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在现场工作条件下,对工程机械进行实测时,粘贴在试条上的电阻应变片与电阻应变仪之间由于距离较远,需要用长达十几米甚至几十米的导线连接起来。因为导线本身具有一定的电阻值,这样导线电阻就相应变片串联接在应变仪测量电桥的桥臂上。导线电阻成为桥臂电阻的一部分,但是导线电阻并不产生应变效应,从而引起测试结果的误差。
In the field working conditions, the actual measurement of construction machinery, pasted on the test strip between the resistance strain gauges and resistance strain gauges due to the longer distance, you need to use up to ten meters or even tens of meters of wire connected together. Because the wire itself has a certain resistance, so that the wire resistance in the corresponding strain gauge connected in series on the strain gauge bridge measuring arm. The lead resistance becomes part of the leg resistance, but the lead resistance does not create a strain effect, causing errors in test results.