multimeter advice needed
Wen Yen Chan
chanwe at ecf.utoronto.ca
Thu Feb 18 13:11:41 GMT 1999
Hello,
Why not pull a ELD (electronic load detector) from a 86-89 Acura Integra
or any Acura Vigor. The sensor is used to measure the DC electrical load
and allow the computer to adjust the idle speed and alternator output as
required. I think the output is normalized to a 5volt scale. If anyone is
interested I'll probe the sensor's output.
Wen
On Wed, 17 Feb 1999, Raymond C Drouillard wrote:
>
> On Wed, 17 Feb 1999 13:58:39 -0800 Don Holtz <daholtz at axionet.com>
> writes:
> >Here is an idea:
> >
> >Try using a current sensing resistor. They are usuaully 1mhom (1E-3
> ohm),
> >and a regular voltmeter. Put the resistor in series with the load, and
> >measure the voltage across it. For a 1m ohm resistor, 100A would read
> as
> >100A*.001 ohm=.1V for 1A => 1A*.001ohm = 1mV. These values are
> readable
> >by any resonable DMM, and the current sense resistors should be
> available
> >at any industrial electronic supply shop (ie. Electrosonic in Canada).
> >
> >Note: I^2R=(100A)^2*(.001ohm)10W, so use at least a 10W resistor!
>
> A few years ago, I read a construction article for a high-current
> ammeter. It was a couple of jumper cable type clamps with a short piece
> of copper wire of a known resistance between them. Small sockets were
> provided for voltmeter probes (see above).
>
> >
> >
> >I seem to remember that inductive current meters only work on AC, not
> >DC!
>
> I have never seen a DC current meter that reads magnetically. It could
> be done with a hall effect sensor, though. It would be an interesting
> construction project. If you calibrate it to read in the 100A range, you
> could read in the 10A range by wrapping the wire through the loop ten
> times.
>
> >
> >Cheers,
> >Don Holtz
>
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