Tektronix 549 User manual

I N S T R U C T I O N
M A N U A L
TYPE 549
STORAGE
OSCILLOSCOPE
Tektronix, Inc
S.W . M illikan Way • P. O. Box 500 • Beaverton, Oregon 97005 • Phone 6 -0161 • Cables:
070-0508-00
Tektrohix
266

WARRANTY
All Tektronix instruments are warranted
against defective materials and workman-
ship for one year. Tektronix transformers,
manufactured in our own plant, are war
ranted for the life of the instrument.
Any uestions with respect to the war
ranty mentioned above should be taken
up with your Tektronix Field Engineer.
Tektronix repair and replacement-part
service is geared directly to the field,
therefore all re uests for repairs and re-
placement parts should be directed to the
Tektronix Field Office or representative in
your area. This procedure will assure you
the fastest possible service. Please include
the instrument Type and Serial or Model
Number with all re uests for parts or
service.
Specifications and price change privi-
leges reserved.
Copyright © 1966 by Tektronix, Inc.,
Beaverton, Oregon. Printed in the United
States of America. All rights reserved.
Contents of this publication may not be
reproduced in any form without permission
of the copyright owner.

CONTENTS
Section 1Characteristics and Operating Features
Section 2 Operating Instructions
Section 3 Circuit Description
Section 4 Maintenance
Section 5 Performance Check
Section 6 Calibration
Parts Ordering Information
' ’ iAbbreviations and Symbols
Section 7 Electrical Paris List
Mechanical Parts List Information
Section 8Mechanical Parts List
Section 9Diagrams
Mechanical Parts List Illustrations
Accessories
Abbreviations and symbols used in this manual
are based on, or taken directly from, IEEE Stand
ard 260 "Standard Symbols for Units", MIL-STD-
12B and other standards of the electronics
industry. Change information, if any, is located
at the rear of this manual.
Type 5 9

TYPE 549 STORAGE OSCILLOSCOPE fast ¥v«it*m;
inn it. A*riG HCALt MftO»
OUAl ttACt WjO W Wl>
(UllM'd
n»r*l»
CHANNEL 2
CHANNEL 1
iNttir h o c io i infv< micra*
tt^rumn
Fig. 1-1. The T po 549 Storage Oscilloscope.
Type 549 ®

SECTION I
CHARACTERISTICS AND
OPERATING FEATURES
Introduction
The Type 5 9 Storage Oscilloscope is a laboratory instru
ment designed to operate with all Tektronix letter-series or
one-series plug-in units.
The cathode ray tube (T5 90) used in the Type 5 9 is a
direct view, bistable storage tube having a 6 X 10 cm dis
play area, divided into two 3 X 10 cm targets. The targets
are independently controlled for split screen applications.
An additional area which does not store is provided to the
left of the targets. This area functions as a locate zone in
single sweep store mode.
This instrument will perform to specifications in laboratory
environment with ambient temperature range between 0°
C to 50° C except as indicated. Warm-up time for rated
accuracies at +25° C ± 5 ° C is 20 minutes. Adequate
ventilation must be maintained, and a minimum two inch
clearance around the instrument is recommended.
Statements related to measurement capabilities of the
instrument with respect to voltage, time or frequency are
characteristics and are printed in bold type. Other features
are listed in regular type.
Characteristic Re uirement
or Feature
VERTICAL DEFLECTION SYSTEM
Fre uency Response DC to 30 MHz or more (at — 3
dB point).
Equivalent to a risetime of 12 ns or
less.
Input Deflection 100mV/cm ± 3 %
Factor
HORIZONTAL DEFLECTION SYSTEM
Time Base A
Sweep Rate Accuracy within ± 3 % of indi
cated rate in all calibrated step
positions.
Variable Range Sweep rate continuously variable
uncalibrated.
Time Base B
Sweep Rate
Sweep Length
X 5 Magnified
(Time Base A
and B)
Accuracy within ± 3 % of indi
cated rate in all calibrated step
positions.
Sweep length is adjustable from
cm or less to 10 cm or more.
Accuracy is within ± 2 % of the
sweep rate accuracy.
Characteristic Re uirement
or Feature
Enhanced Writing
Speed
Stored Resolution
Contrast Ratio
E ual to or greater than 5 cm/
μs.
Stored vertical resolution, 20 lines/
cm.
Contrast ratio at operating level
is equal to or greater than :1.
VARIABLE TIME DELAY
Delay Time Accuracy Accuracy is within ± 1 % of Time
Base B sweep rate accuracy. |±
2.0 minor divisions of the DELAY
TIM E MULIPLIER dial).
Multiplier Incremental
Linearity Incremental delay accuracy is ±
0.2% of total range.
Variable Time
Delay Jitter 1 part in 20,000 of the available
delay interval. (10 times B TIME/
CM setting).
NOTE
Stated accuracies apply only when the VARIABLE
control is set to the CAL position.
AMPLITUDE CALIBRATOR
Voltage Output Peak to peak amplitude accu
racy is within ± 2 % of indicated
amplitude when working into an
impedance of 1 MΩ or higher.
When working into a 50 Ω load,
in the 0.2 to 200 m Volt posi
tion, output amplitude is one-
half the indicated amplitude
±3%.
Current Output 5 mA ± 2 % .
Current Signal Output Provides a square wave of current
or DC.
Frequency 1 kHz ± 2 5 % , positive going
square wave with zero volt base-
line.
Rise Time Equal to or less than 1 µs.
STORAGE PERFORMANCE EXTERNAL HORIZONTAL AMPLIFIER
Writing Speed E ual to or greater than 0.5 cm/ Fre uency Response DC to 350 kHz at maximum gain
μµ s. (at — 3 dB point).
1-1

