Tektronix 7a11 User manual

1 Ν ST F Z U
CTI
ΟΝ
ΜΑΝ
VAL .
Serial N u mber
7A11
A MPL I F I ER
Te
k tr onix, Inc
.
S . W .
M illi kan W ay
"
Ρ . Ο . Box 500
" B eaverton, Oregon 97005 " Ph one 644-0161
" Cables : Te k tro n ix
070-0984-00

1 269

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
O F CO N T
EN TS
S E CTIO
N 1
S E
CTIO N 2
S PE CI F ICATIO
N
Introduction
1-1
E lectrical
Deflection
Facto r
1-1
Gain
1-1
Fre q uency R esponse
1-1
M aximum Input
V oltage
1-2
Input R and
C
1-2
Maximum
GateCurrent
1-2
N oise
1-2
DC
Drift
1-2
Drift Wit h Ambient
Temperature 1-2
Trace ID EN TI F
Y
1-2
O FF S E T Range
1-2
O FF S E T O U
T
1-2
50
Ω Termination/Adapter
1-3
En
vironmental
Probe
1-3
Temperature
1-3
Altitude
1-3
V ibration
1-3
S h oc k
1-5
Plug-in
Altitude
1-5
Ph
ysical
Finis h
1-5
Dimension
1-5
Weig ht
1-5
O PER ATI N G I N ST
RU CTIO N S
General 2-1
Plug-in Insertion/ R emoval 2-1
P
robe
R emoval/Storage 2-1
External Controls and Connectors 2-1
Accessories Information 2-5
First Time Operation
ST EP ΑΤΤΕΝ B A L Ad ju stment 2-5
ID
EN
TI F Y 2-6
BA N D W 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 Ca p acitance
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
SECTION 8

MECHANICAL PARTS LIST
CHANGE INFORMATION
Electrical
Mechanical Parts List Illustrations
Accessories
Mechanical Parts List
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 .

7A11
Amplifier .

