It depends upon what he refers to by grounding. I assumed that he was just connecting each of the inductor leads to ground initially. He of course figured that this would eliminate any current flowing, but induced currents would continue as is well established. I am not knowledgeable about his level of expertise in electronics so I thought that he then opened one of the grounded coil ends and measured the voltage with the assumption that now there should be no signal, thus the grounded description.
The only way we will be able to determine what was seen is for a direct question to the measurer about his test configuration. Dave -----Original Message----- From: David L Babcock <[email protected]> To: vortex-l <[email protected]> Sent: Tue, Aug 14, 2012 3:20 pm Subject: Re: [Vo]:Re: ProdEngAssemble.avi - 1/2 volt grounded On 8/14/2012 1:51 PM, David Roberson wrote: He suggested that there was .5 volts across the coil when grounded. I assume that he broke the ground and then connected some form of meter across the turns. I suspect that this reading was not accurate and most likely external noise or possibly RF interference to his meter. Without making the measurements myself, I can only be skeptical as to the actual effects. Dave To me it looks simpler: only that he grounded one coil terminal so that he could conveniently measure the voltage at the other. This does imply that the coil circuit is normally "floating", which is possible if not likely. For an example of "convenient", he may not have trusted the accuracy or bandwidth of the usual handheld meter, or if a scope he may not have the money for a scope that uses a balanced differential dual probe, and so needed a single-ended measurement, - and thus the grounding. Before differential scope inputs were affordable, and a certain waveform just had to be seen, we on occasion had to "float" our scope at whatever ungodly voltage and waveform was there, to accurately see what was across a component. Tore the safety ground out of the scope power cord, and then, we were very careful! lol. Yours, Ol' Bab, who was an engineer.
