Tektronix 567 User manual

INSTRUCTION
MAN UAL
Tektronix, Inc.
Serial Number
TYPE 567
READOUT
OSCILLOSCOPE
S.W. Millikan Way @ P. O. Box 500 @ Beaverton, Oregon 97005 ® Phone [phone] @ Cables: Tektronix
070-0322-01
965

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for baeeen i

SECTION 1
CHARACTERISTICS
General Information
The Tektronix Type 567 Readout Oscilloscope is the
power supply and indicator unit for a complete system
that provides digital readout of signal information. The two
smaller plug-in cells accept any of the Tektronix 2 or 3
Series plug-in units. The large plug-in cell accepts the
Tektronix 6 Series digital units. The digital units are com-
patible with some (but not all) of the 2 or 3 Series units.
See your Tektronix Field Engineer for details. Without the
digital unit, the Type 567 will operate in the normal oscillo-
scope manner. With the digital unit, the system can readout
its own display of risetime, amplitude or time difference for
either conventional voltage-time displays or sampling equiva-
lent-time displays. The system provides “go, no-go" signals,
and can be programmed automatically using up to three
Tektronix Type 262 Programmers.
ELECTRICAL CHARACTERISTICS
Power Supplies
Electronically regulated for stable operation with widely
varying line voltages and loads.
Line voltage requirements—105 to 125 volts, or 210 to
250 volts, rms, 50 to 60 cps, single-phase ac.
Power—Approximately 400 watts when using the Type
3876, 3177 and 6R1A Plug-in Units.
Fuse—4 Amp Fast-Blow for 117 volts, 2 Amp Fast-Blow
for 234 volts.
Cathode-Ray Tube
Type—T5032-2-1 (S/N 1999-up}
5610-31 (S/N 750-1998}
T5031-2 {S/N 101-749)
Phosphors—Standard phosphors as listed above, others
available as listed with accessories at end of this section.
Unblanking—Deflection type, de coupled.
Accelerating potential—Approximately 3.5 kv.
Usable viewing area—8 divisions vertical by 10 divisions
horizontal.
Deflection plate deflection factors (nominal at 3.5 kv)
(S/N 1999-up (S/N 101-1998}
19.5 volts/div 22.8 volts/div
Horizontal—18.4 volts/div 18.4 volts/div
Vertical—
Graticule
Internal within ert (S/N 1999-up)
External plastic (S/N 101-1998}
®1
I{lumination—Variable edge lighting.
Markings—Marked in 8 vertical and 10 horizontal 1-centi-
meter divisions with 2-millimeter markings on the centerlines.
Amplitude Calibrator
(S/N 2060-up). A square wave with accurate time
duration and amplitude; intended for use when setting the
vertical and horizontal plug-in units front-panel calibrate
controls. Two output frequencies, an accurate 20 kc and an
approximate 1 kc. The 1-kc square wave is valuable when
adjusting low-frequency attenuator probes.
Output Voltage—Separate BNC connectors produce
ground-referenced 0.5 and 5 volts peak to peak when loaded
(one or both at the same time) by 100k or greater. Same
connectors provide 50 and 500 mv peak to peak when loaded
{one at a time) by 50 ohms.
Accuracy—Voltage accurate to --2% peak to peak into
100k or greater loads. Voltage accuracy into 502 depends
on load resistor: -—-2% peak to peak when 50 is within
1% at one output connector at a time.
Frequency of 20-kc square wave is within 0.1% when the
l-ke square wave is within +80% and —40%; symmetry
not specified for either frequency.
+Pre Trigger—A short-duration, ground-referenced, posi-
tive pulse at least 600 mv peak to peak into 100k or greater,
that occurs approximately 1%, cycle ahead of each plus rise
of square-wave signal. Amplitude is reduced by 502 load,
but +Pre Trigger signal is intended for externally triggering
the time-base units of sampling systems not employing an
internal trigger pickoff.
