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Unread 02-10-2015, 03:55 PM   #11
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Default Re: Charging problem

Some meters have what is called "Low Impedance" mode or LoZ.

A typical digital meter will have >10MΩ input impedance.

The Fluke 1xx series (113, 115, 117, etc) is an example of a meter that will also have a LoZ mode with about 3kΩ input impedance.

Those are great meters to eliminate ghost voltage readings in equipment or wires that are not powered.

It will however create the erroneous readings that you are getting if used against electronic equipment as they draw too much current and affect the circuit being measured.

For example, the charger relay coil has about 2.5kΩ resistance, so the meter will look like the charger relay when you took the measurement on the sense wire and that is why the OBC tried to turn the relay on.

The SCR inside the OBC also has a leakage current when off, my guess is about .004 amps, which would have caused a 12.v reading on a LoZ fluke meter.

So everything is probably working fine, just check the meter you have.
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Unread 02-10-2015, 04:11 PM   #12
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Default Re: Charging problem

Thanks again for all your help. I will check the meter tonight, I know its idiot proof it auto detects AC or DC if there is no voltage it reads ohms. There is no scale just an on off button I think its a fluke but I may be wrong. Will let you know later
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Unread 02-10-2015, 08:20 PM   #13
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Ok so I was wrong my meter is a Ideal. 61-096





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Unread 02-10-2015, 08:40 PM   #14
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Well you learn something everyday. After I made the last post I checked pack voltage and in the top right of the meter screen was LOz. Never noticed it before. Once again Sergio I really appreciate all your time and help.


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Unread 02-10-2015, 08:43 PM   #15
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Default Re: Charging problem

Those meters are sometimes referred to as an "electrician meters", their low impedance avoid ghost voltage readings, but they are not designed to measure voltages in electronic circuits.

The meter manual says the impedance would be around 4kΩ-5KΩ, way too low to read voltages either in the sense wire or the charger current control circuit.

Do You have another meter? even the free Harbor Freight ones would work as they have a high input impedance.
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Unread 02-10-2015, 09:40 PM   #16
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Yes I have another one at work. This is one I had got for some of guys to be able to check fuses and AC voltage on some equipment. I figured it was easier for some of the more challenged employees


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Unread 02-16-2015, 10:00 AM   #17
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Default Re: Charging problem

Just wanted to say thanks again Sergio for all the help. I checked with a different meter and all appears well. Your help has made me feel better about not screwing up a new battery pack.
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