01-11-2018 11:28 AM
Hi,
I need to interface two PT100 on myRIO 1900 in order to acquire two tempeartures.
In order to minimize the error due to the cablelength I woul perform a 4 wire connection, to do this Ineed to use a bride, but I don't understan hoe to connect the bridge to teh Aor B connectors of myRIO.
can someone help me?
regards
David
01-12-2018 03:40 PM
Have a look at the
I think the myRIO has no dedicated resistor measurement good enough for a Pt100
You get boards for about 5$
01-13-2018 07:22 AM
Hi Henrik,
thanks for your suggestion, I need also to acquire 2 resistance values(not RTD) but I need an extreme accuracy of measurements, so I would like to implement a 4 wire measurements do you have an idea about which one can be the best solution?
ciao
david
01-13-2018 04:40 PM - edited 01-13-2018 04:46 PM
@David15 wrote:
.. I need an extreme accuracy of measurements...
And what do you mean with 'extreme accuracy' ??
A colleague just go with a good ol' ASL F900 ... 😄
01-14-2018 08:28 AM
I
need to read milli ohm.
ciao
David
01-14-2018 11:59 AM
Oh, come on, what does it mean 'need to read milli ohm' ???
Please learn how to write and read metrological requirements 😉
If you need mOhm accuracy reading a 100 Ohm resistor (or Pt100) that is 10ppm .
Usually a job for a 8.5 digit meter and not a myRio 😄 see here
The trick is to use comparison techniques ... like a bridge