Tektronix 524AD series User manual

CATHODE-RAY OSCILLOSCOPE
TYPE S24AD
INSTRUCTION
MANUAL
TEKTRONIX, INC.
MANUFACTURERS OF CATHODE-RAY AND VIDEO TEST INSTRUMENTS
Sunset Highway and Barnes Road • P. 0, Box 831 • Portland 7, Oregon, U.S. A.
Phone: CYpress 2-2611 • Cables: Tektronix
TYPE 524AD SERIAL NUMBER ---

TYPE S24AO CATHOOE-tAY OSClllOSCOPf
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B

GENERAL DESCRIPTION
General
The 'fektronix Type 524AD is a portable, self-
contained cathode-ray oscilloscope specifically
designed for maintenance and adjustment of tele-
vision
transmitters and studio equipment.
With this oscilloscope, any portion of the tele-
vision picture can be observed, from complete
frames to small portions of individual lines. Any
one of the 525 lines in the picture can be select-
ed
and observed in detail. Internally-generated
time markers facilitate sync-pulse timing. The
wide-band vertical amplifier is provided with a
network that can be switched in to limit the
high-frequency response to that recommended
by the IRE Standards Committee for stand-
ardized pulse-level measurements. A second
switch position adds high-frequency compensa-
tion to make flat frequency response to 5 me,
within one per cent, but at the sacrifice of best
transient response.
The vertical amplifier has a bandwidth to
10 megacycles, a de sensitivity to 0.15 volts per
centimeter, and an ac sensitivity increased by a
lOX ac-coupled
preamplifier to 0.015 volts per
centimeter. A built-in variable-duty-cycle cali-
brator aids in pulse-level measurements.
The sweep system provides calibrated sweeps
as fast as 0.1 microsecond per centimeter, in-
cludes a
3X and lOX magnifier, a television
composite-video-signal
sync separator, and a
variable
delayed sweep. The unblanking pulse is
de coupled.
Characteristics
SWEEP CIRCUIT
Hard-tube type, triggered or recurrent opera-
tion as desired.
SWEEP-TIME RANGE
Continuously variable, 0.1 microsecond per
centimeter to 0.01 second per centimeter.
TRIGGER REQUIREMENTS
TV composite video signal between 0.5 volt
and 15 volt peak, or pulses 0.15 to 15 volts peak
to peak.
SWEEP MAGNIFICATION
Magnifier expands the trace to right and left
of center, either 3X or lOX. Magnified sweep
speed limited to 0.1 microsecond per centimeter.
EXTERNAL SWEEP INPUT
External sweep voltage can be coupled in via
100-k
potentiometer through de-coupled sweep
amplifier, with magnification, if desired. Hori-
zontal positioning included.
SINE-WAVE, 60-CYCLE PHASED SWEEP
This sine-wave sweep is adjustable in ampli-
tude and the phase can be varied through 150
degrees. Applied via the sweep amplifier. In-
cludes sweep-magnifier and horizontal-position-
ing circuits.
TIME MARKERS
Five time intervals are provided of 1 µsec,
0.1 µsec, 0.05 µsec, 0.318 µsec and 1.59 µsec. (200
markers and 40 markers per television line.)
DC UNBLANKING
The de-coupled unblanking pulse permits the
slowest sweeps to be used with uniform spot
intensity throughout the sweep.
VERTICAL AMPLIFIER
Four de-coupled stages provide sensitivities
from 0.15 volts per centimeter. Output stage
is a three-section push-pull distributed amplifier.
An ac-coupled lOX preamplifier can be switched
in for highest sensitivity, giving a sensitivity of
0.015 volts per centimeter.
AC VERTICAL-DEFLECTION SENSITIVITY
Continuously variable from 0.015 volts per
centimeter to 50 volts per centimeter, peak to
peak.
DC VERTICAL-DEFLECTION SENSITIVITY
Continuously variable from 0.15 volts per
centimeter to 50 volts per centimeter, peak to
peak.
VERTICAL-AMPLIFIER FREQUENCY RESPONSE
DC to 10 megacycles at a maximum sensitivity
of 0.15 volts per centimeter. Two cycles to
10 megacycles with the ac-coupled preamplifier
for sensitivity increased to 0.015 volts per centi-
meter.
