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 ®