My Multimeter reading wrong Amp

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My Multimeter reading wrong Amp

Postby artooks » Wed Nov 08, 2017 12:07 pm

Hi,

Just purchased this drok led 4 in 1 multimeter, I am using it with Auber DSPR 1 Voltage Regulator, and quite happy with it, the only drawback is it shows the wrong Amp or Watt, the watt looks ok because this regulator is linear I tried it with a small kettle first to see in how many minutes it will boil the water for example it boiled 1 lt of water in 4 minutes at 100% power and when I did boil the same amount of 1 lt water at 50% it did it in 8 minutes so I can say that it is linear, and the watt is also cut by half but please look at the pic the amp is showing 5.08

Volt: 223.8
kW: 780

So Watt / Volt : Amp

780 / 223.80 = 3.48 amp but it displays 5.08 I do not know why it does that I use the DSPR 1 in burst firing mode anyone faced a similar problem ?
how can I correct it ?
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Re: My Multimeter reading wrong Amp

Postby artooks » Wed Nov 08, 2017 12:10 pm

And at 100% power everything is correct please see.
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Re: My Multimeter reading wrong Amp

Postby RedwoodHillBilly » Wed Nov 08, 2017 1:13 pm

The error reading the power is because of burst firing mode. The meter has an averaging time that is less than the burst period. I'll bet if you watch the meter, you'll see the power output varying over time. Bottom line, don't worry about it. The power output would be correct of you were using a simple phase angle controller (think light dimmer). The burst mode is more efficient and will create less noise on the AC line, therefore it is a better control algorithm, but your meter isn't designed to read it correctly.

If it were me, I'd just remember where you set the controller for the product output that you want as an initial setting, and then adjust the power level of the still by look and feel.
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"and little Sir John in the nut brown bowl proved the strongest man at last.
The huntsman he can't hunt the fox, nor so loudly to blow his horn
and the tinker he can't mend kettle nor pots without a little barleycorn."
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Re: My Multimeter reading wrong Amp

Postby artooks » Wed Nov 08, 2017 1:27 pm

Thanks, I know where I set it last time dropped it to 16% and finished with 28% my element is 4500watt that part is ok but just wanted to see if I could do something about it there are true rms multimeters but I guess they would behave the same
Thanks Redwoodhillybilly
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Re: My Multimeter reading wrong Amp

Postby RedwoodHillBilly » Wed Nov 08, 2017 1:29 pm

Yup, a true rms meter would have the same problem.

You're welcome :)
John Barleycorn must die.
"and little Sir John in the nut brown bowl proved the strongest man at last.
The huntsman he can't hunt the fox, nor so loudly to blow his horn
and the tinker he can't mend kettle nor pots without a little barleycorn."
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Re: My Multimeter reading wrong Amp

Postby nuntius01 » Wed Nov 08, 2017 3:54 pm

and this is why we have this site. the amount of knowledge here really is top notch
I'm just the bank and the mule

post your still pics here
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Re: My Multimeter reading wrong Amp

Postby RedwoodHillBilly » Wed Nov 08, 2017 8:16 pm

Aw shucks, twarn't nuttin.
John Barleycorn must die.
"and little Sir John in the nut brown bowl proved the strongest man at last.
The huntsman he can't hunt the fox, nor so loudly to blow his horn
and the tinker he can't mend kettle nor pots without a little barleycorn."
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