Sharing..........

As I age I am so sad witnessing how poor is my eye-sight when it comes to seeing small stuff.

I got my Fluke DMM 179 STILL showing low battery when I just replaced it with a new one.
So I went in deeper and found this : The negative black wire is ruined by corossion of some sort. BUT not the positive.


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Corossion wickingf from 9V battery connector to the mini white pin connector to DMM PCB board.


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The entire length of the black wire copper strand is already this blackened oxidized but it is not fragile or easily broke like when a true corossion is taking place.


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I did not recall this Fluke ever had a leaking 9V battery, because this is my daily DMM.
The low battery warning on this 179 need to be 5.2V to trigger it and this unit consumes only 1.1 milliamp of power when in Voltage Mode.
One can imagine how much a bad contact this "corossion" is doing to the wire, as such even 1 milliamp of load is not possible to be within 9 volt ( 100% brand new battery is 9.6V )


I don't have to test it myself, someone already did , Thank you Mr Pallav




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As to why only the negative post and wire got so corroded on my 9V battery connector, maybe mild gassing off from the 9V alkaline happened over the years.
This 179 of mine is like 10 years old I think.


Imagine this battery 9V connector is our module connector.
Our modules many are using the MLK1.2mm , or 1.2mm wide blade connector. This 9V battery connector is at least 1/2 smaller. Still MLK1.2 is very small. 1.2mm or 0.047 inch wide is VERY SMALL.

So, if you guys are looking at connectors and no more YOUNG 20/20 eyes, get a good magnifying glass.
I did not see the green crusty at the small white terminal, when looking at a glance until I really disconnected it and see it up close with magnifying glass.

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OUR CARS, aside from green crusty :
Oil wicking into wire strand may create high voltage drop too I am sure, as oil is an insulator.
If the oil is used oil, it may contain metal or chemical which may be conductive, this may cause mild short curcuit.

This is why I hate connector crimped style ( all of them ) and none is soldered.

Below is 15 years at sea ( at the marina ) and some heavy use between 2007 to 2014. On my co-owned boat.
See how the soldered and light crimped connector is doing well.





Anyhow......... that is all I want to share......

 

MS! your eye sight is going blurry but your mind is getting sharper!

 

Do uou know what would be great when you have time ???

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