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CNR4 Net Radiometer to an AM 16/32 Multiplexer

taiello Jul 6, 2020 02:45 PM

Hi Everyone,

I'm attempting to create a datalogger program for a CR1000 and I will have three CNR4's to connect to it along with other weather instruments. I've been using short cut to create the program outline, but it won't let me connect the CNR4's to the AM16/32 multiplexer. Is it possible to code the program so I can connect the net radiation wires to the multiplexer (four H/L differential channels), then connect the temperature wires to the CR1000 (one SE channel and one VX channel)?

Thanks,

Tim

JDavis Jul 6, 2020 09:00 PM

Each solar component of the CNR4 will be a simple differential voltage measurement. Those could be put into ShortCut on the multiplexer, and just need the correct multipliers put in.

The thermistors are measured with a half bridge (BrHalf). The equations are shown in the sensor manual. The program would need a calculation to get the resistance of the thermistor. Then, you need a calculation to convert to temperature.

With the temperature, you may add in the correction for the long wave measurements.

All the calculations in practice may be tricky to add in ShortCut, but should be possible.

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