test downlight Transformer
- Thread starter dsuley
- Start date
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with a multimeter
How?
set it to AC measument and take reading on the OUTPUT side of the transformer. Although if you are not sure about doing this perhaps it's best that you get someone in to test as this needs to be done live.
Why do you want to test tthe transformer?
Why do you want to test tthe transformer?
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Note, some transformers do not work if there is no load on the output side.
If you have a suspect transformer I would
Put a known working lamp on the output side of the tranny.
If that lamp does not work then
check there is power going in to the input side (needs multimeter but this has to be done with the power on)
The other common reason for a tranny to stop working is if someone has put the wrong wattage lamps in.
If you have a suspect transformer I would
Put a known working lamp on the output side of the tranny.
If that lamp does not work then
check there is power going in to the input side (needs multimeter but this has to be done with the power on)
The other common reason for a tranny to stop working is if someone has put the wrong wattage lamps in.
Why do you want to test tthe transformer?[/quote]
Thanks for your answer, but why do you reckon i might be testing a transformer for? Because normally everyone checks the transformer to ensure whether it is working or not.
Thanks for your answer, but why do you reckon i might be testing a transformer for? Because normally everyone checks the transformer to ensure whether it is working or not.
Many thanks for your respons. I agree with you some will not work without a load on the output side. I wanted to know whether the resistence can be measured to show whether the transformer is working or not. If yes, I would really appereciate if you could help further.
Thank you
Most of the transformers do not have an iron transformer with windings so a resistance measurement will not work.
Mostly they are electronic components that will "transform" 230 volts AC to 12 volts (sort of) AC.
Mostly they are electronic components that will "transform" 230 volts AC to 12 volts (sort of) AC.
Thats helpful, many thanks.
Here's the inside of one.
There is a coil on the left hand side (mains input) that you may be able to measure.
The coil on the right hand side is just a choke but inbetween the two (under the metal shield, there is a whole raft of electrical components. You cant (easily) test those.
They are pretty cheap and not worth the bother of repairing.
There is a coil on the left hand side (mains input) that you may be able to measure.
The coil on the right hand side is just a choke but inbetween the two (under the metal shield, there is a whole raft of electrical components. You cant (easily) test those.
They are pretty cheap and not worth the bother of repairing.
The best way to test one is to put a known working lamp on the output (via a known working lamp cap).
Electronic transformers will shut down with no load and output a high frequency 12v, not 50hz, this means the majority of digital multimeters are unable to measure the voltage.
Electronic transformers will shut down with no load and output a high frequency 12v, not 50hz, this means the majority of digital multimeters are unable to measure the voltage.
You didn't mention didly about multimeters not being capable of measuring the output
I didn't bother with that as
Often a multimeter on the output side of a working tranny shows no output because
I think he's got the full story now, though!
should be a belt and braces method.
Often a multimeter on the output side of a working tranny shows no output because
I think he's got the full story now, though!
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