Characteristics— Type 549
Characteristic Re uirement
or Feature
Deflection Factor
1 x 0.2 V/cm maximum. (VARIABLE 1
10 control fully clockwise)
1 0 x 2V/cm maximum.
VARIABLE 1-10 control provides
variable attenuation of the input
signal of at least 10:1.
FRONT PANEL OUTPUT SIGNALS
VERT SIG OUT
SWEEP A
+ GATE A
+ GATE B
DLY’D TRIG
Output is 1.5 volts per centimeter
±20% of displayed deflection on
the CRT. Frequency response is DC
to 700 kHz (at the —3 dB point).
This is equivalent to a risetime of
1 µs or faster.
150 volts ± 1 0 volts increasing to
approximately 180 V ± 1 0 volts at
the faster sweep speeds and having
the same time duration as the A
sweep. Recommended load resist
ance equal to or greater than 100
ktl.
Within the range of 20 to 0 volts.
Positive going pulse with the base
line at zero volts. Time coincident
with the A sweep. Recommended
load resistance equal to or greater
than 5 kO.
Within the range of 20 to 0 volts.
Positive going pulse, baseline at
zero volts, time coincident with the
B sweep.
A positive going pulse 7 V ± 2 V
into a load equal to or greater
than 10 kΩ.. Pulse occurs at the
end of the delay period.
EXTERNAL SIGNAL CONNECTORS
Z Axis Modulation
CRT GRID An applied 20 volt peak-to-peak
signal from DC to 1 MHz will blank
or unblank the CRT. A 5 volt peak-
to-peak signal will produce notice
able modulation. Negative portion
of signal blanks CRT beam.
CRT CATHODE An applied 20 volt peak-to-peak
signal from 20 kHz to 1 MHz will
blank or unblank the CRT. A 5
volt peak-to-peak signal will pro
duce noticeable modulation. Posi
tive portion of the signal blanks
CRT beam.
Remote Control Connector
Remote Erase -
Upper Screen
Lower Screen
Remote Erase and
Reset
Ground pin A.
Ground pin B.
Ground pin E.
Remote Single Sweep
Reset Ground pin F.
Remote Save Ground pin C.
Remote Store -
Upper Screen Ground pin H.
Lower Screen Ground pin J.
Aand B SWEEP GENERATOR
TRIGGERING FEATURES
Source Internal (from trigger pickoff cir
cuit in the vertical amplifier or from
the plug-in unit), external and line.
Coupling Direct (DC), capacitive (AC) or low-
frequency rejection (AC LF REJ).
Slope Trigger on positive going or nega
tive going portion of trigger signal.
Mode Automatic or Trig, adjustable stabil
ity at an adjustable level and free
running sweep.
Triggering Performance1
A Time Base
Source Coupling Condition
NORM
(internal) DC Minimum 0.2 cm of deflection, DC
to 10 MHz, increasing to 2.0 cm at
30 MHz.
AC Same amplitude as DC. 300 Hz to
30 MHz,
AC LF REJ Same amplitude as DC. 200 kHz to
30 MHz.
PLUG-IN
(internal) Triggering dependent on plug-in
unit performance.
EXT DC Minimum 0.3 volt signal, DC to 10
MHz increasing to 3 volts at 30
MHz.
AC Same amplitude as DC, 300 Hz to
30 MHz.
AC LF REJ Same amplitude as DC, 200 kHz to
30 MHz.
1 Upper and lower frequenc triggering requirements for Time Base
A are shown in Fig. 1-2.
1-2

