电阻应变仪是常用的电测仪表。尽管我们经常使用它来测试各种参数,但对其幅频与相频特性却缺乏应有的分析。一般情况下,被测参数用同一型号的应变仪,测量信号的频率相近。可以认为,每个通道被测信号均被滞后了同样的相位,它们之间时间上的相互关系仍然 Resistance strain gauges are commonly used electrical measuring instruments. Although we often use it to test a variety of parameters, but its lack of proper analysis of the amplitude and phase frequency characteristics. Under normal circumstances, the measured parameters with the same type of strain gauge, measuring the signal frequency similar. It can be considered that the signal under test is lagged by the same phase for each channel, and the temporal correlation between them is still