Dear All,
I have measured Solar inverter output current (AC). I want to separate the DC component therein. Does anybody has idea how can I measure DC component from captured AC output current in Digital Storage Oscilloscope/Power Analyser??
Dear Aalok,
the DC-content of an alternating current is given by its arithmetic average.
Do the math :-)
iDC=1/T integral I(t) dt.
For a purely sinusoidal current, the value returned is zero.
In case your scope/power analyzer can do the math for you, the task can easily be solved using the Math-Setup of the equipment.
Cheers - Martin
Hi Aalok,
Check if your power analyser has online Fourier Analysis capability. Many of them do, and it should solve your problem right away by providing all components (including DC) in real time.
With best wishes.
-Sanjay
Oscilloscopes provided by Agilent Technologies have the option for Fourier analysis. I used this feature often and it should solve your problem very easily.
If you have none of the above, and you want to measure in future, Measure with BW filter ON, then take the difference between the AC and DC coupled peak reading.
channel 1 is set to AC coupling and channel 2 is set to DC coupling , the signal is measured by Ch1 and Ch2 , by math function "sub"in oscilloscope to obtain the difference value between Ch1 and Ch2
Be careful with the offsets of current probe and oscilloscope.
One simple method is to make sure that the measured DC value is zero when the current is zero.
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