Tektronix 454A Operator's Handbook Manual

Tektronix
Marca
Tektronix
Modello
454A
Categoria
Misurazione, test
Tipo
Operator's Handbook Manual
Tektronix, Inc. • P.O. Box 500 • Beaverton, Oregon 97005
ERATO.RS
HA·ND8·'0;0
IC
o
This Operators Handbook supplements
the complete Instruction Manual
~ro"ided
,
. for this instrument. For more detailed infor-
mation,' refer to the Instruction Manual.
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.454A
OPERATO.S HANDBOOK
CONTENTS
Specifications
,.
Operating Instructions
Operating Voltage 5
Contro(s
and
Connectors 5
Simplified Operation Instructions 13
Users
Calibration 17
Copyright
® 1970 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.
®
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SPECIFICATIONS
The specifications given in this handbook
are
only
a
partial list condensed
from
the specifications listed
in
Sec-
tion
1
of
the Instruction Manual. These specifications most
directly reflect the capabilities
of
the 454A.
Characteristic
Performance
Characteristic Performance
Deflection Factor
Direct
or
with
P6054
2
mV/div
50
MHz, 7
ns
5
mV/div
100 MHz, 3.5
ns
10
mV/div
to
150 MHz, 2.4
ns
5
V/div
Deflection Factor
Channel 1
or
2,
or
Added Mode
Accuracy (With
or
without
P6054 Probe)
Maximum Risetime
and
Minimum
Bandwidth
at
Upper
-3
dB
Point AC (capac-
itive)
and
DC
(direct) Coupled,
Four-Division Ref-
erence, 25-0hm
Source Impedance
(OOC
to
+40°C)
®
.
VERTICAL
DEFLECTION
SYSTEM
Channel 1
and
2
Cascaded
using
..
With in
3%
of
indicated deflection
an
18-inch 50 rl
factor
with
GAl
N correctly
ad-
cable,
CH
1
and
justed
at20
mV/DIV'
t
CH
2
VOLTS/
DIV
set
to
2
mV/DIV,
unter-
minated, TR IG-
GER switch set
to
NORM.
Bandwidth at Lower
-3
dB Point, AC
(capacitive) Couple
Coupled
Common-Mode
Rejection Ratio AC
and
DC
Coupled
454A
33
MHz,
11
ns
10
Hz
or
less
( 1 Hz
with
P6054
probe),
At
least 20: 1 at 20 MHz.
1
2
Performance Characteristic
Characteristic
Performance
Delay Time
Jitter
Maximum
Safe
Input
One part
or
less,
in 20,000
of
lOX
Voltage the
TIME/DIV
setting.
All
V/DIV
Settings 500 volts
DC
+
peak
AC (one kilo-
Differential Time
Within
1.5%
and
4 minor
DE
LA
Y
hertz
or
less).
Measurement
TIME
MULTIPLIER
dial divisions
Accuracy
TRIGGERING
(A
AND
B SWEEP).
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_
HORIZONTAL
DEFLECTION SYSTEM
for
delay times
0.1
lls
to
50
ms.
Within 2.5%
and
4 minor
DELAY
TIME
MULTIPLIER
dial divisions
for
delay times
0.1
second
to 5
seconds.
Sweep
Accu racy
Over Center
8
Divisions
Unmagnified
Magl'lified
±3% ±4%
Mixed
Sweep
Within
2%
plus
measured
A
sweep
Accuracy error.
X-Y
OPERATION
Bandwidth
at
Upper
At
least 2 MHz.
-3
dB Point
DELAYED/MIXED
SWEEP
Phase
Shift
Between
3°
or
less
DC
to
2 MHz.
Calibrated Delay Time Continuous from 50
seconds
to
0.1
Channell
(X)
and
microsecond.
Channel 2 (Y)
Delay Time Accuracy
OoC
to
+40
0
C
Z
AXIS
INPUT
5 s/div
to
0.1
s/div
Within
2.5%
Sensitivity Five
volt
peak
to
peak
signal
pro-
50 ms/div to
Within
1.5%
duces noticeable modulation at nor-
0.1
lls/div
mal intensity.
