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1 ST FZ U CTI
VAL
. Serial N u mber
7A11
A MPL I F I ER
Tek tr onix, Inc .
S. W . M illi k an W ay " . . Box 500 " B eaverton, Oregon 97005 " Ph one 644-0161 " Cables : Te k tro n ix
1 269
070-0984-00
WARRANTY
All Tektronix instruments are warranted
against defective materials and workman-
ship for one year . Tektronix transformers,
manufactured in our plant, are warranted
for the life of the instrument .
Any questions with respect to the war-
ranty mentioned above should be taken
up with your Tektronix Field Engineer .
Tektronix repair and replacement-part
service is geared directly to the field,
therefore all requests for repairs and re-
placement parts should be directed to the
Tektronix Field Office or representative
in your area . This procedure will assure
you the fastest possible service . Please
include the instrument Type and Serial or
Model Number with all requests for parts
or service .
Specifications and price change privi-
leges reserved :
Copyright ' 1969 by Tektronix, Inc .,
Beaverton, Oregon . Printed in the United
States of America . All rights reserved .
Contents of this publication may not be
reproduced in any form without permis-
sion of the copyright owner.
TA BLE OF CO N TEN TS
S E CTIO N 1 S PE CI F ICATIO N
Introduction 1-1
E lectrical
Deflection Facto r 1-1
Gain 1-1
Freq uency Response 1-1
Maximum Input V oltage 1-2
Input R and C 1-2
Maximum Gate Current 1-2
Noise 1-2
DC Drift 1-2
Drift With Ambient Temperature 1-2
Trace ID EN TI F Y 1-2
OFFSE T Range 1-2
OFF S E T OU T 1-2
50 Termination/Adapter 1-3
Environmental
Probe 1-3
Temperature 1-3
Altitude 1-3
Vibration 1-3
Sh oc k 1-5
Plug-in
Altitude 1-5
Ph ysical
Finis h 1-5
Dimension 1-5
Weig h t 1-5
SE CTIO N 2 OPER ATI N G I N ST RUCTIO N S
General 2-1
Plug-in Insertion/ R emoval 2-1
Probe R emoval/Storage 2-1
External Controls and Connectors 2-1
Accessories Information 2-5
First Time Operation
ST EP BAL Adju stment 2-5
ID EN TI F Y 2-6
BA N DW IDT H 2-6
GAI N 2-6
PO L A R ITY 2-6
O FF S E T 2-6
Probe Operation 2-7
Unscaled Deflection Factors 2-7
Input Capacitance 2-8
TABLE OF CONTENTS (cont)
SECTION 3 CIRCUIT DESCRIPTION
Block Diagram Description 3-1
Probe Circuit Description 3-2
Input Amplifier 3-3
Output Amplifier 3-4
Offset Generator 3-5
Volts/Div Switch and Readout 3-6
Power Supplies and Output Connectors 3-7
SECTION 4 MAINTENANCE
Preventive Maintenance
General Information 4-1
Cleaning 4-1
Visual Inspection 4-1
Lubrication 4-1
Transistor and Integrated Circuit Checks 4-1
Recalibration 4-1
Troubleshooting
Test Equipment 4-1
General Techniques 4-2
Troubleshooting Basic Components 4-2
Troubleshooting Chart 4-4
Corrective Maintenance
Parts Procurement 4-5
Screwdriver Requirements 4-8
Soldering Equipment and Techniques 4-8
Probe Data 4-9
Plug-in Unit Data 4-10
Circuit Board Illustrations 4-12
SECTION 5 PERFORMANCE CHECK/CALIBRATION
General 5-1
Calibration Procedure Instructions 5-1
Performance Check Instructions 5-1
Calibration Index and Record Instructions 5-1
Equipment Required 5-1
Detailed Procedure 5-6
SECTION 6 ELECTRICAL PARTS LIST
Abbreviations and Symbols
Parts Ordering Information
TABLE OF CONTENTS (cont)
SECTION 7 DIAGRAMS
Electrical
Mechanical Parts List Illustrations
Accessories
SECTION 8 MECHANICAL PARTS LIST
Mechanical Parts List Information
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 . 7A1 Amplifier .
711
S E CTIO N 1
S PE CIF ICATIO N
Change information, if any, affecting this section will be found at the rear of the manual.
I ntrod uction TA BLE 1-1
T he 7A1 Am p lifier is versatile p l ug-in am plifier u nit 711 Amplifie r Specificatio n
whic h provides DC to 150 MHz b andwidth with Te k-
tronix 7700-Series Oscillosco pes . When d esired, the u pper Characteristic Performance R equirement
f requency -3 dB point can be limited to 20 MHz by
front-panel switch. ELECT R ICAL
Deflection Factor
(VOLTS/DI V)
Calibrated deflection factors of from 5 mV to 20 V per
division are provi ded in 1-2-5 se que nce . In ad dition, va ri- Calibrate d R ange 5 mV/div to 20 V/div ; 12 ste p s in
able gain control makes it possible to set the amplifier to 5, 10, 20 sequ ence
any deflection facto r between 5 mV a nd 50 V pe r division.
Gain R atio W it hin 2% of GAI N adjusted at 0.1
Accuracy V /div
perma nently attached probe provides low-input capa-
citance (2 .0 pF at 2 V /division, 5.8 pF at 5 mV/division)
U ncalib rated Continuously variable ; exte nd s de-
while maintaining h ig h i np ut resista nce (1 ). BN C-
flection factor to at least 50 V /div
connecto rs can be attached to the p robe t hro ugh probe-
tip to BN C-female a d apter. This ad apter serves as t h e
p ro be's in put co nn ector wh e n the probe is sto red, but can GAI N Permits adjustment of deflection
be attached to th e p robe ti p whether or n ot the probe is facto r at 0.1 V/div for all Oscillo-
stored in the plug-in unit . scopes
F reque ncy R espo nse
50 termination/adapter (standard accessory) per- (8 Division Reference)
mits im pedance matching fo r u se of the probe in 50
Bandwi d th, Direct
e nvi ronme nts . Wh en th e terminatio n/adapter is u sed, low
standing wave ratio (VS WR) can be ex pected . The VSWR Coupled In put
can be furt he r red uced by inse rti ng 2 atte nuator n the i FULL Mode DC to 150 MHz with 7700-Series
signal p ath a h ead of the 50 termination/a d apter. Ap prox- Oscillosco pe
imate values of V SWR wh ich can be expected und er both
cond itions a re sh own in Fig. 1-4. DC to 90 MHz with 7500-Series
Oscillosco pe
T he perform ance specification of the 7A 11 Amp lifier is 20 MHz M ode DC to 20 MHz within 2 MHz
d escribed in d etail in Ta ble 1-1 . The specification is valid
un der the followi ng condition s:
Ca pacitive Coup led 15 Hz or less
Lower F requency
-3 dB Limit
Calibration must h ave been pe rformed at an ambient
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