measure power for battery calculation

[A 2]

I have a battery operated circuit. 

1. Circuit wake up for 100ms. Do its work & go to sleep for next 1sec.

2. In 100ms, it does many different task. one after another.
So current keeps on varying in that 100ms also.


I have to measure power of circuit so that I can calculate the battery requirement.

1. I tried to put simple ammeter in between but it couldn’t measure high frequency spikes.

2. Then I put a 5 ohm resistor in power path, & check the voltage across it with oscilloscope. It shows repetitive readings in the circuit.

At any instant I can get current by dividing the voltage noted from CRO by 5ohm.


By how to consolidate the total power across one cycle.


3. Is there any low cost solution available which can measure the power drawn.

[AJISH ALFRED]

Calculate the equivalent continuous current. It is nothing but the sum of the current consumption for each task averaged out over 100ms time period.

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