454A
®
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Frequency
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Fig, 1. Trigger sensitivity
specification
limit
curve.
®
454A 3
Characteristic
Performance
Usable Frequency
Range
DC
to
50 megahertz.
CALIBRATOR
Accuracy
Voltage
Current
Repetition Rate
O°C
to
+40
o
C
1
volt
within
1%
5 rnA within
1%
1 kHz within
0.5%
Risetime
One
microsecond
or
less.
Duty Cycle
49%
to
51%.
Output
Resistance
250
n within 1
%.
Characteristic
Performance
Medium
,
104
to
126 volts.
High 112
to
136 volts.
230 Volts Nominal
Low
180
to
220 volts.
Medium
208
to
252 volts.
High
224
to
272 volts.
Line Frequency 48
to
62 Hz.
Maximum Power
,Consumption
116
watts
at
115 V, 60 Hz line.
CATHODE·RAY
TUBE (CRT)
POWER SUPPLY
Resolution
Voltage Range (AC,
RMS)
Geometry
115 Volts Nominal
Beam Finder
Low
90
to
110 voltS.
15 lines
or
greater in
one
division.
0.1
division
or
less.
Limits display within graticule area
when'
pressed.
4
454A
®
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OPERATING
INSTRUCTIONS
Operating Voltage
Before applying power
to
the instrument, check
that
the
indicating tabs
on
the switch bars
are
protruding through
~
the correct holes
for
the
desired nom inal line voltage and
regu
lating range.
This
instrument
is designed
for
operation
from
a
power
source
with
its
neutral
at
or
near earth
CONTROLS
AND
CONNECTORS
(ground)
potential
with
a separate safety-earth con-
Cathode-Ray Tube
ducter.
It
is
not
intended
for
operation
from
two
phases
of
a multiphase system,
or
across the
legs
of
a
FOCUS
Provides adjustment
for
optimum
single-phase three-wire system;
display
definition.
The
454A
can
be
operated
from
either a 115-volt
or
a
BANDWIDTH-BEAM
Three position switch which pro-
230-volt nomihal line voltage source. The
t Line Voltage
FINDER
vides bandwidth
limiting
and
beam
Selector assembly on the rear panel converts this instru-
location.
ment
from
one operating voltage
to
the other. This
assem-
bly also includes the fuses
that
provide protection
for
the
20
MHz: Vertical
Amplifier
band-
line-input
portion
of
the instrument.
To
convert
from
width
limited
to
provide a
re-
115-volt
to
230-volt
nominal lil'le voltage, or vice versa,
duction
in displayed
noise
or
in-
remove the cover
from
the Line Voltage Selector assembly.
terference.
Then, pull
out
the Selector switch
bar
and' plug
it
back
into
FU
LL:
Normal operation
with
full
the remaining holes. Change the
line"cordpower
plug
to
Ve
rtical
Amplifier
bandwidth
match the power-source receptacle
or
usea 115-
to
230-volt
capabilities.
adapter.
To
change regulating
ranges,
pull
out
the
Range
Selector switch bar, slide
it
to
the desired position and plug
BEAM
FINDER:
Compresses dis-
it
back in. Select a range which
is
centered about the aver-
play
within
graticule
a~ea,
inde-
age
line voltage
to
which the instrument
is
to
be
conn'ected.
pendently
of
display position
or
'Replace the cover and tighten the
two
captive screws.
applied signals.
®
454A
5
6
VOLTS/DIV
VARIABLE
UNCAL
STEP ATTEN BAL
Input Coupling
(AC·GND·DC)
Vertical (both channels
except'~s
noted)
GND: (Ground) Input circuit
is
grounded (does
not
ground ap-
plied signal).
Selects vertical deflection
factor
in
1-2-5 sequence (VAR lAB
LE
con-
trol
must
be
in
CALposition
for
indicated deflection factor).
Provides continuously
variC!ble
un-
c a Iibrated
deflection'
fa~t6rs
be-
tween
the
calibrated settings
of
the
VOLTS/DIV switch.
