Transcript
*10 Common tests for electronics, ranging from tablets to radios to blenders.
presents
Verify if electrical insulation in finished electronics is sufficient to protect the user from electrical shock. Relevant for appliances, transformers, printed circuit boards, etc.
Purpose:
The hi-pot test can also discover material and workmanship defects in the form of small gaps between current-carrying conductors and grounded material.
A typical hi-pot testing device
If a contaminant or vibration were to bridge gaps found during a hi-pot test, current could flow and pose a hazard to the user.
Procedure background: the voltage and measured current value are used to calculate the resistance of the insulation.
Purpose:
Provide a quantifiable resistance value for all of a product's insulation.
Procedure background: the test voltage is increased until the dielectric fails or breaks down, which will allow too much current to flow.
Purpose:
Estimate the breakdown voltage of a product's design.
Procedure background: a standard test voltage is applied (below the established breakdown voltage) and the resulting leakage current is monitored. This test fails if the leakage current reaches or exceeds the device’s preset limit.
Purpose:
Determine current leakage.
Useful for products subject to extreme environmental
Purpose:
Determine if a component or complete product can withstand a sudden and significant change in temperature.
A standard two chamber machine used in thermal shock testing
Procedure background: a product sample is subjected to a drastic rate of temperature change – typically around 86°F (30 °C)/min.
A test sample is subjected to extreme changes in temperature for X number of cycles. Determining how many cycles to run the test requires considering your product’s lifetime.
Relevant to products that might be near the ocean, such as: waterproof speakers, watches, navigation equipment, cellphones and headphones.
Purpose:
Analyze corrosion caused by salt water.
Equipment used to perform a salt spray test
This test evaluates the relative corrosion resistance of different materials and if your chosen materials meet your longevity expectations.
Test samples are placed in an enclosed salt spray testing unit and are subjected to a continuous indirect fog/spray of a salt water solution.
Determine if a product meets its claims for water resistance.
Purpose:
Products can generally be classified as water resistant, water proof or submersible.
Tests for each of these categories differ in the depth and length of time that an item is exposed to water.
For products only intended for light interaction with water.
APPLICATION
Procedure background: the item is subjected to a splash of water for about 10 minutes and then checked internally for traces of water.
Procedure background: submerge the item in water at a depth of 1m for 30 minutes.
APPLICATION
For products intended for temporary immersion.
Procedure background: depending on specifications, the item is submerged at X depth for at least 4 hours.
APPLICATION
For products intended for continuous immersion.
Products that frequently use this test: calculators, military equipment, cellphones, etc.
Purpose:
Determine how sensitive a product is to impact.
aka “product fragility analysis”
This test helps determine how well a product can survive trauma sustained during transit.
Impacts are very common during product transportation and distribution. With the ability to control several dimensions of impact shock, this machine easily determines just how fragile your product is.
This test is helpful for products that have warnings on them or that receive nearly continuous use, such as a computer keyboard.
Purpose:
Determine the ability of printed, painted, or polished surfaces to resist abrasion.
If a product is unable to withstand the scruff test, a consumer might not be able to read any product warnings and instructions.
Procedure background: a machine goes over a product with a relevant testing head thousands of times to simulate heavy use.
Helpful for phones, walkie talkies and other items that have a relatively long lifespan.
Purpose:
Evaluate and predict reliability of a product using accelerated stress conditions for each life-cycle phase.
Procedure background: subject an item to constant use (e.g. repetitively flip a switch, press a button, interact with a touch screen).
Life cycle testing helps determine overall durability and if any design weaknesses are present.
Useful for LED TVs and monitors, tablet PCs, MP3 players and laptops.
Purpose:
Verify there are no dead pixels on a screen.
Procedure background: look for dead pixels on a screen by verifying that it can display a spectrum of colors.
Helpful for goods that need to withstand shaking or dropping, such as: tablet PCs, phones, watches and MP3 players.
Purpose:
Simulate forces products are subjected to during transportation, shipping and in storage.
This vibration table isn’t as intense as an earthquake, but it’ll certainly shake things up a bit!
Procedure background: typically a vibration table is used to simulate vibration conditions that might cause rapid fatigue. This also includes testing product packaging.
Helpful for products being shipped internationally that will encounter a variety of environments, such as: tablet PCs, smartphones, binoculars, cameras and video recorders.
Purpose:
Determine if a product can withstand a sustained temperature and humidity level.
For example: environmental testing is effective for items with a screen that might collect condensation.
Procedure background: the difference between this test and the thermal shock test is sustained versus sudden exposure to temperature or humidity.
http://www.xmultiple.com/
http://www.labec.com.au/
http://sterlingperformance.org/
http://www.westpak.com/
http://www.elitetest.com/
http://www.electronics-project-design.com/
http://glamox.com/
https://i.ytimg.com
http://www.openelectrical.org/
http://shooteditlearn.com/
http://www.dudek.org/
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