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Tektronix 7A18 User manual

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INSTRUCTION
MANUAL
7A18/7A18N
.
DUAL
..
TRACE
AMPLIFIER
Tekfronix,
Inc.
p,
0.
Box
500
•
Beaverton,
Oregon
97005
•
Phone
644·0161
•
Cables:
Tektronix
070-1126-01 1271
Scans
By
Artel
Media
Artek Media
1042 Plummer Gir.
SW
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www.artekmedia.com
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dpi unless the original manual had colored high lighting (as
is
the case for
some 70's vintage Tektronix manuals).
If you purchased this manual from us (typically through our Ebay name of
ArtekMedia) thank you very much. If you received this from a well-meaning
"friend" for free
we
would appreciate your treating this much like you would
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this manual. Donations via PayPal go to: manuals@artekmedia.com or can be
mailed to us the address above.
Dave &Lynn Henderson
Artek Media
"
All TEKTRONIX ,in$#uments are warranted against
defective materIals !ilfldworkmanship for one year. Any
questions withresp'eC't
to
the
warranty should be taken up
with
your
TE'KTRel'UXField
Engineer or representative.
~
0
x>"
,
,"
All
requests for"repai';s and replacement parts should be
directed
to
tbeTEKrRONJ~FieldOfficeor
representati
in
your
areai~~This
wilt'!'~~~~re
you
tti~';ii~stestPos'
•
service.
Pleas~:jnchlfle
tb~)ilfl~rument
Ty~.~~umber
or
Number and Serial
all
'Cop¥~~:'!®<~~;~,'~~~
material
1974,
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
permission of
Tektronix, Inc.
U.S.A. and foreign TEKTRONIX products covered by U.S.
and foreign patents
and/or
patents pending.
TEKTRONIX is a registered trademark
of
Tektronix, Inc.
7A18/7A18N
TABL.E
OF
CONTENTS
SECTION
1
SPECIFICATION
Introduction
Electrical
Characteristics
7A18
And
Mainframe
Frequency
Response
Environmental
Characteristics
Physical
Characteristics
SECTION
2
OPERATING
INSTRUCTIONS
Installation
Front
Panel
Controls
and
Connectors
General
Operating
Information
Basic
Applications
SECTION
3
CIRCUIT
DESCRIPTION
I
ntrod
uction
Block
Diagram
Description
Detailed
Circuit
Description
SECTION
4
MAINTENANCE
Preventive
Maintenance
T
rou
blesh
ooting
Replacement
Parts
Component
Replacement
SECTION
5
CALIBRATION
©I
Recalibration
Interval
Test
Equipment
Required
Part
I -
Performance
Check
Part
II
-
Adjustment
Page
1·1
1·1
1·3
1·3
1·3
2·1
2·1
2·2
2·4
3·1
3·1
3·1
4·1
4·1
4·3
4·4
5·1
5·1
5·3
5·7
OPTION
INFORMATION
SECTION
6
ELECTRICAL
PARTS
LIST
Abbreviations
and
Symbols
Parts
Ordering
Information
SECTION
7
DIAGRAMS
AND
CIRCUIT
BOARD
ILLUSTRATIONS
Symbols
and
Reference
Designators
Voltage
and
Waveform
Conditions
SECTION
8
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
ma-nual.
REV_
JUNE
1974
• -
1 to
•
=(@)
H'
,
•
•
~.~
I::"
•
~
-
CH'
~
,
•
•
_"",!"",o
'A"
-
CH'
=~
:J
...
~.
Fig. 1·1.
7A18
~nd
7A
1
8N
Amplifier.
-
--
@
7A18nAl~8N
____________________________________________________________________
____
______
__
__
7A1817A18N
SECTION
1
SPECIFICA
TION
Change
information,
if
any,
affecting
this
section
will
be
found
at
the rear
of
the manual.
Introduction
The
7A18
and
7A18N
Dual
Trace
Amplifier
plug-in
units
are
designed
for
use
with
Tektronix
7000-Series
Oscilloscopes.
