Tektron 453A Service manual

OPERATORS
HANDBOOK
This Operators Handbook supplements
the complete Instruction Mariual provided
for this instrument. For more detailed infor-
mati;n, refer to the Instruction Manual.
Tektronix, Inc. •P.O. Box
500 •Beaverton, Oregon 97005
453A
OSCll:LOSCOPE
.r

453A OPERATORS HANDBOOK
CONTENTS
Specification
Operating Instructions
Operating Voltage
Controls and Connectors
Simplified Operation Instructions
Users Calibration
1
5
5
13
17
070·1105-00
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

General
SPECIFICATIONS
Characteristic Performance
VERTICAL DEFLECTION SYSTEM
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 453A.
Characteristic Performance
AC Low-Frequency
Response (lower
-3 dB point)
Without probe
With P6061 Probe
1.6 hertz
or less at all deflection
factors.
0.16 hertz
or less at all deflection
factor~.
Deflection Accuracy Within 3% of indicated deflection.
Cascaded deflection factor uncali-
brated.
Maximum Safe
Input
Voltage
600 vorts DC +peak AC (one kilo-
hertz
or less).
Internal Trigger
Sensitivity
Bandwidth
at -3 dB
points (with or
without P6061
Probe)
20 mV to 10
VOLTS!DIV
10 mV!DIV
5mV!DIV
Channels 1and 2
cascaded
@I
DC to at least 60 megahertz.
DC to at least 50 megahertz.
DC to at least 40 megahertz.
DC to at least 25 megahertz.
453A
AC
LF REJ
TRIGGERING
(A AND BSWEEP)
0.3 division of deflection, mini-
mum, 30 hertz to 10 megahertz; in-
creasing to one division at 60 mega-
hertz.
0.3 division
of deflection, mini-
mum,
30 kilohertz to 10 mega-
hertz; increasing
to one division at
60 megahertz.
1

HORIZONTAL DEFLECTION SYSTEM
A and B Sweep Generator
50 ms to 1lls/DIV Within 1.5% of indicated delay.
Sweep Accuracy Unmagnified Magnified
Over
Center Eight f-------+-------
Divisions (DoC to Within 3% Within 4%
+40
0
C)
Performance
Less than 1 part in 20,000 of the
maximum available delay time (10
times ATIME/DIV switch setting).
Continuous from 50 seconds to 0.2
microsecond.
Within 2% ±measured Asweep
error when viewing A portion only.
B portion accuracy is same as stated
under Sweep Accuracy.
Within 2.5%
of indicated delay.
Mixed and Delayed Sweep
Characteristic ,
Mixed Sweep
Accuracy
Calibrated Delay
Range
Delay
Time Jitter
Delay Accuracy Over
Center Eight Divi-
sions
(DoC to
+40
0C)
5 s to 0.1 siDIV
Characteristic Performance
HF REJ
0.3 division of
deflection,
..
mInI-
mum, 30 hertz to 50 kilohertz.
DC
0.3
division of deflection, mini-
mum, DC to 10 megahertz; increas-
ing
to one division at 60 megahertz.
External Trigger
Sensitivity
AC
50 millivolts, minimum, 30 hertz to
10 megahertz; increasi
ng
to 200
millivolts at 60 megahertz.
LF REJ
50
millivolts, minimum,
30 kilo-
hertz
to 10 megahertz; increasing to
200 millivolts at 60 megahertz.
HF REJ
50 millivolts, minimum, 30 hertz to
50 kilohertz.
DC
50 millivolts, minimum, DC to 10
megahertz; increasing to 200 milli-
volts
at 60 megahertz.
2
453A
®