I n tro d uctio n
T h e

7A11 Am p
lifie r is α versatile p l u g-in am p lifie r u n it
w h ic h pr ovi d es α
DC to 150 MHz b andwi d t h with Te k -
tronix 7700-Se r ies
Oscillosco p es . Wh en d esi r ed, t he u pp er
f r e q uency -3 dB point can be
limited
to
20 MHz by α
fro n t- p anel switc h .
Calib r ate d d eflection factors of fro m 5 m V to 20 V per
divisio n are p rovi ded in 1-2-5 se quen ce . In ad d ition, α va r i-
able
gain control ma k es it possible to set t h e amplifier to
any deflection facto
r
between
5 mV a n d 50 V pe r d ivision .
Α p erma n en tly attac hed p robe provi d es low-input capa-
citance (2 .0 pF at 2 V / d ivision, 5 .8 pF at 5 mV /division)
w h ile mai n tai n i ng h ig h
i
np ut r esista nce (1 ΜΩ ) . BN C-
conn ecto rs can be attac he d to t he p
r
ob e
t
h ro ugh α pro b e-
tip to BN C-female a da p ter . T h is adap ter serves as t
he
p ro b e's in pu t conn ecto
r
w
hen
t he p r obe is sto
r
ed, but can
be attac
h
ed
to t he
p
r ob e ti p w h
et
h er or n ot t h e pro b e is
sto r e d in t he p l u g-in unit .
Α 50 Ω termination/adapte
r
(stan d ard accesso
r y)
pe
r -
mits impedan ce matc h i n g fo
r u
se of
t h e probe i n 50 Ω
en vi r on me n ts . Wh en t
h
e
terminatio n /ada p ter is u se d , α low
stan d i ng wave r atio (V S
WR) can b e exp ecte d . T he V S WR
can be furt h er r e
d
uced b
y i n se r ti n gα2 Χ atte nuato r i n t he
sig n al
p
ath a
h
ea
d of t he 50 Ω termi n ation/a d apter . Ap p rox-
imate values of V S
WR w h
ic
hcan beexpectedun d er both
con d itions ar e sh ow
n in Fig . 1-4 .
T he p erfo rm ance s p
ecification of the
7A
11 A mp lifie r is
d escribe d in d etail in Ta b le
1-1 . T he specification is valid
unde r t he followi ng conditio
ns
:
(M
Change info r matio n , if an y, affecting this section
will be fo und at t he r ea r of t he ma n ual
.
Calib
r atio n m ust h ave been pe r forme d at an ambient
tem p eratu
r
eb etwee
n +20 ° C and +30 ° C .
Ope r atio n m u st be wit
h
i
n
any
specifie d enviro n me n t,
in α cali br ated Oscilloscope,
after twe n ty min u tes of
wa r mup .
S E CTIO N 1
S PE CI F
ICATIO N
REV .
M AR 1974
TA BLE 1-1
7 Α 11 Amplifie r Specificatio n
7
Α 11
C h a r acte r istic Perfo r mance R e q uirement
ELE CT R ICA L
Deflectio n F actor
( VO L TS/DI V )
Calibrate d R ange 5 m V / d iv to 20 V /div ;
12 ste
p
s i n
5, 10, 20 se qu en ce
Gain
R atio W it h in 2% of GAI N a dju ste d at 0 .1
Accuracy
V /div
U ncalib
r
ate
d Contin uously varia b le ; exte nd s de-
flection facto r to at least 50 V /div
GAI N
Permits adju stme n t of deflection
facto
r
at 0 .1
V/ d iv fo r
all
Oscillo-
scopes
F re q uency R espon se
(8
Divisio n R efe r ence)
Ba nd wid t h , Direct
Cou p led In p ut
FULL
M ode DC to 150 MHz with 7700-Se r ies
Oscillosco p e
DC to 90 MHz
wit h 7500-Series
Oscillosco p e
20 MHz M ode
DC to 20
MHz
wit h in 2 MHz
Ca p acitive Co up led 15 Hz
or less
L ower Frequency
-3 d BL imit
R isetime 2 .4 ns or less with
7700-Se r ies
Oscilloscope
3 .9 n s o r less with 7500-Se r ies
Oscilloscope
R iseti m e (6 Div 1 .40 n s or less 5
m V -20 V/ d iv with
R eference) 7904 oscilloscope
.

Specification-7A11
TA BLE 1-1 (co n
t)