Characteristics— Type 549
B Time Base2
Source Coupling Condition
NORM
(internal) DC Minimum 0.2 cm of deflection, DC
to 1 MHz, increasing to 1 cm at 10
MHz.
AC Same amplitude as DC, 300 Hz to
10 MHz.
AC LF REJ Same amplitude as DC, 200 kHz to
10 MHz.
PLUG-IN
(internal) Triggering dependent on plug-in
unit performance.
EXT DC Minimum 0.3 volt signal, DC to 1
MHz, increasing to 1.5 V at 10 MHz.
AC Same amplitude as DC, 300 Hz to
10 MHz.
AC LF REJ Same as DC, 200 kHz to 10 MHz.
Automatic Mode: Time Base A and Time Base B3
Source Condition
NORM (internal) Minimum 0.2 cm of deflection, 50
Hz to 10 kHz, increasing to 2 cm at
1 MHz. '
EXT Minimum 0.3 volt signal, 50 Hz to
10 kHz, increasing to 3 V at 1 MHz.
External Trigger Input characteristics:
Time Base A 1 megohm paralleled with 25 pF
except the AC LF REJ coupling
which is approximately 91 kilohms.
3 Upper and lower frequenc triggering requirements are shown in
Fig. 1 -3.
3 The Automatic Mode triggering features shown in Fig. 1 -2 and
1-3 are applicable onl when using AC coupling.
Time Base B 1 megohm paralleled with 0 pF,
except the AC LF REJ coupling
which is approximately 91 kilohms.
Maximum Exter- 50 volts, combined DC and AC
nal Input Voltage peak.
POWER SUPPLY REQUIREMENTS
AND FEATURES
Trans Pri Sel A switch selects the center voltage
of two operating ranges: 9 to 138
VAC or 187 to 279 VAC.
LINE RANGE Selector LOW: 10 VAC ± 1 0 % or 208
VAC ± 1 0% .
MED: 115 VAC ± 1 0 % or 230
VAC ± 10 % .
HIGH: 127 VAC ± 1 0 % or 25
VAC ± 1 0% .
Line Voltage Frequency 50 to 60 Hz.
Input Power (Maximum) 750 volt amperes, 650 watts.
Thermal Protection Automatic resetting thermal cutout
which interrupts instrument power
if internal temperature exceeds a
safe operating level.
MECHANICAL FEATURES
Construction Aluminum alloy chassis. Anodized
front panel. Blue vinyl coated cabi
net.
Overall Dimensions 13 inches wide, 2 inches long and
17 inches high.
Standard accessories supplied with the instrument will be
found on the last pull-out page at the back of the manual.
For optional accessories see Tektronix, Inc. catalog.
®I 1-3

Fig. 1-2.
TYPE 549 TIM E-BASE A
TRIG GERIN G SIG N AL REQUIREMENTS
I
2*
Frequenc
j§
Characteristics— Type 549

CM, Peak-to-Peak NORM (Internal)
TYPE 5 49 TIM E-BASE B
TRIG GERIN G SIG NA L REQUIREM ENTS
1 10 100 l k 10 k 100 k 1 M 10 M
Frequenc
■a
n
Ur
VOLTS, Peak-to-Peak EXT