Characteristic IPerformance Characteristic Performance
Phase difference be-
3° or less at 50 kilohertz.
tween Xand Y
amplifiers
External Horizontal Amplifier
Input
to CH 1OR X
Connector
Accuracy
(DoC to Within 5% of indicated deflection.
+40
0
C)
XBandwidth at Five megahertz or greater.
Upper
-3 dB
Point
Accuracy
(DoC to
+40
0
C)
Voltage
Current
CALIBRATOR
±1%
±1%
Phase difference
3° or less at 50 kilohertz.
between Xand
Yamplifiers
Input
to EXT TRIG
OR XINPUT
Connector
Deflection
Factor BSOU RCE switch in EXT; 270
milllivolts/division ±15%.
BSOU RCE switch
in EXT ..;- 10;
2.7 volts/division ±20%.
XBandwidth
at Five megahertz or greater.
Upper
-3 dB
point
Repetition Rate ±0.5%
Risetime One microsecond
or less.
Output Resistance Approximately 200 ohms in V
position.
Approximately 20 ohms in 0.1 V
position.
ZAXIS INPUT
Sensitivity Five volt peak-to-peak signal pro-
duces noticeable modulation
at nor-
mal intensity.
Usable Frequency
DC to 50 megahertz or greater.
Range
®
453A
3

Characteristic ]Performance Characteristic Performance
Line Voltage
POWER SUPPLY
115 volts nominal or 230 volts
nominal.
23O-volts nominal 180
to 220 volts
208 to 252 volts
224
to 272 volts
Voltage Ranges (AC,
RMS)
115-volts nominal 90 to 110 volts
104
to 126 volts
112 to 136 volts
4
Line Frequency
Maximum Power
Consumption
453A
48 to 62 hertz
92 watts, one ampere
at 60 hertz,
115-volt line
®

OPERATING INSTRUCTIONS
CONTROLS AND CONNECTORS
age line voltage to which the instrument is to be connected.
Replace
the cover and tighten the two captive screws.
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
regulating range.
Vertical (both channels except as noted)
VOLTS/DIV Selects vertical deflection factor
(VAR control
must be in calibrated
position for indicated deflection
factor).
OPERATING VOLTAGE
~~
This instrument is designed for operation from a
power source with its neutral at or near earth
(ground)
potential with aseparate safety-earth con-
ductor.
It is not intended for operation from two
phases of amultiphase system, or across the legs of a
single-phase three-wire system.
The 453A can be operated from either a115-volt or a
230-volt nominal line voltage source.
The Line Voltage
Selector assembly on
the rear panel converts this instru-
ment from one operating voltage to the other. This
assembly also includes
the fuses that provide protection for
the line-input portion of the instrument. To convert from
115-volt to 230-volt nominal line voltage,
or vice versa,
remove
the cover from the Line Voltage Selector assembly.
Then, pull
out the Selector switch bar and plug it back into
the remaining holes. Change the line-cord power plug to
match the power-source receptacle or use a115- to 230-volt
adapter.
To change regulating ranges, pull out the Range
Selector switch bar, slide
it to the desired position and plug
it back in. Select arange which
is centered about the aver-
Display
INTENSITY
FOCUS
BEAM FINDER
Controls brightness
of display.
Provides
adjustment for well-defined
display.
Compresses display with
in graticule
area,
independent of display posi-
tion
or applied signals.
®
453A 5

STEP ATTEN BAL
Vertical (cont)
VAR
UNCAL
POSITION
GAIN
Input Coupling
(AC-GND-DC)
(Variable) Provides continuously
variable deflection factors between
the calibrated settings of the
VOL TS/DIV switch.
(Uncalibrated) Light indicates
that
the VAR control is not in the cali-
brated position.
Controls vertical position of trace.
Screwdriver
adjustment to set gain
of the Vertical System.
Selects
method of coupling input
signal to Vertical Deflection Sys-
tem.
AC: DC component of input signal
is blocked. Low frequency limit
(-3 dB point) is about 1.6 hertz.
GND: (Ground) Input circuit is
grounded (does not ground
applied signal).
DC: All components of the input
signal are passed to the Vertical
Deflection
System.
CH 1OR X and
CH 2OR Y
MODE
(Step Attenuator Balance) Screw-
driver
adjustment to balance Input
Amplifier in the 5, 10, and 20 mV
positions of the VOL TS/DIV
switch.
I nput connector for vertical signal.
Selects vertical
mode of operation.
CH 1: The Channel 1signal is dis-
played.
CH 2: The Channel 2signal is dis-
played.
AL T: (Alternate) Dual-trace display
of signal on both channels. Dis-
play switched
between channels
at end of each sweep.
CHOP:
(Chopped) Dual-trace dis-
play
of signal on both channels.
Display switched between chan-
nels at a repetition rate of about
500 kilohertz.
6 453A
®