All three output connectors of the Amplitude Calibrator
are short-circuit proof. External short circuits will not damage
the calibrator circuits.
(S/N 101-299). Waveform—Square waves at line fre-
quency.
Output Voltage—0.05, 0.5, 5 and 50 volts, peak to peak
into 1 meg or greater load, one at a time.
Accuracy—Peak-to-peak amplitude of square waves within
3% of indicated voltage.
(S/N 300-2059). Above characteristics plus 100-mv
peak-to-peak square wave available from 0.5 jack when
loaded with 1% 509.
Ventilation
Forced, filtered air. A thermal relay interrupts instrument
power in the event of overheating. Fan remains on if thermal
relay opens during 117-volt operation. Fan turns off. if
thermal relay opens during 234-volt operation. Temperature
of the thermal relay must drop about 15° F before power
will be restored.
1-1

Characteristics—Type 567
MECHANICAL CHARACTERISTICS
The Type 567 is constructed with aluminum-alloy chassis
and cabinet. Cabinet is finished with a durable blue vinyl
plastic. The unit sits on short anti-slide neoprene feet.
Cabinet dimensions—Height 135/,”, width 17”, depth 23”.
Accessories
Information on accessories for use with this instrument is
included at the rear of the mechanical parts list.
®i

SECTION 2
OPERATING INSTRUCTIONS
General Information
The Type 567 is a specially designed oscilloscope for
producing digital display of information which can be
obtained only from the crt on an ordinary oscilloscope. The
digital readout system can be made to display either voltage
or time, and may be used for such applications as measuring
the peak-to-peck amplitude of a waveform, or its risetime.
IF dual-trace plug-in units are used with the Type 567, the
digital readout system can be used to obtain both voltage
and time measurements on either trace, In addition, the
digital readout system will make time measurements between
signals displayed on one trace and signals displayed on
the
other.
The Type 567 and associated units are relatively easy to
operate once the basic operating procedures are understood.
It is the purpose of this section ond similar sections in the
plug-in unit manuals to establish the proper operating tech
niques. This
manual covers instructions for the Type 567
‘only. For operating instructions for the plug-in units, refer to
the applicable instruction manuals.
Preliminary Instru
Before operating the Type 567, a suitable location for the
instrument must be chosen. The location should provide a
stable support for the instrument. Care should be taken that
adequate air circulation is permitted through the instrument
by keeping it away from walls, or from other equipment
which might block the air intake through the filter or the
exhaust passages in the cabinet. If the flow of air over the
components in the unit is interrupted, overheating of the
instrument may cause a thermal relay in the instrument to
open, shutting down the instrument.
ns
The Type 567 Oscilloscope can be operated from 110,
117,
or 124 volts, or 220, 234, or 248 volts. The only changes
necessary to convert from one operating voltage to another
are in the wiring of the power transformer primary and the
fan
motor. The power transformer used in the Type 567
Uses two separate primary windings plus two 6% boost-buck
windings. The primary windings are connected in parallel
for 117-volt operation and in series for 234-volt operation:
Proper connections for each line voltage are shown on the
side of the power transformer and on the Power Supply
schematic.
A small metal tag near the power receptable at the rear
of the instrument indicates the line voltage for which the
instrument was wired at the factory. If wired for 117 volts,
the instrument will operate properly with line voltages be-
tween approximately 105 and 125 volts. If wired for 234
volts, the instrument will operate properly from approximately
210 to 250 volts.
Jo change the power transformer connections for opera:
tidn on another line voltage, change the location of the
bare
wire
straps
at
the
primary
terminals,
It
is
not
necessary
to move any of the plastic insulated wires. Place the new
straps in accordance with the markings on the tag located
fon the power transformer side.
