Extruder temperature , Need help

I am having a problem with the software and the Extruder temperature.

the Extruder temperature is at 21C(room temp) and the software read 86C(extruder exerciser).

the software is jumping around 31 then 86 and somthing in between. but most of the time at 86.

Using the "standard thermistor" from the reprap.org and a 0.01uF Cap.

I have read all i can find on this, but i think i am missing soemthing if someone could point me to the right place.


Barry

I was having this exact same problem last night. Make sure Extruder0_Capacitor(F) is 0.00000001 farads (it's 0.0000001 by default).

Thanks Owad..

that has seems to have worked. i was sure that i changed it but i copy and pasted and it has a room temp of 17C, it stop reading temps at 96C or 117C, I get I/O errors but it heats and reads very close temp to my digital thermometer, which died today and all i get is -50C. i am looking at a new one that has a K-type thermistor, any one know anything about K-Types?

BarryGlen..

Hmm

K-type thermocouples are a different kind of beast from thermistors. They're really just two different types of wire welded together, which produce a (really small) voltage when heated. They're usually a bit more expensive than thermistor-based measurement, but they've got some nice advantages (like they can measure well over 1000 degrees).

I use a cheapo thermocouple (from circuit specialists, I think) for calibrating. It is thin wire, so it has a fast response time. It has been far more durable than any of the cooking-type thermometers I've used, although that probably says more about the quality of the cooking thermometers than it does about the greatness of thermocouples.