Aand BTriggering (both where applicable)
LEVEL Selects amplitude point on trigger
signal
at which sweep is triggered.
CH 1OR X·Y: Sweep circuits trig-
gered only from the signal
applied
to the CH 1OR X con·
nector. No signal available at CH
lOUT connector. CH 1lights,
located beside A
and BSOU RCE
switches, indicate
that the I NT
TRIG switch is in the CH 1 OR
X·Y position. For X·Y mode
operation, Channel 1signal is
con nected to the Horizontal COUPLI NG
Amplifier.
INTTRIG
ADD: Channell and 2signals are
algebraically added and the alge·
braic sum is displayed on the
CRT.
(Internal Trigger) Selects source
of
internal trigger signal from vertical
system. Also selects
the source of
the Xsignal for X-Y mode oper·
ation.
NORM: Sweep circuits triggered
from displayed channel(s). Chan-
nel 1signal available
at CH 1
OUT connector.
INVERT
(CH 2only)
HF STAB
(A
Triggering Only)
SLOPE
Inverts
the Channel 2display when
pulled
out.
(H igh Frequency Stability) De·
creases display jitter for high·
frequency trigger signals. Has negli·
gible 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.
Determines method of coupling
trigger signal
to trigger circuit.
® 453A
7

Aand BTriggering (cant)
AC: Rejects DC and attenuates sig-
nals below about 30 hertz. Ac-
cepts signals between about 30
hertz and 60 megahertz.
LF REJ: (Low Frequency Reject)
Rejects
DC and attenuates sig-
nals below about 30 kilohertz.
Accepts signals between
about
30 kilohertz and 60 megahertz.
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 INT TRIG switch.
LINE: Trigger signal
obtained from
asample
of the line voltage ap-
plied
to this instrument.
EXT: Trigger signal
obtained from
an external signal applied
to the
EXT TRIG INPUT connector.
SOURCE
HF REJ: (High Frequency Reject)
Accepts signals between
about
30 hertz and 50 kilohertz; re-
jects DC and attenuates signals
outside
the above range.
CH 1
DC: Accepts all trigger signals from
DC to 60 megahertz or greater.
Selects source
of trigger signal.
INT: Internal trigger signal ob- EXT TRIG INPUT
tained from Vertical Deflection
System. When CH 1light is on,
trigger signal
is obtained only
from
the Channel 1 input signal;
EXT
-;- 10: Attenuates external trig-
ger signals approximately 10
times.
Light indicates
that the internal
trigger signal
is obtained only from
the signal connected to the CH 1
OR X
connector (see INT TRIG
switch).
Input connector for external trigger
signal.
Connector for BTriggering
also serves as external horizontal in-
put for the Xsignal when HO RIZ
DISPLAY switch
is in X-Y position
8 ~A
®

A and B Sweep
DELAY-TIME
MULTIPLIER
ASWEEP TRIG'D
UNCAL A OR B
A
and B TIME/DIV
and DELAY TIME
®
and BSOURCE switch is in EXT
position.
Provides variable sweep delay be-
tween 0.20 and 10.20 times the de-
lay time indicated by the ATI M E/
DIV switch.
Light indicates that A sweep is trig-
gered
and will produce a stable dis-
play with correct INTENSITY and
POSITION control settings.
(Uncalibrated) Light indicates that
either the AVAR or B VARIABLE
control is not in the calibrated posi-
tion.
A TIME/DIV switch (clear plastic
flange) selects the sweep rate of the
A sweep circuit for A sweep only
operation and selects the basic de-
lay time (to be multiplied by
DELAY-TIME MULTIPLIER dial
setting) for delayed or mixed sweep
operation. B TIME/DIV (DE-
LAYED SWEEP) switch selects
453A
AVAR
BSWEEP MODE
sweep rate of Bsweep circuit for
delayed or mixed sweep operation
only. Variable controls must be in
calibrated positions for calibrated
sweep rates.
(Variable) Provides
continuously
variable A sweep rate between the
calibrated settings selected by the A
TIME/DIV switch. A sweep rate is
calibrated when control is set fully
clockwise to cal ibrated.
Selects B sweep operation mode.
TRIGGERABLE AFTER DELAY
TIME: B sweep circuit will not
produce a sweep until atrigger
pulse
is received following the
delay time selected by the DE-
LAY TIME (A TIME/DIV)
switch and the DELAY-TIME
MULTIPLIER dial.
B
STARTS AFTER DELAY TIME:
B sweep circuit runs immedi-
ately following delay time selec-
ted by the DELAY TIME switch
9

