Thanks, John. I have timer for control pack charging, so that is a problem.
By the way, I think I should charge no later than 6 hours for 175MhA, don't I?
--
Michael
Palm, Linux, Olympus, Mac user
2006/12/22, John Hermanson <omtech1@xxxxxxxxxxx>:
>
> I suggest testing each individual cell for volts before soldering.
> After I've soldered 6 cells together for one side of the cluster, I
> measure again with the voltmeter. Results should be around 7V or so.
> I may get my test NiMH cluster done this week. BTW, NiMH batteries can
> be damaged if left charging too long with a charger intended for nicads.
> Unfortunately, you cannot leave them charging overnight as you could
> with the nicad cells. Charger should be put on a timer.
>
> ___________________________________
> John Hermanson
> Camtech Photo Services, Inc.
>
>
> Jeff Keller wrote:
> > Just measuring the voltage will probably tell you if the connections
> > are good.
> >
> > If you try to measure ohms or "continuity" across a voltage source
> > such as a battery, the voltage source will force current, quite
> > likely too much current, to flow through your meter. I noticed in one
> > of your pictures your meter was set to a 1 ohm range. Perhaps you
> > only measured the voltage and not the "ohms".
> >
> > If you want to test how good your connections are you could try to
> > find a resistor to use as a load. In this case you have 175mah
> > batteries with about 15v. So you would want a resistance of about 15v
> > / 0.175a = 86 ohms (or maybe less) but it must handle nearly 3
> > watts. The motor drive probably takes a higher short burst current
> > than this, but as a very "approximate" test, just discharging the
> > battery at a current rating equal to its amp hour number would show a
> > voltage drop if the connections weren't good enough. In this case
> > just operating the motor drive would be a better test.
> >
> > If all you did was measure voltage, your meter is as good as anything
> > you could use.
> >
> > -jeff
> >
> >
> > On 12/21/06, Michael Wong <mialop@xxxxxxxxxxxx> wrote:
> >
> >> Thanks, Jeff. What equipment should I use to measure?
> >>
> >> -- Michael
> >>
> >> Palm, Linux, Olympus, Mac user
> >>
> >>
> >> 2006/12/21, Jeff Keller <jeffreyrkeller@xxxxxxxxx>:
> >>
> >>> That looks like a nice "do it yourself" job. Thanks for posting
> >>> all of the pictures.
> >>>
>
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|