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GENERAL DESCRIPTION - PAGE 1
TYPE 624AD

Over-compensation of high frequencies can be
selected
with a switch to provide flat frequency
response, within I per cent, to 5 me, bnt with
some overshoot on transient response.
VERTICAL-AMPLIFIER TRANSIF.NT RESPONSE
Rise time 0.04 microseconds between response
points 10 per cent and 90 per cent of the final
value.
VERTICAL-AMPLIFIER INPUT IMPEDANCE
One megohm shunted by 45 µµf capacitance.
PROBE INPUT IMPEDANCE
Ten megohms shunted by 15 µµf; !OX attenua-
tion.
SIGNAL-DELAY NETWORK
A <lelay network supplies an additional
0.25 microsecond of delay to the vertical-ampli-
fier system to permit the triggering waveform
to he displayed. Total signal delay is 0.34 micro-
seconds.
CALIBRATOR
A variable-duty-cycle square wave is provided.
Seven full-scale ranges between 0.05 volts and
SO volts, continuously variable, can be read di-
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rcctly from the dial settings with an accuracy
within three per cent of full scale. The duty
cycle is variable between I per cent and 99 per
cent. Frequency varies with duty cycle.
CATHODE-RAY TUBE
A type 5ABP1 cathode-ray tube is supplied
with the Type 524AD unless a P7 or a Pll is
specified
as the optional choice.
CATJIODE-RAY Tum; ACCELERATING VOLTAGE
Four kilovolts. (-+·2.5 and -1.5 kv.)
CONSTRUCTION
Welded aluminum alloy, with photo-etched
panel and blue wrinkle case.
DIMENSIONS
25" long, 13" wide, 16¼" high.
\VEIGHT
61 pounds.
POWER REQUIREMENTS
105 to 125 volts or 210 to 250 volts ac, SO to
60 cycles. 500 watts at 117 or 234 volts.
TYPE 524AD
GENERAL DESCRIPTION- PAGE 2 ®

VOLTS/CM
INPUT
SELECTOR
INPUT 1,
INPUT 2
GND
VARIABLE
ATTEN.
CAL. VOLT-
AGE RANGE
VARIABLE
ATTEN. BAL.
CAL.DUTY
CYCLE
CAL.
VOLTAGE
CAL.OUTPUT
PROBE
POWER
SCALE
ILLUMINA-
TION
FOCUS
INTENSITY
ASTIGMATISM
VERTICAL
POSITION
®
Front-Panel Controls and Connectors
VERTICAL AMPLIFIER
Seven-position gang switch. Selects attenuators or preamplifier at the input to
the vertical amplifier to select vertical-deflection sensitivity.
Six-position
switch connects INPUT 1, INPUT 2, or the calibrator output to the
vertical amplifier, and inserts or removes a capacitor for ac or de coupling.
Coaxial connectors to the vertical-amplifier system via the INPUT SELECTOR
switch.
Binding post connected to the instrument case.
Variable resistor between cathodes of the cathode-coupled variable-gain stage.
Varying this resistor varies the coupling between stages and varies the overall
stage gain.
Eight-position switch selects attenuators providing seven calibrator voltage
ranges, and turns the calibrator off.
Adjusts grid bias of vertical variable-gain stage. When the two cathodes of this
cathode-coupled stage are at equal voltage, no vertical positioning occurs when
the VARIABLE ATTEN. control is adjusted.
Variable resistor adjusting time constants of calibrator multivibrator. Time con-
stant of one-half of multivibrator is lengthened while time constant of other is
shortened. Permits duty cycle to be varied between one per cent and 99 per cent
limits.
Calibrated potentiometer across the CAL VOLTAGE RANGE step-attenuator
output. Gives continuously variable voltage within the step range.
Coaxial
connector from arm of CAL VOLTAGE potentiometer. Provides the
same voltage as is applied to vertical amplifier input.
Connector to provide plate and filament power for a cathode-follower probe.
CRT CONTROLS
Potentiometer in the graticule light circuit to vary brightness of scale illumination.
Potentiometer varying the voltage of the focusing anode of the cathode-ray tube.
Potentiometer adjusting the control-grid bias on cathode-ray tube to adjust spot
intensity.
Potentiometer adjusting the grid bias of a cathode-follower voltage regulator
supplying astigmatism-grid voltage on cathode-ray tube.
Potentiometer setting the grid voltage of one-half of the phase-inverter amplifier
stage.
