Tektronix 519 User manual

TYPE 519
| Cathode-Ray
Oscilloscope
| | OPERATING INSTRUCTIONS
TEKTRONIX, INC.
PO Box 500 Beaverton, Oregon .

Specifications
Section
1
General information
The Tektronix Type 519 Oscilloscope is a
wide-band laboratory type instrument designed
expressly for the observation and measurement
of
high-frequency
phenomena.
Fast
linear
sweeps, high crt accelerating potential, high
sensitivity, wide-band trigger system, and
extreme bandwidth permit single-shot photo-
graphic
recording
of
fractional
nanosecond
signals. An internal delay line in the vertical
channel of the instrument eliminates the need
for adjusting cable lengths. Since the length
of the delay line remains constant, the band-
width of the Type 519 also remains constant.
The Type 519 incorporates an adjustable
repetition rate fast-rise pulse generator and
a fast-rise calibration-step generator which
can
supply
waveforms
to
check
the
calibration
of
the
oscilloscope
itself
or
drive
external
devices.
These
generators
meet
most
require-
ments to complete a test setup. |
VERTICAL-DEFLECTION SYSTEM
Vertical Deflection Factor--With Type T519A
CRT, nominally 10 volts per cm. ,
Passband--With Type T519A CRT, dc to l
gigacycle* (3db down). .
Risetime--With
Type
519A
CRT,
less
than
0.35
nanosecond.
Input Impedance--125 ohms.
Maximum
Allowable
Input
Power
to
Vertical
Channel--1.8
watts
(+or-
15
volts
dcor
rms).
Maximum Allowable Peak Signal Amplitude--
+or- 100 volts.
Internal Signal Delay--45 nanoseconds, fixed.
Voltage
Standing
Wave
Ratio--Nominally
1,2:1
from dc to 1 gigacycle.”*
*Gigacycle = 10” cps.
T
|
Specifications
-
Type
519
TRIGGER
Triggering Signal Sources--Internal from +or-
applied signals, internal from the Rate Gen-
erator, internal from the Calibration-Step
Generator, and External.
External
Triggering
Signal
Requirements--
Pulse
amplitude:
20
millivolts.
Pulse
dura-
tion:
1
nanosecond
or
ionger.
Maximum
permissible
external
triggering
signal:
+or-
10
volts
peak.
Internal
Triggering
Signal
Requirements
-
-Pulse
amplitude:
sufficient
signal
to
‘produce
a
2
trace-width
deflection
on
the
screen.
Dura-
tion:
1
nanosecond
or
longer.
Repetition
rate:
O.to
1
gigacycle.
Countdown--Triggering
circuits
count
down
from
triggering
signal
frequencies
higher
than
400
kc.
Sine-wave
trigger
requirements:
0.1
mc
to
1000
mc
(1
gc),
20
mv
peak-to-peak
~
external
trigger
input
or
150
mv
peak-to-
peak
signal
to
vertical
input.
Pulse
Amplitude
or
Sync--Single
control
adjusts
pulse
triggering
level
or
high-frequency
sync.
An
additional
control
provides
vernier
sync.
Delay--0
to
35
nanoseconds
sweep-start
delay.
Permits
sweep
to
display
a
selected
time
interval.
TIME BASE.
Sweep
Rates--Nine
ranges:
2,
5,
10,
20,
50,
100,
200,
500,
and
1000
nanoseconds
(1
microsecond)
per
centimeter,
Accuracy--Typically
within
2%
of
indicated
rate
on
all
ranges
except
the
2
nanosecond
range which
is
within
3%.
These
tolerances
apply
to
all
ranges
except
for the
first
2
nanoseconds
or
2
mm
(whichever
is
larger)
portion
of
any
of
the
above
rates.
Single
-
Sweep--Normal
or
single
sweeps
selected
by
front
panel
switch
and
reset
by
push-button.
Page l

+ Trigger Output--1-volt into 50 ohms upon
triggering.
Delayed +Gate--l-volt pulse into 50 ohms at
start of sweep; hence, time-dependent upon
setting of sweep-delay control.
RATE GENERATOR
Risetime--Less than 0.8 nanosecond.
Pulse Repetition Rate--3 pps to 30 kc, con-
tinuously variable.
Pulse Duration--10 nanoseconds.
Output Impedance--50 ohms.
Amplitude--Approximately +15 volts.
CALIBRATION-STEP GENERATOR
Risetime~-approximately 0.1 nanosecond.
Step Repetition Rate-- Adjustable 250 to 1000 cps,
normally operated at reed-switch resonant
frequency near 750 cps.
Output Impedance--125 ohms.
Amplitude--Into 125 ohms, 0 to 10 volts. Into
50 ohms through T125/T50 adapter, O to
1 volt. Voltages applied to both impedances
are continuously variable and calibrated.
Uncalibrated voltages up to 50 volts into 1252.
Polarity--The output polarity can be selecte"
by a front-panel switch.
CATH ODE-RAY TUBE
Type--Tol9A
Phosphors--Type P11 phosphor standard (rec-
ommended for single - shot photographic
recording of fastest sweep rate), Other
phosphors available on special request.
Usable Viewing Area--Two centimeters, ver-
tical, six centimeters horizontal.
Accelerating Voltage--24 kv.
Spot Diameter--0.004 inch at normal intensity.
Page 2
Deflection--Electrostatic. Traveling-wave ver-
tical deflection system with conventional hori-
zontal deflection plates.
CONSTRUCTION AND POWER
REQUIREMENTS
Construction -- single - unit construction with
light-weight aluminum-alloy chassis and four-_
piece vinyl-finish cabinet. Side panels, top
and bottom panels are separately removable.
Ventilation--Filtered forced air with protective
thermal cut-out insures safe operating temp-
eratures.
Dimensions -- Approximately 22-1/4" high,
14-3/4" wide, and 25-1/4" long.
Net Weight--Approximately 99 pounds.
- Power Requirements--105 to 125 or 210 to
250 volts, 50 to 60 cycles, 650 watts.
ACCESSORIES
1 -- 1252 Termination (017 -007)
1 -- 1252 Adapter T50/T125 (017-008)
2--1252 Insertion Units (017-013)
1 -- 1252 Adapter N50/N125 (017-015)
1 -- 1252 Adapter T50/N125 (017-017)
1 -- 1252 Coupling Capacitor (017-018)
1 -- 1252 1KMC Ringing Crt (017-019)
1 -- 1252 1 nsec Delay Cable (017-507)
1 -- 1252 2 nsec Delay Cable (017-508) ©
1 -- 1252 5nsecDelay Cable (017-509)
1 -- 1252 10nsec Delay Cable (017-510)
1 -- Set of spare miscellaneous cable connector
parts consisting of:
Double Button Assy. (017-032)
Panel Adapter Assy. (017-033)
1252 Cable Connector (017 -035)
Specifications - Type 519 T

