Which Shunt?

[Tink]

I have a 150A DC meter and need to know what shunt to use with it. It says on the face to use and external shunt and also 'FS=50mV. Does this mean I need a 150A 50mV shunt? If so can I use anything above 150A and do I have to stay with the 50mV. Is there any lead way in these values? I'm assuming FS means full scale?

Thanks, this is a great fourm.

Tink

[juddley]

Yes, the 50 mV is likely Milli Volt as a meter in that range would not generally be a Micro volt. FS does mean full scale...

150amp is not a common size but readily available in US... Mouser part # 580-39-1734106 but pricey at $23.45.... also RCD has one SVM50150 50mV 150A sold through Allied (but not in online catalog .... likely special order)

Google found several under "Marine" suppliers.... all very, very pricey.

Judd

[wpowokal]

50 mV is the critical parameter, what the meter reads can be changed, if you say wanted to measure 15 anps then you need a 15 amp shunt that give 50mV @15 amps.

Or say 50 amps then you need a shunt that gives 50 mV @ 50 amps, the scaling on the meter can always be changed it's only a visual thing.

Choosing a shunt that is way over range ie a 150 amp shunt when you only need to measure 15 amps will not be very accurate at the lower end of the scale.

allan down under

[Tink]

Thanks for the feedback....yep they are pricy. But this looks like a very good meter and I don't mind puting out the money. I did fry a meter before and didn't want to do that again. I'll proceed as suggested.

thanks again,

Tink

[wellusee]

Can anyone direct me or link me to the spot where they describe how to measure each phase before it goes into the rectifier? The turbine is spinning it's the 24volt 10'.

I just would like to see if the 3 phases are giving the same power.

Paddy.

[wellusee]

Ah ' found it (the link to Google search) Flux explained everything in detail.

  It helps if one signs in when they log on to the site.

P.