Posted to Technical Theory Forum on 12/5/2012
60 Replies
This post is in reference to a reply I made yesterday here
http://members.iatn.net/forums/read/msg.aspx?f=forum2&m=332053&fv=0&ar=0
05 Dodge Caravan parasitic draw testing. I usually use my
Vantage Pro on graphing multimeter mode to check a draw on a
system, in my experience it paints a much wider picture of
what is actually going on, and otherwise would be missed by
the Fluke 87. Here is how I connected to this vehicle for
testing [Parasitic draw testing]
I had mentioned in the reply it was about a 50% duty cycle,
that is incorrect, it was late and I wasn't looking at the
data at the time. I tried to get a reading on the duty cycle
but couldn't figure it out, anyone know how to do this in
amp mode on the vantage pro? I could figure it out math
wise, just busy at the moment, and it is irrelevant at this
point anyhow.
I checked draw with the Vantage pro in graphing mode
[2005 Dodge Grand Caravan, BATT/Charging/Starting
Waveform] see how it says 17mA, but then shows a rapid on
off of amperage, on the upper left you can see it maxes out
at 110 mA, this will drain a battery in just a few days.
Here it is again with scope mode, [2005 Dodge Grand
Caravan, BATT/Charging/Starting Waveform] . Here it is
again with multimeter mode, [2005 Dodge Grand Caravan,
BATT/Charging/Starting Photo] still shows 17mA with a peak
of 110mA.
Here it is now with the Fluke 87 [2005 Dodge Grand
Caravan, BATT/Charging/Starting Photo] shows 9.73 mA and I
put it on min max, no real change, never went over 11mA.
I assume every tech on iATN would pass a 11mA reading I know
I would. But without using a graphing multimeter you are
only seeing a part of the story and not the part you need to
see.
Jeremy from Kansas
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