2 Spare Reed Switches (260-362) 1 -- 3-conductor Power Cord (161-010)
1 -- Viewing Hood (includes attached: bezel) 1 -- Power Cord Adapter (013-013)
1 -- Accessory Box
Introduction
1 -- Instruction Manual
Operating Information
Section 2
important to have an understanding of the
operation of each control and its function,
The Type 519 Oscilloscope is a high sweep This section of the Operator's Manual is intended
rate laboratory instrument designed for observ- to provide this understanding and other basic
ing, measuring, and photographically recording information. A brief description of each of
phenomena in the nanosecond (millimicrosecond) the front-panel controls follows. Front-panel
region, However, before the instrument can lettering is shown in Fig. 2-1.
be successfully applied in actual use, it is
SCALE ILLUM.
ASTIGMATISM
INTENSITY
FOCUS
Graticule
Control
NANOSEC/CM
DELAY
NORMAL-SINGLE
SWEEP
CYCLES/SEC
‘MULTIPLIER
FUNCTION OF CONTROLS
CRT
Adjusts the brightness of the graticule markings.
Used in conjunction with the FOCUS control to obtain a round spot
and a sharply focused trace.
Adjusts the brightness of the trace.
‘Used in conjunction with the ASTIGMATISM control to focus the
oscilloscope display.
A knurled knob located below the center of the graticule permits
graticule to be moved down when not used.
TIME BASE
Selects the time-base rates.
Sets the delay time duration. Delays start of sweep with respect to
trigger signal input.-
Selects either normal or single-sweep operation.
RATE GENERATOR
Selects the significant figures for the RATE GENERATOR output
frequency.
Multiplier for the CYCLES/SEC control. Should be set to OFF position |
when Rate Generator is not being used.
Operating Information - Type 519 Page 3

RANGE
VARIABLE
VOLTS
POLARITY
REED SWITCH
DRIVE
FREQUENCY
PULSE AMPLITUDE
OR SYNC*
VERNIER SYNC
FUNCTION*
G AIN*
TRIGGER SOURCE
CALIBRATION-STEP GENERATOR
Selects either of two full-scale amplitudes of the calibrator step,
a variable pulse amplitude, or a standby condition. Should be set
to STANDBY position when Calibration-Step Generator is not being
used,
Permits the step waveform to be preset to an arbitrary desired
amplitude up to about 50 volts.
Sets the output voltage amplitude of the calibration-step waveform.
Selects either positive- or negative-going output step waveform.
Adjusts reed-switch magnetic excitation or permits single closure.
Controls frequency of the reed-switch magnetic excitation to reduce
multiple contact bounces.
TRIGGER
Rejects triggers below selected amplitude or adjusts synchronization.
Used in conjunction with PULSE AMPLITUDE or SYNC control to
synchronize the sweep.
Permits choices of triggered or synchronized displays, depending
upon nature of input signals.
Selects proper gain for the triggering signal.
Selects the triggering signal source and polarity.
*Also see TRIGGER OPERATION section of front-panel, Fig. 2-1.
VERTICAL
AXIS ROTATION
HORIZONTAL
DIM ADJ.
ON ©
Page 4
POSITIONING
Adjusts the vertical position of the trace.
Aligns the trace parallel to the horizontal centerline.
Adjusts the horizontal position of the trace.
POWER
Used to adjust brightness of adjacent pilot light after 45 seconds
warm-up.
Main power switch.
Operating Information - Type 519 T

PRELIMINARY INSTRUCTIONS
Cooling
A blower maintains safe operating temp-
erature in the Type 519 Oscilloscope by drawing
air
through
a
filter
and
circulating
it
over
the
components.
Therefore,
the
instrument
must be placed so that the air intake and
cabinet ventilating holes are not blocked. The
air filter must be kept clean to permit adequate
air
flow.
A thermal cutout switch will disconnect the
dc power if air flow is restricted or ambient
temperature
is
too
high.
DC
power
will
return
when the temperature drops to a safe value.
The pilot lamp will increase to full brightness
in event of loss of dc power. The blower
continues to cool the interior and reduces
the time the thermal switch remains open.
Power Requirements
_ The regulated power supplies in the Type
- 519 Oscilloscope will operate with line vol-
tages from 105 to 125 volts (117 nominal)
or from 210 to 250 volts (234 nominal), The
line voltage for which your instrument is
wired at the factory is indicated on a metal
tag fastened to the rear panel near the power
receptacle, Power wiring may be changed
for either 117- or 234-volt operation in com-
pliance with the information given in Fig. 2-2.
The power transformer is wound with two
117-volt primaries which can be connected
in parallel for 117-volt operation or in series
for 234-volt operation. Since the blower motor
is connected across only one of the trans-
former primaries, no change in the motor lead
connections is required. When power wiring
is changed, the voltage indicated on the metal
tag should be covered with another tag which
conforms to the new operating voltage.
For maximum dependability and long life,
the line voltage applied to the Type 519 Oscillo-
scope should be near the design center (117 7
or 234 volts). If the line voltage exceeds
the operating limits or has a poor waveform.
(distorted sine-wave peaks), unstable power
supply operation may result. Observe for proper
line voltage and waveform before checking
for other causes of unstable operation.
T Operating Information - Type 519
Fuse Requirements
. When the Type 519 Oscilloscope is con-
nected for 117-volt operation, use a 7-amp
slow-blowing type fuse. When the instrument
is connected for 234-volt operation, use a
4-amp slow-blowing type fuse.
Time Delay
A time delay relay used in the Type 519
delays. operation of the instrument for approx-
imately 45 seconds after the power switch
is operated. The relay allows a brief tube-
warmup period before the dc operating voltages
are applied. When the ac-power pilot light
dims, the instrument is ready for use.
If the ac power is interrupted for only an
instant, the normal 45-second delay will occur
before the instrument returns to full operation.
Dim Adjustment
The DIM ADJ. control is a screwdriver
adjustment which controls the brightness of
the ac-power pilot light after the 45-second
delay period. The control may be adjusted
to any desired setting. Normally, it is adjusted
to a setting which will reduce glare from
the pilot light when waveform observations
are being made in a darkened room.
FIRST-TIME OPERATION
To place the Type 519 in operation for the
first time, the following procedure is suggested:
1. Set the front-panel controls as follows:
POWER Off
DIM ADJ. Centered
FOCUS Centered
INTENSITY Fully counterclockwise
ASTIGMATISM Centered
SCALE ILLUM. Centered
DELAY Min.
NANOSEC/CM rs)
Page 5

