Electronics > Metrology

100 OHM PRT readout suggestions

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itsbiodiversity:
Hello all!  I am new to the forum; however, I am not new to the field.  I am looking for some opinions on 100 OHM PRT readouts that have treated you right over the years.  Of course I am very familiar with the Fluke 1502 readout, and it is my favorite among those that I have used.  I am looking for more affordable options than the 1502, if there are any.  The unit must be capable of measuring 4-wire RTD measurements with very little uncertainty.  Current price of a 1502 is over $2k, and the unit only reads resistance / temperature.  I would really appreciate some recommendations of multimeters with good resistance accuracy so that the meter can be used for other functions than temperature.  I do not mind performing calculations of the temperature using the readout resistance.

sokoloff:

--- Quote from: itsbiodiversity on October 16, 2017, 03:25:45 pm ---The unit must be capable of measuring 4-wire RTD measurements with very little uncertainty.
--- End quote ---
"Very little uncertainty" is unfortunately not  a spec.

What spec are you willing to live with?

ap:
My recommendations are:
Keithley 2001 or 2002 (I m using a dedicated 2002 e.g. to measure the temperature of a resistance standard array). 3458A is fine too, but pretty expensive though.
If lower budget is desired then e.g. Keithley 2700.
Advantage of all of tese is that tehy are universla meters rather than just (imo overpriced) dedicated meters. Unless you use e.g. a 25 ohms PRT.

itsbiodiversity:
To be general, less than 0.08 degrees C.  The probe I have is a fluke 5627 100 ohm prt and has a temperature coefficient of 0.00385 ohm/ohm/degC nominal.  I may be wrong just estimating here so that would be around 0.0002 ohm accuracy or better to achieve the results I am looking for.  Please correct me if I am wrong making that calculation as I am on the go at this moment.


I will mention that I have used the 3458a in the past and love it also.  Are there any recommended multimeters that measure below 100 ohm with accuracy of this level?  I would prefer the 3458a over the 1502a even though the price is higher due the the available functions. 

VintageNut:
The DMM7510 has a 1-ohm 7 1/2 digit full-scale resistance range.

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