Meeting the needs of Industry for Electrical Conductivity Reference Standards (MIECRS)

目前，NPL仅提供交流电导率标准，规定精度为+/-0.7%。波音标准BAC5651要求高于16.5MS/m的标准具有+/- 0.12MS/m的精度，高达60.5 MS/m（极值为+/-0.2%）。由于国家公共服务削减，新的波音和NIST校准标准不再可用。国家物理实验室在M4R项目下进行了一项测试（参考文献10643），并表明使用范德堡方法可以达到相当的精度，但需要更多的工作来改进测量方法和改进测量设备。提供符合UKAS标准的NPL直流导电性标准的能力将确保ETher NDE在该产品销售中的持续增长。

Currently NPL only offers AC Electrical Conductivity Standards with a stated accuracy of +/-0.7% of value.The Boeing standard BAC5651 calls for standards above 16.5MS/m to have an accuracy of +/- 0.12MS/m up to 60.5 MS/m (which at the extreme value is +/-0.2%).New Boeing and NIST calibrated standards are no longer available due to national public service cut backs.NPL have carried out a test under a M4R project (ref 10643) and shown that using the Van der Pauw Method they can achieve comparable accuracy but need more work to refine the measurement methodology and improved measuring equipment.The ability to provide UKAS compliant NPL DC Electrical Conductivity Standards would ensure ETher NDE's continuing growth in sales of this product.