Tektronix 507 User manual

CATHODE- RAY OSCILLOSCOPE
TYPE 507
INSTRUCTION
MANUAL
TEKTRONIX, INC.
MANUFACTURERS OF CATHODE-RAY AND VIDEO TEST INSTRUMENTS
IM -507-1
Sunset Highway and Barnes R ad • P.O.B x 831 • P rtland 7, Oreg n, U. S. A.
Ph ne: CYpress 2-2611 • Cables: Tektr nix
TYPE 507 SERIAL NUMBER _________

Copyrig t © 1959 by Tektronix, Inc.,
Portland, Oregon. Printed in t e
United States of America. All rig ts
reserved. Contents of t is publica 
tion may not be reproduced in any
form wit out permission of t e copy 
rig t owner.

CONTENTS
Vertical Deflection System. Sweep Circuit. Power Sup 
plies. Miscellaneous. Functions of Controls and Con 
nectors.
GENERAL DESCRIPTION
SECTION 1
Sweep. Vertical Deflection System. Cathode-Ray Tube
Circuit. igh-Voltage Power Supply. Time Mark Gen 
erator. External Power Supply.
CIRCUIT DESCRIPTION
SECTION 2
Preventive Maintenance. Analyzing Trouble.
MAINTENANCE
SECTION 3
ADJUSTMENT PROCEDURE
SECTION 4
PARTS LIST
SECTION 5
SCHEMATIC DIAGRAMS
SECTION 6
ACCESSORIES
SECTION 7
507 ®

GENERAL DESCRIPTION
T e Tektronix Type 507 Oscilloscope is a specialized instrument
designed primarily for ig -voltage surge testing as applied to
power transformers, ig -voltage insulators, lig ting arrestors and
allied components, and t eir associated design and acceptance
tests.
T e use of a 24-kv accelerating potential on a new type cat ode
ray tube permits p otograp ic recording of single sweeps at t e
maximum writing-rate permitted by t e vertical deflection and
sweep circuits. T e vertical deflection system provides a risetime
of approximately 5 millimicroseconds and a sensitivity of approx 
imately 50 v/cm. An external lengt of delay cable can be inserted
into t e vertical-input signal circuit to permit viewing of t e lead 
ing edge of t e waveform w ic triggers t e sweep. Time markers
are available for convenient calibration of t e sweep.
T e Type 507 consists of two units, indicator and power supply,
mounted on a Scope-Mobile, t us making a convient mobile unit.
If desired, t e units may be lifted off t e Scope-Mobile for benc
use.
VERTICAL DEFLECTION SYSTEM
Transient Response
Risetime between 10-percent and 90-percent
amplitude points is about 5 millimicroseconds
(.005 microseconds). A passive damping network
inserted in t e deflection leads is adjusted for
optimum transient response wit out overs oot
or ringing.
T e maximum vertical sensitivity wit a Type
T507P cat ode-ray tube operated at 24-kv ac 
celerating is 50 v/cm.
Attenuator
A step attenuator wit a c aracteristic imped 
ance of 72 o ms is provided in t e vertical-input
signal circuit. T e attenuator is composed of
ten equal resistors of 7.2 o ms eac , mounted
on a tap switc . T e percentage of input signal
applied to t e deflection plates can be selected
by t e tap switc from 10 percent to 100 per 
cent in 10-percent steps.
Signal Mode
A t ree-position switc reverses t e deflection 
plate polarity; t e center position of t e switc
is used in conjunction wit a trigger-selector
switc to apply markers for p otograp ing time
references.
Positioning Switc
T e Type 507 as a seven-step vertical-posi 
tion switc wit 50-volt steps of — 150v, — 100 v,
— 50 v, 0, +50 v, +100 v and +150 v. A sep 
arate two-position switc selects eit er 50-volt
steps or continuously variable adjustment.
External Voltmeter Connections
Terminals are provided for a ig -impedance
(5000Ω/v) de voltmeter, permitting vertical cali 
bration w en using t e variable positioning.
GENERAL DESCRIPTION — TYPE 507
1-1

