周期计 meaning in English

cycler
cyclometer
period meter
periodmeter

The calibration of a frequency ( time interval or period ) counter will basically include timebase calibration , and frequency ( time interval or period ) measurement accuracy check at 6 different test points . calibration at additional test points can be arranged on demand
一个频率计(时距计或周期计)的校正工作基本包括时基校正及按六个不同测试点进行频率(时距或周期)准确度的检查。额外试点的校正服务，可应要求而安排。