[ARC5] Oscope Fixed

[Michael Hanz]

The application note says it's a bleeder resistor, so presumably you 
should just return it to ground when the instrument is turned off. It 
would dissipate about 3 watts at 30kV, so I'm not sure it should simply 
be tied to ground permanently, even though the current drain at that 
voltage would only be .1mA.  That seems well within the 2mA spec on the 
multiplier, though.  I suppose you could also use it as part of a 
feedback loop for output voltage regulation.  It all depends on what you 
are feeding it with.  Did you check the input voltage to the multiplier?

-  Mike  KC4TOS

On 4/5/2018 11:07 AM, Robert Eleazer wrote:
> Ihooked up the NTE535 voltage multiplier to the Tek 2225 Oscope this 
> morning, and got nothing, no trace.  The HV input from the Oscope 
> power supply is going to the NTE535, and the Focus and Ground 
> connections are hooked up to the appropriate points.
> I note that the voltage multiplier has an extra connection not present 
> on the original component, marked "Control."  The schematic for the 
> NTE535 shows that the Control connection is linked to the HV output 
> through a 300Mohm resistance.
> Anybody know what the Control connection should be hooked to?
> Wayne
> WB5WSV
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