MULTIPLIER X1000
CYCLES/SEC 10
CALIBRATION- Standby
STEP GENERATOR
controls
TRIGGER SOURCE RATE GEN,
GAIN , NORMAL
FUNCTION PULSE
VERNIER SYNC centered
PULSE AMPLI-
TUDE or SYNC
Fully counterclockwise
VERTICAL Centered
HORIZONTAL Fully clockwise
2. Connect the power cord to the rear of .
the instrument and to the source of power.
The line voltage for which the instrument
is wired at the factory is indicated near
the power cord receptacle.
3. Set the POWER switch to ON.
4, Allow about .45 seconds for the pilot lamp
to suddenly dim , indicating that dc-operating
voltages are applied and the instrument
is ready for use.
5. Advance the INTENSITY control until a
visible spot appears near the left center
of the screen.
CAUTION
Do not turn the intensity so high
that a bright glow surrounds the
spot. Excessive undeflected bright-
ness may damage the screen in a
few seconds.
6. Adjust the FOCUS and ASTIGMATISM con-
trols in conjunction with each other to
produce a small round spot.
7. Advance the PULSE AMPLITUDE or SYNC
control fully clockwise to obtain a hori-
zontal sweep trace across the screen.
Readjust the INTENSITY control for suitable
trace brightness.
Page 6
8. Rotate the HORIZONTAL positioning control
to position the start of the trace at the left
side of the graticule.
9, Adjust the AXIS ROTATION control until
the trace is parallel to the horizontal
centerline of the graticule.
10. Connect a T50/N125 adapter to the +RATE
902 connector so that the 50-ohm fittings
match,
ll. Connect a 2-nsec 125-ohm cable from the
125-ohm end of the adapter to the SIGNAL
125Q connector.
12. Rotate the PULSE AMPLITUDE or SYNC
control slowly counterclockwise until a
stable display of the Rate Generator pulse
is obtained. Center the waveform vertically
using the VERTICAL positioning control.
13. Adjust the FOCUS, INTENSITY, and ASTIG-
MATISM controls until a sharp trace with
adequate intensity is obtained. These con-
trols are slightly interdependent and will
require readjustment to obtain the best
trace.
An external signal and/or trigger may now
be applied to the input connectors, If external
triggers are used, set the TRIGGER SOURCE
switch to+ or - EXT.
CRT CONTROLS AND GRATICULE
Intensity
The INTENSITY control is used to adjust
the brightness of the oscilloscope display.
Thus, compensation can be made for changes
in brightness resulting from changes in the
triggering rate or time-base rate. The INTEN-
SITY control is rotated clockwise to increase
brightness and counterclockwise to decrease
brightness. Care must be taken when using
the INTENSITY control that the brightness is
not turned up to the point where the phosphor
on the face of the cathode-ray tube (crt) becomes
permanently damaged. The intensity of the
beam should never be turned up to the point
where a bright halo forms around a stationary
spot.
Operating Information - Type 519 T

Focus and Astigmatism
The FOCUS and ASTIGMATISM controls
operate collectively to permit a sharp, clearly
defined spot or trace to be obtained. The
proper setting of the ASTIGMATISM control
is obtained by rotating the FOCUS control
fully clockwise, setting the PULSE AMPLITUDE
or SYNC control fully counterclockwise, and
setting the INTENSITY control high enough so
the spot is visible (it may be necessary to
adjust the POSITIONING controls), Then adjust
the ASTIGMATISM control to obtain the most
circular spot possible. The FOCUS control
is then adjusted to reduce the spot diameter
as much as possible. This method of spot
adjustment is made with no input signal applied ©
to the SIGNAL 125 input connector. Also,
the ambient light in the room should be kept
low or the viewing hood should be used so
the spot can be observed at a low intensity
level.
Another method for adjusting the spot size —
would be to couple a 10-volt step waveform
from either the RATE GENERATOR or. the
CALIBRATION-STEP GENERATOR to the SIG- |
NAL 12592 connector. When the step waveform
is displayed on the screen, the FOCUS control
is adjusted to narrow the trace during the
rising portion of the waveform. The ASTIG-
MATISM control, is used to narrow the trace
along the horizontal portion of the same wave-
form. Since the two controls interact, repeat
the procedure to obtain a sharply-defined trace
in both the vertical and horizontal direction.
Graticule
The disappearing graticule used withthe Type
519 Oscilloscope is accurately marked with 6
horizontal and 2 vertical 1-centimeter divisions.
The markings on the horizontal centerline are
9 millimeters apart; those on the vertical
centerline are 2 millimeters apart. The
graticule markings allow time and voltage
measurements to be made from the oscillo-
scope screen.
To make the graticule disappear for a clear
view of the screen, loosen the knurled knob
located just below the graticule and slide it
downward the full length of the slot. Tighten
the knob. To make the graticule reappear,
reverse the process.
T Operating Information - Type 519
The graticule cover and mask assembly is
held securely in place by four slotted graticule
nuts and is provided with hinge fittings for
mounting the viewing hood. In addition, the
hinge fittings allow quick removal of the viewing
hood so that a Tektronix Model C12 or Model
C19 camera may be mounted. The Model C19
camera is especially designed to photograph
the fast sweeps of the Type 519 Oscilloscope,
When the camera is not being used, it can
be unlatched and swung away from the crt
screen.
Graticule IIlumination
The graticule is illuminated by two lamps
located at the top edge of the graticule. The
SCALE ILLUM,. control, located below the
oscilloscope screen, is rotated clockwise to
increase the illumination of the graticule mark-
ings and counterclockwise to decrease the
illumination.
Camera Jack
A camera jack, marked 6.3V CAMERA, pro-
vides a 6.3-volt source for use with the Type
C19 camera. When the camera plug is inserted
in the jack, the SCALE ILLUM control and
oscilloscope graticule lights are automatically
disconnected. The 6.3-volt source is utilized
by the camera to project a virtual image
graticule on the face of the crt. During pro-
jection of the image graticule, the oscilloscope
graticule should be dropped out of view.
POSITIONING
Two controls, VERTICAL and HORIZONTAL,
are used to allow the trace to be positioned
to the desired point on the oscilloscope screen.
A third positioning control, AXIS ROTATION,
is used to align the trace with the horizontal
centerline of the graticule.
The VERTICAL position control has suf-
ficient range to allow the trace to be positioned
completely off the top or bottom of the screen
or to any intermediate point. The trace moves
up when the control is rotated clockwise and
down when the control is rotated counter-
clockwise.
The HORIZONTAL position control causes
. the trace to move to the right when it is
rotated in the clockwise direction and to the
Page7

