Abstract :
Using analog measuring instruments sometimes does not provide accurate results. Tool
Analog meters can only measure current signals in sinusoidal form. But on
In reality, the shape of the electric current signal is not always a perfect sinusoid.
The shape of the current signal changes according to the characteristics of the load on a device
Suite. So an RMS current meter is needed that can measure various types of current
waveform.
In this research, the current from the load is passed to the current sensor
converts the current into a voltage that represents the load current. Sensor output voltage
The current will be fed to the microcontroller to be converted into digital current data
and then it will be sampled 128 times the input voltage frequency. For
calculate the RMS current value using an algorithm from previous research
has been developed.
The test results show that this system can measure current
RMS up to 5 amperes with an input voltage frequency of 35 ? 156 Hz with
the linear load error is 0.496939% and the nonlinear load error is 0.413107%.