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Tektro COMMITTED TO
1X@
E XCELLE N CE
PL EAS E C HE CK FOR C HANGE I NFORM ATION
AT THE R E AR O F T HIS MANUAL.
7S11
SAMPLING
UNIT
INSTRUCTION MANUAL
"
Tektro n i x , Inc.
. . Box 500
B eaverto n , Orego n
97077 Serial Nu mber
F irst P ri n ting F EB 1970
070-0985-00 Revised JU N 1981
Co pyrig h t ' 1970 Te ktro n ix, I n c. All rig h ts reser v e d .
Conte n ts of this p u blication may n ot be reproduced in
anyform without t h e written permission of Te k tronix, Inc .
P roducts of Te k tronix, Inc . and its s ub sidiaries are
covered by U .S . and foreig n patents a n d'or p e n ding
pate n ts.
TEKTRONIX, , SCO PE- MO B IL E , and are
registere d trademar k s of Tektronix, Inc . T ELE Q U IP-
is registere d trademar k of Tektronix U .K
L imite d .
P rinte d in U Specification and
.
.S price c h a n ge
pri v ileges are reser v ed .
TABLE OF CONTENTS
SECTION 1 SPECIFICATION Page
General Information 1-1
Electrical 1-1
Environmental Characteristics 1-2
Physical Characteristics 1-2
SECTION 2 OPERATING INSTRUCTIONS
General Information 2-1
Installation 2-1
Mating 2-1
First-Time Operation 2-2
Equivalent-Time Sampling Operation 2-2
Controls and Connectors 2-2
Basic Operating Information 2-2
Basic Applications 2-9
SECTION 3 BASIC SAMPLING PRINCIPLES
Introduction 3-1
Basic Sampling Techniques 3-1
Effective Sampling Time 3-4
Traveling Wave Sampling Gate 3-5
Dot Response (Loop Gain) 3-5
Smoothing 3-5
Smoothing of Random Noise 3-6
Tangential Noise 3-7
Display Sensitivity-Deflection Factor 3-7
DC Offset 3-7
Real-Time Sampling 3-8
Sweep Rates 3-8
SECTION 4 CIRCUIT DESCRIPTION
Introduction 4-1
Block Diagram 4-1
Feedback Loop and Pulse Amplifier Chain 4-1
Vertical Output Amplifier 4-1
TA BLE O F CO NT EN TS (cont)
Sweep U nit Drive 4-1
R ead out L ogic 4-3
Circuit Descri ption 4-3
Trigger L ogic 4-3
Post Amplifier and Attenuators 4-3
Memory 4-5
Out put Amplifier 4-8
Real Time Oscillator 4-8
Gate Generator 4-9
R eadout L ogic 4-11
Power Distribution and Decoup ling 4-11
SECTIO N 5 MAI N TENANCE
Introduction 5-1
Preventive Maintenance 5-1
General 5-1
Cleaning 5-1
L ubrication 5-1
Visual Inspection 5-1
Calibration 5-1
Parts I dentification 5-1
Parts Rep lacement 5-2
Troubles hooting 5-4
Introduction 5-4
Troubleshooting Aids 5-4
Troubleshooting Tec hniq ues 5-5
Transistor Checks 5-5
Diode Checks 5-5
F ield Effect Transistors (FE T) 5-6
Repackaging for Shipment 5-7
SECTION 6 PERFORM ANCE CHECK/CA L I BRATION
Introduction 6-1
Test E qui pment Required 6-1
Short F orm Procedure 6-2
Preliminary Procedure 6-3
Check -12 .2-V olt Power Supply 6-5
Check Interdot B lan king 6-6
Chec k Dot Response and Smoothing 6-7
Adj ust Memory Gate Width (13460) and
Memory Gain (C275) W ith Normalizer H ead 6-7
REV . , JULY, 1977
TABLE OF CONTENTS (cont)
Adjust Memory Gate Width (R460) and
Memory Gain (C275) With Sampling Head 6-8
Adjust Variable Balance (13305) and
Smoothing Balance (13245) 6-9
Check Deflection Factor Accuracies,
Variable Control Range and Adjust GAIN 6-10
Check Memory Overdrive Recovery 6-11
Check Vertical Signal Out 6-11
Check Vertical Gain Change in SMOOTH 6-11
Check Memory Slash 6-11
Check Delay 6-12
Check/Adjust Real Time Sampling (13415) 6-12
Check DC Offset and Adjust Position (13325) 6-12
Check Real-Time Trigger Amplifier Output 6-14
SECTION 7 ELECTRICAL PARTS LIST
Abbreviations and Symbols
Parts Ordering Information
Index of Electrical Parts List
Electrical Parts List
SECTION 8 DIAGRAMS AND MECHANICAL PARTS ILLUSTRATIONS
Diagrams
Mechanical Parts Illustrations
Repackaging Instructions
SECTION 9 MECHANICAL PARTS LIST
Mechanical Parts List Information
Index of Mechanical Parts Illustrations
Mechanical Parts List
Accessories
CHANGE INFORMATION
Abbreviations and symbols used in this manual are based on or
taken directly from IEEE Standard 260 "Standard Symbols for
Units", MIL-STD-12B and other standards of the electronics
industry . Change information, if any, is located at the rear of
this manual .
Fig . 1-1 . 7511 Sampling Unit .
7511
SECTION l
7S11 SPE CI F ICA
Change info rmation, if any, affecting this section will be fo undat the rea r of the manual.
General Information TA BLE 1-1 (con t)
The 7511 Sampling U nit is single ch a nnel vertical Characte ristic Performa nce
amplifier plug-in unit d esigned for operation in Tektron ix N ORM A L/
Gain Accuracy W it hin 3% when
7000-Series Oscillosco pes . The 7511 accepts the S-Series
( Ratio to add SMOOT H function is N ORM A L,
Sampli ng H eads. The Samp li ng H ead dete rmi nes the i nput with GAI N adj usted at any U nits/
to accuracies of
ch a racteristics and t he availability of t r igge r pickoff.
source, oscillo- Division switch setting. W ithi n 6%
scope, attenu- when NO RM AL/S MOOTH fu nc-
ators, etc.) tion is SMOOTH .
The S-Series Sa mp li ng H ead used can be pl ugged into the
7511 or used remotely on an optional extend er cable unit. Extends deflection factor from 1
Un its/Divisio n
The 7511 provides the power fo r t he sampli ng hea d . unit/division or less to at least 400
Va riable R ange
Interconn ections to th e sampli ng h ead circuits are p rovi ded u nits/division.
by the connector in t he sampling h ead compartment of the
7511 . GAIN Ra n ge Permits ad justment of d eflectio n
factor at any Un its/Division switch
setting for all 7000-series oscillo-
T he 7511 and 7T1 Sampling Sweep U nit operated in scopes .
t he center p l ug-in compartments of 7000-Series
oscilloscope provide si ngle c hann el sampling system . Two DEL AY R ange At least 10 ns.
7S1 1's and one 7T1 provide d ual-trace sampli ng, using t he M emory Slash 0.1 division or less at 20 Hz for
electronic switching in the oscilloscope vertical am plifier . ambient te mperatu re of 0