix United Kingdom, Ltd., London
Sony/Tektronix, Japan
Tektronix Holland,
NV, Heerenveen,
The Netherlands

Certificate of the Manufacturer/Importer
We hereby certify that the __ 2_4_6_5A_,_2_4_55_A_,_2_4_45_A_0_S_C_IL_L_0_SC_0_PE_S __
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
Bescheinigung des Herstellers/lmporteurs
Hiermit wird bescheinigt, daB der/die/das __ 2_4_6_5A....:,_2_4_55_A....:.,_2_44_5_A __
OSCILLOSCOPES AND ALL INSTALLED OPTIONS
in Ubereinstimmung mit den Bestimmungen der Amtsblatt-Verfugung
1046/1984 funkentstort ist.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerates
angezeigt und die Berechtigung zur Uberprufung der Serie auf Einhalten
der Bestimmungen eingeraumt.
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 fiir den Benutzer/Betreiber:
Die vom Betreiber zusammengestellte Anlage, innerhalb derer dies
Gerst eingesetzt wird, muB ebenfalls den Voraussetzungen nach Par. 2,
Ziff. 1 der Vfg. 1046/1984 genugen.
NOTICE to the user/operator:
The German Postal Service requires that this eqUipment, when used in a
test setup, may only
be operated if the requirements of Postal
Regulation, Vfg. 1046/1984,
Par. 2, Sect. 1.7.1 are complied with.
HINWEIS fUr den Benutzer/Betreiber:
Dies Gerat dart in MeBaufbauten nur betrieben werden, wenn die
Voraussetzungen des Par. 2, Ziff. 1.7.1 der Vfg. 1046/1984 eingehalten
werden.

Contents
Page
Illustrations .................................................................................................. iv
Tables ..........................................................................................................v
Operators Safety Summary ........................................................................
vi
The 2465A. 2455A. 2445A ......................................................................... ix
1 Generallnformation
Preparation for Use..................................................................................... 1-1
Safety ..................................................................................................... 1-1
Line Voltage Selection ........................................................................... 1-1
Line Fuse................................................................................................ 1-1
Power Cord ............................................................................................ 1-3
Instrument Cooling................................................................................. 1-4
Start-up .................................................................................................. 1-4
Repackaging For Shipment......................................................................... 1-5
2 Operation
Fundamentals............................................................................................ 2-1
Getting a Display ...................................................................................... 2-1
Vertical ...................................................................................................... 2-2
Horizontal.................................................................................................. 2-4
Trigger Controls........................................................................................ 2-4
Video Triggering........................................................................................ 2-6
Readout..................................................................................................... 2-8
Measurements with Cursors.................................................................... 2-10
Display Operation ..................................................................................... 2-12
Signal Connections................................................................................... 2-12
Magnify Waveform Details with Delayed-Sweep..................................... 2-13
B-Trigger Operation.................................................................................. 2-14
Delta-Delay-Time....................................................................................... 2-15
Single-Delay-Time Measurements............................................................ 2-16
Precision Timing........................................................................................ 2-17
Triggered Delta-Delay-Time Measurements............................................ 2-18
Time Interval Resolution........................................................................... 2-20
Measurement Updating ............................................................................ 2-20
Frequency. Period. and Totalize Counting............................................... 2-22
Delay Sweeps by Event Counts............................................................... 2-23
Logic Triggering ........................................................................................ 2-28
Word Recognizer Operation..................................................................... 2-30
The Word Out Signal................................................................................ 2-31
DMM ......................................................................................................... 2-31
Save and Recall Operation....................................................................... 2-32
2465A/2455A/2445A Operators

