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Power Validation
- Check for continuity between 12 V, -12 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.
- Measure the voltage between the isolated 12 V and ISO GND, and 5 V and ISO GND.
Current Sense Output
- Measure the reference voltage by probing the testpoint near the center of the board labelled VREF. The value should be about 2.5 V relative to ISO GND.
- 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. Measure the voltage between VREF and IN+. The voltage should be 1 V for each 10 mV across the positive and negative terminals. For example, -2 V with -20 mV, 0 V with 0 V, and 2 V with 20 mV.