Fred wrote:
For flow, I think what I would do is make the opening time (which is 1ms +/- 2ms) completely negligible by making the overall flow time as large as possible (1 second of flow makes it 0.1%, 10 seconds 0.01%, etc).
Right, that's why I'm aiming to collect 100ml at an opening time
of around 20 seconds. The dead time should be pretty much
indistinguishable from error at that point.
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For dead time I'd likely do something similar to the car, and that is make 400 shots at 2ms, 200 @ 4ms and 100 @ 8ms and measure the output quantity of each, then do math. I'm not sure the dribbling trick is going to give a good answer, but it would certainly be interesting.
This would have the advantage of measuring opening and closing
time. Sounds like the best approach.
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As for the correct voltage, I'd be aiming to know dead time at at least three distinct voltages, one of them low (7 - 10 range), one medium (12 to 13), and one at 14.4, the rest can be extrapolated. You should be using similar fets to drive them too, and similar wire lengths, etc.
I can do battery voltage (~12v), and alternator voltage (~14.5v)
fairly easily with a second running vehicle. Low is more
difficult without discharging my battery to the point of
possible damage (or a fancy power supply I haven't got).
I'm going to do the tests on the car, with everything
wired/plumbed normally.
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Also, for flow, you should match the pressure, or do multiple pressures to get a feel for that curve.
Hope this doesn't muddy the water even more.
Fred.
Thanks Fred,
Sorry for polluting your triumphant thread with this Daniel, I
had meant to start a new one.