Monitor Amperage with a Stamp
Aaron Wall
Posts: 31
I want to monitor the amperage flow of a circuit with a basic stamp. As much as several amps, any ideas?
I was thinking of using an amp clamp, those output simple signals that a DVOM can read.
But something less expensive would be nice, I have four circuits to monitor.
I was thinking of using an amp clamp, those output simple signals that a DVOM can read.
But something less expensive would be nice, I have four circuits to monitor.
Comments
How much accuracy do you need?
How much resolution do you need?
How much precision do you need? Note: these three questions are not the same. Accuracy, precision, and resolution are distinct, not the same thing.
What electrical and magnetic noise is likely to be present?
AC or DC? If AC, what frequency? If DC, do you need to measure currents flowing in both directions, or only one?
How much voltage drop can you stand in the sensor?
Do you need to isolate the sensing equipment from the conductor that is carrying the current that you want to measure, or can it be in electrical contact with it??
How often do you need to measure the current?
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· -- Carl, nn5i@arrl.net
I need to monitor DC current into or through·an 800 watt electric motor ruinning between 800 and 2000 rpm.··Amperage values·will vary from minimal load of 7 or 8 amps to peaks of 40 amps· I would like·resolution to be in .25 amp increments if possible.·· And Accuracy needs to be in 10ths.·· It is 48 volt system.· The motor and the sensors along with a BS2p40 are on the same DC supply.· I will be filtering the logic / sensing power so noise in the circuit will be minimal.·· EM will be a little high due to proximity to the Motor.·
I cant sheild the motor due to heating issues.·
Im a total noob on this stuff Carl so any advice you can give would be much appreciated.·· My goal with the current sensor is to convert it to an lcd display and transmit the data via rs232 for analyis in excell.
thanks
BTW· Im diggin through this web site to learn about this stuff
http://scienceshareware.com/how-to-measure-AC-DC-current-with-a-hall-effect-clamp-.htm
The company is GMW and associates
Here is the web site.· http://www.gmw.com/magnetic_sensors/sentron/csa/CSA-1_Acc.html· Its an 8 pin IC.·· Check out the data sheet on the CSA-1V
I like the little "R/D Kits" they have.····A little more expensive but immeidatly installable.
Im going to check and see if Dallas Semiconductor (Now Maxxim IC) has a "One wire" current sensor.
L8r
For my application, I want to monitor a power window motor in a car. The amperage spikes when mechanical resistance is applied to the assembly. This is the same system the auto up features on new cars use to detect when something is in the path of the window on it's way up, such as a hand, knee or tongue. You know, anything you don't want rolled up in a window.
I haven't pulled the door apart yet to get exact specs. I need to buy an amp clamp for my DVOM any way, then I can get my range of normal operation amperage vs spike amperage.
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· -- Carl, nn5i@arrl.net
DJ
http://forums.parallax.com/forums/default.aspx?f=15&m=327234