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Originally Posted by scastle
My point was that I don't think he set out to test IF Gatso's are accurate. I think he set out to prove they weren't. I do realise he probably had access to equipment that could have been used to calibrate his timer (wether he did or not is another matter).
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We have just been discussing this one in work this morning, one of the guys here suggested a remote flasher used for photography could probably be used to trigger a pulse to be read on the oscilloscope. It wouldn't matter about the delay it took for the trigger, because it would be the same for both flashes, the only point to be sure about would be the recovery time between triggers.
I think this system could be set up and calibrated using a counter timer locked to the national off-air frequency standard 198KHz. It would be spot on accurate and there are many engineers in a similar position to myself who would have access to the equipment. I see no reason why his measuring method couldn't be as accurate as the company who manufacture it.
If it's locked to the off-air reference when in use, there could be no arguments about it's acuracy as its a national tracable NCAS standard.
very interesting
