干扰电治疗设备频率测试方法研究

Research on frequency testing methods for interference electrotherapy instruments

目的:对干扰电治疗设备频率的测试方法进行研究,并提出建议。方法:将某干扰电治疗仪一个通道的输出作为被测信号,使用功率分析仪或示波器,在同一环境中采用直接测频法、周期法、傅里叶变换法分别测试被测信号,并对测试结果进行分析。结果:3种方法均可实现干扰电治疗仪的频率测试,但是检测结果存在差异,采用直接测频法测试的效果要优于周期法和傅里叶变换法。结论:在测量干扰电治疗设备的频率,尤其是扫频信号相关的频率测试时,建议采用直接测频法。

Objective To explore the testing methods for the interference electrotherapy instruments and propose suggestions accordingly.Methods The output of one channel of some interference electrotherapy instrument was used as the signal under test.The test was executed with a power analyzer or oscilloscope in the same environment using direct frequency measurement method,period method and Fourier transform method respectively,and then the test results were analyzed.Results The three methods all could be used for the frequency testing for interference electrotherapy instruments,while differences were found between the results by the three methods.Direct frequency measurement method behaved better than period method and Fourier transform method.Conclusion It's recommended that direct frequency measurement method be selected for frequency testing for interference electrotherapy instruments,especially for the frequency test related to swept signals.