What is meant by “fixturing” in regards to vibration testing?
As stated in ISTA testing protocols, "Restraining devices shall be used to... (1) Prevent the test specimen from moving off the platform and (2) maintain test orientation of the packaged-product, but (3) not restrict the vertical motion of the test specimen."
This means that the test package should not be affixed directly to the vibration table. For safety, the test package should be prevented from falling off by some "fixture", "fence", "restraining device" around the sides, but not attached to table in such a way that the vertical motion is restricted. This allows the package to respond to the vibration of the table in a natural way.
What are the benefits of random vibration testing vs. fixed-displacement testing?
The answer, in a nutshell, is "better simulation of the actual transport environment". Fixed displacement vibration has been around for over 60 years, and was the first type of vibration ever used for packaged-product testing. In reality, it was ...
Is there a formula to calculate the g level at a certain frequency and displacement during vibration testing?
The formula that relates g, frequency, and displacement for sinusoidal vibration is: g = 0.0511 x f2 x D Where g is zero-to-peak acceleration f is the frequency and D is the double amplitude displacement in inches. For example, 0.5g at 2Hz requires a ...
Where can I buy testing equipment?
Due to Anti-Trust Laws we are unable to recommend specific equipment suppliers for you to contact. You can search for various suppliers of testing equipment (drop testing equipment, vibration testing equipment, etc.) that are ISTA members at the ...
Who determines pass or fail of testing results?
These determinations are dependent upon the particular product, package, distribution system, market, customers, and other factors and can vary widely. Therefore product damage and allowable package degradation must be defined by the shipper, ...
How many samples are required for ISTA testing?
Most ISTA® Procedures and Projects require a minimum of one packaged-product to be tested. A single "pass", however, does not provide high confidence that other seemingly identical packaged-products will also pass the same test. This is due to ...