Hello All!

I recently was looking at a power converter as a possible problem with a
flatpanel monitor.

When I placed a VOM on a 12VDC ac/dc power converter I measured 14 or better
volts. I was hoping someone in here could tell me if this is normal, and if
it is safe with a device that specifies 12V for power input.

I measured several other 12VDC power converters and received higher than the
listed output by 50% in one case (18VDC). It would seem to me that this
would damage a device. Obviously I'm wrong but I would like to understand
why this is.

Any help in understanding this is greatly appreciated!

Sincerely,

Jed

"Jed" wrote in message
. 125.201...
Hello All!

I recently was looking at a power converter as a possible problem with a
flatpanel monitor.

When I placed a VOM on a 12VDC ac/dc power converter I measured 14 or
better
volts. I was hoping someone in here could tell me if this is normal, and
if
it is safe with a device that specifies 12V for power input.

I measured several other 12VDC power converters and received higher than
the
listed output by 50% in one case (18VDC). It would seem to me that this
would damage a device. Obviously I'm wrong but I would like to understand
why this is.

Any help in understanding this is greatly appreciated!

Sincerely,

Jed

Depends on the device. If it is a big supply rated at several amps or more
and is to run equipment usually ran in a car the voltage is normally set at
13.8 volts. This is the "standard" voltage of a car charging system with
the motor running.

If it is a wall cube, they are not usually regulated. The volage will be
somewhat higher than 12 volts and drop under load to near 12 volts.
If the supply just has a rectifier and capacitor in it and is unloaded it
will be the roughly 12 volts times about 1.4 (peak part of a 12 volt ac rms
reading). Think that 1.4 is close for the multiplier. This is because the
capacitor will charge near the peak voltage of the sine wave.

Ralph Mowery uttered with a toothy grin in sci.electronics.repair:

"Jed" wrote in message
. 125.201...
Hello All!

I recently was looking at a power converter as a possible problem with
a flatpanel monitor.

When I placed a VOM on a 12VDC ac/dc power converter I measured 14 or
better
volts. I was hoping someone in here could tell me if this is normal,
....
Depends on the device. If it is a big supply rated at several amps or
more and is to run equipment usually ran in a car the voltage is
normally set at 13.8 volts. This is the "standard" voltage of a car
charging system with the motor running.

If it is a wall cube, they are not usually regulated. The volage will
be somewhat higher than 12 volts and drop under load to near 12 volts.
If the supply just has a rectifier and capacitor in it and is unloaded
it will be the roughly 12 volts times about 1.4 (peak part of a 12 volt
ac rms reading). Think that 1.4 is close for the multiplier. This is
because the capacitor will charge near the peak voltage of the sine
wave.




Thak you!