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class="info"><span>让需要校准、检测、检定的地方都有博计计量</span> <a href="http://wpa.qq.com/msgrd?v=3&uin=1455914156&site=qq&menu=yes" target="_blank"><img alt="qq" src="https://www.nbw1688.com/static/images/qq.gif"/>[在线咨询]</a> <small>时间:</small>2021-06-17</div> </div> <div class="con clearfix"> <p>何谓电桥的灵敏度</p><p>测电桥灵敏度时，为何Δn要尽可能大并估读一位？ 答：设某一待测电阻Rx在电桥倍率为K、电阻为R0下取得平衡，当电桥电阻改变ΔR0时，设电桥的检流计指针改变Δn格，则电桥灵敏度S定义为S = Δn /(ΔR0/R0); 灵敏度S反映了电桥对电阻相对变化量的分辨能力，是衡量电桥测量精度的重要参数。</p><p>测定电桥灵敏度时，Δn尽可能大并估读一位是为了减少相对误差，提高测量精度，因为Δn的读数误差是固定的，当Δn尽可能大并估读一位时，相对误差就小了。</p><p><a href="http://www.nbw1688.com" target="_blank">仪器校准</a>如果要求测量误差小于万分之五，则电桥的灵敏度应为多大？ 提示：由Rx = KR0得到S n RRRRKKRRxx0000, 由此，S ?Δn/(ΔRx/Rx) =……。（此处应取Δn = 0.5） </p><p>解：10001055 .0/4xxRRnS. </p><p><a href="http://www.nbw1688.com" target="_blank">仪器校准</a>关于认可周期内很少从事检测的认可项目如何认定？指的是检测参数、检测方法，还是包括产品标准？我国的标准体系现状是产品标准很多，一系列的产品标准检测参数和方法基本相同。在这种情况下，是否具有某些产品的检测经历，也可认为是其他同系列产品均具备相应检测经历？ 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