Make use of a multimeter to examine the resistance concerning mains pins within the plug - for almost any clock motor, assume some thing in excess of 2k ohms for 230V and 1k for 120V motors. Have a Observe of your resistance reading through, because you'll require it later.
If almost nothing else, this method buys some significant reassurance. One particular in particular was another on my listing.
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There is in fact very little difference between this technique and also the turns/Volt calculation performed at the conclusion of the final exam, other than this time we use really heavy gauge wire to minimise resistance consequences within the examination procedure.
Beware! This requires you to generate likely lethal connections, and all connections has to be insulated to prevent accidental Make contact with. A diagram demonstrating how you can take the measurement is revealed over.
Whilst to some degree in need of the figure calculated ahead of, it is not unreasonable. At least we recognize that we're in the appropriate region. Had the second calculation proven (one example is) one,500 turns had been needed, then it is clear that a slip-up have to have been designed someplace. At this stage, you'd likely have to go back to the beginning and re-do the measurements.
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8 Hammond Electrical Alarm Clock The Hammond clock utilizes a completely unique style of synchronous motor, but The fundamental principle is the exact same. We must go ahead and take exact same measurements, and run exactly the same Preliminary test method to determine the the best possible amount of turns.
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Now, measure the exact voltage and existing drawn. Make use of the 1 Ohm resistor once again, mainly because it's A lot safer for the meter to do it this way. Measure the voltage across the resistor to find out current, and evaluate the voltage straight across the motor - not the availability voltage!
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For this reason, if a number of clocks are linked to the identical transformer and one develops a fault, a lethal issue can nonetheless be produced. For these causes, I dislike the thought of utilizing mains isolation transformers apart from under really unique conditions.