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A Frequency Response Measurement Method of Leakage Current and Touch Current

A technology of frequency response and contact current, applied in frequency measurement devices, frequency-to-amplitude conversion, measurement using digital measurement technology, etc., can solve problems such as limiting the high-frequency characteristics of operational amplifiers, and achieve enhanced capabilities, reliability, and safety Guaranteed effect

Active Publication Date: 2020-11-10
青岛艾诺仪器有限公司
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Problems solved by technology

[0006] Op-amp IC devices can generally amplify low-frequency signals according to the theoretical design ratio, but in the high-frequency band, the internal transistor base input impedance and input capacitance of the op-amp form a low-pass filter, which limits the high-frequency characteristics of the op-amp

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  • A Frequency Response Measurement Method of Leakage Current and Touch Current
  • A Frequency Response Measurement Method of Leakage Current and Touch Current
  • A Frequency Response Measurement Method of Leakage Current and Touch Current

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Embodiment Construction

[0026] A method for measuring the frequency response of leakage current and contact current, comprising the steps of:

[0027] Step 1. Perform hardware compensation for high-frequency analog signal attenuation through the frequency response measurement circuit:

[0028] The frequency response measurement circuit is as figure 1 Shown: Vin+ of the signal under test is connected to the non-inverting input terminal of the fourth ADI operational amplifier chip (ADI4) through the seventh resistor (R7), and Vin- of the signal under test is connected to the fifth ADI op-amp chip through the eighth resistor (R8). The non-inverting input end of the put chip (ADI5), the inverting input end and the output end of the fourth ADI op-amp chip ADI4 are connected to the inverting input end of the sixth ADI op-amp chip ADI6 through the ninth resistor R9 and the sixth ADI op-amp The inverting input terminal of the chip ADI6 is connected to its output terminal through the twelfth resistor R12, th...

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Abstract

The invention relates to a frequency response measuring method for leakage current and contact current. The method comprises the steps of performing hardware compensation on high-frequency analog signal attenuation through a frequency response measuring circuit; then capturing a high-frequency signal through a high-frequency capturing circuit; and finally performing software correction on the response signal through a CPU. According to the method, at aspects of hardware compensation and software correction, the frequency response testing method for the leakage current and the contact current is designed. When the frequency of a tested current signal is higher than 100kHz, hardware compensation and software correction are performed on signal attenuation, thereby satisfying a standard measurement requirement. The frequency response measuring method further improves capability and reliability for testing the leakage current and the contact current. An instrument using the method can be adapted to electric appliance product safety testing of more industries, thereby settling a problem of measurement accuracy for signals with higher frequencies for electric appliance production enterprises, and supplying better safety insurance for uses who purchase the electric appliance products.

Description

technical field [0001] The invention relates to a frequency response testing method, in particular to a frequency response testing method of leakage current and contact current. Background technique [0002] Leakage current and touch current test bandwidth are required to meet the frequency range of "DC ~ 1MHz", and the frequency response meets the requirements of Appendix L in "GB / T12113-2003 Measurement methods for touch current and protective conductor current". However, none of the existing leakage current testers and touch current testers in the industry can meet this requirement. [0003] The leakage current refers to the current flowing in the path that is not expected to conduct electricity, except for the short-circuit current. Touch current is the current that passes through the body of a person or animal when it touches one or more accessible parts of an electrical installation or electrical equipment. The frequency response is the frequency function relationshi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/06G01R19/25
CPCG01R19/25G01R23/06
Inventor 朱文营孙其政周龙王岩崧
Owner 青岛艾诺仪器有限公司
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