Etalonnage balance UWE NJW-300


Etalonnage balance UWE NJW-300

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Lecture du guide Euramet cg18 sur l'étalonnage des balances:

Repeatability test
The test consists of the repeated deposition of the same load on the load receptor, under identical conditions of handling the load and the instrument, and under constant test conditions.

The test load(s) need not be calibrated nor verified. The test load should, as far as possible, consist of one single body.

The test is performed with at least one test load L_T which should be selected in a reasonable relation to Max and the resolution of the instrument, to allow an appraisal of the instrument performance. For instruments with a constant scale interval d a load of about 0.5 Max ? L_T ? Max is quite common; this is often reduced for instruments where L_T would amount to several 1000 kg. For multi-interval instruments, a load below and close to ?Max?_1 may be preferred. For multiple range instruments, a load below and close to the capacity of the range with the smallest scale interval may be sufficient. A special value of L_T may be agreed between the parties where this is justified in view of a specific application of the instrument.

The test may be performed at more than one test point, with test loads L_Tj, 1 ? j ? k_L with k_L = number of test points.

Prior to the test, the indication is set to zero. The load is to be applied at least 5 times, or at least 3 times where L_T ? 100 kg.

Indications I_Li are recorded for each deposition of the load. After each removal of the load, the indication should be checked, and may be reset to zero if it does not show zero; recording of the no-load indications I_0i may be advisable, the status of the zero-setting or zero-tracking device if fitted should be recorded.