left when it is rotated counterclockwise. The
total horizontal positioning range of the control
_is about 2 centimeters.
The AXIS ROTATION control is a screw-
driver adjustment located between the VER-
TICAL and HORIZONTAL controls. This adjust-
ment permits the trace to be rotated about an
axis through the center of the screen. The
control is adjusted to align the trace parallel
to the horizontal centerline.
VERTICAL-DEFLECTION SYSTEM
Input Signal Connection
The electrical signal to be observed is
applied externally through a 125-ohm coaxial
cable to the SIGNAL 1252 connector. The
Signal passes internally first through atrigger-
energy takeoff, then through a 45-nsec delay
cable to the distributed vertical deflection
plates of the crt. The signal causes the spot
to be deflected vertically. The spot traces out
the signal waveform on the screen as the spot
is deflected horizontally by the horizontal sweep
circuits. The vertical size of the displayed
waveform is adjusted to a suitable amplitude
by inserting external attenuators or an amplifier
in series with the signal-carrying cable. Or,
if the CALIBRATION-STEP GENERATOR is
being used as the signal source, the vertical
amplitude of the waveform can be adjusted
by means of the CALIBRATION-STEP GEN-
ERATOR front-pane! controls.
The vertical sensitivity of the Type 519
Oscilloscope is the same as the sensitivity
of the crt mounted.in the instrument. Each
crt for the Type 519 is measured for sensitivity
and risetime at the factory. These measure-
ments are then clearly recorded on the crt
face mask. The sensitivity measurement can
be checked at any time by using the CALI-
BRATION-STEP GENERATOR.
To check the measurement, connect a 125-
ohm cable from the OUTPUT 125Q connector
to the SIGNAL 125 connector. Set the (CALI-
BRATION-STEP GENERATOR) RANGE switch
to 10V TO 125Q and rotate the VOLTS control
to 10.00. Adjust the oscilloscope front-panel
controls for a stable presentation of the step
waveform. Rotate the VOLTS control counter-
clockwise until that portion of the waveform
located 2 nsec after the rise is exactly one
Page 8
centimeter high. The exact vertical sensitivity
in volts per centimeter can now be readdirectly
from the VOLTS dial.
For example, if the VOLTS dial shows a
. reading of 8.70, the vertical deflection factor
is 8.7 volts per centimeter.
When connecting the oscilloscope to any
signal source, the connections should be made
directly through 125-ohm cables or through
suitable impedance matching devices to the
SIGNAL 125Q connector. If the signal amplitude
is too great, it will be necessary to attenuate
the signal to a usable level before applying it
to the SIGNAL 125 connector. This can be
done by inserting a 125Q attenuator (or known
attenuation factor) between the signal source
and the SIGNAL 125Q connector. Attenuators
may be used individually or may be " stacked"
(connected in series).
If the signal amplitude is too low to produce
sufficient vertical deflection, an external ampli-
fier can be inserted between the signal source
and the SIGNAL 1252 connector. However, if
the amplifier does not provide the correct
‘input and output impedance, or has limited
bandwidth, signal waveform errors may result.
In addition, if the amplifier stages do not
operate linearly the signal will not be repro-
duced faithfully on the crt.
In general, to obtain an accurate waveform
display and to prevent unwanted reflection of
high-frequency waveforms or of fast-rise
pulses, all cables should be terminated in
their characteristic impedances.
Delaying the Signal +
The Type 519 Oscilloscope contains a fixed
signal-delay line which permits the sweep to
be well under way before displaying the leading
edge of an input signal. By means of the fixed
signal-delay line, the input signal is purposely
delayed 45 nanoseconds before arriving at the
vertical deflection plates.’ This amount of delay
allows sufficient time for the trigger circuits
to process the trigger signal and start the sweep.
The DELAY control delays the start of the
sweep from O to 35 nanoseconds. Within this
range of time, the DELAY control can be
used to select the display time and thus
apparently position the waveform horizontally
on the screen.
Operating Information - Type 519 T

For triggered sweep operation with exter-
nally-derived
trigger
signals,
the
time
relation
-
ship of the external trigger signal to the input
signal must fall within the adjustment range
of
the
DELAY
control.
If,
for
example,
too
much delay is introduced by using long cables
to couple the trigger signal to the EXTERNAL
TRIGGER 1252 connector, the input signal will
arrive at the vertical deflection plates before
the sweep is triggered. The input waveform,
having arrived early, will not be displayed
on the screen. To offset external delay of
this type, shorten the external trigger cable,
if possible. If this is not possible, cable can
be added in series with the signal-carrying
cable, but only at the expense of bandwidth.
The delay provided by a typical 125-ohm
cable such as one of the RG-63/U cables
(shipped with the oscilloscope) is approximately
1.2 nsec per foot. If any portion of the input
waveform is displayed on the screen, the
amount of delay which must be added or sub-
tracted to display the waveform properly on
the screen can be determined by the sweep
rate and the number of divisions that the
display must be moved. If the display must
be moved to the right, less delay in the trigger
cable is required.
When 30 megacycle or higher repetition-
rate signals of identical shape and amplitude
are being displayed, the DELAY control will
always permit display of the complete wave-
form. If all waveforms are uniform, it is not
important which is displayed. The internal
delay line may be bypassed by direct con-
nections to the crt if desired, at the sacrifice
of internal triggering from the signal.
TRIGGER
Triggering (or Synchronizing) the Sweep
In most cases it is desirable for a repetitive
waveform to appear stationary on the oscillo-
scope screen so that the characteristics of
the waveform can be examined in detail. As
a necessary condition for this type of display,
the start of the horizontal sweep must be related
to the input waveform. In the Type 519 Oscillo-
scope this is accomplished either by triggering
or synchronizing the sweep with the displayed
waveform
or
with
another
waveform
bearing
a
definite
time
relationship
to
the
displaycdwave-
T
Operating
Information
-
Type
519
form. More information about the horizontal
sweep is given in the Time Base portion of
this manual.
The following paragraphs outline the various
triggering controls in the TRIGGER section ~
on the front panel, in the order normally
encountered. Briefly, the order would be to
set the TRIGGER SOURCE switch first, GAIN
switch second, and FUNCTION switch third.
Lastly, the PULSE AMPLITUDE or SYNC con-
trol is adjusted to obtain a stable display for
"triggered" sweep operation. For " synchro-
nized" sweep operation , both the PULSE AMPLI-
TUDE or SYNC and VERNIER SYNC controls
may be adjusted to obtain a stable display.
Selecting the Trigger Source
The sweep can be either triggered or syn-
chronized (depending upon the setting of the
FUNCTION switch) from the following wave-
form sources: (1) displayed waveform, (2)
externally-derived waveform, (3) Calibration-
Step Generator waveform, or (4) Rate Generator
waveform. Trigger source selection is made
by means of the TRIGGER SOURCE switch.
Each trigger source has advantages for certain
applications.
(1) Displayed Waveform. Triggering from
the displayed waveform is the method most
commonly used. The displayed waveform to be
used as a trigger is selected whenthe TRIGGER
SOURCE switch is set to either the +INT.
or -INT. position. Internal triggering is con-
venient
since
no
external
triggering
signal
connections are required. A displayed pulse
waveform that produces at least two trace-
widths
of
vertical
deflection
is
sufficient
for
reliable triggering.
(2) Externally-Derived Waveform. Totrigger
the sweep from some external waveform, con-
nect
the triggering waveform to the EXTERNAL
TRIGGER
1259
input
connector.
The
external
triggering waveform must be at least 20 milli-
volts in amplitude, with a time duration of
1 nanosecond or more. Themaximum amplitude
should not exceed +or- 2 volts peak except when
the GAIN switch is set to X.2. In the X.2
position the external trigger should not exceed
+or-
10
volts.
Larger
triggers
may
be
atten-
uated externally. When an external triggering
Page 9