(Uncalibrated) Light indicates
that
the
VARIABLEcontrol.is
not
in
the
CAL positioh.
(Step
Attenuator
Balance) Screw-
driver
adjustment
to
balance
Input
Amplifier
in
the
2, 5
and
10
mV
positions
of
the
VOL
TS/DIV
switch.
Selects
method
of
coiJpling
input
signal
to
grid
of
Input
Amplifier.
AC:
DC
component
of
input
signal
is
blocked. Low frequency lim it
(-3
dB point)
is
about
10
hertz.
PROBE POWER
MODE
454A
DC: All
components
of
the
input
signal are passed
to
the
Inrut
Amplifier.
Power
source for active
probesys-
.'tems.
Selects vertical mode
of
operation.
CH
.1:
The
signal
connected
to
the
INPUT
CH
1
connector
is
dis-
played.
CH
2:
The
signal connected
to
the
INPUT
CH
2
connector
is
dis-
played.
AL
T:
(Alternate) Dual-trace display
of
'signals
at
both
channels. Dis-
play switched
at
end
of
each
sweep.
CHOP: Dual-trace display
of
signals
on
both
channels.
Display
switched between channels
at
a
repetition
rcite
of
about
one
megahertz.
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INT
TRIGGER
ADD
: Signals applied
to
the
IN
PUT
CH
.l and INPUT
CH
2
connec-
tors
are algebraically
added
and
the
algebraic sum is
displayed
on
the
CRT.
The
INVERT
switch
in
Channel 2 allows
the
display
to
be
CH
1 +
CH
2
or
CH
1 - CH
2.
(Internal Trigger)
Selects
source
of
internal triggering signal
from
verti-
cal system. Also selects
the
source
of
the
X signal for
X-V
mode
opera-
tion.
NORM: Sweep
circuits
triggered
from
displayed channel(s). Chan-
nel 1 signal available
at
CH 1
OUT
connector.
CH
1
ONLY
OR
X-V:
Sweep
cir-
cuits
triggered :only
from
the
sig-
nal
applied
to
the
INPUT
CH
1
connector.
No signal available
at
CH
1
OUT
connector.
CH
1
lights, located beside A
and
B
SOU RCE switches,
indicate
that
the
INT
TRIGGER
switch
is
in
the
CH
1
ONLY
ORX-Y
position.
454A
LEVEL
HF STAB (A Trigger-
ing Only)
SLOPE
For
X-V
mode
operation:
Chan-
nel 1 signal
isconmictedtQ'ithe
Horizontal
Amplifier. '
INVERT
(CH
2 only)
Inverts
the
Channel 2 display
when
pulled
out.
A and B Triggering (both where applicable)
Selects
amplitude
point
on
trigger
signal
at
which sweep is triggered.
(H
igh
Frequency
Stability)
De-
. creases display
jitter
for
trigger sig-
n~ls
above
about
40
megahertz. Has
negligible
effect
at
lower
repetition
rates.
Selects
slope
of
trigger signal
which
starts
the
sweep.
+: .
Sweep
can
be
triggered from
positive-going
portion
of
trigger
signal.
-:
Sweep
can
be triggered from
negative-going
portion
of
trigger
signal.
7
COUPLING
Determines method
of
coupling
trigger
signal
to
trigger circuit.
AC:
Rejects
DC
and
attenuates
sig-
nals
below about 30 hertz. Ac-
cepts
signals
between
about
30
hertz
and
150,megahertz.
System.
When
CH
1
light
is
"on,
trigger. signal
is
obtain~
only
from
the Channel 1
input
signal;
when the light
is
off,
the trigger
signal
is
obtained
from
the dis-
played
channel(s). Source
of
internal trigger
signal
is
selected
by
the TR IGGER switch.
LF
REJ: (Low Frequency Reject)
Rejects
DC
and attenuates
sig-
nals below about 50 kilohertz.
LI NE: Trigger
signal
obtained
from
a sample
of
the line voltage
ap-
plied
to
this instrument.
Accepts
signals
betWeen about
50 kilohertz
and
150 megahertz.
