Author Topic: Fluke temperature measurement  (Read 1207 times)

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Offline CicadaTopic starter

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Fluke temperature measurement
« on: May 02, 2022, 08:01:41 am »
Hi

I have a Fluke 87V.

Looking through the manual I see they say "use  80TK Thermocouple" I have and RTD (Pt1000) and used it with my meter.

Measurements:

Temp (C)     Resistance
0                 857                         ice water
34.5            1113                        body temp
100             1600                        boiling water @ sea level

The 34.5 value was calculated from the other measurements.

My question:
Why does Fluke only cater for thermocouples to give out a converted temperature reading?
It would have been nice if they could add a facility to convert resistance readings directly to temperature readings after the user did some sort of a rudimentary calibration, ice water & boiling water. With the knowledge that there will be +/- 2C errors

This would be good enough for some applications. I don't work with temperature readings often so am I a bit naive here?
« Last Edit: May 02, 2022, 08:11:01 am by Cicada »
 

Offline HighVoltage

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Re: Fluke temperature measurement
« Reply #1 on: May 02, 2022, 08:47:53 am »
Its easy to convert a Thermocouple voltage to temperature for handhelds.

Most good bench DMM have a selection of temperature sensors to choose from, including platinum resistance in 2 and 4 wire mode.
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Offline HKJ

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Re: Fluke temperature measurement
« Reply #2 on: May 02, 2022, 09:01:47 am »
Its easy to convert a Thermocouple voltage to temperature for handhelds.

Not really, RTD is much simpler, but with a PT100 the wire and connection resistance would be a PITA.

There is a few handheld meters that support RTD sensors and TestController can do the conversion for any supported meter or it can be done manually in TC's calculator.

In this article I list supported thermosensor for a few high end meters: https://lygte-info.dk/info/DMMHigh-end%20UK.html
 

Offline alm

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Re: Fluke temperature measurement
« Reply #3 on: May 02, 2022, 09:05:43 am »
Temperature measurements on handheld DMMs are geared at industrial and HVAC applications. I guess thermocouples are more versatile and convenient due their size, temperature range and robustness.

Also front panel space in terms of range switch settings and buttons are restricted. Although I guess for a menu-based meter like the Fluke 289 they could have easily added it. Obviously there would be no support for three or four wire measurements of Pt100 sensors.

Offline BeBuLamar

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Re: Fluke temperature measurement
« Reply #4 on: May 02, 2022, 02:15:46 pm »
I thought the PT1000 resistance would be 1000 ohms at 0 degree C.
 


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