Speed sensor

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Speed sensor

Postby theknight1 » February 16th, 2017, 4:53 pm

My speed sensor for Concept2 model A seems to be broken...not sure if this is the cable or not. What does the signal supposed to look like if I connect it to a oscilloscope?
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Re: Speed sensor

Postby Ombrax » February 16th, 2017, 8:49 pm

I thought the Model A was all mechanical, no electronics.

Was yours upgraded?
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Re: Speed sensor

Postby jamesg » February 17th, 2017, 2:36 am

A series of impulses at around 30 Hz, if it's like more recent machines: three magnets and a coil. The wheel spins (guess) at 500 to 700 rpm.

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Re: Speed sensor

Postby Ombrax » February 17th, 2017, 2:52 pm

jamesg wrote:A series of impulses at around 30 Hz, if it's like more recent machines: three magnets and a coil. The wheel spins (guess) at 500 to 700 rpm.


This is a slight drift, but related to the OP's question, so hopefully he won't mind:

Given what I assume to be a fixed sensor coil and the three magnets that are on the flywheel, what's the difference between models, say C vs D or E?

I ask because I recently upgraded my Model C from a PM 2+ to a PM 3, and when I first connected the PM 3 to the sensor wire and rowed a few strokes nothing happened - I had forgotten that I had to change the model setting on the PM 3 to "C." I did that, and everything's been fine. The fact that the PM 3 needs to know what model it's on suggest that there must be some differences between the sensing hardware from model to model rower.
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Re: Speed sensor

Postby Carl Watts » February 17th, 2017, 5:47 pm

The Model A, B, C used a 3 magnet system, the Model D has a totally different system, possibly a 12 pole magnetic ring and a complete circuit board that is actually capable of putting out enough power to charge the batteries in the PM4.

The later version went through at least 3 revisions with a single coil and some through hole components to the later version which has a twin coil and surface mounted components.

I notice the latest version now uses a plug on the cable to the monitor thats a better fit due to the smaller diameter and the end of it is shaped so you can get your fingers on it better to grip it to pull it out.
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Re: Speed sensor

Postby Ombrax » February 17th, 2017, 8:04 pm

Thanks Carl - I didn't know that.
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