Since the amplifier is de coupled, variation of the de level at this stage
varies the average de voltage between the vertical-deflection plates.
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GENERAL DESCRIPTION - PAGE 3
TYPE 524AD

HORIZONTAL
POSITION
EXT MARKER
(CRT CATH)
Time Marker
Switch
PHASE
AMPLITUDE
+GATE
-GATE
MAG. POS.
µSEC/CM
MULTIPLIER
SWEEP
DELAY
SWEEP
OUTPUT
FIELD
SHIFT
EXTERNAL
SWEEP
INPUT
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TYPE 524AD
Pocentiometer setting bias of first sweep-amplifier V218A. Since sweep amplifier
is de coupled,
change in de level at this point affects average voltage between
horizontal-deflection plates.
TIME MARKER
Front-panel connector connected through the EXT position of the time marker
switch and through a .015-µf capacitor to the cathode-ray tube cathode.
Six-position
gang switch selects circuit constants for time-mark time intervals
and connects marker to cathode-ray tube cathode circuit in five of the six switch
positions.
In sixth position switch turns off time-marker generator and connects
cathode-ray tube cathode to external binding post.
Control to delay the start of the markers up to 1.5 µsec.
Variable
resistor setting bias of clipper amplifier and thereby setting amplitude of
marker pips.
SWEEP GENERATOR
Front-panel binding post to cathode of gate-output amplifier. Peak voltage about
30 volts de coupled to binding post.
Front-panel binding post to plate of gate-output amplifier through 0.047-µf capaci-
tor.
Peak voltage about 30 volts.
Screwdriver front-panel control adjusts bias of phase-inverter sweep-amplifier
stage to permit adjustment fo magnified-sweep position so that the magnified
sweep
centers at the center of the screen.
Ganged variable resistors in timing-capacitor charging circuit and multivibrator-
timing circuit. Units dial controls ten-position gang switch increasing resistance
by equal increments in both timing-capacitor circuit and multivibrator-timing
circuit. Tenths dial controls dual variable resistors in series with step resistors.
Dial is calibrated in conjunction with variable resistors. Sum of units-dial read-
ing and tenths-dial reading gives sweep-time multiplying factor.
Three-tum potentiometer setting grid bias of voltage-comparator tube. Deter-
mines point on triggered sawtooth at which delayed trigger voltage is generated.
Triggered sawtooth has maximum repetition rate of 30 per second. Permits trig-
gering sweep on any line of television field.
Front-panel connector from cathode-follower amplifier provides a positive-going
sawtooth voltage simultaneously with the sweep. Fixed peak voltage of about
40 volts, de coupled to binding post.
Extends duration of one delay-timing sawtooth so that an extra vertical sync
pulse is missed,
and sawtooth thereafter synchronizes with alternate field.
External front-panel connection to the sweep amplifier, de coupled to amplifier
through EXT SWEEP ATTEN potentiometer.
GENERAL DESCRIPTION - PAGE 4

TIME
STABILITY
(EXT. SWEEP
ATTEN.)
AMPLITUDE
(INT 60'v
SWEEP
PHASE)
SELECTOR
EXTERNAL
TRIGGER
INPUT
POWER
Seven-position ganged switch. Selects five sizes of timing capacitors in sweep
circuit and corresponding five sizes of capacitors in multivibrator timing circuit.
In remaining two positons, connects EXTERNAL SWEEP INPUT connector
or internally-developed 60-cycle sine wave to sweep amplifier, and biases gating
multivibrator off to unblank cathode-ray tube.
Ganged dual potentiometer. Adjusts bias on gating multivibrator in region of bias
for recurrent operation. Second potentiometer provides amplitude adjustment for
external sweeps.
TRIGGER
Potentiometer setting bias on trigger-amplifier tube to adjust gain and operating
point. Ganged with variable resistor in 60-cycle phasing circuit which varies
phase of sine-wave sweep when SWEEP TIME switch is in INTERNAL 60'v
SWEEP position.
Ten-position switch selects various sources of trigger voltage and arranges trig-
ger-amplifier output circuit to maintain positive trigger output for either polarity
of input pulse. In the UNDELA YED SWEEP positions, output of the trigger-
phase changer is applied to sweep circuit directly. In the DELAYED SWEEP
positions marked in red on the panel, input triggers pass through a sync separator
and are arranged to trigger a sawtooth generator which produces a second trig-
ger delayed by an adjustable time after the first trigger.