When a suitable location has been chosen, set the POWER
ON switch to the off position and connect the instrument to
{an appropriate source of power. Place the desired vertical
plugin unit (for example, the Type 3A2 or 3876) in the left
plug-in compartment of the oscilloscope (see Fig. 2-1). Place
the horizontal plug-in unit (for example, the Type 382 or
3177) in the center compartment. Finally, place the desired
digital unit (for example, the Type éRI or 6RIA) in the right
compartment of the oscilloscope. Make certain all units are
properly inserted and locked in place before turning on the
oscilloscope power. The horizontal and vertical. plug-in
units are locked in place by turning the front-panel knurled
‘aluminum locking knobs clockwise. The digital unit is locked
in place by removing the right side panel and tightening the
two fasteners at the rear of the compartment.
Fig. 2-1, Type 567 plug-in co yartments
Checking Plug-In Ui
Each vertical, horizontal and digital plug-in unit must
be calibrated within the particular oscilloscope in which it
is to be operated. Units purchased as a system (oscilloscope
‘and three plug-ins) are calibrated together as a system at the
factory, Units purchased separately, or calibrated separately,
must have their basic gain adjusiments made when they
are installed
Accuracy
Individual oscilloscope crt deflection factors differ within
normal limits. The vertical and horizontal units have front:
panel Calib controls so the particular amplifier gain can be
set to that needed by the crt. Some sampling plug-in units
have internal digital gain controls that must be correctly
adjusted. See the individual plug-in unit instruction manval
calibration procedure for details.
The digital unit is sensitive to the oscilloscope power-supply
voltages. Digital readout accuracy is closely related 10
power-supply voltage accuracy. Since it is impossible to
21

Operating Instructions—Type 567
make all Type 567 Oscilloscope power supplies to have
exactly the same voltage accuracy, the digital unit must be
calibrated in the oscilloscope in which it is used. If a cali-
brated digital unit (either Type 6R1 or 6RIA) is placed into
another Type 567 Oscilloscope, check the accuracy of the
start and stop voltages and the rate of rise of the voltmeter
ramp before relying on either time or voltage readout.
See the digital unit instruction manual calibration procedure
(Type 6RIA steps 5 and 6; Type 6R1 steps 15 and 17} for
details.
Intensity Control
The INTENSITY control is used to adjust the brightness
of the oscilloscope display. Begin with INTENSITY control
counterclockwise, because some plug-ins permit a_ bright
spot during warm up. After turning on the instrument and
waiting a few minutes for warm up, free run the oscilloscope
sweep by setting the TRIGGER SENSITIVITY or LEVEL control
fully clockwise. Adjust the INTENSITY control for a suitable
trace intensity.
Do not leave a bright, sharply focused spot on the crt
screen for a prolonged period. An excessively bright sta-
tionary spot may damage the crt phosphor.
Focus and Astigmatism Controls
The FOCUS and ASTIGMATISM controls are used in con-
junction with each other to produce a well-focused display
on the oscilloscope screen. Because changes in the setting
of the INTENSITY control may affect focus slightly, the trace
should be focused with the actual waveform displayed and
with the desired intensity setting. Refer to the appropriate
plug-in manuals for instructions for applying a signal to the
oscilloscope and obtaining a stable display. With a signal
displayed, carefully adjust the FOCUS and ASTIGMATISM
controls alternately for best possible focus over the entire
display. There is an intensity level above which a good
focus is impossible to attain.
Scale Illumination Control
The ert graticule is edge-lighted by two small lamps at
the bottom. The lighting can be adjusted to suit the ambient
light conditions by means of the SCALE ILLUM control.
Rotating the control clockwise increases the brightness of
the graticule scale markings. The graticule is marked with
eight 1-centimeter divisions vertically and ten 1-centimeter
divisions horizontally, with 2-millimeter markings on the
centerlines.
Changing Plug-In Units
Horizontal and vertical plug-in units used in the Type 567
may be changed at any time. However, it is recommended
that the instrument be turned off while a change is made.
This affords maximum protection to the oscilloscope and
other plug-in units against sudden transients and load
changes.
Whenever a horizontal or vertical plug-in unit is changed,
it is important that you check both the gain and timing of
the oscilloscope. This will ensure accurate measurements.
