Investigation of the Influence of Random Interferences on the Error with Frequency Conversion Electrical Signals Information Systems Power Supply

The study substantiates the current scientific and technical problem of developing precision methods for measuring the parameters of electrical signals (usually harmonic voltages), which will allow to create a fairly simple information systems power supply with desired characteristics. The process of measuring the frequency (period) of a sinusoidal signal based on the conversion of voltage into the frequency of pulses is investigated. This method has pronounced filtering properties with respect to interference. In particular, if the interference is harmonic with a frequency multiple of the frequency of the measured signal, the error caused by interference is virtually absent. Also, this method has a short measurement time, no more than one or two periods of the studied signals, which is especially important when measuring infrared frequency signals.