Coaxial connector to EXT position of trigger SELECTOR switch.
Toggle switch in primary circuit of power transformer.
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GENERAL DESCRIPTION - PAGE 6
TYPE 524AU

OPERATING INSTRUCTIONS
Preliminary Instructions
COOLING
The Type 524AD Oscilloscope is cooled by
filtered, forced-air ventilation. The instrument
must therefore be placed so the air intake is not
blocked, and the filter must be clean enough to
permit adequate air circulation. If the interior
temperature does rise too high for some reason,
a thermal cutout switch will disconnect the pow-
er and keep it disconnected until the temperature
drops back to a safe value.
Keep the instrument dry. If is it exposed to
excessive dampness, let it dry thoroughly before
operating it.
CATHODE-RAY TUBE CONTROLS
The Type SABP cathode-ray tube used in
this
instrument has a total deflection potential
of about 4000 volts. With this amount of accel-
eration,
the spot can be bright enough to dam-
age the screen if it is left long in one place. Be
careful to turn the INTENSITY control to the
left so that the spot is dim whenever you leave
the instrument unattended.
Individual FOCUS, ASTIGMATISM, and
INTENSITY controls are available on the front
panel. These controls are slightly interdepen-
dent, and may require readjustment for different
INTENSITY control settings.
ILLUMINATED GRATICULE
The adjustable graticule lighting control la-
beled SCALE ILLUM.,
can be adjusted to suit
the lighting conditions of the room. The colored
filter supplied is colored
to provide the maxi-
mum trace contrast for the Pl phosphor in the
presence of room light.
The graticule is accurately scribed in centi-
meters, and the sweep times and vertical-de-
flection
factors are given in units per centimeter.
To find volts from the amplitude of deflection,
therefore, multiply centimeters of deflection
from the graticule reading by the volts per centi-
meter indicated by the vertical-amplifier dial
settings. Similarly, to find time, multiply centi-
meters along the time axis of the graticule by
the sweep time per centimeter indicated by the
sweep-dial settings.
The graticule can be mounted in either of two
positions, rotated 180 degrees from each other.
In one position, the graticule illumination is
colored red,
and in the other position it is white.
The red contrasts well with the green filter. The
white is more satisfactory photographically.
First Time Operation
To place the Type 524AD in operation for
the first time, the following procedure is sug-
gested:
I. Connect to a source of 50-60 cycle, 105-
125 v power (or 210-250 v if T401 primary
connections have been changed accord-
ing to the directions shown in the Adjust-
ment Section of this manual).
2. Set controls as indicated below.
INPUT SELECTOR CAL., AC
VOLTS/CM 15-50
VARIABLE ATTEN. Clockwise
CAL. VOLTAGE RANGE
50
CAL. DUTY CYCLE Mid range
CAL.VOLTAGE 0
SELECTOR
+SIG,
UNDELAYED
SWEEP
AMPLITUDE
Counterclockwise
STABILITY
Counterclockwise
TIME
100 µsec/cm
TIME MULTIPLIER
5.0
MAGNIFIER
OFF
TIME MARKER
EXT
3. Turn POWER switch to ON and wait
about 60 seconds.
4. Set INTENSITY control at about ¼
clockwise rotation.
5. Adjust VERTICAL POSITION, HORI-
ZONTAL POSITION, ASTIGMA-
TISM,
and FOCUS until a sharply fo-
cussed spot is obtained at the left center
of the screen.
CAUTION - DO NOT ALLOW
THIS SPOT TO BE EXCES-
SIVELY BRIGHT OR REMAIN
FOR LONG IN ONE POSI-
TION.
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OPERATING INSTRUCTIONS- PAGE 1
'l'YPE 524AlJ

6. Advance the sweep ST ABILITY con-
trol until a sweep appears, then turn it
back until the sweep just disappears.
7. Set the CAL. VOLTAGE control to 5
(50 v).
8. Advance the trigger AMPLITUDE con-
trol to obtain a stable trace of a square
wave (about 3½ cm vertical deflection).
The oscilloscope is now displaying the square-
wave calibrating voltage. To observe other
waveforms, connect to either INPUT 1 or IN-
PUT 2 and set the INPUT SELECTOR ac-
cordingly. Adjust the VOL TS/CM and VARI-
ABLE
ATTEN for the desired amount of verti-
cal deflection, and then select the appropriate
sweep time by means of the sweep TIME and
µSEC/CM MULTIPLIER controls.
