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4-48 Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
/8 /7 /6 /5 /4 /3 /2 1X 2X 3X 4X 5X 6X 7X 8X
533101
Test Phosphor persistence
Purpose The phosphors on the face of most CRTs continue
to glow for a short period of time after the electron
beam has stopped energizing them. This
phenomenon is called persistence. A certain amount
of persistence is desirable in most applications. It
prevents a flickering of a displayed image that
most users would find objectionable. On the other
hand, a CRT with an overly long persistence time
causes moving objects to leave a blurred trail.
Method A flickering in the slower moving boxes indicates
that the combination of refresh rate and phosphor
persistence is not suitable for long-term viewing.
A fading tail left behind by the faster moving boxes
indicates that the display may not be suitable for
viewing animated images.