measuring tests for a beamer/ prrojector by manish abraham
DESCRIPTION
Different Measuring tests for a beamer/ projector Different tests done are LCD Memory Effect. Button durability. Remote control (distance, obstacles). Lamp durability (3000-6000h; On/Off). Humidity and temperature differences. Defect of cooling fan. Light output (decreasing over lifespan).TRANSCRIPT
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MEASURING & TESTING BEAMER / PROJECTOR.
Manish Abraham & Reinhard Pollhamer
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Table of Contents
Product Description. Technical Aspects. LCD Memory Effect. Humidity and Temperature. Cooling Fan Defect. Lamp Durability.
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Product Description
Video projector Receives a video signal from TV-receiver,
PC, BluRay-Player, gaming console etc. Projects the pictures on a projection screen. Uses a lens system.
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Product Description
Lens system of a LCD-Projector.
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Technical Aspects
Light output measured in lumens. from 1500 lm for small rooms with low
ambient light up to over 4000 lm for big screens and/or no lighting control.
Resolution common resolutions are 800x600,
1024x768, 1280x720 and 1920x1080 pixels.
other formats have to be scaled.
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Technical Aspects
Picture deformation when projector has a horizontal or vertical
offset to the projection screen. digital or analog correction.
Temperature and noise heat is produced by the lamp. fans are needed to protect from
overheating.
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What could be tested?
LCD Memory Effect. Button durability. Remote control (distance, obstacles). Lamp durability (3000-6000h; On/Off). Humidity and temperature
differences. Defect of cooling fan. Light output (decreasing over lifespan).
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What is to be tested?
LCD Memory Effect: places on the lense can get darker if they are exposed to bright pictures.
Lamp durability: lamp is designed for 5000 operating hours.
Humidity and Temperature: the projector should be resistant to inside as well as outside conditions.
Defect of cooling fan: overheating of critical components should be prevented.
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LCD Memory Effect Test
To give an idea of different test parameters, I would like to show a presentation on different parameters and then show our test.
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LCD Memory Effect
2 test pictures
Testing durations: 15 / 30 / 45 / 60 / 70 / 80 / 90 / 100 / 120 / 150 / 180 minutes
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LCD Memory Effect
Results Check image quality of a pure black
respectively pure white image after each time period.
Protocol at which time and place/color the effect occured.
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LAMP DURABILITY
The Lamp inside a Projector.
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Lamp Durability
Lamp should endure 5000 hours of usage(>200 days).
Long time usage and many Power-On/Off procedures have a bad influence on durability.
To shorten the test time the projector is switched On/Off frequently. Randomized On/Off-signals or fixed values.
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Humidity and Temperature
Intended temperature range for use between -5° C and +40° C
Intended humidity range for use between 20 and 90 %
Protocol sheet with intervals shorter intervals at critical temp. or humidity
levels
Test environment climate chamber
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Humidity and Temperature
Humidity [%] Temperature [°C] Status
20 20 OK
40 20 OK
60 20 OK
70 20 OK
75 20 …
80 20 …
85 20 …
90 20 …
92 20 …
94 20 …
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Cooling Fan Defect
System must shut down before overheating
Temperature sensors in the projector case
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Cooling Fan Defect
1st task: find the critical temperature.
2nd task: configure the built-in temperature sensor.
3rd task: test if the system shuts down when the critical temperature is reached.
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Questions ?????