HF REJ:
(High
Frequenc!y Reject)
Accepts
signals
between about
30
hertz
and
50 ki lohertz;
re-
jects
DC
and attenuates signals
outside the above
range.
EXT:
Trigger
signal
obtained
from
an
external
signal
applied
to
the
EXT
TRIG
INPUT connector.
EXT
-:-
10: Attenuates external trig-
ger signals 10 times.
SOURCE
DC: Accepts all trigger signals
from
DC
to
150 megahertz
or
greater.
Selects source
of
trigger signal.
CH
1
Light
indicates
that
the intern,,1
trigger signal
is
obtained
only
from
the signal connected
to
the INPUT
CH
1 connector
(see
TR IGGE R
switch).
I
NT:
Internal trigger signal ob-
tained from VertiCal Deflection
EXT
TRIG
INPUT
I
nput
connector
for
external trigger
signal.
8
4~A
®
Aand
B Sweep
DELAY-TIME
MULTIPLIER
A
SWEEP
TRIG'D
UNCAL
A OR B
A
VARIABLE
B
SWEEP
MODE
®
LAY
TIME
(A-TIME/DIV)
switch
and
the
DELAY-TIME
Provides variable
sweep
delay
be-
MULTIPLlERdiaL
tween 0.10
and
10.10 times the
de-
lay time indicated by the A
TIME/
B STARTS
AFTER
DELAY
TIME:
.
DIV
switch.
B
sweep
circuit
runs immedi-
ately following delay time
selec-
Light
indicates th,at A
sweep
is
trig-
ted by the
DELAY
TIME
switch
gered
and
willproduce
a stable dis-
and
DELAY-TIME
MULTI"
play
with
correct
INTENSITY
'and
PLIER dial.
POSITION control settings.
HORIZ
DISPLAY
Selects horizontal mode
of
oper-
Light
indicates
that
either the A or
ation.
B
VARIABLE
control
is
not
in the
CA.L
position.
A:
Horizontal deflection provided
by A
sweep.
B
sweep
inoper-
Provides continuously variable A
ative.
sweep
rate
betWeen
the calibrated
settings selected.·.by the A
TIM
E/
A INTEN
DURING
B:
Sweep
rate
DIV
switch.
A'
sweep
rate
is
cali-
determined by A TIME/DI"'\1
brated when
control.
is
set
fully
switch.
An
intensified portion
clockwise
to
CAL.
appears
on the display during
the B
sweep
time. This switch
SelectsB
sweep
operation mode.
position provides a check
of
the
duration
and,
position
of
B
TRIGGERABLE
AFTER
DELAY
sweep
(delayed
sweep)
with
re-
TIME:
B
sweep
circuit
will
not
spect
to
the deiaying
sweep
(A).
produce a
sweep
until
a trigger
pulse
is
received
following the
B
(DELAYED
SWEEP):
Sweep
rate
delay time
se.lected
by the DE-
determined
by
B
TIME/DIV
454A
9
switch with the delay time deter-
mined
by
the setting of the
DELAY
TIME
(ATIME/DIV)
switch and the DELAY-TIM E
MULTIPLIER dial. Sweep mode
determined
by
B SWEEP MODE
·switch.
MIXED: First part of a horizontal
sweep displayed
at
a rate set by
the A TIME/DIV switch and
the
latter part of the sweep
at
a rate
set by the B
TIM
E/D
IV
switch.
Relative amounts of the display
allocated to each
svyee~
rate are
determ ined by the setting
of
the
DELAY-TIME
MULTIPLIER
dial.
X-V:
Permits
X-V
operation when
the
TRIGGER switch
is
set
to
CH
1 ONLY
OR.
X-V.
Signal
applied to the INPUT
CH
1
OR
X connector provides
the
X-axis
deflection, and the signal applied
to
the INPUT
CH
2
OR
Y con-
nector provides the Y-axis
de-
flection.
10
454A
MAG
A
SWEEP
MODE
(Magnifier) Increases sweep
rate
to
ten times setting of
the·
A or B
TIME/DIV switch by horizontally
expanding
the
center division of the
display. Light indicates when
mag-
nifier
is
on (magnifier inoperative
in
X-V
mode).
