Posted by Robert Daniel on 12/1/2015 to "Smart" Meters
This paper intends to demystify some components of the Landis + Gyr Focus AXR-SD. This meter and other smart meters have triggered electrical sensitivity in people who did not know it had been introduced into their environment. It is presented with the belief that good technical information is essential to countering the rush into a poorly conceived “upgrade” to a smart grid. That our electrical infrastructure needs upgrading is not in question. However, layering high-tech components on top of aging much lower tech components while largely ignoring the issue of electrical sensitivity even as the evidence is coming in that smart meters are aggravating the problem is not in the public interest.
This paper presents evidence based on manufacturer specifications and field measurement that the switching frequency of a Landis + Gyr smart meter SMPS is about 130 kHz. Further, that this creates a harmonic-rich signal that is readily induced in the hot legs of a 100-amp residential service entrance. Evidence from field measurement is also presented showing that this harmonic-rich switching frequency is radiated from the meter.
Studies are coming out that show these frequencies, sometimes called intermediate frequencies, from common devices can do biological harm, especially if there is direct contact between ones body and the device.
This paper also shows the current waveforms of two switching power supplies. We see harmonic distortion indicating a low power factor and a spectrum analysis of this harmonic distortion. The paper explains how these images can be used for product identification. Power factor correction of a SMPS will change any such signature and quite possibly reduce the likelihood of making a positive identification of the associated device. Power factor correction has no effect on the switching frequency or its harmonics.
Read the rest of the paper here