Thread: Mach3 VFD PWM signal...
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26-03-2016 #11
Make sure you don't have the lead plugged into the current connectors marked "A" or "mA" - For voltage they should be plugged into "COM" and "V". Its very easy to forget.
Graeme
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26-03-2016 #12
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26-03-2016 #13
Thanks guys,
Definitely on the volts, this meter only has three sockets - V/mA, Com, 10A and i only used the Com and V/mA ones 99% of the time.
I can't see lead capacitance having any effect here, surely it should be a measurable 0 to 10v Dc signal going to the VFD?
I know 4-20mA can be a pain to measure sometimes unless its loaded properly but 0-10v?
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26-03-2016 #14
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26-03-2016 #15
Bugger, sounds about right for my luck.
But then how the heck does it manage to work at all?
Might be worth putting the 'scope on it?
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27-03-2016 #16
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27-03-2016 #17
I think he meant a proctoscope
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27-03-2016 #18
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27-03-2016 #19
No I meant a proctoscope ! Happy Easter Clive..
Serious suggestion now - If you have an analogue meter these can have impedances as low as 5000 ohms per volt. All electrical measuring devices draw current from the circuit and this affects the circuit (experts can get precious here, but I am simplifying !). Having said that, I would not expect the BoB to be such a high impedance source as to have a drastic voltage drop when meter is put on it.
As Jazz says, it could be a dodgy Bob. I have never met a Dodgy Bob, but I do know a bloke called Dodgy Dave.Last edited by cropwell; 27-03-2016 at 02:03 PM.
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27-03-2016 #20
Yep happy Easter Rob I was just jesting Avo 7 days and valve volt meters.
..Clive
The more you know, The better you know, How little you know
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