level stability meaning in English

电平稳定性
水平稳定性

For many reasons , in the velocity measurement of the rotating mirror , there are some technical difficulties to abtain high level stability , emi ( electro magnetic interference ) resistance and the precision , and the related problems have not been solved effectually
由于种种原因,获取高稳定性、高抗电磁干扰和高测量精度的相机转镜速度存在很大的技术难度,没有得到有效解决。