Determ ines the operating mode for
A sweep.
AUTO TRIG: (Automatic Trigger)
Sweep Initiated by the applied
trigger signal
at
point selected by
the
LEV E
L/S
LO
P E control
when
the
trigger signal repetition
rate
is
above about
30
hertz and
within the frequency range selec-
ted by
the
COUPLI
NG
switch.
Triggered sweep can
be
obtained
only over the amplitude range of
the
applied trigger signal. When
the
LEVEL/SLOPE control
is
outside
the
amplitude range,
the
trigger repetition rate
is
below
the
lower frequency limit (or
above upper limit for
AC
HF
®
12
TRACE ROTATION
CURRENT PROBE
CAL
CH
lOUT
B + GATE
A+
GATE
A
SWEEP
settings selected
by
the B
TIM
E/
DIV
switch. B
sweep
rate
is
cali-
brated when control
is
set fu
lIy
clockwise
to
CAL.
Screwdriver adjustment
to
align
trace
with
horizontal graticule lines.
Current
loop
providing
five-
mill
iampere square-wave current
from
calibrator circuit.
Output
connector
providing a
sample
of
the
signal
applied
to
the
INPUT
CH
1 connector
~hen
the
TRIGGER
switch
is
in the NORM
position.
Output
connector providing a
rec-
tangular 12.6
volt
pulse coincident
with
B
sweep.
Output
connector providing a
rec-
tangular 12.6
volt
pu
Ise
coincident
with
A Sweep.
Output
connector
providing a
sample (10 volts in amplitude)
of
X-GAIN (X-V)
ASTIG
Rear Panel
Z
AXIS
II\JPUT
Line Voltage Selector
454A
the sawtooth signal produced
by
the A Sweep Generator.
Screwdriver adjustment to calibrate
X-axis deflection in the X-V mode.
(Astigmatism) Screwdriver adjust-
ment
used
in conjunction
with
the
FOCUS control
to
obtain a well-
defined display.
Does
not
require
readjustment in normal
use.
Input
·connector
for
intensity mod-
ulation
of
the CRT display.
Switching assembly
to
select the
nominal operating voltage
and
the
line voltage
range.
The assembly
al-
so
includes the line fuses.
Voltage Selector: Selects nominal
operating voltage
range
(115 V
or
230
V).
Range
Selector: Selects line voltage
range (low, medium, high).
®
GENERAL
OPERATING
INFORMATION
6. Connect signal
to
vertical I
1\1
PUT connect?r.
Simplified Operating Instructions
7.
Advance
INTENSITY
control until display
is
visible
General. The following operating instructions Will allow
(if
display
is
not
visible
with
INTENSITY control at mid-
calibrated measurements in most applications. The operator
range,
press
BANDWIDTH-BEAM FINDER switch down
should
be
familiar
with
the complete function
and
oper-
and
adjust
VOL
TS/DIV
switch until display
is
reduced in
ation
of
the instrument
as
described in this section before
size
vertically; then center compressed display
with
vertical
using this procedure.
and
horizontal POSITION controls;
release
BANDWIDTH-
BEAM FINDER switch). Set FOCUS control
for
well-
defined display.
Normal Sweep Display
1.
Set
INTENSITY
control
fully
counterclockwise.
8. Set
VOL
TS/DIV
switch
and
vertical POSITION con-.
trol
for
display which remains
within
display
area
vertically.
2. Set
Input
Coupling switches
to
ACI;
VARIABLE
VOL
TS/DIV
controls
to
CAL
and
vertical MODE switch
to
CH
1
(use
AL
T or CHOP
for
dual-trace display).
9. Set A
LEVEL
control
for
stable display.
3.
Push
A
SWEEP
MODE, A SLOPE, A COUPLING, A
10. Set A
TIME/DIV
switch
and
horizontal POSITION
SOU
RCE
switches
to
up position.
control
for
display which remains
within
the display
area
horizontally.
