#44 Poor Man's DC shunt to measure high current

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How to build a DC shunt to measure high currents that would otherwise fry your DMM.

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[RoadWarsOnSky1]

You sound like a guy who knows his stuff so I have a shunt question/problem I have come across.Anyway I am using a 20amp ammeter 75mv and I have a 75mv shunt 20a I have my ammeter connected to a wind turbine and the maximum current from my wind turbine is 17amps,But on a less windy day I produce 5amps but my ammeter is on reading 0.5amps.But I cant get a lower amperage shunt because they wind turbine will exceed the ratings.What is the probelm and do you know a solution

[ZeroFossilFuel]

A shunt is a very small known resistance that drops a calibrated amount of voltage across it as current flows through it. Your 20A ammeter already has a shunt built in. The meter movement is 75mV for full scale. By adding an external shunt you have two shunts in parallel. This will produce inaccurate measurements.

You COULD put your external shunt in series with your ammeter and a mV meter across it. Both meters will now show the same current and drop 150mV total. But that's redundant.

[paytontech]

Not t nitpick but 15mV is 15/1000V, not 15/100. II know you know that and just accidentally said the wrong thing. Happens to me too sometimes.

ref: 3:02

[ZeroFossilFuel]

@paytontech Yep. You're right.

[coilsinamotor]

so its a resistor

[ZeroFossilFuel]

@coilsinamotor yes

[InvalidMemberAccount]

You are doing REAL science!!

Great Work!

[MemrabPenhest]

I wish I'd watched this when you posted it yesterday. Would have saved me $10 on an amp meter and still will in the future.

Dropped ya a measly 5 bones on the paypal and would ** thoroughly encourage others to make some small donation ** .. even a buck. There are lots of folks posting electrolysis results on youboob, but you sir, are the only one supplying detailed explinations, whys and wherefores that we need to develop an understanding

It IS cold out in the garage lately, isn't it?

[Olwmatt]

i would like to copy your build, and would like to know more aabout connecting which wires to which posts

[Kalkaekie]

Enjoyed the video, very interesting, thanks !!

[ZeroFossilFuel]

@CADtekk Not bakelite. Masonite. Very common.

[coilsinamotor]

@ZeroFossilFuel oh i c