manuals.online logo
Brands
  1. Home
  2. •
  3. Brands
  4. •
  5. Tektronix
  6. •
  7. Amplifier
  8. •
  9. Tektronix 7A12 User manual

Tektronix 7A12 User manual

Other Tektronix Amplifier manuals

Tektronix 7a15 User manual

Tektronix

Tektronix 7a15 User manual

Tektronix 7a11 User manual

Tektronix

Tektronix 7a11 User manual

Tektronix 7a15 User manual

Tektronix

Tektronix 7a15 User manual

Tektronix AM 502 User manual

Tektronix

Tektronix AM 502 User manual

Tektronix 7A16P User manual

Tektronix

Tektronix 7A16P User manual

Tektronix 11A52 Owner's manual

Tektronix

Tektronix 11A52 Owner's manual

Tektronix 5A26 User manual

Tektronix

Tektronix 5A26 User manual

Tektronix 2A63 Product guide

Tektronix

Tektronix 2A63 Product guide

Tektronix 7A19 User manual

Tektronix

Tektronix 7A19 User manual

Tektronix 7A24 User manual

Tektronix

Tektronix 7A24 User manual

Tektronix 7A19 User manual

Tektronix

Tektronix 7A19 User manual

Tektronix 7A26 User manual

Tektronix

Tektronix 7A26 User manual

Tektronix 7A18 User manual

Tektronix

Tektronix 7A18 User manual

Tektronix 2A61 User manual

Tektronix

Tektronix 2A61 User manual

Tektronix 7K11 User manual

Tektronix

Tektronix 7K11 User manual

Tektronix TYPE L User manual

Tektronix

Tektronix TYPE L User manual

Tektronix 11A71 User manual

Tektronix

Tektronix 11A71 User manual

Tektronix 50 User manual

Tektronix

Tektronix 50 User manual

Tektronix 7A29 User manual

Tektronix

Tektronix 7A29 User manual

Tektronix 59 Product guide

Tektronix

Tektronix 59 Product guide

Tektronix 7A16P User manual

Tektronix

Tektronix 7A16P User manual

Tektronix 11A32 Assembly instructions

Tektronix

Tektronix 11A32 Assembly instructions

Tektronix 7A14 User manual

Tektronix

Tektronix 7A14 User manual

Tektronix P6046 User manual

Tektronix

Tektronix P6046 User manual

Popular Amplifier manuals by other brands

Magnat Audio EDITION FOUR Owner's manual/warranty document

Magnat Audio

Magnat Audio EDITION FOUR Owner's manual/warranty document

Inter-m PA-2000A Operation manual

Inter-m

Inter-m PA-2000A Operation manual

Yamaha TX6n owner's manual

Yamaha

Yamaha TX6n owner's manual

Peavey TNT 150 user guide

Peavey

Peavey TNT 150 user guide

Bosch LBB 1903/10 Installation and user instructions

Bosch

Bosch LBB 1903/10 Installation and user instructions

Avocent Emerge DA1200D Installer/user guide

Avocent

Avocent Emerge DA1200D Installer/user guide

Redgum RGi35 operating instructions

Redgum

Redgum RGi35 operating instructions

Cambridge Audio AXA25 user manual

Cambridge Audio

Cambridge Audio AXA25 user manual

Alpine MRP-M200 owner's manual

Alpine

Alpine MRP-M200 owner's manual

Technical Pro H1502UrBT user manual

Technical Pro

Technical Pro H1502UrBT user manual

FMS EMGZ307 operating manual

FMS

FMS EMGZ307 operating manual

Racal Instruments 5601 user manual

Racal Instruments

Racal Instruments 5601 user manual

Valcom V-1094A Technical specifications

Valcom

Valcom V-1094A Technical specifications

Cambridge Audio 851D user manual

Cambridge Audio

Cambridge Audio 851D user manual

QSC 3800 Specifications

QSC

QSC 3800 Specifications

NAD C300 owner's manual

NAD

NAD C300 owner's manual

Rotel RMB-1077 owner's manual

Rotel

Rotel RMB-1077 owner's manual

Peavey Monitor 300 Series operating guide

Peavey

Peavey Monitor 300 Series operating guide

manuals.online logo
manuals.online logoBrands
  • About & Mission
  • Contact us
  • Privacy Policy
  • Terms and Conditions

Copyright 2025 Manuals.Online. All Rights Reserved.

