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- Check for continuity between 12 V, ISO12 V, GND, ISO GND, and 5 V (all of these should be isolated from each other).
- The board can now be powered by connecting a power supply set to 12 V between 12 V and GND. A current limit of 20 mA should be sufficient.
- Measure the voltage between the isolated 12 V and ISO GND, and 5 V and ISO GND.
- Turn off the power supply.
Current Sense Output (INA240)
- Supply 12 V between 12 V and GND.
- Connect a wire to the connector near the center of the board labelled VREF.
- Measure the voltage between the wire and ISO GND. The value should be about 2.5 V.
- Connect a wire to the connector near the center of the board labelled IN+.
- Without the shunt resistor connected, connect a power supply between the positive and negative terminals. Apply a range of voltages across the positive and negative terminals between -20 mV to 20 mV. Measure the voltage between VREF and IN+. The voltage should be 1 V for each 10 mV across the positive and negative terminals (i.e. -2 V with -20 mV, 0 V with 0 V, and 2 V with 20 mV).
- Turn the power supply off.
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