Guardbanding With Confidence - Fluke

Guardbanding with ConfidenceDavid DeaverFluke CorporationEverett, WashingtonABSTRACT:Setting test limits different than specification limits influences the risk of acceptingdefective units (consumer risk) and rejecting conforming units (producer risk). Much hasbeen written about setting limits to accomplish various strategies such as maintaining lowconsumer risk, equalizing consumer risk and producer risk, or minimizing the cost offaulty test :Ideally, one would encounter only perfect products which all perform to theirspecifications and no adjustments or rejection of defective units would be to the ideal condition would be the situation where some defective units exist butall can be easily determined by comparing to an ideal standard; or a nearly ideal standard;or a fairly good standard; or .. an available standard. There is considerable debate as tohow much better a standard must be than the items being tested, the test uncertainty metrology, a number of years ago, required that standards be at least ten timesbetter than the products being compared to them; a test uncertainty ratio (TUR) of 10 performance in the products being tested, coupled with an emphasis oncontaining costs, has resulted in a reduction of acceptable TURs to 4:1 with some arguingthat 3:1 is sufficient.

Guardbanding With Confidence David Deaver Fluke Corporation Everett, Washington ABSTRACT: Setting test limits different than specification limits influences the risk of accepting

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