power consumption

P

pmm

Guest
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
 
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
Click to expand...
I'm puzzeled, how can you design complicated PCBs and be an engineer without
knowing how to measure supply current?

--
ciao Ban
Bordighera, Italy
 
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 .
Click to expand...
The power supply capacity should be computed worst case and not
measured. Take your question to the basic newsgroup.
 
On Tue, 14 Dec 2004 06:14:52 GMT, Mac <foo@bar.net> wrote:

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 ;-)
Click to expand...
And don't forget to re-rearrange the meter leads immediately after the
current reading is completed!!
--

"What is now proved was once only imagin'd." - William Blake, 1793.
 
ubject: Re: power consumption
From: "Ban" bansuri@web.de
Date: 12/14/2004 12:33 AM Central Standard Time
Message-id: <ePvvd.290535$b5.14171698@news3.tin.it

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

I'm puzzeled, how can you design complicated PCBs and be an engineer without
knowing how to measure supply current?
Click to expand...
Because he's a "fresher" engineer. I believe it's a colloquialism meaning
straight out of school, and I'm assuming it's not in the Heinlein sense
(although the question does get you wondering).

I would suppose he's good with pspice, though.

Chris
 
On 14 Dec 2004 14:52:20 GMT, cfoley1064@aol.com (CFoley1064) wrote:

[snip]
I would suppose he's good with pspice, though.

Chris
Click to expand...
That was an underhanded slur. Particularly since it is my observation
that it takes hands-on experience before you can really understand how
to use simulators.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
I read in sci.electronics.design that Jim Thompson
<thegreatone@example.com> wrote (in <d00ur014s9ss86fvoa9eeu7p60nc3i2ppp@
4ax.com>) about 'power consumption', on Tue, 14 Dec 2004:

Particularly since it is my observation
that it takes hands-on experience before you can really understand how
to use simulators.
Click to expand...
To use pspice you need PerSPICacity.

Furthermore, DVD is going to be replaced by EWE, because it's inherently
sheeper.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Tue, 14 Dec 2004 15:51:52 +0000, John Woodgate wrote:

I read in sci.electronics.design that Jim Thompson
thegreatone@example.com> wrote (in <d00ur014s9ss86fvoa9eeu7p60nc3i2ppp@
4ax.com>) about 'power consumption', on Tue, 14 Dec 2004:

Particularly since it is my observation
that it takes hands-on experience before you can really understand how
to use simulators.

To use pspice you need PerSPICacity.

Furthermore, DVD is going to be replaced by EWE, because it's inherently
sheeper.
Click to expand...
Until you run out of RAM.
 
Subject: Re: power consumption
From: Jim Thompson thegreatone@example.com
Date: 12/14/2004 9:05 AM Central Standard Time
Message-id: <d00ur014s9ss86fvoa9eeu7p60nc3i2ppp@4ax.com

On 14 Dec 2004 14:52:20 GMT, cfoley1064@aol.com (CFoley1064) wrote:

[snip]

I would suppose he's good with pspice, though.

Chris

That was an underhanded slur. Particularly since it is my observation
that it takes hands-on experience before you can really understand how
to use simulators.

...Jim Thompson
Click to expand...
Sorry, no offense meant.

I should have left the <irony> switch visible. I thought the prior backhanded
reference to Heinlein's "freshers" gave an indirect indication of that.

http://technovelgy.com/ct/content.asp?Bnum=382

You're exactly right, of course.

Chris
 
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