signal is connected to the EXTERNAL TRIGGER
125 connector, the TRIGGER SOURCE switch
must be set to either + EXT. or -EXT.
External
triggering
provides
definite
advan-
tages
over
other
methods
of
triggering
in
certain
cases.
With
external
triggering,
the
triggering
signal
usually
remains
constant
in
amplitude
and
shape
(depending
upon
the
source).
Also,
time
and
phase
relationships
betwen
waveforms
at
different
points
in
the
circuit
can
be
seen.
If,
for
example,
the
external
triggering
signal
is
derived
from
the
waveform
at
the
input
to
a
device
under
test
,it
is
possible
to
observe
the
shaping,
jitter,
amplification,
or
delay
of
the
signal
through
the
device
without
resetting
the
oscilloscope
triggering
controls
for
each
observation.
(3) Calibration-Step Generator Waveform.
In the +CAL or -CAL. positions of the TRIG-
GER SOURCE switch, the triggering signal is
obtained internally from the CALIBRATION-
STEP GENERATOR. The signal is derived
through the use of a trigger pickoff circuit
inserted near the termination of the generator.
Therefore, it is necessary to keep in mind
that the controls which set the output amplitude
of the CALIBRATION-STEP GENERATOR also
affect the amplitude of the triggering signal
available at the +CAL. and -CAL. positions
of the TRIGGER SOURCE switch. These two
positions of the TRIGGER SOURCE switch
are used when observing a waveform which
is related to the output waveform of the CALI-
‘BRATION - STEP GENERATOR. It is then
possible to observe and actually measure shap-
ing, jitter, amplification, or delay at any point
in the device under test. In addition, the
requirement for a minimum signal height and
duration can be circumvented.:
(4) Rate Generator Waveform. The RATE
GEN. position of the TRIGGER SOURCE switch
provides triggering signals which can be varied
to cover a continuous repetition-rate range
from 3 cps to 30 kc. These signals can then
be used to trigger the sweep at a known
repetition rate within the above range. To
select the RATE GENERATOR trigger, set
the TRIGGER SOURCE switch to RATE GEN.
Then set the MULTIPLIER switch and CYCLES/
SEC control to the desired repetition rate.
Page 10
Selecting the Trigger Polarity
The horizontal sweep can be triggered on
either the rising (+slope) or falling (-slope)
portion of the triggering waveform as determined
by the position of the TRIGGERSOURCE switch.
In many applications the triggering polarity
is important since triggering on one of the
‘slopes will make it possible to observe the
start.of a pulse in pulse measurement appli-
-cations. If the wrong slope is selected it may
not be possible to observe the desired portion
of the waveform. In many other cases, however,
such as high-frequency repetitive waveforms,
the triggering polarity is not important.
Selecting the Trigger Gain
A four-position GAIN switch permits incom-
ing trigger signals to be attenuated or amplified
as necessary for proper operation of the PULSE
AMPLITUDE or SYNC control. The four gain
settings are: X.2, NORMAL, X5, and X20.
To aid in determining which GAIN switch set-
ting to use for reliable triggering, Table 2-1
‘is included. Additional discussion will be found
in the PULSE AMPLITUDE or SYNC control
description.
Selecting the Trigger Function
Three functions or modes of operation are
provided in the Type 519 Oscilloscope to cover
a wide range of triggering conditions. They
are: PULSE, SYNC, and HF SYNC,
Each of the triggering functions is designed
to provide stable triggering from a certain
type of waveform. For many applications,
however, more than one function will trigger
well. For applications where more than one
function works well, the triggering function
used is simply a matter of choice.
To determine the best trigger function to
use for a particular application, it is best
to have some understanding of all three before
making a selection
Operating Information - Type 519 T:

Table 2-1
TRIGGER » Approximate GAIN Switch Settings
SOURCE ; oo
Switch X.2 NORMAL X5 X20
Setting che
T Always use a
| RATE GENT this setting fd
+or-CAL.* 8v to 50v OV to 25v 0.5v to 8v
+or-EXT. | lv to l0v (peak) | 0.2v to 2v (peak) | 0.1v to 0.5v 0.02v to lv
+or-INT.** | 10v (pulse) to 2v to 20v (pulse) lv to 5v O.lv to 1.5v
100v (pulse)
_ Used for small amplitude triggers up to 200 mc. .
*CALIBRATION-STEP GENERATOR output step amplitudes are listed. Approx-
imately
2.5%
of
the
step
amplitude
is
coupled
to
the
+CAL,
and
-CAL,
positions
of the TRIGGER SOURCE switch.
**Voltage
ranges
of
signals
applied
to
the
SIGNAL
125Q
connector
are
given,
Approximately
12.5%
of
the
signal
amplitude
is
picked
off
and
coupled
to
the
+INT.
and
-INT.
positions
of
the
TRIGGER
SOURCE
switch.
The PULSE function permits choice of a free-
running sweep or a stable sweep which can be
triggered by signals at random or uniform
repetition rates up to 50 mc. The upper
repetition-rate limit varies, depending upon
the regularity of the pulse period. The PULSE
function when used in conjunction with the .
SINGLE SWEEP switch permits photographic
recording of single events at any setting of
the NANOSEC/CM switch.
The SYNC trigger function permits stable
displays of waveforms occurring at a constant
repetition rate up to approximately 200 mc.
To make use of this function, the FUNCTION
switch is placed in the SYNC position. The
PULSE AMPLITUDE or SYNC control is used
as a coarse synchronization control; the
VERNIER SYNC control is used as a fine
synchronization control to "lock in" the wave-
form to be observed.
The HF SYNC trigger function permits the
sweep to be synchronized with high frequency
signals from approximately 100 mc to 2 giga-
cycles. To use the high-frequency synchroni-
zation mode of operation, the FUNCTION switch
T Operating Information - Type 519
is placed in the HF SYNC position. The PULSE
AMPLITUDE or SYNC and the VERNIER SYNC
controls are used in conjunction with each
other to lock the waveform.
Triggering or Synchronizing the Sweep
_ The last controls which are usually operated
in the TRIGGER section of the front panel are
the PULSE AMPLITUDE or SYNC control and
its companion, VERNIER SYNC, These con-
‘trols, as their names imply, are used for two
functions: pulse amplitude selection and syn-
chronization, depending upon the setting of
the FUNCTION switch.
If the FUNCTION switch is set to the PULSE
position, the PULSE AMPLITUDE (or SYNC)
contral is used for triggered sweep operation.
The PULSE AMPLITUDE (or SYNC) control
sets the minimum level at which a trigger can.
initiate the sweep, All triggers below the set
level are rejected. In order for the control
to operate properly within its rotational range,
sufficient amplitude triggers must be available
as explained earlier under Selecting the Trigger
Gain. Triggering on small signals is best
just before the arrow.
Page 11

