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Ralim / IronOS

Open Source Soldering Iron firmware
https://ralim.github.io/IronOS/
GNU General Public License v3.0
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Wrong temperature coefficient? with Hakko T7/T12/T15 tips #301

Closed patapovich closed 6 years ago

patapovich commented 6 years ago

Request a feature

There is a big error in set temp., temp. shown on display and real temp. when using Hakko T15 tip instead of original.

Set temp. Disp. temp. "Real"* Temp
100 152 75
150 192 150
200 240 195
250 284
350 370

*My measuring equipment is not quite up to the task

Also current temperature shown on display jumps a lot, while real temp. is staying reasonably stable.

Reasonably stable temperature regulation and display with Hakko tips.

Using Hakko tips and Handle with our iron. Adapter

From what I found out, the T12 temperature coefficient is 20-21uV/C.

I'am not not really sure what going on, because I would expected the error be the same for set and shown temperature.

Eldenroot commented 6 years ago

It is because you dont use the "original" tips. Maybe this could fix this: https://github.com/Ralim/ts100/issues/275

patapovich commented 6 years ago

I'm not sure the PID tuning by it self will resolve the problem.

The T12 tip thermocouple type is apparently different from "original" and there is a need for correction. What surprised me is that real temp is pretty close to set, at least for temperatures I can measure. Real-time temperature reading is off and not by specific offset.

Ralim commented 6 years ago

Reasonably stable temperature regulation

This will be improved by #275 hopefully.

The temperature offset is because you are not using official tips with the unit, so naturally these would have a different temperature response. I can get my hands on some Hakko tips and test this as well, but it might be a bit of time until this is implemented as a feature, as the Hakko tips have also led to some damaged units. Not sure exact cause, but I know two people who were using Hakko T tips and both ended up breaking the internal mosfet in their irons. (Works fine after upgrade though).

This should be fixable in future, but I dont want to encourage using Hakko Tips.

Eldenroot commented 6 years ago

Same here, I read many reports from users whose used non original tips with TS100. Many of them reported that it is not a good idea, after some time TS100 were broken.

JohnEdwa commented 6 years ago

as the Hakko tips have also led to some damaged units. Not sure exact cause, but I know two people who were using Hakko T tips and both ended up breaking the internal mosfet in their irons. (Works fine after upgrade though).

Can't really break a mosfet by any other way than overdriving it, one datasheet gives the TS100 mosfet (CJQ4953) a max rating of T<10s 3.7A while the TS100 and Hakko tips are supposed to be exactly 8.3ohm to give the rated 70W, 2.9A@24V. Get a crappy one-hung-low tip that is 15% off the spec and you'll cook the mosfet - seeing as one of my official TS100 tips measures 9.39 ohms (13.1% high), I don't think it's that unlikely.

Ralim commented 6 years ago

Going to close this, and count it as part of #303