Measurement Devices: Tachometers

  • Thread starter MachX
  • Start date
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Hello All,

I am experimenting with DC motors and different speed settings, and I am looking for a way to measure RPM at different voltages and loads. I have been looking at different tachometers and trying to determine what my best option is. The reading does not have to be super sensitive, and I am trying to make it as simple as possible. So far I have found an analog and a laser hand-held tachometer which seems to be my cheapest option.

http://www.aliexpress.com/wholesale/wholesale-rc-tachometer.html

Anyone used these or have any suggestions for other tachometer solutions that are cheap and for small scale 0.25" or so shafts?

I know a device exists that will read rpm from a given motor based on voltage input, but unfortunately said device would be specific to its motor. I dont know if I want to try and build such a thing for the motor I have. :bugeye:
 
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A magnetic pickup will create a pulse train whose frequency is proportional to RPM. Ditto for an optical pickup. That laser device you mention is probably an optical pickup.
 

Ranger Mike

Science Advisor
Gold Member
2,105
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i have used the rubber wheel type hand held tachometer but really like the strobe light type. More expensive but much easier to get a good reading
 

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