1
N
ST
FR
U
GTI
O
N
MAN
VAL
.
Serial

Number
J~
l
)
V
~
1
'~Cr
7A
12
DUAL
TRACE
AMPLIFIER
Tektronix,
Inc
.
0
P
.
O
.
Box
500
"
Beaverton,
Oregon97005 "
Phone
644-0161
"
Cables
:
Tektronix
070-0977-01

971
WARRANTY
All
Tektronix
instruments
are
warranted
against
defective materials
and
workmanship
for
one
year
.
Any
questions
with
respect
to the
warranty,
mentioned
above,
should
he
taken
up
with your
Tektronix
Field
Engineer
or
representative
.
All
requests
for
repairs
and
replacement
parts
should
he 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
(or
Part
Number)
and
Serial
or
Model
Number
with
all
requests
for
parts
or
service
.
Specifications
and
price
change
privileges
reserved
.
Copyright
©
1971 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
the
copyright
owner
.
U
.S
.A
.
and
foreign
Tektronix
products
covered
by U
.S
.
and
foreign
patents
and/or
patents
pending
.
TABLE
OF
CONTENTS
7A12
SECTION
1
SPECIFICATION
Page
SECTION
5
CALIBRATION
Page
Introduction
1-1
Introduction
5-1
Electrical
Characteristics
1-1
Test
Equipment
Required
5-1
Environmental
Characteristics
1-3
Performance
Check
5-3
Physical
Characteristics
1-3
Adjustment
5-7
SECTION2
OPERATING
INSTRUCTIONS
General
2-1
SECTION
6
ELECTRICAL
PARTS
LIST
Front
Panel
Controls
and
Connectors
2-1
Abbreviations
and
Symbols
General
Operating
Information
2-3
Parts
Ordering Information
Basic
Applications
2-5
Index
of
Electrical
Parts
List
SECTION
3
CIRCUIT
DESCRIPTION
Introduction
3-1
SECTION
7
DIAGRAMS
AND
CIRCUIT
BOARD
Block
Diagram
3-1
ILLUSTRATIONS
Detailed
Circuit
Description
3-1
SECTION
4
MAINTENANCE
SECTION
8
MECHANICAL
PARTS
LIST
Introduction
41
Mechanical
Parts
List
Information
Preventive
Maintenance
41
Index of
Mechanical
Parts
Illustrations
Troubleshooting
41
Mechanical
Parts
List
Corrective
Maintenance
44
Accessories
Fig
.
1-1
.
7A12
Dual
Trace
Amplifier
.
Introduction
The
7A12
vertical
amplifier
plug-in
is
designed
for use
with
Tektronix
7000-Series
Oscilloscopes
.
The
7A12
is
a
dual-channel,
wide
band
amplifier
with
the
upper
frequency
limit
mainly
determined
by
the
oscilloscope
mainframe
in
which
it is
used
.
For
example,
the
7A12
used with
the
7504
oscilloscope
will
have
an
upper
bandwidth
limit
of
about
75
MHz
.
When
used with
a
7704
oscilloscope,
the
upper band-
width
limit
is
about
105
MHz
. .
Internal
gain
and
compen-
sation
circuits
are
auotmatically
switched
to
correspond
to
the
setting
of
the
VOLTS/DIV
switch
.
A
+UP/INV
switch
for
each
channel
allows
either
channel
to
be
inverted
for
differential
measurements
.
The
7A12
features
a
DC
offset
circuit
with
a
DC
offset
of
at least
±500
divisions
for
SECTION
1
SPECIFICATION