SECTION 2
OPERATING INSTRUCTIONS
Introduction
The Type 5 9 combines high speed storage with a general
purpose laboratory oscilloscope. This section of the manual
describes operation and applications of the instrument.
The description begins with the storage tube and its oper
ational characteristics, then covers each front and rear panel
control, switch and connector.
Circuit functions and modes of operation for the Type 5 9
are described next, with emphasis on storage and storage
technique. -
The section concludes with general oscilloscope measure
ment applications.
Storage Tu es
Terms and storage nomenclature used in this manual are
defined at the start of the circuit description section. A
brief discussion on storage tube principles is also presented.
The storage tube in the Type 5 9 is a relatively new tube,
and can be more easily damaged than conventional CRT's.
However with reasonable care they will provide very satis
factory servise. The following precautions will prevent dam
age, increase tube life and maintain optimum performance.
Protective circuitry is incorporated to limit beam inten
sity. However, a repetitive sweep over the same area for
extended periods may damage the storage target. Use only
the intensity level required to write a well-defined display.
Turn the INTEN SITY control to its minimum setting during
warm-up time and before changing to slower sweep speeds
or switching the HORIZONTAL DISPLAY selector.
Turn the IN TEN SITY control counterclockwise and the
POWER switch to OFF when changing plug-in units.
Avoid continued use of one target area. This causes dif
ferential aging of the storage target and may result in dif
ferential light emitting qualities over the target area.
Avoid leaving stored display on the screen longer than
required. Operation in the ready-to-write (fully erased)
state will give longer target life.
When store operation is no longer required, shift to con
ventional mode operation. Conventional operation does not
deteriorate the storage screens; however, avoid prolonged
display periods of a repetitive waveform or a free running
sweep. These may cause a residual image of the display to
appear in the store mode.
Readjustment of the focus and astigmatism is usually
required after the beam intensity level is changed to main
tain optimum writing speed.
Storage tube characteristics change with use more notice
ably than characteristics of conventional tubes. Circuit cali
bration should, therefore, be checked frequently to ensure
optimum operation. Operating levels for a new tube should
be checked after the first 100 hours of operation. Progres
sively longer periods between checks may then be set.
Storage Target Phenomena
The storage screen may display unusual dark or bright
areas which resemble previously written information. Three
different types of residual images may be noted.
1. Negative residual image.
This appears in the ready-to-write state as a negative
image of some previously stored display. It is caused by
leaving a stored display on the target over an extended
period. This type of image usually disappears within a few
hours of operation.
2. Bright residual image.
This appears only in the enhanced mode as a bright image
of some previously written display. The secondary emission
characteristics of the affected target area have changed so
that they fade positive when pulsed by the enhanced pulse
while the reminder of the target area reacts normally.
These bright residual images are caused by stored dis
plays for extended periods. They are not a problem if the
enhance level is kept below the point the images appear and
with time will fade away.
3. Dark Burn.
This is a spot or line across the screen which has a lower
light level than the rest of the target when the target is
fully written. If extreme, the dark burn area will not store.
Dark burn is caused by the destruction of the storage
screen from a high intensity writing beam and is similar to
phosphor burn in a conventional CRT.
This type of damage may remain indefinitely if the burn
is extensive.
Generally, non-destructive type images will fade in about
the same period of time it took to produce them. It is import
ant to age the target area as uniformly as possible to main
tain uniformity in writing speed and light level.
General Information
The Type 5 9 will operate in ambient temperatures up to
122° F (50° C). A minimum of two inches unobstructed clear
ance around the instrument is recommended for adequate
ventilation. If the internal temperature becomes too high,
a thermal cutout will open and disconnect power until the
internal temperature has returned to approximately 115° F.
If this occurs, check to see that air circulation and ventila
tion are adequate. Constant temperature is important for
accurate operation of the instrument.
The instument requires a minimum 20 minute warm-up
period at ambient room temperature of +25° C ± 5 ° C for
rated accuracies.
@2 2-1