Topics created by Gary 0

@dc42 Hey thanks for getting back to me.

I have experimented with moving the thermocouple and also installing a few capacitors here and there to try and remove the noise but nothing was working. Sadly I can't change the heating elements as they are custom made for our project and rather expensive. You can probably guess from the temperatures I'm dabbling with that we aren't using a 40w heater cartridge!

Well I'm going to tentitively say that I may have solved the issue I was having. I had setup the heating elements with PID control etc. However removing that and just having it setup as bang bang control with no reduced duty cycle or PID has removed the interference I was seeing around 950C. I can only guess that this was causing some signal to be induced in the thermocouple.

So for anyone else experimenting with super high temperatures with elements run off AC power just setup your heater with bang bang control.

@dougal1957 You lovely lovely person.

Asking me to post it made me go back through it with the appropriate paperwork in hand to check everything over before sending it through. And I spotted a rather obvious error, essentially trying to define the thermocouple type using the wrong variable.

Thanks for all your help folks. So handy to be able to bounce things off others in the know!