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'[EE] Fwd: special-purpose electrical meter'
2006\01\09@162304 by

>From another list I'm on.  Any clues I can pass on?

The 1500Khz sounds wrong, but what do I know?

Thanks,
Bill

---------- Forwarded message ----------

I have a Gateway laptop that I've been slowly breaking over the course of
the last month.  My latest problem is with the LCD backlight inverter.  I
called the guy from whom I bought the last part I needed, and asked him how
I can test the inverter I have.

"You can't test it."

"Can't?  Why can't I just check the voltage out to the light with a meter?"

"You don't have a meter that can measure that."

Long, (not particularly amusing) story short, I need a meter that can
measure "1500 volts at 1500KHz".  Is that something that any of you have
sitting around your garage/basement/wife's side of the bed?

--
Psst...  Hey, you... Buddy...  Want a kitten?  straycatblues.petfinder.org

It depends on how much current the suppy is capable of?  Make a 10:1
resistive divider of 10 1/4w resistors (maybe 100K or 1M). Tapping off at
1/10 look at it with a scope or 10 meg DVM.
Take the meter or scope probe impedance into consideration.

It may designed for so low current, that anything you do will kill it?

{Original Message removed}
>
>
> Long, (not particularly amusing) story short, I need a meter that can
> measure "1500 volts at 1500KHz".  Is that something that any of you have
> sitting around your garage/basement/wife's side of the bed?

Scope with high voltage probe.

Use an oscilloscope with a voltage divider on the front of it.

Regards,

Jim

{Quote hidden}

> --
At 02:23 PM 1/9/2006, William Couture wrote:
> >From another list I'm on.  Any clues I can pass on?
>
>Long, (not particularly amusing) story short, I need a meter that can
>measure "1500 volts at 1500KHz".  Is that something that any of you have
>sitting around your garage/basement/wife's side of the bed?

I wasn't aware that CCFL back-lights where running up at that
frequency - seems very high.

I'd verify that first: just hold a scope probe near the back or side
of the LCD panel and see what is being radiated.  It should be a sine wave.

Once you know the real frequency, you can look at borrowing or
building a divider to match the expected signal to your scope.

dwayne

--
Dwayne Reid   <dwaynerplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

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>
>
> >Long, (not particularly amusing) story short, I need a meter that can
> >measure "1500 volts at 1500KHz".  Is that something that any of you have
> >sitting around your garage/basement/wife's side of the bed?
>
> I wasn't aware that CCFL back-lights where running up at that
> frequency - seems very high.

It's not out of reason.  I have some articles by Jim Williams, talking about
operating at 500kHz

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