[GreenKeys] Meter shunting...

[Bruce Gentry]

It is certainly possible to find plenty 100 MA. meters that do not 
require an external shunt, but the meter in question may have come from 
a control panel or instrument. In that application, one meter may have 
been used to monitor more than one circuit, so having shunt resistors in 
each circuit permanently and switching the meter to them is easier. It 
also means the circuit being monitored is never broken by the meter switch.

    Bruce KA2IVY

On 5/7/17 2:32 PM, Jack wrote:
>
> While many meters would require external shunts, it’s odd that the
>
> meter is labeled 0-100 ma. and would need a shunt. Maybe you need to 
> be sure
>
> the metering point you’re looking at has the series resistor for
>
> the loop current adjustment.   Do you have any means to independently
>
> test confirm loop current?
>
> Jack K2TTY
>
> *From:*GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] *On Behalf 
> Of *Kenneth Gartland
> *Sent:* Sunday, May 7, 2017 2:00 PM
> *To:* greenkeys <GreenKeys at mailman.qth.net>
> *Subject:* [GreenKeys] Meter shunting...
>
> Hi all!
>
> My express thanks for all the replies on the meter shunting
>
> issue...
>
> It never ceases to amaze me of the resources available
>
> on Greenkeys to help others...
>
> I did dis-assemble the meter in question, a Simpson
>
> Model 127, 0-100ma...
>
> There doesn't. appear to be any internal shunting...
>
> They were originally used in rackmount panels to
>
> adjust individual loop circuits...
>
> Thanks again to all who helped/responded...
>
> Cheers!
>
> Ken
>
> VE3-HMQ
>
>
>
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