The instrument error that contributes to the greatest variability is the cuff size of the sphygmomanometer.

变异性中占比例最大的设备误差是血压计袖套的大小.

For an instrument error of less than 3 %,calibratethe pressure-indicating device in such a manner that known pressures are applied dynamically at approximately the same rate as in testing of paper.

对于误差小于3%的仪器，以与纸张测试大致相同的速率动态施加已知压力的方式校准压力指示装置。