If the FUNCTION switch is set to either
the SYNC or the HF SYNC positions, the
(PULSE AMPLITUDE or) SYNC control is
used for making the coarse synchronization
adjustment, Final adjustment may be made
with the VERNIER SYNC control. The sweep
repetition rate will synchronize to the same
frequency as the triggering signal or at some
sub-multiple frequency.
In actual operationthe VERNIERSYNC control
is normally set at midrange until the coarse
adjustment is made, then the VERNIER SYNC’
control is adjusted to obtain a stable display.
TIME BASE
Horizontal Sweep
The Type 519 Oscilloscope graphically pre-
sents instantaneous signal voltage versus time.
The signal voltage produces a vertical deflec-
tion of the trace; time is represented through
horizontal deflection. It is necessary for the
spot formed by the electron beam to be deflected
horizontally at a known rate. Withthis condition
any horizontal distance on the screen represents
a definite known period of time. The trace
formed by the deflection of the spot across
the screen is known as the horizontal sweep.
Since the horizontal deflection of the spot
bears a definite relationship to time and provides
the means for making time measurements from
the screen, the horizontal. sweep is also known
as the time base.
The settings of the NANOSEC/CM switch
accurately determine the time-base rate. The
time-base rates of the switch range from 2
nanoseconds per centimeter to 1000 nanoseconds
(1 psec) per centimeter in 9 accurately cali-
brated steps.
Extreme care has been taken in design of
the sweep generator to provide long-term sta-
bility of sweep calibrations and linearity.
Single Sweep Operation
The Type 519 Oscilloscope permits a single-
sweep presentation to be obtained and eliminates
all subsequent sweeps so the signal can be
clearly recorded without confusion resulting
from multiple traces. The single-sweep feature
is selected by placing the NORMAL-SINGLE
Page 12
SWEEP switch in the SINGLE SWEEP position.
The RESET button must be actuated to 'arm!’
the time-base and permit a single-trigger event.
When the FUNCTION switch is placed in
the PULSE position andthe PULSE AMPLITUDE
or SYNC control is set fully clockwise (past
the RECURRENT arrow or line), a single
sweep runs immediately each time the RESET
button is depressed. -
When the PULSE AMPLITUDE or SYNC
control is set for triggered sweep operation,
the single sweep does not occur when the
RESET button is depressed. Instead, the READY
lamp lights to indicate that the sweep is armed
and ready to be triggered. When a _ trigger
is received, the sweep runs once and the
READY light goes out. Each time the RESET
button is depressed the procedure is repeated.
When the FUNCTION switch is placed either
in the SYNC or HF SYNC position, a single
sweep runs immediately each time the RESET
button is depressed regardless of the settings
of the PULSE AMPLITUDE or SYNC control.
Synchroscope Operation
In the usual oscilloscope application, the
Sweep is triggered or synchronized by the
input waveform. However, in some applications
it may be more desirable to reverse the process
and drive an external circuit from the oscillo-
scope. In this 'synchroscope’ application, the
sweep is caused to free run or to be triggered
by the RATE GENERATOR. The output signal
from either the + TRIGGER 502, the DELAYED
+GATE or the +RATE 50 connector is used
to initiate the input waveform (see Fig. 2-3).
The sweep can be made to free run with
any setting of the FUNCTION switch. If the
PULSE position. of the FUNCTION: switch is
used, the PULSE AMPLITUDE or SYNC control
must be rotated fully clockwise past the RECUR-
RENT arrow. The number of free-running
Sweeps per second is determined by the set-.
tings of the NANOSEC/CM switch: (refer to
Table 2-2).
Operating Information - Type 519 T

TABLE 2-2
SWEEP REPETITION
NANOSEC/CM
Switch Settings RATES
(RECURRENT rates)
2 Adjusted to 400 kc
.) 200 kc nominal
10 100 kc"
20 50 kc "
50 20 ke "
100 10ke "
200 Ske "
500 : 2ke "
1000 lke "
In addition to providing the means for ini-
tiating an applied waveform, a recurrent sweep
also provides a convenient reference trace on
the oscilloscope screen without requiring an
input signal. The trace can then be positioned
to any desired point on the oscilloscope screen
or can be used to establish a zero-voltage
reference line.
Delayed Trigger
A delayed triggering pulse can be obtained
from the DELAYED +GATE 50Q9 connector
of the oscilloscope any time from approximately |
0 to 35 nanoseconds after the trigger is accepted.
The trigger pulse bears a fixed relation to
the time of sweep start. The delayed triggering
pulse can be used to initiate action at approxi-
mately the time of sweep start.
RATE GENERATOR
The output pulse from a transistor operating
in the avalanche mode is coupled to the RATE
GEN. position of the TRIGGER SOURCE switch
and to the +RATE 50Q connector. The pulse
risetime is less than0.8 nanosecond, amplitude
is nominally +15 volts, and duration is 10
nanoseconds. Calibration of the RATE GEN-
ERATOR is in cycles per second times a
multiplier. To select a desired rate for trig-
gering the sweep from the RATE GENERATOR
set the TRIGGER SOURCE switch to RATE
GEN. Then set the CYCLES/SEC dial to the
significant figures and the MULTIPLIER dial
to multiply by 1, 10, 100, or 1000 times.
Any frequency between 3 cps and 30 ke can
be selected within an accuracy of LO%.
T Operating Information - Type 519
Since the sweep can be triggered at the
repetition rate set by the RATE GENERATOR
from 3 cps up to 30 kc, this feature can be
used for applications similar to those described
previously under the headings "Selecting the
Trigger Source", and "Synchroscope Opera-
tion". When the RATE GENERATOR is not
used, it can be turned off by placing the MULTI-
PLIER switch in the OFF position.
CALIBRATION-STEP GENERATOR
Step Waveform
Step waveform from the CALIBRATION-STEP
GENERATOR is generated by discharging a
_charged coaxial line into an external load
‘through a magnetically-closed dry-reed switch.
The physical length of the charged line deter-
mines the duration of the output step waveform.
In the Type 519, with no external charge line
added, the step duration is equal to twice
the transit time of the built-in 1.5-nsec charge’
line. Transit time of the charge line is defined
as the time required for a signal to pass from
one end of the line to the other. For the 1.5-
nsec charge line then, the duration of the
output pulse is 3 nsec.
An additional charge line (cable) may be
added to the Charge Line Connector located
next to the Trigger Takeoff (see Fig. 2-4).
When an additional charge line is added, the
Line Charging Network and the Charging Source
Voltage are disconnected. Then they are recon-
nected to the open end of the charge line.
The Line Charging Network performs two
purposes: (1) Reduces effective reed switch
capacitance and (2) provides an energy coupling
source for the charge line.
(1) The reed switch presents a capacitive
load across its contacts just before closure,
at which time the pulse is generated. This
load bleeds off energy from the charge cable
and results in a lower voltage pulse than the
indicated charging voltage. This is minimized
by adding a 1252 terminating resistor and a
large energy source in the form of a capacitor
behind the reed switch. This capacitor is large
enough to supply this energy without loss of
amplitude. The 47-k resistor recharges the
capacitor before the next pulse comes along.
This causes the trailing edge of the pulse to
Page 13