TABLE
1-1
ELECTRICAL
7A12
viewing
low
level
AC
signals
in
the
presence
of
a
high-level
DC
component
.
This
instrument
will
meet
the
electrical
characteristics
listed
in
Table
1-1
following
complete
calibration
as
given
in
Section
5
.
The
performance
check procedure
given
in
Section
5
provides
a
convenient
method
of
checking
instru-
ment
performance
withoutmaking
internal
adjustments
.
The
following
electrical
characteristics
are
valid
over
the
stated
environmental
range
for
instruments
calibrated
at
an
ambient
temperature
of
+20
°
C
to
+30
°
C,
after
a
five
minute
warmup
unless
otherwise
stated
.
Characteristic
Performance
Requirement
Supplemental
Information
Deflection
Factor
Calibrated
Range
5
mV/div
to
5
V/div,
10
pushbuttons
in
a
I,
2,
5
sequence
Deflection
Factor
Within
2%
with
GAIN
adjustment
at
10
Accuracy
mV/div
Uncalibrated
Continuously
variable
;
VAR
V/DIV
extends
deflection factor
to
at
least
12
.5
V/div
+UP
to
.
INVERT
Gain
Ratio
1
:1
within
1%
Frequency
Response See Table
A
AC
(Capacitive)
10
Hz
or
less
without
probe,
1
Hz
or
less
Coupled
Input
Lower
with
P6053
Bandwidth
Frequency
Time
Delay
Between
Channels
500
ps or
less
Channel
Isolation
At
least
3000
:1
or
0
.3
div
with
5
div
reference
signal
at
75
MHz
.
At
least
100
:1
with
equal
deflection
factors
at
50
MHz
or
less
Specification-7A12
TABLE
1-1
(cont)
Characteristic
Performance
Requirement
Supplemental
Information
Maximum
Input
Voltage
DC
Direct
Couple
5
mV/div
&
350
V,
DC
or
DC
+
Peak
AC
at
1
kHz
or
10
mV/div
less
20
mV/div
to
500
V,
DC
or
DC
+
Peak
AC
at
1
kHz
or
5
V/div
less
AC
(Capacitive)
Coupled
Input
5
mV/div
&
350
V,
DC
or
DC
+
Peak
AC
at
1
kHz
or
10
mV/div
less
20
mV/div
to
5
V/div
500
V,
DC
or
DC
+
Peak
AC
Input
R
and
C
Resistance
1
Megohm
±2%
Capacitance
Approximately
24
.0
pF
R
and
C
Product
Within
±1%
between
all
deflection
factors
Recommended
X10
Probe
P6053,
6ft
Maximum
Input
Gate
0
.4
nA
at
0
to
+35
°
C2
nA
at
+35
°
C
to
Current
+50
°
C
IDENTIFY
Trace
deflects
up
0
.2
div
to
0
.4
div
Display
Noise
250
pV
at
5
mV/div
.
0
.1
div
or
less
at
(Tangentially
Measured)
other
deflection
factors
Chopped
Mode
(when
installed
in vertical
compartment
.
Mainframe
dependent
.)
Repetition
Rate
500kHz
within
20%
Channel
Time
Segment
0
.8
ps to
1
.2
ps
DC
Drift
Drift
With
Ambient
100
pV/
°
C
or
0
.01
div/
°
C
whichever
is
Temperature
(Line
greater
Voltage
Constant)
DC
OFFSET
Range
At
least
+1000
div
to
-1000
-
div
at
5
mV/div
At
least
+500
div
to
-500
div
from
10
mV/div
to
5
V/div
Common
Mode
Rejection
Ratio
At
least
10
:1
at
40
MHz
or
less
scope
.
TABLE
A
7A12
AND
MAINFRAME
FREQUENCY
RESPONSE
(five
division reference)
With
7900
Series

