Experience with Electronic Resistance Simulation?

C

Carl_E

#1
An associate is being encouraged to dump his 'old technology' but trusty resistance decade box used to check calibration of RTD inputs for a handheld electronic multipurpose calibrator by a big name test and measurement instrument vendor. Combining instruments has a certain appeal. Multipurpose means its supposed to do the industrial basics: source current, DC volts, and resistance for RTDs for calibrating analog inputs.

Back in the early '90's I had a bad experience with a calibrator that was supposed to be a resistance source for calibrating 100 ohm DIN 385 RTD inputs. It would not work on 3 of the 4 different devices we had. (Any of the devices will do a reasonable job reading ohms and doing conversions to temp, but this sourcing resistance, not reading resistance)

I'm not sure how a dynamic device substitutes 'resistance' into a live circuit with an external constant current pump, but my ignorance shouldn't matter, it was marketed for RTD input calibration. (In keeping with modern technology, the details of what and how it was supposed to work were unpublished, apparently reserved for the manufacturer's elites.)

The manufacturer was located in western Europe and had only a sales office in the US, and was unable to resolve our dissatisfaction with the dysfunctional resistance source.

We returned the device after our 30 day trial was up.

Since then, I've been skeptical of claims of dynamic resistance source devices. Maybe that one was an early poor design, then again, maybe they're all flakey.

My associate will only pursue this on a trial basis, but I'm curious as to whether anyone here has had any positive experience with non-decade box, electronic simulated resistance sources that they'd be willing to share?
 
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BradM

Leader
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#2
Hello Carl! :bigwave: Welcome to the Cove!

I have used the Fluke 741 for simulating RTD signals with decent success. Apart from that, we still use a decade box. There is just no substitute for high and low ranges of resistance, IMHO. :)
 
D

dv8shane

#3
My associate will only pursue this on a trial basis, but I'm curious as to whether anyone here has had any positive experience with non-decade box, electronic simulated resistance sources that they'd be willing to share?
I have used the simulated resistance function on the Fluke 55XX series multifunction calibrators and they do the job. I have also seen these breakdown. I personally prefer a Genrad or similar 0.01% accuracy decade box as they have shown to be extremely reliable year after year and have more uses. It is also usually less expensive to calibrate a decade box compared to an active source.
 
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