Subject: Re: Reducing contact resistance for low volt use?
Summary: What do you think of these ping times eh?
Reply-To: You can't see me, and I pass right through planets...
References: <email@example.com> <firstname.lastname@example.org> <email@example.com>
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Date: Mon, 06 Jan 2003 13:06:51 GMT
NNTP-Posting-Date: Mon, 06 Jan 2003 08:06:51 EST
On Mon, 06 Jan 2003 06:20:59 GMT, jmuchow@SPAMMENOTcamlight.com (John
Muchow) Gave us:
>What the heck is that test supposed to do for me? 12A? You're right,
>this test is simple. The problem is that it offers nothing to me. No
>valid data, nothing.
What do you think the shunt resistor in your ammeter has a value of?
What I offered you is the proper way of measuring current. A low
value, high wattage precision resistor in series with the load line
can be read directly with a voltmeter for current usage. It is likely
less resistance than the shunt in your el cheapo meter. The voltage
section of that same meter is probably pretty accurate. If the
resistor is accurate and the meter is accurate, your readings will
reflect real numbers. The ammeter sections of many DVMs are not all
that great on accuracy, especially at such high amperages. Not to
mention the heat that gets generated in the case.
So, it offers MORE valid data, not less. For a longer period.
That is called repeatability.
By what method do you currently determine the current level in the
An inductive current probe is best, but is probably outside your
budget for a decent one. I don't know what you are wanting to spend
on this thing.
One more thing. If the "wires" that lead to your motor controller
are smaller than those in you tester, what "valid data" do you get
from your test?