With
7700
Series

With
7500
Series

With
7400
Series
120
MHz

105
MHz

I

75
MHz

I

55
MHz
TABLE
1-2

TABLE
1-3
ENVIRONMENTAL

PHYSICAL
Specification-7A12
Refer

to

the

Specification

for
the

associated

oscillo-

Size

Fits
all
7000-Series
Plug-in
Compartments
Weight

I

2
.8
Ibs
(1
.3
kg)
General
SECTION
2
OPERATING
INSTRUCTIONS
To
effectively
use the
7A12,
the
operation
and
capa-
bilities
of
the
instrument
must
be
know
.
This
section
de-
scribes
front-panel
control
functions,
general
information
on
signal
input
connections,
and
other
subjects
that
pertain
to
various
measurement
applications
.
Installation
The
7A12
is
calibrated
and
ready
for use
as
received
.
It
can
be
installed
in
any
compartment
of
Tektronix
7000-
Series
Oscilloscopes,
but
is
intended
for
principal
use
in
vertical
plug-in
compartments
.
To
install,
align
the
upper
and lower
rails
of
the
7A12
with
the
oscilloscope
tracks
and
insert
it
.
The
front
panel
will
be
flush
with
the
front
of
the
oscilloscope
when
the
7A12
is
fully
inserted,
and
the
latch
at
the
bottom-left
corner
of
the
7A12
will
be
in
place
against
the
front panel
.
To
remove
the
7A12,
pull
on the
latch
(which
is
in-
scribed
with
the
unit
indentification
"7A12")
and
the
7A12
will
unlatch
.
Continue
pulling
on
the
latch
to
slide
the
7A12
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

Provides
signal
connection
to
the
channel
.
AC-GND-DC-

Four
position
pushbutton
switch
DC
&
OFFSET

selects
signal
input
coupling
mode
.
AC-The
AC
component
of
the
signal
is
coupled
to
the
amplifier
input while
the
DC
component
is
blocked
.
DC-Both
AC
and
DC
components
of
the
signal
are
coupled
to
the
amplifier
input
.
POSITION
IDENTIFY
VOLTS/D
I
V
Pushbuttons
VAR
V/DIV
+UP/INV
Pushbuttons
7A12
GND-Grounds
the
amplifier
input
while
maintaining
the
same
load
for the
input
signal
.
Provides
a
charge
path
for the
AC
coupling
capacitor
to
precharge
the
input
circuit
before
switching
the
input
to
AC
.
DC
&
OFFSET-Direct
couples
the
signal
to
the
amplifier
and
pro-
vides
DC
offset
of
at least
±
500
divisions
(±
1000
divisions
at
5
mV/Div)
.
Controls
vertical
position of
the
trace
.
Deflects
trace
up
about
0
.3
div
for
trace
identification
.
Also
replaces
readout
with
the
word
"IDENTIFY"
when
used
with
oscilloscopes
equipped
with
a
read-
out
system
.
Volts
per
major
graticule
division
.
Selects
calibrated
deflection
factors
from
5
mV/Div
to
5
V/Div
;
10
steps
in
a
1-2-5
sequence
.
Provides
continuously
variable
un-
calibrated
deflection factor
settings
between
calibrated steps
.
Extends
deflection factor
range
to
at least
12
.5
volts/division
.
Provides
means
of
inverting
the
display
.
+UP-A
positive-going
signal at
the
input
deflects
the
CRT
display
upward
.
INV-A
positive-going
signal at
the
input
deflects
the
CRT
display
downward
.
Operating
Instructions-7A12
2
.
2
nld
rwmDe
x0n
cx
Fig
.
2-1
.Front-Panel Controls
=uConnectors
.
OFFSET
TRIGGER
SOURCE
Pushbuttons
Variable
control permits
on-screen
display
of
small
signal
variations
superimposed
upon
relatively
large
DC
levels
.
DISPLAY
MODE