Sweep Operation
GENERAL
The sweep circuit of the Type 524AD is very
flexible and is capable of synchronizing at high
frequencies.
Fundamental frequencies as high
as 10 me can be observed easily. By adjusting
the sweep STABILITY control, the sweep can
be
made to run recurrently or triggered as de•
sired.
ADJUSTMENT OF SWEEP STABILITY
The sweep STABILITY control varies the
multivibrator bias and therefore determines
whether the sweep will operate recurrently or
wait for a trigger impulse. Correct functioning
for triggered operation is therefore obtained
when the STABILITY control is set just under
the point where oscillation takes place. The pro-
cedure is to remove the trigger source by turn-
ing the trigger AMPLITUDE control counter-
clockwise, advance the STABILITY knob until
a
sweep appears, and then decrease it until it
just disappears.
NOTE- When using the internal
( +SIG. or -SIG.) trigger impulses
to view signals at fundamental fre-
quencies
of about 2 me or higher, it
will be necessary to advance the
STABILITY control somewhat
above the normal operating point to
secure a stable pattern.
The µSEC/CM MULTIPLIER
dials also may have some effect up-
on the critical bias for triggered op-
eration of the multivibrator. The
STABILITY control may need to
be readjusted when the MULTI-
PLIER dials are changed.
FUNCTION OF TRIGGER SELECTOR
This control selects the trigger impulses to
be used from three sources: the line frequency
(601\/), the vertical amplifier (+SIG. or -SIG.)
and the EXTERNAL TRIGGER INPUT coax
connector. The trigger SELECTOR switch is
divided
into two sectors of rotation. One sector,
marked in black, provides positions for all types
of trigger signals without the delayed-trigger cir-
cuit.
The other sector provides the same posi-
tions as the first sector, but includes the delayed
trigger circuits. When using those marked (+ ),
the sweep starts during the rising portion of the
trigger impluse. When using the positions
marked (-), the sweeps start during the falling
protion. For satisfactory operation in the EXT
positions, trigger amplitudes between .5 volts
and 15 volts peak should be provided. Larger
trigger voltages should be attenuated externally.
ADJUSTMENT OF TRIGGER AMPLITUDE
The trigger AMPLITUDE control sets the
bias in the trigger amplifier and thereby adjusts
the amplitude of the impulse which reaches the
multivibrator. After the sweep STABILITY is
set as
described previously, and the trigger SE-
LECTOR
switch is set to the correct position,
advance the trigger AMPLITUDE control until
a
stable trace is obtained. When the trigger
source is a slowly changing wave such as a sine
wave or sawtooth, adjustment of the AMPLI-
TUDE setting will change the phase of the sig-
nal relative
to the start of the sweep.
In general, it is desirable to use the minimum
AMPLITUDE setting required to insure a
stable trace.
If poor synchronizing is experienced when
the Type 524AD is used to observe repetitive
signals containing erratic peak voltages, such
as are produced by vibrating contacts, it may
be possible to form a stabilized trigger signal
by the use of auxiliary limiting and differentiat-
ing circuits. The trigger SELECTOR switch
should then be set to the proper EXT polarity,
and connection should be made to the EXTER-
NAL TRIGGER INPUT connector.
ADJUSTMENT OF SWEEP TIME
The combination of sweep TIME and
µSEC/CM MULTIPLIER controls allows the
operator to vary the sweep time so that the
marked portion of the graticule ( 10 cm) is cov-
ered in any time from .1 sec to 1 microsec. The
approximate number of microseconds for a
horizontal deflection of 1 cm can be determined
easily by multiplying the TIME setting by the
sum of the MULTIPLIER dial readings. Mul-
tiply this figure by ten to determine the time
required to sweep the entire 10-cm portion of
the graticule which is calibrated in centimeters.
TYPE 524AD OPERATING INSTRUCTIONS-PAGE 2
®1

The MULTIPLIER consists of a 10-step con-
trol and a continuously variable control, with
the step-control dial numbers serving as indices
for the hand-calibrated variable dial. These
dial readings are added to determine the multi-
plying number. Since 100 dial divisions are pro-
vided for each 10-to-1 TIME range, accurate
indication and precise resetting are made pos-
sible.
