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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.

4-48

Chapter 4: Built-In Images

Model 801GC, 801GF & 801GX¥Rev. X1

Page 86
Image 86
Quantum Data 801GC, 801GF, 801GX manual 533101 1X 2X 3X 4X 5X 6X 7X