Tektronix 454A Service 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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070-1106-00
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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.
® 1170
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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 ..
Within
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, TRIG-
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).
-T-r-ig-ge-r-s-e-n-si-ti-V-ity--I~s_e_e_F_i_9.~1_. _
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 Accuracy
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 +400 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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Vertical :=::: 1=+=+=I+l+1r:r-:==+:::J=4=+:q:m=+:;:;:;::+=Um Signal applied to J
deflect,ion ~ 1-+-+-I-+++lIf----f-l----f-+-1-t+H+:'-:;-,.I' 1--+-+--H+++t'---.,.-H"--t-'-H+t+HI--'I I EXT TRIG INPUT
(divisions) ~J \ DC, AC, ~:i'~i:tl~:)
~ t:.:t::t:I:l:Wtt:=t::t=t:4::t:ttm=:( I-''-:+--o++-I-H+f----'-+-+-f---,-f-+-H-f-+'I---J ,~,-+-+-H~-++---1-+-+-+-+lI-+t+__f1I.1'r- LF R EJ
f-- ,rlf-+-ir+I+t+---+--+-++t+H+-WiI-If-;-1H-t++I
1.5 i=:::=; 375
f--
1.4 f--
I-------l
I-------l
f------'
I--- f-+_H+++Hr---+-t-'-+-+-l-+lH+t----i \-HH--t+Ht-+-lI-+-H+++H--; r--+-+--+-+-+t-t+---+---f---f-l-t+1H1--H-HH-++++1
1.2 ~ J=t:1~~m:~~=t::t:Uttl+=~ 300
~ f-+-+-IH-lI-+tt--+-+-+-+-t+++l.t---1 \-+-I-+-+t-++I-+-t--t-t-1-H~I-~ l--+-+-++-t+/t---1---+-+-Hf+alR-I----f-+--IH-+-++t:H
::::J 'i=~:tI:Wt=:t:t=t::ttttw~=4 t--+-+-+++t-t+--++--t-iH-t-H-H---{
1.0 - ~+-+-+-1-I+t+-""";'-+--+-+-+-lII-Il-++-HI-+-+-i-+-t+i-I
-
- (:: 0 Verification
Points
- F---,
0.8 - -----' ~
-
l-
Typical -3 dB Points
0
------j
)-
-----'
0.6 B l=EE]:m~:EE:EE~WE8l=~' k:+=t:t:Wet==t::t:=t:::t:tttttt:::) I-+-H+t+HI--+--I*f ·-+-t+1f++---IH-HH--t++-H
t-+-+-+-H
AC
& HF REJ ~f-+++-f-+'I-----l ~'--'~""LF REJ ++--+--1-t-++HF REJ
~
I---
'r-t-H+t+HI-' ... .... ... 'rl-t--+-+-t-t+1l-tb" ....... ~y
•
•
• ~I--I--+4+-1-+t-+t---n·-+-+-I-H-'lcH"
0.4 f--
o
o
o
...
o 0:
......
0
...
if
lit
if
a: a:
":
0 0:
0-
0
0
if if if if
•
iii
f--
..... '
'
0.3 ~
f--
0.2 t--
I---
1----1
1----1
I---
o ~
n
Frequency
"
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 +40oC
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 nwithin 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 110voltS.
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 nominal 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.
LINE: 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 kilohertz; 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 IGGER
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 AOR 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 10.10times 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
determined 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).
Determines 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 PE 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
®

REJ) or the trigger signal is in- RESET
adequate,
the sweep free ru ns at
the sweep rate selected by the
TIME/DIV switch to produce a
reference trace.
NORM
TRIG: (Normal Trigger)
Sweep initiated
by the applied A SWEEP LENGTH
trigger signal
at any point selec-
ted by the LEVEL/SLOPE con-
trol over
the frequency range
selected by the COUPLlI\JG
switch. Triggered sweep
can be
obtained only over
the ampli-
tude range of the.applied trigger
signal. When
the LEVEL/SLOPE
control
is outside the amplitude
range, the trigger repetition rate
is outside the frequency range
selected by the COUPLING
switch,
or the trigger signal is in-
adequate,
there is no trace.
1 V CAL 1kHz
SINGLE SWEEP:
After a sweep is
displayed, further sweeps cannot
be presented until the RESET Side
Panel
button is pressed. Display is trig-
gered
as for NORM operation
B TIME/DIV
using
the A Triggering controls.
VARIABLE
®
454A
When
the RESET button is pressed
(SINGLE SWEEP mode), a single
display will be presented (with cor-
rect triggering). After the sweep is
completed, the RESET button
must be pressed again before an-
other sweep can be displayed.
Adjusts length of A sweep. In the
FU LL position (clockwise detent),
the sweep is about 11 divisions
long. As
th is control is rotated
counterclockwise, the length of A
sweep
is reduced u ntH it is less than
four divisions long just before the
detent in the fully-counterclock-
wise position
is reached. In the B
ENDS A position (counterclock-
wise
detent), the A sweep is reset at
the end of the B sweep to provide
the fastest possible sweep repetition
rate for delayed sweep signals.
Calibrator output connector.
Provides continuously variable B
sweep rate between
the calibrated
11

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 X10 and adjust horizontal FINE
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