What to verify on Test Setup for Environmental Testing

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danielleecm

#1
hi any kind soul can advise is there any kind of checklist to verify that the test setup for environmental testing is appropriate? Thanks
 
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Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#2
There are different kinds of environmental tests/testing. We will be better able to help if we know more specifically what environmental test(s) you are referring to.
 

harry

Super Moderator
#3
Environmental testing in the context of the requirements of an environmental management system or in the context of an equipment's ability to withstand the harsh environment it is supposed to be in.

There are many types of test for each of these 2 categories.
 
D

danielleecm

#4
Hi Marc and Harry,
Appreciate your effort in replying my question. The environmental testing are mainly on temperature (high/low), pressure, vibration, shock and moisture. Is there any checkist you guys can show? Thanks
 

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#5
I am not aware of a specific checklist for any of the tests other than the test procedures themselves. I managed an environmental test lab back in the 1980's, so it has been a long time, but essentially it was a knowledge thing and was different for different testing. For example, in temperature cycling you had to understand what was happening so there were aspects such as placement of the DUT (device under test) in the chamber. In vibration and shock there was the aspect of the appropriate fixture and the material the fixture was made out of, as well as placement of accelerometer(s) on the DUT.

We never had any check lists per se other than the test procedure its self. I'm not sure what you're looking for. Are you wanting a general check list applicable to each different test? E.g.: Ensure BNC connectors are all properly attached to test monitoring equipment.

Most of what we relied upon was training test technicians in "good test laboratory techniques", such as setup (the test spec calls for 75 degrees C for 4 hours - Is the controller set for degrees C or degrees F?)
 
D

danielleecm

#6
hi marc, can we say that refering to test plan is good enough? I am actually trying to see which area to focus on when reviewing the test plan? or what to look out for?
 

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#7
I don't know how they do it these days, but I think it's probably about the same. This is in the context of military manufacturing in the US in the 1980's when I was involved in areas such as military communications equipment and other military electronics.

In the "old" days a device or product had to have an "Environmental Design Criteria Test Plan" written specifically for it. These were typically a sub-part of a larger document called a "Quality Assurance Project Plan" (QAPP). I used to write them. An EDCTP contained all the tests the "product" had to go through. What tests and things like vibration profiles, temperature ramp rates, duration of each test, and all the other tests and applicable criteria were all in the EDCTP. The tests themselves were usually from "Mil Specs" such as Mil-Std-810 which contained a number of specific types of tests, or a derivation of a standard Mil Spec test, but other specific tests were often defined within the specification for the DUT. Note that the DUT could be a component of a finished product or the finished product its self. I really can't remember any of the specs off hand. I worked with a lot of them. Many of them are no longer in existence.

The EDCTP was what was followed along with referenced specifications & tests, as well as anything applicable in the QAPP. There were no "check lists of any kind other than some general ones used for "standard" test reports for some tests. Many times test reports were specific to the DUT, though.

So in short, the EDCTP was the "Bible" along with referenced tests.

In reviewing a test plan the only thing I did was cross reference the QAPP, the EDCTP and any other referenced standards and specifications to ensure the test plan was in conformance with all the requirements. I can't really tell you anything specific with respect to what to look for other than that.

As I mentioned, part of the process was having experience/training to "know" what to look for. Sometimes part of that was to understand what the purpose of the test was to be able to assess whether the test parameters "make sense". The purpose of the test was usually defined to some degree in the EDCTP.

The biggest problem for me back then was having qualified technicians performing the tests as written. I remember one test technician who screwed up and programmed the controller in a temperature chamber in degrees C when the test called out a temperature in degrees F. Needless to say when the DUT started smoking we knew something was very, very wrong.

I have attached an old "demo" (unfinished/in-process) EDCTP I wrote years ago. It may help you in thinking about this type of environmental testing.
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danielleecm

#8
thanks Marc, your reply is sufficient and appreciate your effort on replying me. Hope everything goes well for you and be blessed.

Daniel
 
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