TA
BLE 1-1 (cont)
Ch
aracteristic Performance Re q uireme n t
DC Drift
Drift With Time
(Ambient Tem p er-
ature and L ine V ol-
tage Constant)
Sh ort Term 0 .1
d ivision or less d uri n g any
1
minute
interval with in 1 h our after
20 minutes
f r om turn-on
L o ng Term
0 .3 division or less duri
n g
any
h our
after 20 minutes from turn-on
D r ift W it h Am
b ient
Tem p
erature change
( L ine V
oltage Constant)
Plug-in Only
200 μ V / ° C or less
P
ro
be
Only
200 μ V / ° C or less
Trace ID EN TI F Y 0 .2 to 0 .3
division u pward trace
s h ift
O FF S E T Range
5 m V / d iv t h ru
+1 V to -1 V
50 mV / d iv
0 .1 V / d iv t h ru
+20 V to -20 V
1 V /div
2 V /div th ru
+400 V to -400 V
20 V /div
O
FF
S
E TO U T
Ra
n
ge +1
V to -1 V (nominal)
Ratio of Offset
Range to O
FF S E T
O U T
5 m V /div t h
ru 1 :1 with in 1°/ ο p lus 0 .5 m V at O
FF-
50 mV / d iv
S E TOUT j ac k
0 .1 V /div
t h ru 20 :1 wit h in 1 .5% ο p l us 0 .5
m V at
1 V /div
O FF S E TOU T j ac k
2 V /div th ru 400 :1 with in
2% p lus 0 .5 mV at
20 V / d iv O
FF
SE
TO UT j ac k
Sou r ce
Resistance 500 Ω with in 3°/ ο
Ch a r acte r istic
P erforma n ce Re q uirement
M axim
u m I npu t V olt-
age Wit h or
Wit h out
AC Cou p ler
I n stalled
DC
+ P
ea
k AC 200 V ; AC com p one n t not to ex-
cee damplitude specified u
n
d er AC
AC, continuous
wave
5 m V
t h ru 200 V pea k to 50 kH
z ; see F ig . 1-2
50 mV for amplitu de de
r ating due to fre-
quencies above
50 kH z
0 .1 V
t
h
r u 200 V peak to 40 MHz ; see
F ig . 1-2
1
V for am p litude d erating
due to fre-
q uen cies a b ove 40 MH
z
2 V t h r u 200
V pea k to 70
MHz
; see F ig . 1-2
20 V for am p litude derati
ng d
ue
to
fre-
q uencies above 70 MH
z
DC, Ca p acitive 200 V
Cou p led (AC
Co u pler I n stalled)
In put R and C
Resistance 1 ΜΩ with in 1°/ ο
Cap acita n ce
5 m V / d iv t h ru A pp roximately
5 .8 pF
50 mV / d iv
0 .1 V / d
iv t h ru Approximately 3 .4 pF
1 V /div
2 V /div t h ru Approximately
2 .0 pF
20 V /div
M aximum
Gate 0 .25
ηΑ or less at 25 ° C,
increasing
Cu r re
n
t
to
1 .2 ηΑ or less at 50 ° C
N oise
(Tange n tially
0 .1 d ivisio n (maximum),
measure d
measure d in FULL
in 7000-Se r ies Oscillosco
pe
M o d e)

1000 ν
200 ν
100
V
P ea k
V oltage
10 V
1 ν
Η ΙιΗ
ω
Γ ' ΙΙΙ

Ι Ι ~ Ι

111111

Ι Ι
Ffl
MEN
FTI
ι ~
Ι ~ o """" ~~~
m
/
Ι ~/ """" ~~~ // "
ιιι
_
" ΕΕΜ MS """" ==
E UMMS
MOMS so on
σ
F ig . 1-2 .
TA
BLE 1-1 (cont)
F re quency vers u s maxim u m i npu t am p lit ud ed erati
n g
grap
h .
Specification-7A11
2 ηΑ
1 .5 ηΑ
1 πΑ
..
Εd
~ κυ
Ύ
0 .25
ηΑ
0 .1
ηΑ
X
Π
ιι
20 0 C 30 0 C
40 0 C
50 0 C
60 0 C
Pr ob e Am b ie n t Te m pe r at ur e
F ig . 1-3 .

7A 11 m axi m um gate c ur rent vers u s P ro be a mb ie n t te m -
pe r atu r e i n "non-stored" m od e . To d ete rm i n e maxi mu m gate
cur-
re n t wit h P ro be store d , a dd +11 ° C to P ro b e am b ient temp er at ur e .
C h aracteristic P erformance Re q uirement
50
Ω
Te
r mi nation/
Ada p ter
In p ut Im p edance 50 Ω wit h i n 1%
P owerR ating 1 W att
ENV I R O NMEN
TA L
P ro b e
Temperatu r
e
Non-operating -55 ° C to
+75
° C
O perating 0 ° C to
+65
° C
Altit ude
Non-operating To 50,000 feet
Operating To 15,000 feet
V ibratio n 15 minutes alo n g eac h axis
at 0 .025
inc h Ρ - Ρ d is p laceme n t (3 .9 g's
at
55 c/s) 10 to 55 to 10 ε/s in

Specification -7 Α 11
F ig . 1-4 . Sta nd ing wave r atio g r a ph s h owi ng a pp roximate V S WR w h ic h can b e expecte
d w he n t h
e
7 Α 11 Pr
ob e is
u
se
d wit h t h
e 5092
Termination/Adapter attac h e d .