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Learning. Need Advice.

karlitob · 2021-01-22 23:45:40

Hi all Bit of a steer required if you please. Trying to learn about more about electrics. Neighbour threw me in his faulty outdoor halogen PIR floodlight. He can hear the sensor click on, but no light coming on. Put new bulb in, no joy. 1) Rewired the cable that was attached to his mains to a plug. Can hear click. No…

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#32 22-02-2021 1:44am
whizbang

Registered Users Posts: 1,924 ✭✭✭

Join Date: September 2009

Posts: 1868

The transformer output is probably in the region of 50 - 150Khz, AC, with a high crest factor depending on load.
Almost no multimeter will correctly display the voltage from this.
You can use an oscilloscope, but best option is a Thermocouple Ammeter and a suitable resistor.

Specs on the transformer should say what frequency, and the Minimum load. ->this is important !
As previously mentioned, theres almost no output with no load. Its possible to use a resistor, but a 50Watt resistor is expensive.

One other thing, please measure the float voltage of the output to ground when its powered on. It can be up to 160Volts AC. Thats enough to smoke stuff!!

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