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Originally Posted by Escapee
It is actually quite easy to calibrate with an oscilloscope that can trigger reliably on TV Line syncs, It could also be done with a counter timer locked to Droitwich 198KHz off air standard.
I would personally use x amount of 64uS TV lines from a demodulated off air anaologue TV transmitter to calibrate a timer to use for comparison. This would be more than accurate enough, it would then be a case of using the gatso flash to trip a monosatble set for the 500ms. This could compare the monosatble with the gatso falsh used to trigger it.
He is an engineer, so it's likely he also has access to this sort of equipment.
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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).