Contents
Page
3 Applications
Peak-to-Peak Voltage ............................................................................ 3-1
Absolute Voltages .................................................................................. 3-1
Noise Immunity....................................................................................... 3-2
"Quick and Dirty" DC Voltage Measurement........................................ 3-2
Amplitude Modulation ............................................................................ 3-2
Frequency Modulation ........................................................................... 3-3
Measuring Video Signals in IRE Units .................................................. 3-4
Avoiding False Displays with Multi-Mode Signals ................................ 3-4
Algebraic Addition to Detect Coincidence or Cancel Interference........ 3-4
Observing Coincidence of Digital Signals ............................................. 3-5
Measuring Off-Ground Signals And Cancelling Interference ................ 3-5
Period and Frequency ............................................................................ 3-6
Rise Time and Fall Time ........................................................................ 3-7
Propagation Delay ................................................................................. 3-8
Setup and Hold Times ........................................................................... 3-8
Slew Rate ............................................................................................... 3-9
Time Ratio .............................................................................................. 3-1 0
Phase Difference Between Two Signals.. ............................................. 3-11
4 Checks and Adjustments
Introduction ............................................................................................ 4-1
Initial Setup ............................................................................................ 4-1
Trace Rotation and Adjustment .. .......................................................... 4-1
Astigmatism Adjustment ........................................................................ 4-2
Auto DC Balance Routine ...................................................................... 4-2
Probe Compensation .. ........................................................................... 4-3
Matching Channel 2 Delay ..................................................................... 4-4
Amplitude Check .................................................................................... 4-5
Timing Check ......................................................................................... 4-5
5 Controls, Connectors, and Indicators
Introduction ............................................................................................ 5-1
Power And Display ................................................................................ 5-1
Setup and Vertical.................................................................................. 5-4
Horizontal ............................................................................................... 5-11
Delay and Delta Controls....................................................................... 5-14
Rear Panel .............................................................................................. 5-25
DMM.......................................................................................................5-27
DMM Displays ..................................................................................... 5-31
Display-Mode Interactions .................................................................. 5-31
2465A/2455A/2445A Operators

Contents
Page
6 Performance Characteristics
Performance Conditions........................................................................ 6-1
7 Options and Accessories
Introduction ............................................................................................ 7-1
Option 11 ................................................................................................ 7-1
Option 1R............................................................................................... 7-1
Power Cord Options .............................................................................. 7-2
Standard Accessories............................................................................ 7-3
Optional Accessories ............................................................................. 7-4
A AppendixA
Extended Functions with Diagnostic Exercisers ........................................ A-1
8 AppendixB
Sequence Programming and Operation................................................ B-1
Executing Sequences............................................................................. B-3
C AppendixC
Power Up Tests........................................................................................... C-1
Kernel Test ............................................................................................. C-1
Confidence Tests ................................................................................... C-1
o AppendixD
Delta-Time and Delta-Delay-Time Accuracy under Noted
Conditions for the CIT
IT Option............................................................ 0- 1
Delay-Time Accuracy under Noted Conditions for the
CIT IT Option .......................................................................................... 0-2
2465A/2455A/2445A Operators
iii

Contents
Illustrations
Figure Page
1-1 Line selector switch, line fuse, and detachable power cord ......................... 1-3
2-1 Readout display locations.............................................................................. 2-9
3-1 Instantaneous voltages .................................................................................. 3-1
3-2 Eliminating common-mode signals ................................................................ 3-6
3-3 Measuring
rise times...................................................................................... 3-7
3-4 Time between two pulses (cursor method) ................................................... 3-9
3-5 Time ratio (duty factor}................................................................................... 3-10
3-6 Phase difference between two signals........... .... ........................................... 3-11
3-7 Small-angle phase difference......................................................................... 3-11
4-1 Probe low-frequency compensation .............................................................. 4-3
5-1 Power and display controls ........................................................................... 5-3
5-2
SETUP and MODE buttons, and CH 1 and CH 2 POSITION controls ....... 5-5
5-3
Channel 1 and Channel 2 controls and connectors...................................... 5-7
5-4
CH 3 and CH 4 controls and connectors and CALIBRATOR output .......... 5-9
5-5
Horizontal and delta measurement controls.... ..... ......................................... 5-11
5-6 Trigger controls and indicators.. ... ................... ..... ......................................... 5-18
5-7 Rear panel controls and connectors.............................................................. 5-26
5-8 DMM controls and connectors ...................................................................... 5-28
6-1 Dimensional drawing ...................................................................................... 6-35
iv 2465A/2455A/2445A Operators

Contents
Tables
Table Page
1-1 Power Cord and Voltage Data...................................................................... 1-2
2-1 Resolution Selections..................................................................................... 2-21
2-2 Auto Resolution.............................................................................................. 2-21
2-3 Delay-by-Events Combinations...................................................................... 2-24
2-4 Sweep
Triggering ........................................................................................... 2-29
6-1 2465A/2455A/2445A Electrical Characteristics ............................................ 6-6
6-2
Option 01 (DMM) Electrical Characteristics .................................................. 6-15
6-3
Option 05 (TV) Electrical Characteristics....................................................... 6-22
6-4
Option 06 (C/T/T) Electrical Characteristics.................................................. 6-24
6-5
Option 09 (WR) Electrical Characteristics ..................................................... 6-31
6-6 Option 10 (GPIB) Electrical Characteristics................................................... 6-33
6-7 Mechanical Characteristics ............................................................................ 6-34
6-8
Environmental Requirements ......................................................................... 6-36
C-1 Confidence Test Numbers and Affected Functions....................................... C-2
2465A12455A12445A Operators v