英语翻译All weighing equipment should be tested using known test

英语翻译
All weighing equipment should be tested using known test weights or some other agreed method.Belt weighers may be tested and calibrated using test chains although running a batch of pre-weighed material is preferable as it tests the complete system by measuring totalised weight in an operating environment.The Contractor should be able to demonstrate accuracy and repeatability in the Acceptance Tests.The test procedures should be submitted to the Engineer for approval before installation commences.The Contractor should provide all equipment and materials necessary to carry out the test weighing and calibration procedure.It may be necessary to provide a typical sample of the material to be weighed out for the setting up of weigh feeders.