Pushbutton

selection

of

the
Pushbuttons

following
modes
of
operation
:
CH
1-A
single
trace
display
of
the
signal
applied
to
Channel
1
input
connector
.
ALT-A
dual
trace
display
of
the
signals
applied
to
both
channels
.
The
channels
are
alternately
dis-
played
and
switching occurs
at
the
end
of
each
sweep
.
ADD-Algebraically
adds
the
signals
applied
to
the
CH
1
and
CH
2
input
connectors
and
the
algebraic
sum
is
displayed
on
the
CRT
.
CHOP-A
dual
trace
display
of
the
signal
applied
to
both
channels
.
The
two
channels
time-share
the
sweep
at
a
rate
determined by
the
main-
frame
.
An
output
signal
is
provided
for
trace
blanking
during the
channel
switching
interval
.
Selects
source
of
trigger
signal
.
The
trigger signals
provide
internal
trig-
gering
for
the
oscilloscope
time-
base
.
CH
1-Internal
triggering
signal
ob-
tained
from
signal
applied
to
Channel
1
Input
connector
.
Mode-(Center
pushbutton)
in-
ternal
trigger
automatically follows
DISPLAY
MODE
selection
.
In
ADD
or
CHOP
display
modes,
the
trigger
signal
is
the
algebraic
sum
of
CH
1
and
CH
2
trigger
.
CH
2-Internal
trigger
signal
ob-
tained
from
signal
applied
to
Channel
2
Input
connector
.
Operating
Instructions-7A12
GENERAL
OPERATINGINFORMATION
Introduction
For
single
trace
operation,
either
of
the
two
identical
amplifier
channels
can
be
used
independently
by
setting
the
DISPLAY
MODE
and
TRIGGER
SOURCE
switches to
CH
1
or
CH
2
and
connecting
the
signal
to
be
observed
to
the
appropriate
input
.
In
the
discussions
to
follow,
single-trace
operation
using
CH
1
applies
equally
to
CH
2
.
Signal
Connections
In
general
probes
offer
the
most
convenient
means
of
connecting
a
signal
to
the
input
of
the
7A12
.
A
X10
atten-
uator
probe
offers
a
high
input
impedance
and
allows
the
circuit
under
test
to
perform
very
close
to
operating
con-
ditions
.
The
Tektronix
P6053
6
foot
probe,
with
its
readout-coding
ring,
is
designed
specifically
for use
with
the
Tektronix
7A
series vertical
amplifiers
.
The
readout coding
ring
on
the
probe
connects
to
a
circuit
in
the
7A12
which
automatically
corrects
the
readout
displayed
on
the
CRT
to
the
actual
deflection
factor
at
the
tip
of
the probe
.
The
Tektronix
P6053
3
.5
foot
probe
is
not
recommended
be-
cause
it
may
compromise
the
aberration
limits
of
this
am-
plifier
.
Vertical
GainAdjustment
To
check
the
gain of
either
channel,
set
the
VOLTS/D
IV
switch
to
10
mV
and
connect
a
40
mV,
1
kHz
signal
from
the
oscilloscope
calibrator
to
the
Input
connector of
the
channel
being
checked
.
The
vertical
deflection
should
be
exactly
four
divisions
.
If
not, adjust
the
front-panel
GAIN
for
exactly
four
divisions
of
deflection
.
Both
channels
should
be
checked
and
adjusted,
if
necessary,
before
making measurements
.
If
the
gain
of
the
two
channels
must
be
closely
matched
(as
in
differential
measurements
using
the
ADD
MODE),
use
the
adjustment
procedure
in
Section
5
.
Input
Coupling
NOTE
The
Channel
1
and Channel 2
Input
Coupling
switches
allow
a
choice
of
input
coupling
methods
.
The
type
of
display
desired
and the
applied
signal will
determine
the
coupling
to
use
.
The
DC
coupling
position
can be
used
for
most
appli-
cations
.
It
must
be
used
to
display
AC
signals
below
about
30
hertz
(10
hertz
with
a
X10
probe)
and
squarewaves
with
low
frequency
components,
as
these
signals
will
be
atten-
uated
in
the
AC
position
.
2-
3