PM3 Erratic Force Curve

Maintenance, accessories, operation. Anything to do with making your erg work.
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jojobings
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PM3 Erratic Force Curve

Post by jojobings » February 11th, 2024, 12:25 pm

Hi There,

I have a model C erg and upgraded it with a 2nd hand PM3. During the refurbishment process I‘ve replaced: chain, bungie, axle and sensor, update PM3 firmware. The machine works great. The only thing I am not persuaded is the looks of the force curve (see links below, always last quarter). Any idea what could be the cause and how i could fix it?

Pictures:
https://ibb.co/cXP6L4W
https://ibb.co/1LRX3g7
https://ibb.co/X5KSqYc

Any help is highly appreciated :)
Jojobings

JaapvanE
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Re: PM3 Erratic Force Curve

Post by JaapvanE » February 11th, 2024, 5:11 pm

Could be because the Model C flywheel/sensor only produces 3 signals per rotation, where a Model D flywheel/sensor produces a continuous signal based on 6 magnets. So it has a lot less data to work on.

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Carl Watts
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Re: PM3 Erratic Force Curve

Post by Carl Watts » February 11th, 2024, 8:12 pm

Wouldn't worry about it, curve looks a good overall shape.

Better data comes when you use a PM5 and ErgData and you can start getting some actual handle loads in Kg.

Probably a 1st Gen PM3, what firmware is it running ?
Carl Watts.
Age:56 Weight: 108kg Height:183cm
Concept 2 Monitor Service Technician & indoor rower.
http://log.concept2.com/profile/863525/log

jamesg
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Re: PM3 Erratic Force Curve

Post by jamesg » February 12th, 2024, 1:20 am

Could be you're using your arms at the catch, so finding yourself in a difficult posture at the finish. The hump will come sooner if you use the legs first.
08-1940, 183cm, 83kg. Last seen MHR 140.
2024: stroke 6 W-min @ 20-21. No times yet, now using WODs.

jojobings
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Re: PM3 Erratic Force Curve

Post by jojobings » February 18th, 2024, 11:35 am

jamesg wrote:
February 12th, 2024, 1:20 am
Could be you're using your arms at the catch, so finding yourself in a difficult posture at the finish. The hump will come sooner if you use the legs first.
Thanks for the reply. I manage to get smooth curve on other ergs (with PM5) at the rowing club so I think that at least not all occurrences are due to technique.
Carl Watts wrote:
February 11th, 2024, 8:12 pm
Wouldn't worry about it, curve looks a good overall shape.

Better data comes when you use a PM5 and ErgData and you can start getting some actual handle loads in Kg.

Probably a 1st Gen PM3, what firmware is it running ?
I uploaded the only version that the Utility Tool offered when connected which is version 332. The Datecode is 2009. Both suggests that it is a 2nd Gen screen or is it possible to upload the wrong version?

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Carl Watts
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Re: PM3 Erratic Force Curve

Post by Carl Watts » February 18th, 2024, 5:48 pm

V332 means its a 2nd Gen PM4 so that's still a good monitor but they no longer release new firmware updates anymore its all moved onto the PM5 now.
Carl Watts.
Age:56 Weight: 108kg Height:183cm
Concept 2 Monitor Service Technician & indoor rower.
http://log.concept2.com/profile/863525/log

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