have an rc decay of approximately 0.4 psec
(see Fig. 2-5).
(2) The Line Charging Network provides a
means for coupling the energy source to the
charge line. The energy source is a dc voltage
controlled by the front-panel VARIABLE,
RANGE, VOLTS, and POLARITY controls.
Polarity
Step polarity, either positive or negative,
is controlled by the POLARITY switch. The
polarity of the step is the same as the polarity
of the charge voltage,
Amplitude
Step amplitude is dependent upon the amount
of charging voltage used. The charge voltage
obtained from the charging source is. 2 times
the peak pulse voltage present at the OUTPUT
1252 connector when driving an external 125-
ohm load. The peak pulse voltage reading
is accurately indicated by the settings of the
RANGE and VOLTS control.
When the VOLTS control is set to 10,00
the RANGE switch permits a choice of two
full-scale step amplitudes, 10 volts or 1 volt.
When the RANGE switch is placed in the 10V
(TO 1252) position, 10 volts into a 125-ohm
impedance is obtained. When the RANGE switch
is set in the 1V (TO 50Q) position, a T50/
T125 adapter must be connected to the OUT-
PUT 12592 connector to obtain a l-volt ampli-
tude step into a 50 ohm load.
The scale of the VOLTS control, when used
with either of the two above RANGE switch
positions, indicates the step amplitude. The
VOLTS control is the 0 to 1 multiplier for the
two ranges.
When the RANGE switch is set to the VARI-
ABLE position, the step amplitude may be
preset by the VARIABLE control to any uncali-
brated amplitude from 0 to approximately 50
volts when driving a 125-ohm impedance. To
determine the amplitude of the step for any
setting of the VARIABLE control, apply the
step waveform from the OUTPUT 1259 con-
nector through a 125-ohm cable to the SIGNAL
1252 connector. Measure the amplitude of
the vertical deflection in centimeters and
Adjusting the Drive and Frequency
‘Two convenient front-panel controls, DRIVE
and FREQUENCY, control the movement of the
dry reed switch. These controls are adjusted
in conjunction with each other to cause the
reed to make-and-break contact reliably.
To adjust the two controls, they must first
be preset fully counterclockwise. Then advance
the DRIVE control until the reed vibrates:
(makes. a buzzing sound). Advance the FRE-
QUENCY control until the reed fails to operate
and then rotate the control slightly counter-
clockwise to start the reed operating again.
Rotate the DRIVE control counterclockwise
while rotating the FREQUENCY control back
and forth to find the resonant frequency of the
reed, The resonant frequency is found when the
drive is decreased to a point where the reed
will vibrate in one small rotational area of
the FREQUENCY control range. For optimum
operation the DRIVE and FREQUENCY con-
trols are then adjusted in conjunction with each
other to obtain the most stable waveform at
the resonant frequency of the reed. When adjust-
ing the DRIVE control, use enough drive to get
‘a solid closure of the reed contacts. The
resonant frequency of most reeds is usually
within the range of 700 to 800 cps.
NOTE
To extend the life of the reed
switch when the CALIBRATION-
STEP GENERATOR is not being
used, set the RANGE control to
STANDBY.
ACCESSORIES
A number of accessories are included with
the Type 519 Oscilloscope. Those which require
more information pertaining to their use are
described in this portion of the manual.
(1) 1252 Termination
The 1252 Termination (Fig. 2-6) is supplied
as a replacement for the T519Acrt termination.
The unit can be used to terminate any 125-
multiply the distance measured by the sen- ohm cable, tuned stub, or other similar
sitivity of the oscilloscope. applications.
Page 14 Operating Information - Type 519 T

(2) 125 Adapter T50/T125*
This adapter (Fig. 2-7) is commonly known
as a minimum loss attenuator. Designed to
match a 50-ohm line to a 125-ohm line, the
attenuator presents minimum loss and no re-
flection. It contains a network composed of a
shunt and a series resistor. Though the atten-
uator presents a correct impedance match in
either direction, the insertion loss (43.5%) is
greater than the NSO/N125 adapter which is
described next.
(3) 125 Adapter N50/N125*
Also called an unterminated adapter con-
nector, this accessory (Fig. 2-8) is straight-
thru connector which connects a 50-ohm line
directly to a 125-ohm line. This unit is used
for pulse applications. If a pulse is applied
to the 50-ohm end of the adapter, the pulse
amplitude is 1,425 times greater at the 125-ohm
end thanif it had been terminated with 50 ohms.
Since it is not a constant-impedance unit, it
should not be used for terminating high-fre-
quency continuous-wave signal sources. When
it is used, the abrupt discontinuity inherent in
the unit causes a reflection to occur which may
interfere with the waveform on display unless
certain precautionary measures are taken.
To prevent a reflection from occurring on
the displayed waveform, make the combined
electrical length of the 50-ohm cable and
the adapter equal to or more than T/2, where
T is the length of the pulse to be observed.
This accessory is not generally used to handle
a signal traveling in the reverse direction.
(4) 1252 Adapter T50/N125* —
This adapter is usually called a 50-ohm
termination adapter and the internal circuitry
is shown in Fig. 2-9. In actualusethe 83.3-ohm
resistor is shunted by the 125-ohm input
impedance of the oscilloscope. The combined
resistances present a total shunt impedance of
50-ohms to the signal source.
The adapter is designed to handle pulse or
continuous-wave signals originating from a
50-ohm source. Maximum signal voltages can
then be applied to the input of the Type 519
Oscilloscope with minimum loss.
T Operating Information - Type 519
This pad terminates the 50-ohm system
so no reflections occur at this pad. Any possible
reflections would have to originate at the end
of the vertical deflection system. The vertical
deflection system has 45 nsec of delay before
it is terminated in 125-ohms, therefore any
mismatch reflection would occur 90 nsec from
the start of the pulse. The reflection is relatively
small because the VSWR of the vertical system
is 1.25 or better.
*The letter '"T" in the adapter type means
" Terminated"; "N" means " Not terminated" ,
(5) 1259 Insertion Unit
This unit is a hollow coax connector with
access holes located on each side of the cylinder
to permit small components to be mounted inside.
A snap-on sleeve cover permits adequate shield-
ing of components and minimum discontinuity °
in the line. The unit can be used for making
attenuators, filters, impedance matching cir-
cuits, testing devices, and many other networks.
(6) 12592 Coupling Capacitor
The 1252 Coupling Capacitor connector con-
tains a silvered-ceramic, wafer-type capacitor
connected in series with the inner conductor.
The
conductors are butt-soldered to the capa-
citor (see Fig. 2-10), ,
This unit is normally used for ac-coupling
high-frequency signals with minimum reflec-
tions to the Type 519 Oscilloscope. Low-
frequency signals and dc are blocked. Its
characteristics are:
Coupling Capacitance: 0.01 put, GMV.
Voltage Rating: 400 volts.
Reflection Loss: Negligible
(7) 1252 1 KMC Ringing Circuit
The 1252 1 KMC Ringing Circuit is a Sweep
Calibrator which is used to make periodic
sweep calibration checks of the 2- and 5-
nanosec/cm sweep rates.
To use the Sweep Calibrator, set the CALI-
BRATION-STEP GENERATOR Range switch
to VARIABLE, Rotate the VARIABLE control
Page 15

