Accurate affordable RI meter for low impedance cells?

Batteries, Chargers, and Battery Management Systems.
Degull   100 W

100 W
Posts: 108
Joined: Oct 12 2011 5:54pm
Location: Toronto Canada

Re: Accurate affordable RI meter for low impedance cells?

Post by Degull » Nov 29 2011 3:41pm

For those of us that are electronically and mathematically challenged, some clarification please. I've been quietly reading and fumbling along with this thread. Still not sure how I would set myself up to do this correctly.

What would you use as a load to get a 20-30 amp current draw? Someone mentioned a precision resistor with 00 gauge wire, would this be the load? If so what value precision resistor would you use as load to get 20 or 30 amps?

I would like to play around with this but I'm still muddy with how to set it up. For example, If I had a A123 2.3ah cell, what value precision resistor would you use? What if you had a A123 20ah battery what values would you use?

I have a decent DMM. If that along with a resistor is all I need, then this would be easy to troubleshoot my own batteries.

User avatar
parabellum   10 MW

10 MW
Posts: 2067
Joined: Nov 19 2010 9:55am
Location: Dominican Republic, north.

Re: Accurate affordable RI meter for low impedance cells?

Post by parabellum » Nov 29 2011 7:53pm

This one costs 30U$ and is pretty constant on values, but see no way to check how accurate it is.
http://endless-sphere.com/forums/viewto ... 14&t=34154

Degull   100 W

100 W
Posts: 108
Joined: Oct 12 2011 5:54pm
Location: Toronto Canada

Re: Accurate affordable RI meter for low impedance cells?

Post by Degull » Nov 29 2011 8:39pm

parabellum wrote:This one costs 30U$ and is pretty constant on values, but see no way to check how accurate it is.
http://endless-sphere.com/forums/viewto ... 14&t=34154
That's why I like to the idea of using a resistor and a Multimeter. I don't have to buy another piece of gear and I can rely on the readings I take with my Multimeter.

User avatar
parabellum   10 MW

10 MW
Posts: 2067
Joined: Nov 19 2010 9:55am
Location: Dominican Republic, north.

Re: Accurate affordable RI meter for low impedance cells?

Post by parabellum » Nov 29 2011 10:41pm

Degull wrote:
parabellum wrote:This one costs 30U$ and is pretty constant on values, but see no way to check how accurate it is.
http://endless-sphere.com/forums/viewto ... 14&t=34154
That's why I like to the idea of using a resistor and a Multimeter. I don't have to buy another piece of gear and I can rely on the readings I take with my Multimeter.
I want see how you measure IR under 1kHz frequency with resistor. :)

Edit: It is stated 5% accurate. If it is truth, it is enough for me.

Post Reply