The
7A18
and
7A18N
are
electrically
iden-
tical
except
that
readout
encod
ing
capab
ilities and
an
"IDENTIFY"
function
are
provided
only
in
the
7A18.
All
references
made
to
the
7A18
apply
equally
to
the
7A18N
unless
otherwise
noted.
The
7A 18
is
a
dual-channel,
medium-bandwidth
amplifier.
Internal
gain
and
compensa-
tion
circuits
are
automatically
switched
to
correspond
to
the
setting
of
the
VOL
TS/DIV
switch.
Channel
2
can
be
inverted
for
differential
measurements.
The
7A18
can
be
operated
in
any
plug-in
compartment
of
the
7000-Series
Oscilloscopes.
The
following
electrical
characteristics
are valid
over
the
stated
environmental
range
for
instruments
calibrated
at
an
ambient
temperature
of
+20°C
to
+30°C,
and
after
a five
minute
warmup
unless
otherwise
noted.
TABLE
1-1
ELECTRICAL
Characteristic
Performance
Requirement
Supplemental
Information
Deflection
Factor
Calibrated
Range
5
mV/Div
to
5
V/Div;
ten
steps
in
a 1,
2,5
sequence.
~~
f---~--
Deflection
Factor
Accuracy
Within
2%
with
GAIN
adjusted
at
10
mV/Div.
-------~~-------
--
Uncalibrated
Continuously
variable
between
calibrated
(VARIABLE)
steps;
extends
deflection
factor
to
at
least
12.5
V/Div.
-----~--------~~-
~~--------~---
..
-.-~----
.-
---------
1---
GAIN
Permits
adjustment
of
deflection
factor
for
calibrated
operation
with
all
7000-
series
oscilloscopes.
~~----~
..
---------.------~-----
-~--
"._--"
---
...
_--------
-.-
------~----~
f------------.-~-----
Frequency
Response
System
Dependent
(8
div
reference
signal)
Upper
Bandwidth
DC (Direct)
Coupled
See
Table
A
-~--.---
~--
Lower
Bandwidth
10
Hertz
or
less
AC (Capacitive)
Coupled
--------
With lOX
Probe
1
Hertz
or
less
----
©
1-1
Specification-7A
18/7
A18N
TABLE
1-1
(cont)
Characteristic Performance Requirement Supplemental Information
-
Maximum
Input
Voltage
DC
Coupled
250
volts,
(DC + Peak
AC);
AC
com-
ponent
500
volts
peak-to-peak
maxi-
mum,
one
kilohertz
or
less.
AC
Coupled
500
volts, (DC + Peak
AC);
AC
compo-
nent
500
volts
peak-to-peak
maxi-
mum,
one
kilohertz
or
less.
Channel
I
solation
50:
1
display
ratio
up
to
50
megahertz.
Input
Rand
C
Resistance
1
Mn
± 2%
Capacitance
Approximately
20_0
pf
RC
Product
Within
±1%
between
all
deflection
factors.
Displayed
Noise
(Tangentially
Measured)
300
microvolts
or
less
at
5
mV
/Div in
7000-Series
Oscilloscope_
Overdrive
Recovery
Time
0.1 ms
or
less
to
recover
to
within
one
division
after
the
removal
of
an over-
drive signal
of
up
to
+
75
divisions
or
-75
divisions regardless
of
overdrive
signal
duration.
Common
Mode
Rejection
At
least
10:1
up
to
50
megahertz_
Ratio
DC
Drift
Drift
with
Time
(ambient
0_02 division
or
less in
anyone
minute,
temperature
and
line
voltage
after
one
hour
warmup.
constant)
Drift
with
Temperature
No
more
than
0.01 division
per
degree
C.
(line
voltage
constant)
Time
Delay
between
Channels
700
picoseconds
or
less_
Display
Modes
Channell
only_
Dual-trace,
alternate
between
channels.
Added
algebraically.
Dual-trace
chopped
between
channels_
Channel
2
only.
1-2 @
Specification-7
A
18/7
A18N
TABLE
1-1
(cont)
----.--.----.-.-.----.-.------.-.--
..
