Chuck,

Wrong approach.  Do a quick tolerance analysis of your dividers and you
can see that even a small variation between the two dividers will easily
swamp any signal that you get across your metering resistor.  Measure
the output current on the low side.  Do you have access to the inside of
the "HV MODULE"?  These little supplies typically use a flyback or
cockroft-walton bridge in their output stage.  You need to insert your
metering resistor between the low side of the output stage and its local
ground.

Dave

Roberts II, Charles K. wrote:

>Hello All
>
>I am working on a PIC based High Voltage module. The schematic of the
>current meter portion of the module is attached. I am measuring the
>voltage drop across a knowm resistor, but to do it I had to use two
>voltage dividers to bring the levels to something I can read. I measure
>about the same current with or without a load. What could be going on?
>Loooking into the devider there are 50Meg Ohms to Ground, Is this what
>is messing up my reading?
>
>Thanks in Advance
>
>Chuck Roberts
>
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