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Power measurement issues.

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Steve:
Hi members,


I have a case here. Please try to help me out here.
The story is as follows.
I got an energymeter from Cresta which was tested a Best Buy in a consumertest. This meter was most correct in his measurements.

I put the meter between the 230V wandoutlet and my lab variable powersupply. On this PS are an ampmeter and a voltmeter.

After doing tests with Strait dc and also with a setup with 50% pulses and new coils it was very difficult to say what the powerconsumtion was in these tests.

What i did was keeping the watts on the energymeter on 60watts.
The reading from my PS display where between the 2.5v till 9v and most of the time on 2A.

Question: is the energy meter right because it includes the whole powersupply or should i use the PS readings?

My first impression is to choose for the energy meter.
If thats the right way of measuring then i have good news for you  :D
Strait dc vs 50% duty vs 50% with diodes and coils.....
All tests did 60watts on the energy meter.
The coils setup was a winner....

Steve





Steve:
Helloooooo....

Do we measure powerconsumption before the powersupply or after?


Thank you.

electrojolt:
Hey Stevie... I would measure before the power supply.

how about using a small fully charged battery... testing how long it will take to drop to a predetermined voltage. like 10 volts.

Steve:

--- Quote from: electrojolt on April 04, 2010, 16:32:29 pm ---Hey Stevie... I would measure before the power supply.

how about using a small fully charged battery... testing how long it will take to drop to a predetermined voltage. like 10 volts.

--- End quote ---

Hi Jolt,

Well, i thought the same. Can you do me a favour and run a test on your PS?
Just measure amps and volts on the 110V, and monitor that when you add some load to the ps. It totally doesnt match here.
The PS pulls like 60watts, but on the PS outlet it does like 10watts.
Seems to me like a lot of losses.

Its pretty hard to explain like this. Can we meet on Skype or msn one of coming days?

Steve

haithar:
If it's not a rms meter then you can't believe it to be correct. especially not if your powersource shows more power than your cheap outlet energy meter.

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