Campbell Scientific CS300 CS300 Silicon Pyranometer - Page 13

CS300 Pyranometer Recalibrate the CS300 every three years. Obtain an RMA number before returning the CS300 to Campbell Scientific, Inc. for recalibration. 7. Troubleshooting Symptom: -9999 or radiation values around 0 1. Check that the sensor is wired to the Single-Ended channel specified by the measurement instruction. 2. Verify that the Range code is correct for the datalogger type. 3. Disconnect the sensor leads from the datalogger and use a DVM to check the voltage between the red (+) and the black (-) wires. The voltage should be 0 - 200 mV for 0 to 1000 Wm-2 radiation. No voltage indicates a problem with either the photodiode or the shunt resistor, both of which are potted in the sensor head and can not be serviced. Symptom: Incorrect solar radiation 1. Make sure the top surface of the sensor head is clean, and that the sensor is properly leveled. 2. Verify that the Range code, multiplier and offset parameters are correct for the desired engineering units and datalogger type. NOTE Jumps of 3 to 6 Wm-2 are typical of CR200(X) measurements, due to the 0.6 mV CR200(X) resolution and the 0.2 mV/Wm-2 CS300 sensitivity. 9