Reading Pyranometer voltage

Other Hardware Sensors
1

Hello,

I'm doing a meteorological station with some sensors.

One of them is a pyranometer, a sensor that measures the global solar radiation, and here's the problem.

The pyranometer sensor output has a maximum of 10mV, has a coaxial cable, the shield is positive and the center condutor is negative, and has a resistor across the leads of the cable.

Questions:

Is it right to connect one wire (positive) to analog (and other to ground) and measure the voltage in?

How can i measure values between 0mV and 10mV, if arduino has a 4.9mV "length unit"?

Is it necessary to amplify the signal?

Thanks

2

Is it necessary to amplify the signal?

Yes, and probably to invert too.

3

How can i measure values between 0mV and 10mV, if arduino has a 4.9mV "length unit"?

Use OPA as amplifier, JFET input stage. LF351 should be o'k for your application. Search a data sheet, it includes schematic drawings and app. notes.