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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
radhoo wrote ...
However, trying to use this probe with my 50KV cascade supply, gives very poor results. The multimeter jumps between values, the biggest shown is 12 (12KV). Probably because of the high frequency currents.
Any idea on what am I missing? Do I need a capacitive divider? Do I need a combination of the two? Thanks.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Patrick wrote ...
im worried the resistors you and i bought are inductive to some degree, thats why your getting jumpy and bogus numbers with your 50kV CW.
Surely the C&W output is DC so the inductance of the resistors shouldn't be an issue after a brief settling time - unless perhaps there is a bad ripple floating on top of it, as I suggested above.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
i asummed bad ripple and higher then 60Hz operation... when i warned of possible inductance. EDIT: he was driving his CW with a ZVS so i can assume the freq is significant, Proud Mary. EDIT: i believe if there is not a "N" in the part mark, then they are inductive. dam it.
here is the PDF, for Vishay/Dale ROX: (look at the ROX 1-1/2 line) ]rox.pdf[/file]
I read Part mark as: DALE ROX-1-1/2S 200M0 FK 0950 the 09 is year the 50 is the week, i think.
i wonder if used in series, in even numbers, if the resistors can be arranged in counter-turn-series, to cancel the inductance.
here is the original package and label, MINE ARRIVED TODAY...YAY!
ROX150 200M FKLBS -- 11kV resistors
"FKLBS" suffix is defined as : -- Tolerance +-1% -- TCo, 100ppm -- Tin/Pb, Lacer -- Solid Body, Axial, AL2O3 They are definately inductive. and thats a problem.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I think those rdb's are to stop the measuring circuit being taken out instantly by an arc to ground, which would discharge the whole series string of capacitors through it.
Same as the resistors in series with the diodes, they protect the diodes from ground arcs.
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DIY High voltage probe