A and B Sweep (cant)
determined by 8SWEEP MODE
switch.
HORIZ DISPLAY
10
and DELAY-TIME MULTI-
PLI ER dial.
Selects
horizontal mode of opera-
tion.
A: Horizontal deflection provided
by Asweep. 8
sweepinoper-
ative.
AINTEN DURING
8: Sweep rate
determined by A TIME/DIV
switch. An intensified portion
appears on the display during
the 8sweep time. This switch
position provides a
check of the
duration and position of 8
sweep (delayed sweep) with
re-
spect to the delaying sweep (A).
8(DELAYED SWEEP):
Sweep rate
determined by 8TIME/DIV
switch
with the delay time deter-
mined
by the setting of the DE-
LAY TIME (A TIME/DIV)
switch and the DELAY-TIME
MULTIPLIER dial.
Sweep mode
MAG
ASWEEP MODE
453A
MIXED: 80th time bases are oper-
ating.
The sweep rate of the first
part of the sweep is determined
by the A TIME/DIV switch; the
last part is determined by the 8
TIME/DIV switch.
The amount
of display allocated to each time
base is determined by the setting
of the DELAY-TIME MULTI-
PLIER dial.
X-Y: Horizontal
deflection pro-
vided
by an external signal.
(Magnifier) Increases sweep
rate to
ten times setting of the A or 8
TIME/DIV switch by horizontally
expanding the center division of the
display. Light indicates when mag-
nifier
is on (magnifier inoperative in
X-Y mode).
Determines the operating mode for
Asweep.
®
'1<
i
1

®
AUTO TRIG: (Automatic Trigger)
Sweep Initiated by the applied
trigger signal
at point selected by
the ALEVEL control when the
trigger signal repetition rate is
above about 20 hertz and within
the frequency range selected by
the A COUPLING switch. Trig-
gered sweep can
be obtained
only over the amplitude range of
the applied trigger signal. When
the ALEVEL control is outside
the amplitude range, the trigger
repetition rate is below the
lower frequency limit (or above
upper limit for HF REJ), or the
trigger signal is inadequate, the
sweep free runs at the sweep rate
selected by the TIME!DIV
switch to produce a bright refer-
ence trace.
NORM TRIG: (Normal Trigger)
Sweep initiated by the applied
trigger signal at point selected by
the A LEVEL control over the
frequency range selected by the
ACOUPLING switch. Triggered
sweep can be obtained only over
the amplitude range of the
453A
RESET
ASWEEP LENGTH
applied trigger signal. When
the
ALEVEL control is outside the
amplitude range, the trigger
repetition rate is outside the fre-
quency range selected by the A
COUPLING switch, or the trig-
ger signal
is inadequate, there is
no trace.
SINGLE SWEEP: After asweep is
displayed, further sweeps cannot
be presented until the RESET
button is pressed. Display is trig-
gered as
for NORM operation
using the ATriggering controls.
When the RESET button is pressed
(SINGLE SWEEP
mode), asingle
display will
be presented (with cor-
rect triggering) when the next trig-
ger pulse
is received. RESET light
(inside
RESET button) remains on
until atrigger is received and the
sweep is completed. RESET button
must be pressed again before an-
other sweep can be displayed.
Adjusts length of Asweep. In the
FU LL position (clockwise detent),
11

