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#1
Posted to alt.electronics
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Amp & Vol. Meters add ons
I have a 40 amp, 13.8v supply and would like to add a voltage (0-15v) meter
and an amp (0-50amp) meter. The meters look frail and I can't imagine running all that current through those flimsy connectors and tiny meter coil. I have no paperwork on the meters and was wondering if I need a shunt resistor or something to take all that current. Any ideas? Thank you. Cordially, west |
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#2
Posted to alt.electronics
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Amp & Vol. Meters add ons
On 2006-12-18, west wrote:
I have a 40 amp, 13.8v supply and would like to add a voltage (0-15v) meter and an amp (0-50amp) meter. The meters look frail and I can't imagine running all that current through those flimsy connectors and tiny meter coil. I have no paperwork on the meters and was wondering if I need a shunt resistor or something to take all that current. Any ideas? Thank you. voltmeters only need thin wires. the ammeter should have a shunt, it may be fitted internally. the wires from the shunt to the meter movement needn't be thick. -- Bye. Jasen |
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#3
Posted to alt.electronics
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Amp & Vol. Meters add ons
On Mon, 18 Dec 2006 05:00:24 GMT, "west" wrote:
I have a 40 amp, 13.8v supply and would like to add a voltage (0-15v) meter and an amp (0-50amp) meter. The meters look frail and I can't imagine running all that current through those flimsy connectors and tiny meter coil. I have no paperwork on the meters and was wondering if I need a shunt resistor or something to take all that current. Any ideas? Thank you. Cordially, west yes, you almost certainly need a shunt. Does the amp meter have any marking on the face to indicate what the meter's current rating is? Without that it can be hard to calibrate a shunt... |
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#4
Posted to alt.electronics
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Amp & Vol. Meters add ons
On Mon, 18 Dec 2006 05:00:24 GMT, "west" wrote:
I have a 40 amp, 13.8v supply and would like to add a voltage (0-15v) meter and an amp (0-50amp) meter. The meters look frail and I can't imagine running all that current through those flimsy connectors and tiny meter coil. I have no paperwork on the meters and was wondering if I need a shunt resistor or something to take all that current. Any ideas? Thank you. Cordially, west Read Rod Elliot's article on meters to make shunts and multipliers. http://sound.westhost.com/articles/meters.htm |
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