A New Method of Correcting Frequency Response Error for a Digital High Frequency Voltmeter

摘要

The frequency response error of a digital high-frequency voltmeter with a silicon diode peak detector roots in high-frequency resonance error that is mostly produced by the components distributing parameters within the probe. Take the HF voltmeter frequency response measurement with a high-frequency mid-voltage standard apparatus; the global fitting of the resonance frequency versus the signal frequency was carried out with two-layered BP artificial neural network. Using the relationship between the signal peak-voltage, the resonance frequency, and the output DC voltage of the probe, the corrected HF voltage value was worked out. The testing results showed that the frequency response error was reduced from about 40% to 5% with the predicting resonance frequency by the trained BP network.