Signal Delay
Two standard UHF connectors are provided on
t e rear of t e instrument for insertion of an
external lengt of delay cable into t e vertical 
input signal circuit. C oice of t e appropriate
lengt and type of cable is at t e discretion of
t e user; no delay cable is furnis ed wit t e
instrument. A signal delay permits t e sweep to
be triggered and under way before t e signal is
applied to t e vertical deflection plates.
SWEEP CIRCUIT
Type
Triggered, ard-tube bootstrap sweep circuit
wit inverter to produce balanced deflection.
Rates
An eleven-position switc selects rates of .02,
.05, .1, .2, .5, 1, 2, 5, 10, 20 and 50 MICRO-
SECONDS/CM, wit a maximum displacement
error of 2 percent over t e center 8 cm of t e
10-cm sweep lengt .
Sweep Starting Time
T e orizontal sweep starts approximately
100-m/zsec after t e signal or triggering pulse
arrives at t e rear-panel connector. An inserted
signal delay of approximately 150 m µ sec permits
t e sweep to be triggered and under way before
t e signal is applied to t e vertical deflection
plates.
Duty Cycle Limitation
A duty-cycle limiting control automatically
limits t e duty cycle of t e sweep circuit to about
10 percent to avoid exceeding t e dissipation
limits of some of t e circuit components. T e
limiting system serves purely a protective func 
tion and does not provide a frequency dividing
operation.
T e following table s ows t e maximum per 
missible repetition rate for eac of t e avail 
able sweep times per centimeter.
SWEEP TIME
MAXIMUM
REPETITION RATE
50 µ sec/cm 600 c/s
20 µ sec/cm
1.5 kc
10 µ sec/cm
3 kc
5 µ sec/cm
6 kc
2 µ sec/cm
10 kc
1 µ sec/cm
20 kc
.5 µ sec/cm 50 kc
.2 µ sec/cm
50 kc
.1 µ sec/cm
50 kc
.05 µ sec/ cm
50 kc
.02 µ sec/cm
50 kc
Triggering
A triggering p ase-inverter amplifier in con 
junction wit a selector switc permits t e sweep
circuit to be triggered from eit er positive- or
negative-going portions of t e observed signal,
or from positive or negative triggers from an
external source. A trigger voltage range of 100
volts to 3000 volts amplitude will be adequate
for stable triggering. T e MARKER position on
t e selector switc must be used w en time
markers are desired.
Sweep Mode
A two-position switc provides for eit er re 
petitive or single-sweep operation. W en t e
switc is in t e single-sweep position, pressing
t e RESET button arms t e sweep circuit. T e
sweep can t en be triggered internally, by MAN 
UAL TRIGGER, or by an external trigger. T e
1-2 GENERAL DESCRIPTION — TYPE 507

MANUAL TRIGGER switc is primarily for p oto- t e calibrated vertical position lines, to create,
grap ing a zero reference line and any or all of in effect, a parallax-free graticule.
POWER SUPPLIES
Cat ode-Ray Tube Accelerating Voltage
An oil-sealed supply of t e a-f oscillator type
provides 24 kv (+20 kv and — 4 kv) for t e ac 
celerating potentials. T e — 4-kv supply is reg 
ulated to compensate for load c anges and line 
voltage c anges.
Low-Voltage Supply
A separate power unit provides regulated d c
voltages for t e indicator unit of +750, +475,
+225 and — 250 volts. T e unit also provides
an unregulated voltage of +360 volts for t e
oscillator in t e ig -voltage supply for t e c rt
circuit.
Power Requirements
600 watts at 117 volts. Voltage range 105-125
or 210-250 volts, 60-cycle, single-p ase ac. Two
primary circuit fuses are provided for protection
against sustained over-load conditions.
MISCELLANEOUS
Cat ode Ray Tube
A Type T507P ca ode-ray tube wit P11 p os 
p or is furnis ed wit t e Type 507 unless an 
ot er p osp or is specified.
Construction
Contained in two separate units of convenient
size, normally mounted on a Tektronix Type
500A Scope-Mobile. T e anodized c assis and
t e blue wrinkle-finis ed cabinets are made of
an aluminum alloy. P oto-etc ed anodized pan
els are employed.
Dimensions
Indicator unit: 16-¾" ig , 13" wide, 23-
¾" deep.
Power unit: 10 ½" ig , 13" wide, 17½"deep.
Weig t
Indicator unit ................................................ 50 lbs.
Power Unit ................................................. 39 lbs.
Type 500A Scope-Mobile .......................... 35 lbs.
FUNCTIONS OF CONTROLS AND CONNECTORS
6.3V 1A. AC
Tip jack from eater bus.
SCALE ILLUM.
Variable resistor controlling brig tness of lamps illuminating graticule over
face of cat ode-ray tube.
ASTIGMATISM
Potentiometer controlling t e voltage at t e astigmatism anode of t e cat 
ode-ray tube. Proper setting of t e voltage at t is anode, wit respect to
t e deflection plates, permits t e spot to be focused s arply in bot dimen 
sions simultaneously.
INTENSITY
Potentiometer controlling de grid voltage of t e cat ode-ray tube and t ere 
by t e brig tness of t e trace.
FOCUS
Potentiometer controlling t e voltage applied to t e focusing anode of t e
cat ode-ray tube for focusing t e trace.
GENERAL DESCRIPTION — TYPE 507
1-3