2-2
Se LR Ao
Amplitude Calibrator (SN 2060-up)
The Amplitude Calibrator provides a choice of four square-
wave voltages with amplitude tolerance of +2%. 0.5 and 5
volts peak to peak when loaded (one or both at the same
time) by 100k or greater, and 50 and 500 mv when loaded
(one at a time) by 502 +1%. Two frequencies are avail-
able: crystal-controlled 20-kc {=:0.1%) square waves, and
1-ke (--20%) square waves. The two frequencies are select-
able by a front-panel 20 KC-==1 KC toggle switch. The volt-
age accuracy of any one of the four output voltages may be
adjusted to within —%% by special calibration.
The Amplitude Calibrator is valuable for adjusting the
front-panel Calib controls of both vertical and horizontal
real-time or sampling plug-in units. The 20-ke frequency (and
the ability to make one of the output voltages very accurate}
permits checking the system operation including digital unit
time and voltage readout. The 1-ke frequency is valuable
for compensating low-frequency attenuator probes.
Front-panel BNC connectors permit convenient 50 cable
connection of calibrator signals to the plug-in unit input
terminals, or to external equipment. If the vertical plug-in
unit has a high-impedance input, the two higher square-wave
voltages will apply. Addition of an external 50Q termina-
tion (Tektronix Part No. 011-0049-00) at the plug-in input
connector will provide the two lower voltages. If the plug-in
unit has an internal 50 Q termination, do not add the external
termination when accurate voltages are desired. (Actually,
the Amplitude Calibrator is short-circuit proof, so any load
is permissible, but accurate voltages are obtainable only as
above.)
The +Pre Trigger connector delivers a positive pulse ap-
proximately 4 cycle before each positive step of both the
20-kc and 1-kc square-wave signals. Sampling plug-in time-
base units can effectively use the +Pre Trigger signal (at
20 kc) for external triggering. A positive step will then appear
near the beginning of the display, produced without external
delay cable in the pretrigger signal path.
(S/N 300-2059)
The Amplitude Calibrator provides a choice of four square-
wave signals with peak-to-peak voltages of 0.05, 0.5, 5
and 50 volts --3% when loaded by 1 megohm or greater.
In addition, a signal of 100 mv peak to peak +3% into a
502 (1%) resistance is provided from the 0.5 jack. This
voltage is valuable for checking the vertical calibration of
sampling plug-in units. Frequency of the square wave is
that of the power line.
(S/N 101-299)
The Amplitude Calibrator provides a choice of four square-
wave signals with peak-to-peak voltages of 0.05, 0.5 5 and
50 voits +3% when loaded by 1 megohm or greater. Fre-
quency of the square wave is that of the power line. The
Amplitude Calibrator is valuable for checking real-time plug-
in unit calibration and the compensation of attenuator probes.
It is also valuable as a time reference for adjusting the
horizontal unit calibration; three complete cycles at 60 cps
line frequency occur’ in 50 milliseconds (2 cycles at 50 cps
line frequency occur in 40 milliseconds).

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LOAD
CURRENT
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PLUG-IN
UNIT
(Milliamperes)
Fig. 2-2. —100-volt supply shunt.
Skeleton Plug-In Units
Skeleton plug-in units for the vertical and horizontal sec-
tions are available for all of the Tektronix Type 560 Series
oscilloscopes, including the Type 5467. None are available for
the large plug-in area used for digital readout. These skele-
ton units permit you to build your own plug-in circuitry for
use in the Type 567. If you use your own circuitry, pro-
vision may be made for operating the digital readout cir-
cuits, although this is not necessary. Order the skeleton
chassis as Modification Kit number 040-0245-00 from your
local Tektronix Field Office.
A dummy cover is available for the digital cell. Order by
Tektronix Part No. 016-0051 -00.