A and B Sweep (cant)
Switch: Controls power to the
instrument.
POSITION
FINE
1 kHz CAL
POWER ON
12
the sweep is at least 10 divisions
long. As
this control is rotated
counterclockwise, the length of A
sweep
is reduced until it is less than
four divisions long just before the
detent in the fully-counterclock-
wise position is reached. In the B
ENDS Aposition
(counterclock-
wise detent). the A sweep is reset at
the end of the Bsweep to provide
the fastest possible sweep repetition
rate for delayed sweep displays.
Controls horizontal position of
trace.
Provides more precise horizontal
position adjustment.
(One-kilohertz calibrator) Cali-
brator output connector.
Light: Indicates that POWER
switch
is on and the instrument
is connected to aline voltage
source.
Side Panel
ASTIG
BTIME!DIV
VARIABLE
PROBE LOOP
AGATE
B GATE
453A
(Astigmatism) Screwdriver adjust-
ment used in conjunction with the
FOCUS control to obtain awell-
defined display. Does not require
re-adjustment in normal use.
Provides
continuously variable B
sweep rate between the calibrated
settings of the B TIME!DIV switch.
B sweep rate is cal ibrated when
control is set fully clockwise to
CAL.
Current loop providing five-
mill i ampere square-wave current
from calibrator circuit.
Output connector providing arec-
tangular 12 volt pulse coincident
with A Sweep.
Output connector providing arec-
tangular 12 volt pu Ise coincident
with B Sweep.
®

CH lOUT (Channell Output) Output connec-
tor providing asample of the signal
applied
to the CH 1OR Xconnec-
tor when the INT TRIG switch is in
the
NORM position.
CALIBRATOR Switch selects output voltage of
Calibrator. One-volt and O.l-volt
square wave available.
TRACE ROTATION Screwdriver adjustment to align
trace
with horizontal graticule lines.
Rear Panel
Z AXIS INPUT I nput connector for intensity mod-
ulation of the CRT display.
Line Voltage Selector Switching assembly
to select the
nominal operating voltage and the
line voltage range. The assembly
also 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
Simplified Operating Instructions
General. The following operating instructions will allow
calibrated measurements in most applications. The operator
should be familiar with the complete function and oper-
ation of the instrument as described in the complete 453A
I nstruction Manual before using this procedure.
Normal Sweep Display
1. Set I NTENSITY control fully counterclockwise.
2. Set Input Coupling switches to AC, VAR VOLTS/
DIV controls to calibrated, and vertical MODE switch to
CH 1 (use AL Tor CHOP for dual-trace display).
3.
Push ASWEEP MODE, ASLOPE, A COUPLING, and
ASOURCE switches to the up position.
4. Set A
TIME/DIV switch to 1 ms/DIV, A VAR control
to calibrated and HORIZ DISPLAY switch to A.
5. Set POWER switch to ON. Allow several minutes
warmup.
®453A 13

6. Connect signal to the CH 1 OR X connector.
7. Advance INTENSITY control until display is visible
(if display
is not visible with INTENSITY control at mid-
range, press BEAM
FINDER switch and adjust VOL TS/DIV
switch until display is reduced in size vertically; then center
compressed display with vertical and horizontal POSITION
controls; release BEAM FINDER switch). Set FOCUS con-
trol
for well-defined display.
8. Set VOL TS/DIV switch and vertical POSITION con-
trol for display which remains within display area vertically.
9. Set ALEVEL control for stable display.
10. Set A TIME/DIV switch and horizontal POSITION
control for display which remains within the display area
horizontally.
11. To make a peak-to-peak voltage measurement, use
the following procedure:
a. Turn the vertical POSITION control so the lower
portion of the waveform coincides with one of the grati-
cule lines below the center horizontal line, and the top
of the waveform is within the viewing area. Move the
display with the horizontal POSITION control so one of
the peaks lies near the center vertical line.
b. Measure
the divisions of 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 awave-
form, use the following procedure:
a. Set the A TIME/DIV switch to the fastest sweep
rate that displays less than eight divisions between the
time measurement points.
b. Adjust the vertical POSITION control to move the
points, between which the time measurement is made, to
the center horizontal graticule line.
c.
Adjust the horizontal POSITION 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 V AR control is set to
the calibrated position.
e. Multiply the distance measured in step d by the
setting of the TIME/DIV switch.
14
453A
®

