I am sure that all settings for the Digital Voltmeter sensor are correct, but it seems to have error in the reading. How can I correct this error?

The Digital Voltmeter and 4-20mA sensors have an input as analog signal which will be converted to digital using an A/D converter. Normally, the A/D converter is calibrated in production process. But, you also can do it by following the steps below. On the web interface, turn off an Autosense for port#1. To do this, Go to the Sensor setting on the web interface by clicking on a ?Sensor? tab. On the bottom of the left side menu, click on ?Autosense?. Select ?Disable? for the port# 1. Then, click ?Save?. Connect 1.25VDC to RJ45 port# 1. The 1.25V is the voltage across pin 7 and 8 of the cable plugged into the RJ45 port. Set a Digital Voltmeter sensor online on this port. We only focus on a Raw Analog, so you do not need to change any settings. a. Go to the setting page of the DC sensor at port# 1. Select ?Online? for Go Online/Offline field. Then, click ?Save?. Run snmpset command as snmpset .1.3.6.1.4.1.3854.1.2.2.1.80.0 i 0 Replace with the IP address of your sensorProbe, and with the administrator password. The raw analog reading from the web interface should read 500 (+/-5). Please note that all RJ45 ports use the same A/D converter. Therefore, the calibration on any port will also have an effect for other ports. And, an error for each sensor is different due to components (e.g. resistors, capacitors) on the sensor. So, it is possible that the same input value will not be read the same for different sensors on the same sensorProbe.