Error calculation of electronic universal test machine, determination of 0.5 accuracy level

Representation of precision levelElectronic universal testing machineThrough the accuracy level, you can accurately and quickly understand the overall performance of the electronic universal testing machine. The universal testing machine, tensile testing machine, universal material testing machine, and universal testing machine produced by Jinan Hengsi Shanda Testing Equipment Co., Ltd. According to the verification regulations of JJG476-2001 "Fracture Test Machine" and the verification regulations of JJG1025-2007 "Constant Acceleration Speed ​​Building Materials Test Machine" use two sets of formulas. Inspired by this, the author tried to use character D to represent the meter reading, character F to represent the test machine reading, and pin i is used to express the 3-sequence reading sequence, and then avoid the correction of complex locks, thus obtaining the following results that are conducive to the unified formula, concise expression, consistent execution, close to traceability and clear at a glance:
1. Test machine reading
The relative error of the display value q=[(Fi-D)/D]x100%
Relative error of the value repeatability b=[(Fc-Fi)/Fi]x100%
(b=[(|Fi-Fi|max)/Fi]x100%)
The relative error of the output backhaul is u=[(f-Fi)/Fi]x100%
2. Reading of force meter
The relative error of the display value q=[(F-Di)/Di]x100%
Relative error of the display value repeatability b=[(Dc-Di)/Di]x100%
(b=[(|Di-Di|max)/Di]x100%)
The relative error of the output backhaul is u=-[(d-Di)/Di]x100%
Where: Fi—the average value of the three-time process display value of the tensile tester; D—the display value of the dynamometer (check point); Fc—the value of the dynamometer three-time display value is far from the average value; f—the value of the tester backhaul; F—the value of the tester (check point); Di—the average value of the dynamometer three-time display value is far from the average value; Dc—the value of the dynamometer three-time display value is far from the average value; d—the value of the dynamometer backhaul.

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