Is there a shortest wire consideration for building a K type thermocouple?
In my application I need 20cm probe lenght at most. Temperature to measure up to 250 max, mostly 220-230 range.
I figure out that silver solder works good for hot juncture.

Dear Sir,

Thanks a million times for your explanation,

it was very simple and straight to the point.

I have this question please;

If we have a TC type K connected to a Temp. PID,

Can we use two copper wires connected to Fluke DMM form one end and the other end of these two wires is connect at the PID exactly at the same TC terminals.

So the PID can read the temperature from the TC and at the same time the Fluke Digital Multi Meter can read the Temperature from the TC as well.

Do you think it will work, or the two copper wires will affect the reading ?

as i do not know the right gauge and length of these two copper wires ?

Please help Sir,

If you heat the centre of the yellow loop with the iron you'd expect very little potential difference between the meter cable ends, or am I missing something?

i was thinking if you had a block of ice and a bunch of thermocouples and six Peltier Thermoelectric coolers, maybe you could make an half decent battery in winter time.. probably too hot in Australia 🔋🇦🇺🧊🙇‍♂️

Question: Does the length matter??? I wanted to measure/calibrate my soldering iron temps. I was going to buy a 191 tool, but later thought getting a proper 2 channel device would have more uses. So, if I cut the leads down at the plug end of one of my probes, so I just have a little stub sticking out, that I can touch my hot soldering iron tip to, will it still read the same? Love all your videos, Thanks for sharing. I know this video is from 2013, hope you still check comments…

Nicely explained but there is an error there, I think, about the NIST chart. I believe that the horizontal line is actually the subdivision of temperature rather than the cold junction temperature. You can easily confirm that by checking that the last column value is identical to the first column of the previous row when negative and the to the next row when positive.

Awesome :). Thank you

Are naked probes that come with multimeters safe to immerse in liquids, assuming they don't corrode the metals? Somebody warned not to immerse the cable of a meat thermometer. How do meat and medical thermometers work? The don't show any internal temperature when unplugged.

Have watched a lot of videos on TC's and the people making a big deal about the bead on the business end of the TC wire. They go to great extents to make sure there are those same two types of wires through the entire length from the tip back to the meter. All you really need to care about is making only one transition.

When I worked for a US defense contractor in the 80's, I used to make thermocouples for the various temp tests from TC wire on spools of wire. I would cut off 10' of wire, strip and twist one end, and give it a blob of solder, then run the wire back to the patch panel, which was all standard nickle plated bus bars. No need for all the fancy plugs, extension cables, etc. Can use a 16 AWG extension cord if you need to. Besides, what you connect that TC to will not be made of the dissimilar metals.

Great stuff, thanks!

Can you make your own plug out of like a headphone jack or a USB?.