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How to program the CR850 and CR 1000 to read only current (mA)


Unilab Dec 19, 2022 10:58 PM
Dear friends, how to program the CR 850 and CR 1000 in ?CR Basic to read only current (mA)

I need to measure and collect the data in mA. and how to connect this to the CR850 Cr100?

L - R - ground ?

Note: I don't want to convert mA to mV, just read in mA.

Hug to everyone.

smile Dec 20, 2022 06:12 AM

Hi

to measure the mA, however, you must at least electrically convert to mV. The CS CURS100 module does this. By doing this the logger is able to measure and in the reading multiplier you can convert into mA, dividing the mV by 100. Using Ohm's law mV=mA*Ohm. The precision resistance and very stable in temperature contained in the CURS100 makes the measurements precise even when there are strong temperature changes.

Smile


Unilab Dec 29, 2022 05:13 PM

Thanks very much Smile!

I tried to configure it but I couldn't.

TO CONVERT mA in mV >>>>

'Generic 4-20 mA Input measurement 'Measure'
VoltDiff(Anemometer,1,mV2500,3,True,0,_60Hz,0.0625,-25)


'##############################################################

TO READ IN mA >>>>
Anemometro_mA = Anemometrer/100

Do you Help me please? 

I need to measure from 4 to 20 mA.

Best Regards


smile Dec 31, 2022 07:40 AM

Hi,

to convert mV to mA you need to take a reading in mV, while the instruction you posted seems to convert in units of wind speed, for example m/s. Try to eliminate the mult and offset in the instruction and use only 1 as mult and 0 as offset, then the mV/100 conversion will work for you.

IE

VoltDiff(Anemometer,1,mV2500,3,True,0,_60Hz,1.0,0.0)

Good end and a happy and prosperous new year.

Smile


DennisCilley Jan 12, 2023 01:32 PM

This post is under review.

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