How do you measure DC current with a multimeter?
Procedure to Measure DC Current using Analog Multimeter
- Insert red and black probes to the multimeter in their respective slots, depending on very high or very low current measurements.
- Set range selector switch to DC measurement type of current and also select the expected range.
How do I connect to INA219?
Connect to the circuit
- Connect V+ to the positive terminal of the power supply for the circuit under test.
- Connect V- to the positive terminal or lead of the load. This puts the sense resistor in-line with the circuit.
- Finally, connect a wire from the negative terminal of the power supply to GND.
Which is I2C chip can measure current and voltage?
INA219: A voltage and current sensing chip using I2C INA219 The INA219 is a current measuring chip which can also measure voltage – actually it can only measure voltage, but cheats by measuring voltage across a known resistance.
How is the voltage measured in the ina219 chip?
The negative analogue input is used to measure the load voltage and hence, with the current measurement, the power dissipated in the load. INA219 Specification The total voltage between +Ain and -Ain must not exceed 0.3~26V. The device comes in two accuracy standards A, B with B more accurate.
How to measure high or low side voltage?
In a high side configuration the bus voltage measurement and power calculation can be retrieved accurately, however advanced hackers wanting to measure bus voltage in a low side configuration will need to cut the jumper connecting V+ to VBUS and connect the VBUS pin to the voltage bus.
What is the accuracy of ADC at 25°C?
At 25°C, the voltage accuracy spec for A and B parts is the same: 0.2% (typ) 0.5% (max). Over the full temperature range the accuracy is 1%. The resolution of the device is a little strange as the physical ADC bit width is 12 bits, but throughout the data sheet the bit range discussed as 15bits.