The Autonerdz Community Forums - Amp clamp for battery drain?

JohnN

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Re: Amp clamp for battery drain?
Reply #30 - Jan 27^th, 2017 at 6:17am

Logic wrote on Jan 26^th, 2017 at 11:40am:

Every time I reach for fluke to use the current shunt in it the fuse is blown, probably from someone in the workshop using my multimeter for a voltage measurement with the leads in the current measurement jacks....blowing the expensive fuse that requires unscrewing the back of the multimeter to replace..

Sharing is caring Angry

My fluke got used last week and came back with 4 leads tied to it in knots from hell. I was so puzzled Cheesy

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Mick

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Re: Amp clamp for battery drain?
Reply #31 - Jan 27^th, 2017 at 11:20am

Logic wrote on Jan 26^th, 2017 at 10:47pm:

What I have given you is simply a plot of voltage verses time.

Ok I do see this Wink

Logic wrote on Jan 26^th, 2017 at 10:47pm:

We are connected to the positive and negative sides of the battery.

Thank you for verifying this

Logic wrote on Jan 26^th, 2017 at 10:47pm:

The car has been driven and to the left of Sunday 0:00 when the engine is turned off the gradient of the battery voltage reduction is significant

How come the battery voltage when not reducing settles back at 14.05V?

Also for 5 hours before the Sunday 0.00 it pull as low as 7.5 Volts yet rebounded to 13.8 Volts ??????

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Question_of_battery_voltage_at_rest_seems_high.jpg (362 KB | 381 )

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Logic LSD Guide Picogroup Offline Posts: 4,143 Bentleigh Victoria Australia	Re: Amp clamp for battery drain? Reply #32 - Jan 27^th, 2017 at 2:18pm Mick wrote on Jan 27^th, 2017 at 11:20am: How come the battery voltage when not reducing settles back at 14.05V? That is when the car is being driven.
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Logic LSD Guide Picogroup Offline Posts: 4,143 Bentleigh Victoria Australia	Re: Amp clamp for battery drain? Reply #33 - Jan 27^th, 2017 at 2:20pm Mick wrote on Jan 27^th, 2017 at 11:20am: Also for 5 hours before the Sunday 0.00 it pull as low as 7.5 Volts yet rebounded to 13.8 Volts ?????? Yes the battery went flat then the battery of the car was jump started with jumper leads and a spare barttery which was carried in the boot of the car for that purpose.
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Logic

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Re: Amp clamp for battery drain?
Reply #34 - Jan 27^th, 2017 at 2:31pm

From work we have done since it would appear that a control unit will periodically fail to go to sleep.

When it does so it will cause a battery drain when the car is switched off.

When the voltage is zero the control unit will reset.

In the event that the battery goes flat the control unit resets and when the vehicle is next turned off that control unit will go to sleep.

Over time at some point the control unit will fail to sleep again and this fault will remain until the control unit again fails to sleep.

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« Last Edit: Jan 27^th, 2017 at 5:36pm by Logic »

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Spence LSD Guide Picogroup Offline Posts: 8,018 Jeffersonville Pennsylvania USA Gender:	Re: Amp clamp for battery drain? Reply #35 - Jan 27^th, 2017 at 3:24pm rayray wrote on Jan 20^th, 2017 at 6:04am: Logic, good point and press the zero button when not connected to a wire. Ray As well as in the area of where you are measuring.
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Spence LSD Guide Picogroup Offline Posts: 8,018 Jeffersonville Pennsylvania USA Gender:	Re: Amp clamp for battery drain? Reply #36 - Jan 27^th, 2017 at 7:24pm Hi Ian, do you have any captures where you used the shunt?
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autosparky

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Re: Amp clamp for battery drain?
Reply #37 - Jan 27^th, 2017 at 8:33pm

Sorry Logic this is really illogical to me, don't want to sound offensive but you may have to explain a bit more detail about this software and it's use, haven't you just proven the obvious? the battery goes flat from a current drain? when it happens is irrelevant but are you using this tool to find which circuit is corrupt is what everyone is interested in.

I brought this tool for measuring long term voltage and current but I've never had to use it for overnight graphing
https://moosh.im/mooshimeter/

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Logic

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Re: Amp clamp for battery drain?
Reply #38 - Jan 28^th, 2017 at 12:14am

JohnN wrote on Jan 27^th, 2017 at 6:17am:

Logic wrote on Jan 26^th, 2017 at 11:40am:

Every time I reach for fluke to use the current shunt in it the fuse is blown, probably from someone in the workshop using my multimeter for a voltage measurement with the leads in the current measurement jacks....blowing the expensive fuse that requires unscrewing the back of the multimeter to replace..

Sharing is caring Angry

My fluke got used last week and came back with 4 leads tied to it in knots from hell. I was so puzzled Cheesy

Every couple of days I put good quality multimeter leads on my Fluke, leads with banana plugs so that I can use both the Pico and other compatable attachments.

