Re: power consumption
From: Mac (foo_at_bar.net)
Date: 12/14/04
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Date: Tue, 14 Dec 2004 06:14:52 GMT
On Mon, 13 Dec 2004 20:31:42 -0800, pmm wrote:
> Hello everyone,
> I am fresher engineer workingon the electronics design .
> I have designed a circuit board with a Micro controller, SRAM, a
> MotorDriver on it, and along with somehundreds of discretes ,now i am
> unable to measure the total power consumption ,any one plz give me the
> idea to mesure it as i need to place a on board power supply .Till now
> i have used a Regulated power supply of the lab,and it is not having
> a provision of displaying current consumption.
> Plz help me with the process to measure the power consumption
> thanks and regards
> pmm
Well, you seem to understand that all you need to do is measure the
current.
An instrument for measuring electrical current is called an ammeter. Most
hand-held and bench meters measure Volts, Amps, and a variety of other
things. To operate in ammeter mode, you usually have to rearrange the
leads on the meter, and select "DC amps" or something similar.
So, you power up the board from your bench supply, with the ammeter in
series with the board. First, adjust the bench supply so that the voltage
ON THE BOARD is correct. The Voltage at the power supply may be a bit
higher than usual, now, because the ammeter has to have a Voltage drop to
work. (This means you will need two meters. I hope you have two!)
So once you have the voltage at the right level on the board, record the
amps going into it, and you have everything you need. (P = VI, but I think
you know that ;-)
HTH.
--Mac
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