| Electronics > Beginners |
| Panel meter help |
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| nnills:
Hi I just bought 26 panel meters from "Marktplaats"(dutch ebay). Some of them are evident(voltage or shunt resistor written on it) but others I don't understand(shunt resistor/operation). Does one of you know? Here are the images(almost 20): https://imgur.com/a/9ZNBnjT |
| Totalsolutions:
Cannot see photos, voltage is volts as you know and shunt resistor must be current meters. You send the current through and “tap” off a small voltage from the shunt resistor. So the current meter’s are voltage meter’s really. Moving coil meter’s are voltage driven. Hopefully I am correct. |
| rdl:
Those are moving coil meters. The meter movement will have a specific current rating which gives full scale deflection. To measure a value other than that, shunt (parallel) or series resistors are added. These will often be internal to (inside) the meter. The resistor may be nothing more than a piece of wire when current is being measured. Sometimes, if you're lucky, the full scale deflection current is printed somewhere in the meter, often you have to figure it out by making measurements. |
| tooki:
--- Quote from: Totalsolutions on March 05, 2019, 06:50:26 pm ---Cannot see photos, voltage is volts as you know and shunt resistor must be current meters. You send the current through and “tap” off a small voltage from the shunt resistor. So the current meter’s are voltage meter’s really. Moving coil meter’s are voltage driven. Hopefully I am correct. --- End quote --- Nope, it's the exact opposite, moving-coil meters are current-driven. |
| nnills:
Thank you for your answer(I will eventually find out the right values). I'm new to the forum so what do I do now? Do I need to close the topic/question? |
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