Checking voltage on LED power supply ?
Not RV related per se, but figured someone here would know. I recently purchased a set of LED lights to put some path lights to avoid tripping. Hooked up the lights and everything works fine. Ne...
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For those that doubt that a switching power supply can present a AC output, I am posting some pix..
This is a power supply that came with 12V undercounter halogen puck lights..
Click For Full-Size Image.
It is a twin 60W supply (total of 120W),length is about 5.25", width about 1.5", thickness maybe 3/4".
From the dimensions alone it would be impossible to be a 60hz transformer..
Not to mention it is designed to be "dimmable" using a standard triac based dimmer..
Click For Full-Size Image.
Click For Full-Size Image.
You will notice on the close ups it lists the output CLEARLY as 11.5V AC, not DC.. Doesn't say if what the output frequency is but I believe it will be at the switching frequency.
I checked output with several different brand DMM meters, no load neither DMM registered any voltage.
Adding one incadescent bulb one meter registered 8V, the other 6V..
So, depending on the meter, it IS possible that the meter may not be able to register AC frequencies above or below typical 50hz/60hz correctly or at all..
This is where a analog meter might be the way to go, I have one good analog multimeter but it is packed away so I not gonna bother testing this any further..
This is a power supply that came with 12V undercounter halogen puck lights..
Click For Full-Size Image.It is a twin 60W supply (total of 120W),length is about 5.25", width about 1.5", thickness maybe 3/4".
From the dimensions alone it would be impossible to be a 60hz transformer..
Not to mention it is designed to be "dimmable" using a standard triac based dimmer..
Click For Full-Size Image.
Click For Full-Size Image.You will notice on the close ups it lists the output CLEARLY as 11.5V AC, not DC.. Doesn't say if what the output frequency is but I believe it will be at the switching frequency.
I checked output with several different brand DMM meters, no load neither DMM registered any voltage.
Adding one incadescent bulb one meter registered 8V, the other 6V..
So, depending on the meter, it IS possible that the meter may not be able to register AC frequencies above or below typical 50hz/60hz correctly or at all..
This is where a analog meter might be the way to go, I have one good analog multimeter but it is packed away so I not gonna bother testing this any further..
