Author Topic: EEVblog 1392 - No temp probe? No problem!  (Read 763 times)

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Online EEVblog

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EEVblog 1392 - No temp probe? No problem!
« on: May 12, 2021, 02:04:59 pm »
Think your multimeter doesn't have inbuilt temperature measurement? Think again!
Dave shows you a trick to measure ambient temperature with your multimeter without a temperature probe.



Followup video testing in the fridge:
 
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Online Wiljan

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Re: EEVblog 1392 - No temp probe? No problem!
« Reply #1 on: May 14, 2021, 03:42:47 pm »
I have a Keysight U1282A here, the display shows 18.4 deg for the meter internal.

If I select the Temp mode for ext probe and short the test lead ... it shows 18.4 just as you explained  :D

So my question: Can an external probe show lower than the room temperature?
I mean this is 0 ohm when leads are shorted so it will be hard to get a negative ohm
 

Offline gamalot

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Re: EEVblog 1392 - No temp probe? No problem!
« Reply #2 on: May 14, 2021, 03:46:52 pm »
I have a Keysight U1282A here, the display shows 18.4 deg for the meter internal.

If I select the Temp mode for ext probe and short the test lead ... it shows 18.4 just as you explained  :D

So my question: Can an external probe show lower than the room temperature?
I mean this is 0 ohm when leads are shorted so it will be hard to get a negative ohm

When using a thermocouple to measure temperature, it measures voltage instead of resistance.

https://en.wikipedia.org/wiki/Thermocouple

Offline David Hess

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Re: EEVblog 1392 - No temp probe? No problem!
« Reply #3 on: May 14, 2021, 04:31:31 pm »
My Tektronix multimeter has a dual display which shows the cold junction temperature as well as the thermocouple probe temperature.
 


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