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Velleman AIM6030A 30A DC Panel Meter
Will this meter work for a 12 volt battery charger ? Thanks
How to wire the Velleman AIM6030A 30A DC Panel Meter into an AC power circut?
Are these meters only useful for high current DC aplications (automobile woofers?)Can I build a shunt in an AC power line and use this meter?
The shunt doesn't care if the current through it is AC or DC. What matters is that the voltage formed across the shunt when a current is flowing through it is fairly small and is probably too small, even with a 30 ampere current, to overcome the forward drop of any diodes you might use to rectify the AC "shunt voltage" (probably measurable in millivolts across the shunt) to a DC voltage which can be used to drive the meter. Remember, the voltage applied to the meter is equal to the current through the meter multiplied by the resistance of the meter coil. It takes very little applied voltage to smoke a meter movement. Unfortunately, even diodes with low forward voltages don't conduct significantly until about 0.3 volts, and this is probably about all the voltage you'll get from the shunt at full current. If you want to get complicated you can probably use a transformer to boost the voltage, then rectify it, then voltage divide it down to a safe level for the meter. Try a small 12 volt transformer with the secondary connected across the shunt. Then run the primary to a full wave bridge (use schottky diodes) and apply the output of the bridge to a potentiometer, maybe 10Kohms. Connect your meter from the wiper of the pot to the "low" terminal of the pot. Then SLOWLY turn up the pot until you get a reading. The accuracy will be poor at low currents and better at higher currents. I'm assuming your AC source is regular 60 Hz AC line power. If you need more voltage, use a 6 volt transformer, which will multiply the shunt voltage by about 20. You will need to calibrate your meter against a known accurate current meter. Good luck!
Date published: 2011-04-23