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
MEASURING & TESTING BEAMER / PROJECTOR.
Manish Abraham & Reinhard Pollhamer
Table of Contents
Product Description. Technical Aspects. LCD Memory Effect. Humidity and Temperature. Cooling Fan Defect. Lamp Durability.
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.
Product Description
Lens system of a LCD-Projector.
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.
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.
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).
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.
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.
LCD Memory Effect
2 test pictures
Testing durations: 15 / 30 / 45 / 60 / 70 / 80 / 90 / 100 / 120 / 150 / 180 minutes
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.
LAMP DURABILITY
The Lamp inside a Projector.
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.
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
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 …
Cooling Fan Defect
System must shut down before overheating
Temperature sensors in the projector case
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.
Questions ?????