fully
clockwise.
Adjust,
ifnecessary
,the
DRIVE
and
FREQUENCY
controls
for
stable
reed
operation.
Set
the
POLARITY
switch
to
+,
Connect
a
2-nsec
125-ohm
cable
from
the
OUTPUT
1252
connector
to
the
Sweep
Cali-
brator,
Connect
the
other
end
of
the
Sweep
Calibrator
to
the
SIGNAL
1259
connector.
Set
the
TRIGGER
SOURCE
switch
to
+CAL.
GAIN
switch
to.NORMAL
and
the
FUNCTION
Switch
to
PULSE,
Set the
NANOSEC/CM
switch
to
2.
Adjust
the
PULSE
AMPLITUDE
or
SYNC
control
for
a
stable
display
of
the
ringing
wave-
form.
Use
the
DELAY
control
to
position
the
waveform horizontally. The amplitude of the.
waveform is typically about 0.2 cm to 0.3
cm,
Sweep
timing
is
correct
when
two
cycles
per
centimeter
are
aligned
with
the
graticule
markings,
starting
one
centimeter
from
the
start
of
the
sweep.
If
sweep
timing
is
not
accurate,
remove
the
left-side
panel
from
the
instrument
and
adjust
the
2
nSEC
control
(R732A)
for
a
correctly-timed display.
Set
the
NANOSEC/CM
switch
to
5.
Exactly
five
sine-waves
per
centimeter
should
be
dis-
played
if
sweep-rate
timing
is
correct,
start-
ing
1
cm
from
the
start
of
the
sweep.
If
not,
adjust
the
5
nSEC
control
(R732B)
for
correct
sweep
timing.
(8) 12592 Delay Cables
Different
length
cables
are
supplied
for
use
in
coupling
the
signal
and/or
trigger
to
the
appropriate
input
connectors
on
the
front
panel
of
the
Type
519
Oscilloscope.
The
loss
per
foot
of
cable
when
used
with
the
Type
519
is
0.6
db
at
1
gigacycle.
The
delay
time
marked
on
each
cable
is
the
time
required
for
a
signal
to
travel
from
one
end
of
the
cable
to
the
other.
(9) 1252 Cable Connector Parts
(a) Double Button Assembly. Used for replac-
ing a defective insert in any of the 125-ohm
front-panel connectors or cable connectors.
Page 16
(b) Panel Adapter Assembly. Replacement
for any of the front-panel 125-ohm connectors.
(c) 125 Cable Connector. Replacement for
any of the cable connectors.
(10) Reed Switch
Two spare reed switches are included as
replacements for the reed switch used in the
CALIBRATION-STEP GENERATOR. To replace
the reed switch proceed as follows:
Remove the four mounting screws which hold
the OUTPUT 1259 connector to the front panel.
Grasp the connector and pull straight out from
the front panel to extract the attached coax
tube assembly. The complete assembly is
about 18" long and contains the reed switch
(see Fig. 2-11), Take apart and remove the
' OUTPUT 125Q connector to expose the location -
of the reed switch. Grip the metal end of
the reed switch with long-nosed pliers and
pull the reed switch out.
To install the replacement reed switch,
remove the 125-ohm double button assembly
from the conductor sleeve. Connect the button
center conductor to one end of the reed switch
to serve as a holder. Plug the other end of
the reed switch into the center conductor
located inside the tube. Look through the
small hole in the side of the tube to see
that the switch and conductor are properly
connected. Align the slots inthe connector parts.
Screw the connector fittings together to complete
the assembly, Insert the assembly through the
front panel while holding the OUTPUT 1259
connector in correct upright position (similar
to the position of the flanges of the EXTERNAL
TRIGGER 1252 connector) so the connector
at the far end will match correctly. Mount
the OUTPUT 1259 connector securely to the
front panel with the four screws.
Operating Information - Type 519 T

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TYPE 519 OSCILLOSCOPE
SERIAL ‘
TEKTRONIX. INC... PORTLAND, OREGON, U. 8. A.
Focus
6.3V © CAMERA
INTENSITY
ASTIGMATISM SCALE'ILLUM,
© © @ G
+ TRIGGER
s0n
(:)
DELAYED
*# GATE
5sOn
TIME BASE
DELAY
APPHOX, 0.5 MSEC)
NA&NOSEC /CM
50
MEN: MAX
C a soo
1000
th sect
RESET
READY
(c) NORMAL (gees SINGLE —(¢)—— e
RATE GENERATOR
MULTIPLIER CYCLES/SEC
x MULT.
PULSE AMPLITUDE
VERNIER SYNC
Q
{ RECURRENT]
FUNCTION
SYNC
PULSE HF SYNC
© :
GAIN
NORMAL x5
TRIGGER SOURCE
ata
POSITIONING
VERTICAL HORIZONTAL
. AXIS ROTATION
C — ©
TRIGGER TRIGGER OPERATION
PULSE AMPLITUDE OR SYNC
|. MECURRENT ELYOND ARROW, RECURRENT FoR SYNG
orn HF SYNC ruNction.
€ BEST PULSE SENSITIVITY JUST BEFORK ANROW.
FUNCTION SWITCH
PULSE For SINGLE EVENTS OR REPETITIVE WAVEFORMS
TO APPROXIMATELY SOMC REP RATE,
FOR AEPETITIVE WAVEFORMS TO APPROXIMATELY
SYNC
: 200M MAXIMUM.
HF SYNC. For tooMe To 2 GicacveLes
GAIN SWITCH
NORMAL excert
X.2 FOR SIGNALS EXCEEDING £20 VOLTS OR
EXTERNAL TRIGGERS EXCEEOING fF VOLTS.
xs On X20 FOR SMALL AMPLITUDE TRIGGERS
UP TO LOOMC.
POWER
READY Dim
WHEN DIM ADS. ON
+ RATE
son
- R UT:
CALIBRATION - STEP GENERATOR REED SWITCH INPUTS
oN RETURN TO STANDBY To EXTEND REEO LIFE
DRIVE FREQUENCY
RANGE VOLTS me
tov To Iv To son ¥
125A THAD
rsosT Nas SINGLE
CLOSURE
EXTERNAL
OUTPUT TRIGGER SIGNAL
1250 125 n 1254
VARIABLE POLARITY : ry r r5 rs 7
@) nL) (:) 1O
~ € e € a Ly e
£2V MAX, PEAK ExcerT
IOV MAX PEAK TOXE
TRIGGER GAIN
tt3¥Y MAX OC ON RMS,
S100V MAX, PULSE
= \
-
~)
Fig. 2-1,
The Type 519 Oscilloscope.
P age 17 ‘

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2
i
3 ‘
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"9
3
{
aw
4&
=e
1]
1
117-VOLT
OPERATION’
"
234-VOLT
OPERATION,,
Fig, 2-2. For 117-volt operation terminal 1 of the power transformer (T601) is connected to ter-
“minal 2, and terminal 3 is connected to terminal 4, For 234-volt operation, terminal 2 is connected
fo terminal 3, ,
41) Recurrent sweep, —— > | — — —-— ,
,(2)
Triggered
sweep,
-¢-
™
\
Ww c J |
- a TIME BASE |
SN 1). C) a
Output from + TRIGGER 50 Q NORMAL! OPTIONAL
‘or DELAYED +GATE 509 or! oN «cH Output from external
4+RATE 50 2 connector ——— circuit directly to ert if
RATE GENERATOR | ' less delay is required.
Circuit to’ be.
triggered or,
synchronized,
L Output from external
circuit to oscilloscope
input.
nN
SS
Fig. 2-3. Using the + Trigger, the Delayed + Gate, or the +-Rate waveforms to drive an external
circuit, For (1) PULSE AMPLITUDE or SYNC control is set past the arrow to RECURRENT. For (2)
TRIGGER SOURCE switch is set to RATE GEN., and FUNCTION switch fo PULSE; the PULSE AMPLITUDE
or SYNC control is set for triggered sweep operation,
Page 18 T