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Old 12th Jun 2018, 9:52 am   #42
Herald1360
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Location: Leominster, Herefordshire, UK.
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Default Re: Wiring a desk electric fan.

Quote:
Originally Posted by Lucifer View Post
I have taken a wiring diagram of a modern fan(image enclosed) I don't know whether or not this will be the same as the wirings from my fan. I am also experiencing a lot of fluctuation whilst taking readings between the wires.(image enclosed of my meter)
Some DMMs don't work well trying to measure the resistance of an inductive load like a motor winding. If you don't have another meter, you could try putting 100 ohm resistor in series with the meter and then subtracting it from the readings if they then settle down OK.

Edit- just seen the AVO7! You'll only need the D cell for lowish resistance readings, the hard to get 15V one is used for the highest resistance range only.

Take care not to connect yourself across the motor winding when connecting or disconnecting the old meter, it can generate a nasty voltage spike as it is disconnected! (Same principle is used in a car ignition coil)
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Last edited by Herald1360; 12th Jun 2018 at 10:03 am.
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