To accurately measure the instantaneous current output of a battery using a multimeter, follow these steps: Prepare the battery and multimeter: Ensure the battery is disconnected from any circuit. This is to prevent any external circuitry from affecting the measurement. Set up the multimeter: Set the multimeter to measure DC current.
If your product relies on stable voltage and current delivery, routine power supply current measurement should be part of your process—especially before deployment or shipment. The most common method for measuring current is to place a multimeter in series with the circuit.
Solution: Measure the internal resistance. How you can do that? Apply an additional known current and measure the difference in voltage. With that you get the internal resistance and with the measured current from above, you get the real battery voltage.
You can measure voltage battery with voltage reference. You need voltage reference with lower reference than you expect on battery (for example 1.235 V). Then you measure this voltage with your ADC. With this measurement you can now calculate ADC reference voltage, which should be equal to battery voltage.
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