AC ammeter

[Dr_Doggy]

I am about to build an ac ammeter, i was reading that the best way to do this is to use a Rogowski coil and feed it in to a in integrator, and from there to my PICuC, (the value out from the integrator is dcv right)?

would this work?

btw, the word integrator sounds like it can add 2 signals, is that possible(AC i presume)?

 

[ronv]

In this case the term integrator means low pass filter. The output will still be ac.

http://www.dynamp.com/dynamp/ldadocum.nsf/c2270fbdd892ac3e86256e75000ad88a/e710af6d3e0f6255862565d7004b19db/$FILE/Report.pdf

 

[Dr_Doggy]

so I would rectify it, then to the pic?

is there a better circuit I should use>?

 

[ronv]

How much current? What frequency?

 

[Boncuk]

Hi doggy,

check out Allegro-micro for current sensors.

There are bipolar sensors in the assortment which can measure AC and put out DC-voltage depending on the current range to measure.

Boncuk

 

[Dr_Doggy]

120v mains... up to 20amp should suffice,, although i want to measure phantom power from electronics as well, im thinking mostly about reading a typical power bar.

 

[Boncuk]

Hi doggy,

if the prophet won't come to the mountain the mountain will come to the prophet.

Here is the data sheet of the Allegro-micro ACS758. It has an internal resistance of 100µΩ and the bidirectional version measures ±50A with an almost linear output voltage of 40mV/A.

That should be easy to use.

Boncuk

 

[Dr_Doggy]

TY very much, Boncuk, I tried to climb that mountain, but I found it hard to read the data sheets, I looked up that part number @digikey and they have it, could you just confirm that I have selected the right one, since that number I punched in got me several results:

Digi-Key - 620-1322-ND (Manufacturer - ACS758KCB-150B-PFF-T)

and this puts out a DC voltage, relative to the ac current in?, this chip looks like it supports 240v too(not req'd thou)?