Every single frigging time I come back and there are cheap banana leads in the meter with back probe banana pin connectors.

F*&^ing F#@*&ing F(*&^ing H**ll

So yesterday one of my fellows is trying to check the grounds on A E60 V10 M5 with the leads this way and without zeroing the leads...not a F*^^&*ing clue !!!!

So off I go and open up yet another new set of leads...tutor them fo the 150000th time on how to do a proper measurement......

Sometimes it is just impossible

When I try to find out who is doing this they say it was some Asian fellow...called....

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Logic

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Re: Amp clamp for battery drain?
Reply #39 - Jan 28^th, 2017 at 12:44am

autosparky wrote on Jan 27^th, 2017 at 8:33pm:

Sorry Logic this is really illogical to me, don't want to sound offensive but you may have to explain a bit more detail about this software and it's use, haven't you just proven the obvious? the battery goes flat from a current drain? when it happens is irrelevant but are you using this tool to find which circuit is corrupt is what everyone is interested in.

I brought this tool for measuring long term voltage and current but I've never had to use it for overnight graphing
https://moosh.im/mooshimeter/

autosparky wrote on Jan 27^th, 2017 at 8:33pm:

Sorry Logic this is really illogical to me, don't want to sound offensive but you may have to explain a bit more detail about this software and it's use, haven't you just proven the obvious? the battery goes flat from a current drain? when it happens is irrelevant but are you using this tool to find which circuit is corrupt is what everyone is interested in.

I brought this tool for measuring long term voltage and current but I've never had to use it for overnight graphing
https://moosh.im/mooshimeter ;

Yes I have proven the obvious the battery does go flat….but ….it does not always go flat.

Through logging the battery over a period of days we now no the pattern of when it starts to go flat…otherwise we are just pissing in the wind.

On one of the logging events we put a switch on the alternator output lead so we also now know that the alternator is not the cause.

Yes we are interested in finding the cause, but you must appreciate why I posted here, another tool that we can all use without flattening endless current clamp batteries.

Perhaps I should put this logging devise on either side of of the logging devise leads…then I can calculate the actual current.

If you read your manual for your Mooshimeter that is how they recommend you use the Mooshimeter to measure current.

The BMW IBS (Intelligent Battery Sensor) works in the same way.

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Logic

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Re: Amp clamp for battery drain?
Reply #40 - Jan 28^th, 2017 at 12:55am

Spence wrote on Jan 27^th, 2017 at 7:24pm:

Hi Ian, do you have any captures where you used the shunt?

I cannot tell you what resistance shunt I used but it gives you the idea

You can use a maths channel to express it in mAmps or amps

So in this instance we have a 711 mV drop across the shunt

Let us say that the resistance across the shunt is 20 Ω

So using OHM's law V=R x I

then .711 = 20 x I

therefore I = 20/.711

=28.1294 amps

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1-5AMPCurrent_Probe.psdata (6 KB | 253 )

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Mick LSD Guide Offline I learn every day Posts: 7,471 Toronto 400ft Ontario Canada Gender:	Re: Amp clamp for battery drain? Reply #41 - Jan 28^th, 2017 at 6:35am Logic wrote on Jan 28^th, 2017 at 12:55am: Let us say that the resistance across the shunt is 20 Ω So using OHM's law V=R x I then .711 = 20 x I therefore I = 20/.711 =28.1294 amps The Calculator did its job but you may want to check your spelling after the numbers
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Spence

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Re: Amp clamp for battery drain?
Reply #42 - Jan 28^th, 2017 at 4:27pm

Logic wrote on Jan 28^th, 2017 at 12:55am:

Spence wrote on Jan 27^th, 2017 at 7:24pm:

Hi Ian, do you have any captures where you used the shunt?

I cannot tell you what resistance shunt I used but it gives you the idea

You can use a maths channel to express it in mAmps or amps

So in this instance we have a 711 mV drop across the shunt

Let us say that the resistance across the shunt is 20 Ω

So using OHM's law V=R x I

then .711 = 20 x I

therefore I = 20/.711

=28.1294 amps

Hey budd I think you got the numbers inverted.

Understandable being down under.

I think it's I = 0.771/20 = 0.03855 amps = 38.55 ma

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fisher Super Nerd Picogroup Offline I love YaBB 1G - SP1! Posts: 2,731 Concord California USA Gender:	Re: Amp clamp for battery drain? Reply #43 - Jan 28^th, 2017 at 7:15pm Yahhh by golly. Volts equals amps times ohms.
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Mick LSD Guide Offline I learn every day Posts: 7,471 Toronto 400ft Ontario Canada Gender:	Re: Amp clamp for battery drain? Reply #44 - Jan 28^th, 2017 at 8:00pm fisher wrote on Jan 28^th, 2017 at 7:15pm: Yahhh by golly. Volts equals amps times ohms. Don that is correct but the poster is looking for Amps so Amps equals volts/ohms
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