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From: jmuchow@SPAMMENOTcamlight.com (John Muchow)
Subject: Re: Reducing contact resistance for low volt use?
Date: Tue, 07 Jan 2003 02:57:28 GMT
Organization: MindSpring Enterprises
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
X-Server-Date: 7 Jan 2003 02:59:19 GMT
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OMG, all these separate posts are killing me!!!
>>> 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.
That's the way we're plotting our data...but with a 24-bit (0-2.5V)
data logger....mentioned in one of my previous posts.
>>>It is likely
>>>less resistance than the shunt in your el cheapo meter.
My what? LOL!
>>> So, it offers MORE valid data, not less. For a longer period.
>>>That is called repeatability.
Who the heck said we were measuring the current with a DVM? Please,
please, PLEASE READ EVERY POST IN THIS THREAD!!
>>> 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?
We get data that says for wire gauges that contribute a certain known
voltage drop at various current levels, here are the current-vs.-time
discharge curves for various cells....EXACTLY the info we're looking
for. This is valid data!
The data we gather will allow the users to select the cell they want
to use, knowing the cost, availability, and performance under typical
(for combat robot and R/C users) load. The tests will all be run
under almost indentical conditions for each cell...critical for
achieving "valid data". Since we can't simulate the load and wire
resistances encountered in every robot and R/C machine out there, we
can only do what everyone else does....test with a known set of
Each R/C place and car builder/drive and combat robot builder will
have to take the gauge of the wires they are using into account...just
like ANY user of ANY battery. The manufacturer will test their cells
under certain conditions (hopefully described thoroughly in the data
sheets) and can only state that the data is good for these conditions.
We will be doing nothing other than this.
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