AC peak current measurement
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Posted by David N. on October 25, 2006, 9:29 am
Please log in for more thread options I am using a Valhalla Scientific digital power analyzer to measure power current and voltage. Unfortunately, the instruction manual for this unit has been lost, so I need some help understanding what this thing is measuring. The unit displays true power, amps in true rms and volts in true rms. 1.) What is meant by "true power"? How are the calculating this? 2.) I know that the current is not sinusoidal. Is there a way to calculate the peak current using this meter? Thanks, David -- | |||||||||||||||||||
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Posted by Eeyore on October 25, 2006, 9:42 am
Please log in for more thread options "David N." wrote: http://en.wikipedia.org/wiki/Apparent_power | |||||||||||||||||||
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Posted by MooseFET on October 25, 2006, 9:48 am
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David N. wrote: > I am using a Valhalla Scientific digital power analyzer to measure
> power current and voltage. Unfortunately, the instruction manual for > this unit has been lost, so I need some help understanding what this > thing is measuring. > > The unit displays true power, amps in true rms and volts in true rms. > > 1.) What is meant by "true power"? How are the calculating this? True power means the average value of the instantanious power. At each instant, you multiply the voltage by the current and then you average the results. Very often some of the values you are averaging are minus because energy is actually being returned to the mains at that time. If you merely multiply the RMS current by the RMS voltage, you get a number that is often higher than the true power. > 2.) I know that the current is not sinusoidal. Is there a way to
> calculate the peak current using this meter? > > Thanks, > David >
> -- | |||||||||||||||||||
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Posted by on October 25, 2006, 9:48 am
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David N. wrote: > I am using a Valhalla Scientific digital power analyzer to measure
> power current and voltage. Unfortunately, the instruction manual for > this unit has been lost, so I need some help understanding what this > thing is measuring. > > The unit displays true power, amps in true rms and volts in true rms. > > 1.) What is meant by "true power"? How are the calculating this? > 2.) I know that the current is not sinusoidal. Is there a way to > calculate the peak current using this meter? > > Thanks, > David > Some references on true power, etc.: http://groups.google.com/groups/search?hl=en&q=true+apparent+power http://www.allaboutcircuits.com/vol_2/chpt_11/2.html http://www.google.com/search?hl=en&lr=&q=true+apparent+power+ I think Valhallas do typically measure peak inrush current, for instance. I would get the model number and use Google to see if you can find the manual. You can also check the Valhalla website to see what you can find or you could just call the company. I remember talking to some people there years and years ago and they were helpful. http://www.valhallascientific.com/calibrators/cal-2701c.shtml | |||||||||||||||||||
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Posted by David N. on October 25, 2006, 11:19 am
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In general, is there a way to find the peak current, given Vrms, Irms and P (true power) when the V and I waveforms look as follows? . . . . . . . . V . . . . . . . . . . . . . . . . . I ... ... .... . . . . . . . . . If the meter reads true rms for Irms, then I can't simply use Im = Irms/0.707. Is it possible to get Im from these known values? Thanks, David David N. wrote: > I am using a Valhalla Scientific digital power analyzer to measure
> power current and voltage. Unfortunately, the instruction manual for > this unit has been lost, so I need some help understanding what this > thing is measuring. > > The unit displays true power, amps in true rms and volts in true rms. > > 1.) What is meant by "true power"? How are the calculating this? > 2.) I know that the current is not sinusoidal. Is there a way to > calculate the peak current using this meter? > > Thanks, > David -- | |||||||||||||||||||
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> power current and voltage. Unfortunately, the instruction manual for
> this unit has been lost, so I need some help understanding what this
> thing is measuring.
>
> The unit displays true power, amps in true rms and volts in true rms.
>
> 1.) What is meant by "true power"? How are the calculating this?