----.~~-.----.-.----;---.-.-
....
----.--~.---.------.---~-.-~--~-
Characteristic
Trigger source Selection
Performance Requirement
Channell
only.
Follows DISPLAY MODE selection.
Channel 2 only
TABLE A
7A18
AND MAINFRAME
FREQUENCY RESPONSE
Supplemental Information
.~
__
W_;th7:7:::::,~~J_~_~~h6:5::::'"
-_1
__
With 7400 Series
50
MHz
TABLE 1-2
ENVIRONMENTAL CHARACTERISTIC
Refer
to
the Specification for the associated oscilloscope.
TABLE 1-3
PHYSICAL
__
:_i:_~_9_h_t
~~~--_-
- -
t:
:'::~~~~~'~:~:::'~:~""
--
-----~-----------
© 1-3
NOTES
-----------.------------~----------------------------------------
.-
...
----~.--------
--------------------------------------
--~-.-
..-
..•.
-.....
----
..
~~~~~~-
-------------------------------
--.--------------.--~~~~-
-
7A18
/
7A18N
SECTION
2
OPERA
TING
INSTRUCTIONS
Change
information,
if
any, affecting this section
will
be
found
at
the rear
of
the manual.
General
To
effectively
use
the
7A
18, the operation and capabili·
ties
of
the instrument must be
known.
Thi
s section
des·
cribes front·panel co
ntrol
functions,
ge
neral
information
on
signal
input
connections,
an
d
other
su
bjects that pertain
to
va
rious measurement application
s.
Installation
The
7A
18
is
calibrated and ready
for
use
as
received.
It
ca
n
be
installed
in
any compartment
of
T
ektron
ix
7000
·
Ser
ies oscilloscopes,
but
is
intended for principal use in
vertical plug·in compar
tment
s.
To
install,
al
i
gn
the upper
and lower rails
of
the 7A18
with
the oscilloscope tracks and
fully insert
it.
The
front
will
be flush
with
the
front
of
the
oscilloscope when the
7A
18 is
fully
inserted, and the latch
at the
bottom
·l
eft
corner
of
the
7A
18
will
be in place
aga
inst the
front
panel.
To
remove the 7A 18,
pull
on the latch (which
is
inscribed
with
the
unit
identification
"7
A
18"
or
"7
A1
8N")
and the 7A 18
wi
ll
un
latch.
Continue
pulling
on the latch to
slide the 7A 18
out
of
the oscilloscope.
FRONT PANEL CONTROLS
AND
CONNECTORS
The
following
descriptions apply
to
the
controls
and
connectors
of
both
Input
Amplifier
channels when appli·
cable.
See
Fig. 2·
1.
Input
Connector
AC·GND·DC
@
Provides sign
al
connection to t
he
channel.
Selects signal
input
coupling
mode.
AC-The AC component
of
the si
g·
n
al
is
coupled to the amplifier
input
whi
le the DC
component
is blocked.
GND
-Grounds the
amplifier
input
while
maintaining the
same
load
for
the
input
signal.
Pr
ovides a
charge path
for
the
AC
coupli
ng
capacitor to precharge t
he
input
circu
i t before switching the
input
to
AC.
eM2
...ot..AR11"Y
••
u.
J:!
,.....,
-
........
~H2
~.
DUAl
T1lAC£ AMf"UFtEfII
F;9. 2·1.
Front
·punel co
ntr
ols lind
co
nn
&<:lors.
17A 18
snown
.)
POSITION
IDENTIFY
(7
A 18 o
nly
)
DC
-80
th
AC
and
DC
components
of
the signal are coupled to the
amplifier
input.
Controls
positio
n
of
the trace. Posi-
tioning
of
the tra
ce
in
the
"ADD"
Display Mode
is
co
ntr
olled by
CH
1
POSITION
control
only.
Deflects trace about 0
.2
division
for
trace id
entification.
In instruments
wi
th readout, also replaces readout
w
it
h the
word
"IDENTIFY".
2·'