I need a testing box built!

Here's what I need, a simple small box with two 510 connectors, male/female and two led or lcd readouts to accomplish two things. I want to test cartos/attys/batts to find current draw and voltage under load. Pretty simple, right? Madvapes sells the LCD readout voltmeter but it doesn't work on a single eGo type unit I have here, it just blinks so there needs to be a way to accommodate those types of batteries. It needs to handle 3-8volts and up to 5 amps.
So that's it; can be a single multi-line display even, I just want AMPS and VOLTS displayed. Battery on one end, 510 carto on the other.

Anyone up for it? We can discuss it here, but I'd prefer PM's if you are interested in building for me.

Thanks.

 

Prob is that mv's meter won't work on all mods. Believe this may be your problem .....

 

There are other devices that can be made to test what You want. I can draw up some diagrams and post them here. Your best meter will be a multi-meter.

If you can or get some one to wire it I can draw it up for you.

 

Ok here it is, rough paint job but should be straight forward and easy to understand.



The blue pieces symbolize the alligator clips I would use.

 

I believe this is right but it has been a while since I have set up an inline testing block.



Someone double check me but I think this is right and it has been a long day.

Color scheme I used is
Red +
Black -
Green upstream Amp port
Yellow downstream Amp port

Even if you are no good at soldering this can be done by someone who is and the middle line connections can be done on a screw terminal block inside the box.

 

I would also recommend that you use stranded wire for more flexibility or make "stab" ports for the multi-meter probes to be stabbed into for the tests. This will minimize the chances of the wires getting broken due to constant flexing of the wires.


I believe this will meet or exceed all you intend to do and if you set it up with a 510 native connector you can always use an adapter to get 901/801/808/301/401/ etc etc.

Alos remember that you need to cross the muti-meter probes before and after your reading to see how much resistance is in the leads of the multi meter, you simply subtract that from you total. For exaple. You cross test leads and get a 0.2 during the resistance test you get a 3.2 and after it is .2 again then you can safely say that the resistance of the atty is 3.0 Ohms.

Resistance would be measured just like Voltage but with the multi-meter in the lowest setting for resistance namely the one with the beeper on it.

 

alan you should just mod a multi meter into a Box PV
I have a spare HHM12 thats looking to be modded into this Hint
http://www.omega.com/pptst/HHM10_20_30.html

 

Now those are both great ideas! I like and want both! I can do this work, have all the necessary tools, just need parts now. Thanks Papa, your little box would be very handy and quite workable. Capevette, I like this VOM mod idea alot too. My only real problem at this point is time. I am moving this weekend and you all know what that entails for several days before and after. I'm going to be consumed with all that and trying to get orders out the door too. Who wants to build one for me? Trade for something? I have stuff if you have time...
Thanks!

 

Hey Papa, in this diagram, yellow and green wires would require a shunt of some sort wouldn't it? Unless the meter was capable of that kind of current?