HORIZONTAL
POSITION
Twin differentially-connected potentiometer controlling average potential of
cat ode-ray tube orizontal deflection plates, t ereby adjusting orizontal
position of sweep.
SWEEP MODE
Two-position toggle switc to select eit er repetitive or single-sweep opera 
tion.
RESET
Button-switc arms t e sweep circuit w en t e SWEEP MODE switc is in t e
SINGLE SWEEP position. T e READY lig t indicates t at a single sweep will
be produced upon reception of a trigger pulse from t e signal to be ob 
served (or p otograp ed), from an external trigger source, or from t e man 
ual-trigger circuit (obtained by depressing t e MANUAL TRIGGER switc ).
STABILITY
Potentiometer controlling grid bias of negative multivibrator tube. Deter 
mines optimum point of triggering.
MICROSECONDS/CM
Gang switc controlling sweep duration and sweep rate. Selects appropri 
ate multivibrator pulse lengt , and sweep generator c arging capacitor and
resistor. Switc also selects TIME MARKERS for convenient calibration of t e
sweep.
TRIGGER SELECTOR
Switc selecting source and polarity of sweep-triggering voltage.
MANUAL TRIGGER Button-switc provides manually-controlled trigger for sweep generator.
MANUAL TRIP PULSE
Button-switc provides pulse of approximately 700 volts amplitude and 5
µsec. widt at TRIP PULSE OUT connector on rear panel of instrument.
VERTICAL
ATTENUATOR
SIGNAL MODE
Switc selects percentage of input-signal voltage applied to vertical deflec 
tion plates.
T ree-position switc reverses deflection-plate polarity wit respect to signal
being observed. T e center position on t e switc connects t e output of t e
Time-Mark Genrator to t e vertical deflection plates.
VARIABLE DEFLECTION Switc connects arm of VARIABLE positioning control to EXTERNAL VOLT 
SENSITIVITY MONITOR METER connectors on front panel of instrument to monitor t e variable d c
positioning voltage. Polarity of voltage may be reversed.
POSITIONING
50 VOLT STEPS
Seven-position switc to control voltage at cat ode-ray tube vertical deflec 
tion plates in 50-volt steps. Eac position of t e switc causes t e beam to
s ift approximately 1 centimeter in t e vertical plane. T is switc is con 
nected into t e circuit w en t e toggle switc immediately below it is in t e
50 VOLT STEPS position.
POSITIONING
VARIABLE
Potentiometer controlling average potential of cat ode-ray tube vertical
deflection plates, providing continuous adjustment of vertical position of
beam. T is control is connected into t e circuit w en t e toggle switc
immediately below it is in t e VARIABLE position.
50 VOLT STEPS
VARIABLE
Toggle switc determines w et er vertical positioning is continuously variable
or in 50-volt steps.
1-4
GENERAL DESCRIPTION — TYPE 507