4. Set A
TIME/DIV
switch
to
1 ms/DIV,
VARIABLE
TIME/DIV
controls
to
CAL
and
HORIZ
DISPLAY
switch
11.
To
make a
peak
to
peak measurement,
use
the fol-
toA.
lowing procedure:
5.
Set
POWER
switch
to
ON.
Allow
several
minutes
a.
Turn
the vertical POSITION control
so
the lower
warmup.
portion
of
the waveform coincides
with
one
of
the grati-
®
454A
13
14
cule lines below the center horizontal line,
and
the
top
of
the waveform
is
in the viewing
area.
Move the display
with
the horizontal POSITION control
so
one
of
the
peaks
lies near the center vertical graticule line.
b.
Measure the divisions
of
the vertical deflection
from peak
to
peak. Make
sure
the
VAR
VOL
TS/DIV
control
is
in the calibrated position.
12.
To
measure the
time
between
two
points on a
wave-
form,
use
the
following
procedure:
a.
Set the
TIME/DIV
switch
to
the fastest s'feep rate
that
displays
less
than eight divisions between the
time
measurement points.
b.
Adjust
the vertical POSITIOI\J control
to
move the
points, between which the time measurement
is
made,
to
the center horizontal graticule line.
c.
Adjust
the horizontal POSITIOI\J control
to
center
the display
within
the center eight divisions
of
the grati-
cule.
d. Measure the horizontal distance between the
time
measurement points.
Be
sure the A
VAR
control
is
set
to
the calibrated position.
e.
Multiply
the distance measured in step d by the
setting
of
the
TIME/DIV
switch.
Magnified
Sweep
Display
1.
Follow steps 1 - 10
for
normal
sweep.
2.
Adjust
horizontal POSITION control
to
move
area
to
be
magnified
within
center division
of
CRT.
If
necessary,
change
TIME/DIV
switch setting
so
complete
area
to
be
magnified
is
within
center division.
3.
Set MAG switch
to
X 10
and
adjust horizontal FIN E
control
for
precise positioning
of
magnified display.
Delayed
Sweep
Display
1.
Follow
steps 1 - 10
for
normal
sweep.
2. Set B SWEEP MODE switch
to
B STARTS
AFTER
DELAY
TIME,
HORIZ
DISPLAY
switch
to
A INTEN
DURING B and A SWEEP LENGTH control
to
FULL.
3.
Pull
out
DELAYED
SWEEP
(B
TIME/DIV)
switch
and
turn
clockwise
so
intensified zone on display
is
desired
454A
®
length (intensified zone
will
be
displayed in delay form),
If
intensified zone
is
not
visible,
change
INTENSITY control
setting.
4. Adjust
DELAY-TIME
MUL
TIPLI
ER
dial
to
position
intensified zone
to
portion
of
display
to
be
displayed.
5.
Set
HORIZ
DISPLAY
switch
to
B
(DELAYED
SWEEP).
Delayed
sweep
rate
is
shown
by
dot
on DE-
LAYED
SWEEP
switch.
6. For delayed display
with
less
jitter,
set
B
SWEEP
MODE switch
to
TRIGGERABLE
AFTER
DELAY
TIME,
all B Triggering switches up
and
adjust B
LEVEL
control
for
stable display.
Mixed Sweep Display
1.
Follow
steps
1 -
10
for
normal
sweep.
2.
Set the B
SWEEP
MODE switch
to
B STARTS
AFTER
DELAY
TIME,
HORIZ
DISPLAY switch to
MIXED
and
A
SWEEP
LENGTH
to
FULL.
®
454A
3.
Pullout
DELAYED
SWEEP
(B
TIME/DIV)
switch
and
turn clockwise
to
obtain the amount
of
magnification
desired.
4. Adjust
DELAY-TIME
MULTIPLIER
dial to vary the
amount
of
delay time before the start
of
the magnified
portion
of
the display.
5.
For mixed
sweep
display
with
less
jitter,
set B
SWEEP
MODE switch
to
TRIGGERABLE
AFTER
DELAY
TIME,
all B Triggering switches up,
and
adjust B
LEVEL
control
for
stable display.
x-v
Display
1.
