EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: 97hilfel on December 26, 2016, 06:02:46 pm
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Hello everybody,
I try to measure the speed of a 4-Pin PWM fan with a arduino, so far my values are correct and have a precision from about .3-.5Hz compared with my Tektronix TDS2014 (probably no the dugs guts). Now the problem: my values are kind a jumpy and I already tried a few things but I always cant finish the taught and end up with a "meh"-solution which does not what she should do. Does somebody of you have a little idea in his box how I can smooth the calue? I get an update of the last value about every 100ms-500ms a little depending on my settings of the system.
Have a nice evening Felix
EDIT: Complete rewriting
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At slow timebase settings your Tek is probably in "Roll" mode, hence the periodic screen updates.
If you want to have a stationary waveform you're probably better to set up for a "Single shot" event and/or use a Trigger setting for say a pulse period. Hunt through the Trigger menu to see what options you have.
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(probably no the dugs guts)
You mean "the duck's guts".
This is a technical forum.
We are engineers.
Our statements must be correct.