Power Supply Capabilities
The total de power available for vertical and horizontal
plug-in use is 85 watts divided between four regulated sup-
plies. The remaining power available must be reserved for
the digital units. Use of current from any of the unregulated
de supply leads is not recommended.
The four regulated de supplies listed in Table 2-1 are em-
ployed by the X and Y axis amplifiers.
Since the Type 567 indicator unit employs two plug-in
units to operate the X and Y axes of the crt, currents listed
in Table 2-1 are normally divided between them. However,
a single plug-in alone can be used, such as a vertical ampli-
fier, with moving-film recording used instead of a horizontal
sweep. In such a case, it will be necessary to elevate the
crt horizontal deflection plates to approximately +180 to
On
Operating Instructions—Type 567
TABLE 2-1
Type 567 Power Supply Current
Capabilities For X and Y Plug-In Units
Supply Max. Total Connector
Current Terminals
Reg. —100 vdc 130 ma 23— to 9 ground
Reg. —12.2 vdc 1.5 amps 16— to 5 ground
~ Reg. +125 vde _ 150 ma 15+ to 9 ground
Reg +300 vde 150 ma 10+ to 9 ground
5 amps per
Unreg. 6.3 vac plug-in 1-2
+210 volts de to permit proper focus and astigmatism
control.
The limit of the amount of power which can be dissipated
in one plug-in unit is based primarily upon the ambient
temperature and amount of ventilation supplied. Vacuum
tubes should not be operated with envelope temperatures
above 150° C when the ambient temperature is at 25° C,
or above 175° C when the ambient temperature is at 50° C.
The Type 567 indicator unit can be operated in ambient
temperatures up to 45°C.
Separate terminals are provided for the ground return of
the —12.2-volt regulated heater supply. When using this
supply in your own plug-in design, it is best to run two leads
to the heater terminals so that the ground lead can be
connected directly to terminal 5, thus eliminating ground
currents.
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0 25 50 75
LOAD CURRENT OF ONE PLUG-IN UNIT
(Milliamperes)
Fig. 2-3. + 125-volt supply shunt.
2-3

Operating Instructions—Type 567
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LOAD CURRENT OF ONE PLUG-IN UNIT
(Milliamperes)
Fig. 2-4. +300-volt supply shunt.
above 150° C when the ambient temperature is at 25° C,
or above 175° C when the ambient temperature is at 50° C.
The Type 567 indicator unit can be operated in ambient
temperatures up to 45°C.
Separate terminals are provided for the ground return of
the —12.2-volt regulated heater supply. When using this
supply in your own plug-in design, it is best to run two leads
to the heater terminals so that the ground lead can be
connected directly to terminal 5, thus eliminating ground
currents.
TABLE 2-2
Recommended Type 567 Regulated
Power-Supply Shunt Resistors?
Shunt Resistor
Values —100v +125 v +300 v
No Shunt | 0 to 25ma| 0 to 45ma| 0 to 40ma.
20009, 5w_ be-
tween proper ter | 99 +9 45ma|25 to 60ma 35 to 67ma
minals of power
connector. _
SHORT,
between proper
terminals of pow- | 40 to 65ma/50 to 75 ma |65 to 75 ma
er connector.
1Currents listed are one-half total available, based on two plug-
in units being used.
Suggested Power-Supply Shunt Resistor Values
To make efficient special use of the Type 567 indicator
unit power supply, the load currents and maximum or mini-
mum load values must be known.
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Terminals X, Y¥, and Z are
located in plug-in units X = +300-Volt Shunt
Y = +125-Volt Shunt
Z = —100-Volt Shunt
Fig. 2-5. Power-supply shunt resistor connections.
The nature of series-regulated power supplies permits ob-
taining more current from them than can normally be handled
by the series tube alone (providing the power transformer
and rectifiers can supply more current). By placing a shunt
resistor of appropriate value across the series regulator tube,
additional current can be made available for the load. The
correct value shunt resistor must be chosen to permit the
regulator system to deliver current with low ripple, and the