Smps input current measurment

[Mohan mrperfect]

Hi all,
This is Mohan,

Actually i tried to measure input current of smps(3 phase input), to make smps automation circuit,we have used a 1 ohm resistor to the the series of all the three phases of smps ,normally when i measure in multimeter i saw 40mA at the smps input when i measure(voltage) across the 1 ohm resistor i got 0.04v so when i use formula I=V/R,im getting 40mA but i need to interface it with micro controller .

Can anyone please suggest me a AC amplifier circuit ,with isolation .
Please find the image to know my measurement place

 

[ramussons]

A multimeter will give a acceptable reading only if the measurement quantity is a DC or a Pure Sine wave.

You can use a AC / DC Hall Current Sensor Module using ACS712
from eBay or Amazon to interface the microcontroller.

Read about its functioning.