Atec Tektronix-VM700T Manuel d'utilisateur

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Copyright © 1996, T
ektr
onix, Inc. All rights reserved.
Many capabilities in one instrument
Digital waveform monitor
Digital vectorscope
Picture Display
Group delay and frequency
response
Noise measurement set
Automatic measurement set
Auto mode
Unattended monitoring of NTSC
video signals from studios, STLs,
Earth Stations, and transmitters
User-specified limits
Measure mode provides graphic
display of measurements
ICPM
K factor
Differential gain and phase
Chrominance to luminance delay
Noise spectrum
Group delay with sin x/x
Color bars
Relative to reference on most
measurements
Configurable for all standard
test signals
Award winning user interface
State-of-the-art architecture
Extremely fast update rate
Parallel and serial printer ports
Three input channels
Channel difference modes
Exter
nal VGA display port
Fully documented r
emote contr
ol
operation
Har
dcopy for analysis and
documentation
VM700T (turbo)
Video Measurement Set
Option 01
NTSC Video Measurements
Recognized with eight technical
Emmy awards and one Oscar for
outstanding contributions to the
television industry, Tektronix
world class core competencies
have enabled it to design and
deliver the most comprehensive
solutions in the industry.
The VM700T is a product of this
core competency. Recognized as
the defacto industry standard
that keeps pace with evolving
customer needs, the VM700T is a
total solution for your baseband
video and audio
1
monitoring and
measurement needs. Features
such as an extremely fast and
fully automatic measurement
mode as well as full manual oper-
ation
pr
ovides the first time user
as well as the seasoned professional
an unequaled value for their test
and measur
ement investment.
Automatic video measur
ement set
The VM700T Auto mode makes
standard video transmitter mea-
sur
ements quickly and automati
-
cally, including those specified
in RS-250C/EIA-250C, NTC-7
and RS170A. Both vertical interval
and full field measur
ements can
be made and compar
ed with
user-defined limits. A dual limit
verification system is employed
to generate a caution or alarm
message when either limit is vio-
lated. Reports can be generated
and printed automatically at
operator scheduled times or
triggered from a conditional event.
Graphic displays of measurements
Measur
e mode pr
ovides virtual
real time graphic displays of
measurement results automati-
cally. Vertical interval or full
field measurements including
noise spectrum, group delay,
K-factor, differential gain and
differential phase are presented
as clever
, easy to understand
interactive digital displays. Such
displays ar
e indispensable when
extremely fast measurement
update rates (up to 30 times a
second) ar
e required to provide
instant feedback of critical
adjustments and analysis of sig-
nal variations. User definable
limits ar
e visually integrated
into each graphic display and
can be used to trigger
a measur
e
-
ment report or a user definable
macro function. Such a function
can, for example, dial out through
1
Option 40 audio measurement package.
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Résumé du contenu

Page 1 - NTSC Video Measurements

Copyright © 1996, Tektronix, Inc. All rights reserved.Many capabilities in one instrument– Digital waveform monitor– Digital vectorscope– Picture Disp

Page 2

AUTO MODE (continued)OUT-OF-SERVICE MEASUREMENTSMeasurement Range Accuracy Test SignalField Time Distortion 0 to 40% ±0.5% Field Square WaveWAVEFORM D

Page 3

Measurement results are displayed in an easy-to-read format indicating the time, signal source, measurement, and whether the measured value exceeded c

Page 4 - MEASURE MODE

12Measurement Methods —Auto-ModeThe following paragraphsdescribe the measurement methods for each measurement.Each timing measurementmethod is written

Page 5 - MEASURE MODE (continued)

Color Bar MeasurementsColor Bar Amplitude Error:Measured as deviation of the peak-to-peak amplitude of each color bar from the nominal value for that

Page 6

Blanking Variation: Measuredas the peak-to-peak variationof the blanking level withinevery third line of a field.Frequency Response Measurements(FCC M

Page 7

OrderingInformationVM700T Option 01NTSC Video Measurement SetWhen ordering, please use the nomenclature given here. The standard instrument is shipped

Page 8

Contact Tektronix:ASEAN / Australasia / Pakistan (65) 6356 3900Austria +41 52 675 3777Balkan, Israel, South Africa and other ISE Countries+41 52 675 3

Page 9 - AUTO MODE

a modem to report measurementresults or control a signal router. A relative to reference modeallows normalizing to a signalsource or eliminate signal

Page 10 - UTO MODE (continued)

Vertical interval test signals can be seen very clearly for additional analysis of the signal.These can be printed as support documentation for automa

Page 11 - Lower Upper

MEASURE MODE1,2BAR LINE TIMEAbsolute RelativeMeasurement Range Mode ModeAccuracy AccuracyBar Level 50 to 200 IRE ±0.5% ±0.2%Sync Level 20 to 80 IRE ±0

Page 12

MEASURE MODE (continued)CHROMINANCE NON-LINEARITY4Absolute RelativeMeasurement Range Mode ModeAccuracy AccuracyChrominance Amplitude 0 to 100% ±0.4% ±

Page 13

INCIDENTAL CARRIER PHASE MODULATIONMeasurement Range AccuracyICPM (requires zero Carrier Pulse 0 to 90 deg ±1.0 degand the quadrature output of the d

Page 14

LINE FREQUENCYMeasurement Range AccuracyLine Frequency ±3% ±0.1%Field Frequency ±3% ±0.1%LUMINANCE NON-LINEARITYAbsolute RelativeMeasurement Range Mod

Page 15 - Information

MEASURE MODE (continued)NOISE SPECTRUMMeasurement Range Absolute Mode AccuracyUnweighted Signal-to-Noise Ratio –20 to –80 dB ±0.4 dB(5 MHz Low Pass) (

Page 16 - Last Updated June 15 2005

AUTO MODERS-170A HORIZONTAL BLANKING INTERVAL TIMING MEASUREMENTSMeasurement Range Accuracy Test SignalColor Burst Width 6 to 13 cycles ±0.1 cycles Ho

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