Magnified Sweep Display
1. Follow steps 1 - 10 for Normal Sweep Display.
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 Display.
2.
Set B SWEEP MODE switch to BSTARTS 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
length (intensified zone
will be displayed in delayed form).
If intensified zone is not visible, change INTENSITY con-
trol setting.
4. Adjust
DELAY-TIME MULTIPLIER dial to position
intensified zone
to portion of display to be delayed.
5. Set
HORIZ DISPLAY switch to B (DELAYED
SWEEP). Delayed sweep rate is shown by dot on DE-
LAYED SWEEP (B TIME/DIV) switch.
6.
For delayed display with less jitter, set B SWEEP
MODE switch to TRIGGERABLE AFTER DELAY TIME,
all BTriggering switches up, and adjust B LEVEL control
for stable display.
Mixed Sweep Display
1. Follow steps 1 - 10 for Normal Sweep Display.
2. Set the B
SWEEP MODE switch to BSTARTS
AFTER DELAY TIME, HORIZ DISPLAY switch to
MIXED, and A SWEEP LENGTH to FULL.
3. Pull out DELAYED SWEEP (B TIME/DIV) switch
and turn clockwise to obtain the amount of magnification
desired.
®
453A
15

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 BTriggering switches up, and adjust B LEV EL control
for stable display.
X-Y Display
1. Set INTENSITY control fully counterclockwise.
2.
Set both Input Coupling switches to AC and VAR
VO L TS/DIV controls to calibrated.
3. Set
INT TRIG switch to CH 1OR X-Y and HORIZ
DISPLAY switch to X-Yo
4. Set POWER switch to ON. Allow several minutes
warmup.
5. Connect X(horizontal) signal
to CH 1 OR Xconnec-
tor and Y(vertical) signal to CH 2OR Yconnector.
6. Advance INTENSITY control until display is visible
(if display is not visible, press BEAM FINDER switch and
adjust
CH 1and CH 2 VOL TS/DIV switches until display is
reduced in size both vertically and horizontally; then center
compressed display
with CH 1 and CH 2POSITION con-
trols;
release BEAM FINDER switch). Set FOCUS control
for well-defined display.
7. Set
CH 1 and CH 2VOLTS/DIV switches and POSI-
TION controls for display which remains within display
area. CH 1controls affect horizontal deflection and CH 2
controls affect vertical deflection.
16 453A

USER'S CALIBRATION
General
The following procedure provides calibration infor-
mation for external adjustments of the 453A. See the com-
plete Instruction Manual for detailed calibration instruc-
tions.
Astigmatism
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 graticule.
Vertical Gain
Connect the .1 volt calibrator signal to the input connec-
tor of either vertical input channel. Set the vertical MODE
switch to display that channel and set that channel's deflec-
tion factor to 20 mV/DIV. Adjust the front-panel GAIN
adjustment of the channel for exactly 5divisions of deflec-
tion.
The best measurement accuracy when using probes is
provided if the GAl N adjustment is made with the probes
installed. Connect the one-volt calibrator signal to the
probe tip.
Step Attenuator Balance
Set both Input Coupling switches to GND 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
between the 5, 10, and 20 mV/div positions.
XGain Check (X- YOperation)
Set the HORIZ DISPLAY switch to X-Y and the INT
TRIG switch to CH 1 OR X-Yo Set the CH 1 attenuator
switch to 20 mV/div and the CH 1 Input Coupling switch
to DC. Apply the .1 volt calibrator signal to the CH 1 OR X
connector. Check for exactly five divisions of horizontal
deflection between the displayed dots.
®
453A
17

Timing Check
Connect the calibrator signal to the input of either verti-
cal channel and
set the vertical MODE switch to display this
channel. Set the HORIZ 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 complete cycle of the
calibrator waveform for each horizontal division. For more
precise
timing check, refer to the calibration procedure
given in the complete I nstruction Manual.
18
453A
®