Atec Tektronix-VM5000 - Manual (Page 4)

Automated Video Measurement Set
VM5000
signals (Option VGA). These parameters
vary by application because of differences
in hardware technology, signal attributes,
applicable standards and historical test
methodology. TV test measurements are
based on the de-facto industry standard
VM700T and have been adapted to assess
distortions unique to digital devices and
HDTV signals. The PC graphics measure-
ment set delivers fully automated VESA
compliance testing and video measure-
ments, as well as reporting other parameters
commonly utilized to characterize PC
graphics device performance.
Fast, Accurate and Reliable
Automated Video Measurements
The VM5000 is differentiated from
conventional oscilloscopes, waveform
monitors or modular instruments by its
automated video measurements.
Automated measurements deliver benefits
in terms of speed, accuracy and ease
of use that almost obsolete manual
approaches, and even user-developed
programs. Automating signal configuration,
signal acquisition and data analysis enables
robust and reliable operation impervious
to signal variations. The VM5000 applies
optimized video measurement algorithms
and extended data processing to deliver
accuracy and reliability that outperforms
even the most skilled expert user.
Auto Configuration – By selecting the
applicable format and desired measure-
ments from the configuration menu, the
VM5000 automatically configures gain,
offset and time scale based on the nominal
signal values expected. Variations from
nominal values are accommodated with
auto range capabilities.
Auto Range – The auto range feature
enhances accuracy and enables automated
measurement of signals that vary from
nominal levels. This feature automatically
optimizes gain and offset based on the
signal conditions, enabling the instrument to
consistently present the best results possible.
Automatic Special Position – The
VM5000’s automatic special position
function ensures that automated meas-
urements are robust to temporal signal
distortions, alternate test signals and
alternate output display modes. Always
active, this feature identifies appropriate
test signal events and sets measurement
cursor locations optimally to ensure
consistent and meaningful test results.
Measurement location selections made
by the VM5000 can be analyzed or
documented with the selectable feature
included in the report generator.
Auto Mode – Enables users to instruct
the instrument to make one, selected or
all automated video measurements with a
single run command. While functioning in
Auto Mode, the instrument automatically
selects the appropriate test signal line,
utilizes pre-set measurement configura-
tions and averaging selected by the user
and completes each measurement.
Option VGA includes multi-line measure-
ments capability, enabling users to measure
selected parameters on many or all lines
in a frame with a single run command.
Measurement Cursors (Special Position) –
Options SD and HD address requirements
for custom signal analysis by enabling
users to input customized measurement
locations for the Frequency Response
and Noise measurement parameters.
For frequency response measurements,
users can select either timing location
input or frequency input to make response
measurements anywhere within the
supported video bandwidth utilizing a
standard sweep signal. Input locations
can be further toggled within YPbPr
signals to accommodate either 4:2:2 or
4:4:4 video. This enables detailed analysis
of roll-off, frequency distortion, identification
of spurs and aliasing anywhere across the
useful frequency spectrum.
Flexible Noise Measurement – Options
SD and HD offer the capability to make
both weighted and un-weighted noise
measurements. Default selections for
bandwidth cut-off filtering are automati-
cally via the format configuration; however,
users can enter other bandwidth cut-off
filter selections if desired to clarify noise
characteristics. Measurement locations
may also be input by users for the noise
measurement. This is most useful when
used in conjunction with the Noise
Spectrum display, simplifying identification
of the frequency and relative magnitude
of noise peaks in the video signal.
Automated VESA Compliance
Testing for Analog RGBHV Signal
Formats (Option VGA)
The emergence of IP broadcast video and
convergence of traditional “TV” and “PC”
video entertainment devices have resulted
in PCs evolving into media gateways to
Video Measurement • www.tektronix.com/video 4
H Sync Measurement Results (Option VGA). Multiburst Measurement Results Display
(Option SD and HD). Frequency Response Measurement Input
Selections (Option SD and HD).