#20 H2O2 - Current HE V1.0.1 - A budget Alternitive to a $70 or more Clamp on Current Meter Part 1

[muhdsyafiq88]

Nice one..interested to make one...

where can i get the circuit for it??

[eloid777]

where can i get the schematics for it?

[ZeroFossilFuel]

Okay, ~$30 for a current sensor that still needs an op amp with adjustable gain and power supply.

PMS about $1.00 in hardware. Very linear.

How linear is the HE?

[H2O2FromH20]

The Linearity of the L08P100D15 from Mouser is less then or equal to +-1% at 100 Amps.

I am personally experiencing a shift in current as the temperature of my PMS increases from Self heating. It happens between 20 and 30 amps. I can feel the shunt heat up. I will preform further test.

[ZeroFossilFuel]

You're right. Copper does have a positive resistance temperature coefficient. It's still going to be within 5% tolerance once calibrated cold, certainly good enough for quick and dirty high amperage measurements.

[H2O2FromH20]

I totally agree, It would be a great feature, I have plans to add the Amplifier and I am relaying out the board Shortly to accommodate the Lower voltage regulator. The only problem with the Scale amplifier is that a Scale of 0 to 1 volt out has a poor resolution .1 amp steps, the other option is 0 to 10 volt scale but the operator will have to move the decimal over 1 place 20 amps would read 2.000 volts and the resolution is excellent. What option is better?

[davidrrrd]

prity good, now it should hook up to a bord with the power factor calibration done on the bord so the amps read on a digitil display correctly for the "layman"