Tektronix 549 Instruction Manual page 5

Introduction
The Type 549 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 (T5490) used in the Type 549 is a
direct view, bistable storage tube having a
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. Th is area functions as a locate zone in
single sweep store mode.
Th is instrument w ill perform to specifications in laboratory
environment with ambient temperature range between
C to 50° C except as indicated. Warm-up time for rated
accuracies at + 2 5 ° C ± 5 ° C is 20 minutes.
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
or Feature
VERTIC AL DEFLEC TIO N SYSTEM
Frequency Response DC to 30 MHz or more (at — 3
dB p oint).
Equivalent to a risetime of 12 ns or
less.
Input Deflection 1 0 0 mV/cm ± 3 %
Factor
H O R IZO N TA L DEFLECTIO N SYSTEM
Time Base A
Sweep Rate Accuracy w ithin ± 3 %
cated rate in a ll calibrated step
positions.
Variable Range Sweep rate continuously variable
uncalibrated.
Time Base B
Accuracy w ithin ± 3 %
Sweep Rate
cated rate in a ll calibrated step
positions.
Sweep Length Sweep length is adjustable from 4
cm or less to
X 5 Magnified Accuracy is w ithin ± 2 %
(Time Base A sweep rate accuracy.
and B)
STO RA G E PERFORMANCE
Equal to o r greater than 0 .5 cm/
W ritin g Speed
μ .
SECTION I
CHARACTERISTICS AND
OPERATING FEATURES
6 X 10 cm dis­
0
°
Adequate
Requirement
o f indi­
o f indi­
10 cm or more.
of the
Characteristic
or Feature
Enhanced W ritin g
Equal to or greater than 5 cm/
Speed
μ s .
Stored Resolution Stored vertical resolution, 20 lines/
cm.
Contrast Ratio Contrast ratio at operating level
is equal to or greater than 4:1.
VARIABLE TIM E DELAY
Delay Time Accuracy Accuracy is within ± 1 %
Base B sweep rate accuracy.
2.0 minor divisions of the DELAY
TIM E M ULIPLIER dial).
M ultiplier Incremental Incremental delay accuracy is ±
0 2
Linearity .
1 part in
Variable Time
delay interval.
Delay Jitter
CM setting).
N O TE
Stated accuracies apply o n ly when the V A R IA B LE
control is set to the CAL p osition.
A M PLITU D E CALIBRATOR
Voltage Output Peak to peak amplitude accu­
racy is w ithin ± 2 % o f indicated
amplitude when working into an
impedance o f 1 M Ω or higher.
When working into a 5 0 Ω load,
in the 0 .2 to 2 0 0 m V o lt posi­
tion, output amplitude is one-
h a lf
± 3 % .
Current Output 5 mA ± 2 % .
Current Signal Output Provides a square wave of current
or DC.
Frequency 1
square wave with zero volt base-
line.
Rise Time Equal to or less than 1 µs.
EX TERN A L H O R IZO N TA L AM PLIFIER
Frequency Response DC to 3 5 0 kHz at maximum gain
µ s
Requirement
of Time
% of total range.
20,000 of the available
(10 times B TIM E/
the indicated amplitude
kH z ± 2 5 % , positive going
(at — 3 dB p oint).
1-1
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