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用四种不同承压膜厚度的压力盒,以不同密度的粗、中、细砂进行标定的结果表明,在第一次加荷阶段,量测误差均在10％范围之内,在第二、三次加荷阶段,承压膜厚度为3毫米的压力盒的量测误差也在±10％范围之内。承压膜厚度为2.5毫米的压力盒,当外加压力在1.0公斤/厘米~2以上时,误差才能保持在10％之内。在卸荷和再加荷的情况中,误差值就大大超过了±10％的范围,最大甚至达到100％以上,这样大的误差主要是由于薄膜刚度不够,以致其滞后特性显著而造成的。
The results of calibration with coarse, medium and fine sands of different densities with four different pressure-film thickness press boxes show that the measurement error is within 10% of the first loading stage, and In the three-loading stage, the measurement error of the pressure cell with a 3 mm thickness is also within ±10%. For a pressure cell with a pressure film thickness of 2.5 mm, the error can be kept within 10% when the applied pressure is 1.0 kg/cm2 or more. In the case of unloading and reloading, the error value greatly exceeds the range of ±10%, and the maximum is even more than 100%. This large error is mainly due to the film stiffness is not enough, resulting in significant hysteresis characteristics.