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HP 4274a measure with BIAS card


 

Dear All,?

Finally I collected all things for my 4274a with high voltage measurement.
The high voltage card working fine, but I can use it only on lower ranges in capacity mode.?
Video show what happen. Under 1uF looks like everything is okay but below 1uF I got Error 4. On the back the switch on the second position. =<2F
Video is here:


Whats wrong with the measure?

Thank you
Krisztian?

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