I am going to link to this on facebook Harry
On Wed, Jun 26, 2013 at 2:21 PM, Berke Durak <[email protected]> wrote: > Allow me to summarize the DC injection hypothesis: > > - It is theoretically possible to add DC to provide ~3kW of power that > would be invisible to the PCE-830. > > However: > > - Given the size of the wires, I guess that amperage would need to be > below 50 A. Otherwise the wires would heat up too much and this would > show on the thermal camera. > - This means that a DC offset of >60 V is required for 3kW injection. > - This means that the scammer must be confident that any instrument or > device connected would tolerate a >60V DC offset. This is a large > offset. As the DC resistance of the primary winding of transformers > is small compared to their reactance at 50 Hz, the extra DC would > probably destroy any attached transformers. > - The use of any electrical instrument capable of detecting DC would > need to be prohibited. A 5$ multimeter can detect DC. So do > oscilloscopes, or Fluke power analyzers. These would have to be > prohibited. > - Any significant DC current will produce a significant DC magnetic > field nearby. Such a field is easily detectable by most recent > smartphones or a simple compass. > - Temporarily switching the extra DC power off when DC-capable > instrumentation is used wouldn't be possible, as the temperature would > drop rapidly and this would immediately show on the IR video / temp > curve. > > -- > Berke Durak > >
