在应变片使用中,应变片与贴应变片的结构(它一般是导电的)之间的绝缘电阻起很大的作用。绝缘电阻<10 MΩ时,一般情况下干扰已经较大。因此,应变片仪器制造厂也提供绝缘测量仪。这种仪器只能用直流电压测量,而应变片也常常载频工作。然而,引起干扰的绝缘电阻与频率有关,例如在与5kHz 载频情况下,根据应变片的种类和情况其绝缘电阻比在 In strain gauges, the insulation resistance between the strain gauge and the structure of the strain gauge (which is generally conductive) plays a significant role. Insulation resistance <10 MΩ, under normal circumstances, the interference has been larger. Therefore, strain gauge equipment manufacturers also provide insulation measuring instrument. This instrument can only use DC voltage measurement, and strain gauges often work with carrier frequency. However, the insulation resistance causing interference is frequency dependent. For example, in the case of a carrier frequency of 5 kHz, the insulation resistance ratio depends on the type and circumstances of the strain gauge