The overall accuracy of the sweep-time cali-
bration is dependent on several factors, includ-
ing linearity of the sweep amplifier and the
cathode-ray tube, but the actual time for a
10-cm
sweep will be within five per cent of the
indicated time at any setting of the controls.
Compensation for variations caused by different
tubes, etc., can be made by means of screwdriver
adjustments inside the case. Procedure for
these adjustments will be found in the Main-
tenance section.
RECURRENT SWEEP
Jn case it is desirable to have a sweep without
using any sort of trigger, retard the trigger
AMPLITUDE control and advance the sweep
STABILITY control until a stable repetitive
sweep is obtained.
SINGLE SWEEP
The triggered sweep circuit used in the
Type 524AD inherently provides for single-
sweep operation. The beam is blanked out until
the trigger simultaneously turns it on and starts
the sweep. For single-sweep operation, a me-
chanical contact or hand key can be connected
between the EXTERNAL TRIGGER INPUT
connector and ground, with the trigger SELEC-
TOR switch at -EXT. If multiple sweeps occur
because of intermittent or bouncing contact, a
capacitor of .1 µf to 1 µf should be connected
across the contact. This capacitor will charge to-
ward about 10 volts through 1 megohm and the
long time constant will prevent an immediate re-
currence of the sweep. Use minimum dependable
trigger AMPLITUDE setting.
SWEEP DELAY
The SWEEP DELAY control will produce
triggers no faster than 30 times per second. This
control adjusts the amount of delay between
receipt of the trigger and the start of the sweep.
The delay circuit operates only when the trigger
SELECTOR switch is in the DELAYED
SWEEP sector. The panel markings give an
approximate indication of the delay.
When a composite television signal enters
the sweep-delay circuitry a sync separator ex-
tracts the 60-cycle field-sync pulse. The sweep
delay, operating 30 times per second, accepts
every other vertical-sync pulse and starts the
sweep from zero milliseconds to 25 milliseconds
after the accepted sync pulse. This amount of
delay allows the sweep to display any of the
lines in one field.
FIELD SHIFT
When the FIELD SHIFT button is depress-
ed, the other 60-cycle vertical-sync pulse is ac-
cepted by the sweep delay circuitry, allowing
display of the other interlaced field.
SWEEP MAGNIFIER
Frequenty it is desirable to examine a portion
of the waveshape under observation in greater
detail, for instance the rate of fall of a fairly
long pulse. In the 524AD, the sweep magnifier
makes it possible to expand any desired 33.3
per cent or IO per cent of the sweep to cover
the entire tube face. The operating procedure
is as follows: Turn the sweep MAGNIFIER
to OFF. Adjust the sweep-time and horizontal-
positioning controls so that the portion of the
wave to be magnified is at the center of the tube.
Then move the MAGNIFIER control to either
3X or lOX and the portion of the wave in the
center of the tube will be magnified linearly in
both directions. The accuracy of sweep magni-
fication will be within five per cent for sweep
speeds to 1.0 µSEC/CM. The accuracy will de-
crease for sweep speeds in excess of this amount.
If the portion of the wave to be magnified
moves from the center of the screen when the
MAGNIFIER is turned to one of the two po-
sitions for magnification, the MAG. POS. ad-
justment should be reset. (See Maintenance
section.)
NOTE: A sweep of 10 cm per mi-
crosecond is about the limit of the
sweep amplifier. Some non-linear-
ity will result if the sweep exceeds
this value.
EXTERNAL SWEEP INPUT
In the full-counterclockwise position of the
sweep TIME switch a binding post labeled EXT
SWEEP INPUT is connected to the sweep-
amplifier input. This connection can be used,
for example, for a sine-wave oscillator for fre-
quency-comparison measurements, for an aux-
iliary slow-sweep generator, etc. The connection
to the sweep amplifier is made through a po-
tentimeter ganged with the sweep STABILITY
control, for adjustment of the amplitude of the
external sweep. The magnifier circuits and the
horizontal-positioning control operate on sweep
voltages applied at this connector. At maximum
sensitivity with the MAGNIFIER at lOX and
the SWEEP ATTEN. control full clockwise,
the deflection factor is about .25 volts per centi-
meter, peak to peak.
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OPERATING INSTRUCTIONS-PAGE 3
TYPE 524AD