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-   -   Is this multimeter good to check for parasitic draw? (http://forums.pelicanparts.com/off-topic-discussions/1059797-multimeter-good-check-parasitic-draw.html)

G50 05-01-2020 01:50 PM

Is this multimeter good to check for parasitic draw?
 
It can measure AC colts, DC volts and resistance.
Can I use it? If so, what setting should I put it at and what readings should I expect to see?http://forums.pelicanparts.com/uploa...1588369876.jpg

Bob Kontak 05-01-2020 02:03 PM

No. You need one with more functions.

Here is a decent Harbor Freight unit. Not great. Decent. $23

Click on the multimeter in the link and get the larger pic. See the dial at 6:00-7:30 on the clock. That's what you need to test amp draw.

https://www.harborfreight.com/11-function-digital-multimeter-with-audible-continuity-61593.html

Plug the red cord into the "fused" port. Break a battery cable and bridge with the MM cable pointers. That will complete the circuit and tell you how much is being sucked out of the battery. 50 one thousandths of an amp (Ma - milla-amps) or less is what you are looking for when cooties are remedied.

The basic settings settings "sense" (not an electrician) the volts and resistance. The amp draw settings literally make the MM part of the circuit when you move the red probe into the fused plug-in port.

G50 05-01-2020 02:09 PM

Thanks, that’s what I thought, need one that measures amps, right?
http://forums.pelicanparts.com/uploa...1588371195.jpg

Bob Kontak 05-01-2020 02:16 PM

Yes. The big A with the straight line and the little dashes under it to get technical. :)

But you have to move the red probe to the fused port.

Perhaps the 200 m spot on the dial. Others will know better.

dad911 05-01-2020 02:21 PM

Yes, Amps. Most meters have to be in the circuit, in series. That means disconnecting the wire you want to check, so the current flows through the meter. Quite a few people blow them up by using the wrong scale, or trying to measure wrong.

I strongly suggest getting the clamp-on kind. Need to make sure it can read DC current, some are AC only.

This one will measure DC current by just clamping over the wire.

https://www.harborfreight.com/cm610a-600a-t-rms-acdc-clamp-meter-64015.html

Bob Kontak 05-01-2020 02:29 PM

Quote:

Originally Posted by dad911 (Post 10848104)
This one will measure DC current by just clamping over the wire.

Are you *****ting me? Just clamping on the wire? Like the positive battery terminal wire?

Sigh.

fanaudical 05-01-2020 02:51 PM

Yep - Just clamp around one wire and it measures the current flowing through the wire.

One issue with clamp-on meters is they sometimes don't have sufficient range/sensitivity to measure small currents. You can compensate for this by clamping around a wire looped several times (need a long wire) and dividing the total current by the number of passes of wire though the clamp.

dad911 05-01-2020 02:56 PM

Quote:

Originally Posted by Bob Kontak (Post 10848115)
Are you *****ting me? Just clamping on the wire? Like the positive battery terminal wire?

Sigh.

Yup, bought an earlier version of the HF one, years ago.....now the fluke gathers dust.

Need to be careful purchasing, many are AC only.

Bob Kontak 05-01-2020 03:08 PM

Quote:

Originally Posted by dad911 (Post 10848135)
Yup, bought an earlier version of the HF one, years ago.....now the fluke gathers dust.

Need to be careful purchasing, many are AC only.

Thanks. I can focus on that caveat.

How sweet that would be.

Quote:

Originally Posted by fanaudical (Post 10848132)
Yep - Just clamp around one wire and it measures the current flowing through the wire.

One issue with clamp-on meters is they sometimes don't have sufficient range/sensitivity to measure small currents. You can compensate for this by clamping around a wire looped several times (need a long wire) and dividing the total current by the number of passes of wire though the clamp.

You know you are talking to laymen here. So is this scenario e.g., for the fancy radio or security system that may be sucking too much juice?

pwd72s 05-01-2020 03:17 PM

Quote:

Originally Posted by Bob Kontak (Post 10848148)
Thanks. I can focus on that caveat.

How sweet that would be.



You know you are talking to laymen here. So is this scenario e.g., for the fancy radio or security system that may be sucking too much juice?

Here's a video on measuring and finding parasitic draw. Yes, alarm systems and fancy radios do draw juice. So if the car is parked any length of time, say a week or more, I'd suggest investing in a smart charger...one that feeds in at 2 1/2 amps or so and will shut off when battery fully charged.

https://www.youtube.com/watch?feature=fvwrel&NR=1&v=KF1gijj03_0

RWebb 05-01-2020 03:28 PM

Quote:

Originally Posted by Bob Kontak (Post 10848115)
Are you *****ting me? Just clamping on the wire? Like the positive battery terminal wire?

Sigh.

Induction baby!!

Bob Kontak 05-01-2020 03:40 PM

Quote:

Originally Posted by RWebb (Post 10848170)
Induction baby!!

You might as well be saying fission. :D

Watching pwd's vid now.

Edit: Watched that vid last week. He's good.

RWebb 05-01-2020 03:46 PM

is this better?


http://forums.pelicanparts.com/uploa...1588376761.gif

Mike80911 05-01-2020 03:52 PM

If you are checking an older car you can also use a simple test light. Disconnect the battery terminal and connect one end of the test light to the post and the other end to the cable. If the light comes on there is a draw. Just remove fuses until the light goes out and that is the circuit that has the draw on it. HF also has a cheap Multimeter that will work I have had this one for years and it works great got it on sale for like $3
https://www.harborfreight.com/7-function-digital-multimeter-63759.html?_br_psugg_q=multimeter

Bob Kontak 05-01-2020 04:12 PM

Quote:

Originally Posted by RWebb (Post 10848190)

Yes. Thank you for the inverted delta. That always makes things crystal clear.

http://forums.pelicanparts.com/uploa...1588378363.jpg

RWebb 05-01-2020 04:24 PM

you can always put them in integral form, you know...

Bob Kontak 05-01-2020 04:28 PM

Quote:

Originally Posted by RWebb (Post 10848229)
you can always put them in integral form, you know...

You're killin' me, Smalls.

RWebb 05-01-2020 04:34 PM

Ya gotta face reality

Bob Kontak 05-01-2020 04:37 PM

Quote:

Originally Posted by rwebb (Post 10848245)
ya gotta face reality

Agree. :D

RWebb 05-01-2020 05:05 PM

and that puts fields in yer face...


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