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proof mark
(redirected from Proof test)

   Also found in: Wikipedia 0.01 sec.
proof mark [′prüf ‚märk]
(ordnance)
Distinguishing mark on a weapon to indicate inspection and proof firing.


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As per IEC 61508 & IEC 61511 the documentation provides safety instrumentation engineers with the required failure data and with proof test recommendations.
But we are now faced with a lengthy delay before the scheme is fully commissioned while the Highways Agency engineers conduct extensive and time-consuming proof tests and experiments which appear to be over-cautious and unnecessary.
The first stage tank and interstage hardware were subjected to a proof test of 1.
 
 
 
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