Measuring current with high frequency ripple?

[eem2am]

Hello,

I wish to measure the average value of current waveforms which look like this.....

http://i45.tinypic.com/1znmx6q.jpg

As you can see, it is ~1.17A average, and has a ripple on it at 33KHz.
(its the voltage across a 0R082 sense resistor)

Can this DVM measure its average value accurately?

Tenma "72-7765" DVM:
http://www.farnell.com/datasheets/1661853.pdf

 

[(*steve*)]

Well, you have the image from your scope, does the multimeter produce an accurate reading?

 

[eem2am]

i see what you mean, but they may be the same and both be wrong.....it amazes me that the datasheet doesnt state the accuracy.

I would have thought X +/-Y% is a good old way for them to state it for each range, but they never do.

 

[(*steve*)]

If you get results that are very similar, then it is likely that both are accurate. It's unusual that two very different devices have the same inaccuracy.

In any case, the waveform looks fairly close to a sin wave. This should allow you to calculate RMS values to provide a third estimate.