Hi All,Something else I did today was verify my gap spacing between electrodes. 4 of the gaps are .05", but one is .061" and just happens to be the gap in which the fiber optic probe is looking at. So, the total gap is not 0.25", but .0261". So a little deviation there. Not really much of a change for arc voltage with only .011 difference, but still I wanted to "note" it. The gaps are used and need a good cleaning. The electrode assembly actually pulls out of the fan assembly as a 1 piece unit after disconnecting the 2 wires, so I really should take 10 minutes and clean it one of these days.
However, I was thinking about the gap light. I realize any light along the length of the tube in which I was monitoring with the fiber optic probe would saturate the transducer (regardless where the arc occurred along the lengths of the tubes). Because the other electrodes light is blocked by the fact that the tubes are epoxied to the pvc ensures other pipe gap light isn't affecting the bps measurement of this particular gap. Unlike current measurements at the cap or primary, this measurement is actually measuring the gap breaks itself without any outside influence (current phenomenon). When the gap fires, it emits light, and when it quenches, the light goes out. It's that simple. I think this particular measurement is actually an "honest" measurement of bps as it is the gap itself and does have issues with current phenomenon occurring before, during, or after. What you see is what you get. And that is something to take seriously about this particular test procedure and setup.
With other measurements, we look at waveforms and "attempt" to deduce the firing rate. With this setup, the human attempt to deduce firing rate is removed. I have tried to argue with my own measurements (to be a skeptic at all times), but I can find nothing wrong here and thus I look at other measurements in which I "can" make many assumptions.
Take care, Bart bartb wrote:
Hi All, Today I ran the coil at 140Vac and retested bps.I also measured input current at both 120Vac and 140Vac while running the coil.During the 120V measurement, current fluctuated between 12.7A to 13.7A = 13.2A average = 1.58 kva. During the 140V measurement, current fluctuated between 14.6A to 15.8A = 15.2A average = 2.13 kva.For the BPS Testing, I ran similarly as before, except this time I got rid of the switching power supply and simply installed some 9V battery's on the board to power the light transducer.The total recording time is 11.3263 seconds. Total breaks were 1176. BPS is then 104. So still pretty low.Photo of the setup: http://www.classictesla.com/temp/light%20transducer%20board.JPG Photo of the gap: http://www.classictesla.com/temp/spark%20gap%20fiber%20optic.JPGThe sample rate was set to 2500/s, so time divisions are 0.008 seconds. http://www.classictesla.com/temp/bps_1560_140VAC.gif Here's the various files (windaq, raw csv, filtered bps excel file): http://www.classictesla.com/temp/1560-140-1vac.WDQ http://www.classictesla.com/temp/1560-140-1vac.CSV http://www.classictesla.com/temp/1560-140-1vac.xls Take care, Bart _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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