Set
INTENSITYcontrol
fully
counterclockwise.
2.
Set
Input
Coupling switches
to
AC
and
VARIABLE
VOL
TS/DIV
controls
to
CAL.
3. Set TRIGGER switch
to
CH
1
ONLY
OR
X-Y
and
HORIZ DISPLAY switch
to
X-Yo
15
16
4. Set
POWER
switch
to
ON.
Allow
several
minutes
DIV
switches
until
display
is
reduced
in
size
both vertically
warmup.
and horizontally; then center compressed display
with
CH
1
.and
CH
2 POSITION controls;
release
BANDWIDTH·BEAM
FII\lDER switch). Set FOCUS
control
for
well-defined dis-
5. Connect X (horizontal). signal
to
II\lPUT
CH
1 or X
play.
connector
and
Y (vertical) signal
to
INPUT
CH
2 0 R Y
connector.
7. Set
CH
1
and
CH
2
VOLTS/DIV
switches
and
POSI-
6. Advance
INTENSITY
control
until
display
is
visible
TION
controls
for
display which remains
within
display
(if
display'
is
not
visible, 'press BANDWIDTH-BEAM
area.
CH
1 controls affect horizontal'deflection
and
CH
2
FINDER switch down
and
adjust
CH
1
and
CH
2
VOLTS/
controls affect vertical deflection.
454A ®
USER'S
CALIBRATION
General
The
following
procedure provides calibration infor-
mation
for
external adjustments
of
the 454A.
See
the com-
plete Instruction Manual
for
detailed calibration instruc-
tions.
Astigm~tism
Obtain a display
of
the calibrator waveform.
Adjust
ASTIG in conjunction
with
the FOCUS control for the best
definition
of
the square-wave display.
Trace Rotation
Obtain a free-running trace. Adjust TRACE
ROTATION
so
the trace aligns
with
the horizontal lines
of
the graticu
Ie.
Vertical Gain
Connect the 1
volt
calibrator
signal
to
the
input
connec-
tor
o.f
either vertical
input
channel. Set the vertical MODE
switch
to
display
that
channel and set
that
channel's deflec-
tion factor
to
.2 V/div. Adjust the front-panel
GAIN
adjust-
ment
of
the channel
for
exactly 5 divisions
of
deflection.
The best measurement accuracy when using probes
is
provided
if
the
GAIN
adjustment
is
made
with
the probes
installed.
®
454A
Step Attenuator Balance
Set both
Input
Coupling switches
to
GI\JD
and obtain a
free-running alternate dual-trace display.
Adjust
the STEP
ATTEN
BAL
control
in
each
input
channel
for
no trace
shift
when switching the appropriate attenuator switch
be-
tween the 2
mV
/div
and 10
mV
/div positions.
X Gain
(X-Y
Operation)
Set the
HORIZ
DISPLAY
switch
to
X-V and the
INT
TRIGGER switch
to
CH
1
ONLY.
Set the
CH
1 attenuator
switch
to
.2
V
/div
and the
CH
1 I
nput
Coupling switch
to
DC.
Apply
the 1
volt
calibrator signal
to
the
CH
1
Input
BNC
connector.
Adjust
the X GAII\J (X-Y) adjustment
for
exactly five divisions
of
horizontal deflection between the
displayed dots.
Horizontal Gain
Connect the calibrator signal
to
the
input
of
either verti-
cal
channel
and
set the vertical MODE switch
to
display this
channel. Set the HOR
IZ
DISPLAY
switch
to
display either
time
base.
Adjust
the appropriate triggering controls
for
a
triggered display at a
sweep
rate
of
one millisecond/
division. Check the display
for
one cycle
of
the calibrator
waveform
for
each
horizontal division.
For
more precise
timing measurements, refer
to
the calibration procedure
given in the Instruction Manual.
17
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Tektronix 454A Operator's Handbook Manual

Tektronix
Marca
Tektronix
Modello
454A
Categoria
Misurazione, test
Tipo
Operator's Handbook Manual
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