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This article describes a technique for measuring jitter magnitude and jitter frequency of a raster scanned CRT monitor.
English (United States)
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A Jitter Measurement Method for CRT Monitors
This article describes a technique for measuring jitter magnitude and jitter
frequency of a raster scanned CRT monitor.
Because of the scanned raster of the CRT based monitor, techniques for
measuring jitter magnitude and frequency have been lacking. No single method
would yield both the jitter amplitude and frequency.
A new technique uses a stand mounted 25X microscope containing a
liquid crystal shutter. This LCD shutter will act as a transmission stroboscope to
allow viewing the scanned CRT spot for very brief periods at specific times.
The LCD shutter is turned on and off by using a pulse/delay generator that is
synchronized with the monitor vertical scan waveform, the monitor horizontal
scan waveform, or the AC line waveform as required. The modulation of the
LCD shutter within the microscope allows the CRT spot to be frozen in time,
thereby stopping the jitter of the spot.
By controlling the frequency of the pulse generator, the CRT spot can be
seen to move slowly or stop in space as one would view a fan blade using a
stroboscope. When the jitter is stopped, the physical displacement of the CRT
spot can then be easily determined using the microscope graticule. The
frequency of the jitter would be the pulse generator frequency.
The technique is most effective when used to measure the jitter of the first or
last pixel of a displayed horizontal scan line.