[time-nuts] 4 KV Power Supply Recommendations

[John Miles]

The small Bertan modules in particular are extremely stable and
well-behaved.  You get exactly the voltage that you program, accurate to
within about a tenth of a percent.  No spikes, no drift, and no obnoxious AF
whine like you get from the HP modules.

The smaller ones are good for 500 uA, and the larger modules are good for
2-5 mA depending on model.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of J. Forster
> Sent: Sunday, January 17, 2010 8:00 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 4 KV Power Supply Recommendations
>
>
> The small modules are nice, but many PMT supplies do not go to 5 mA. 5 mA
> @ 4 KV is 20 Watts output, more at the input. That's a lot for a PMT
> supply.
>
> Also, remember that some supplies designed for gas lasers have a HV "kick"
> at startup that may go to 20-30 KV.
>
> -John
>
> ==============
>
>
> >
> >> Since it appears to be making some progress, I'd be tempted to just
> >> continue. The pump rate of an ion pump varies with the current, so it
> >> seems you are pumping, just somewhat more slowly than w/ the external
> >> supply, as long as you are not overloading the internal supply.
> >>
> >> If you don't have a lab supply, get an old transformer from some vaccum
> >> tube gear and use the HV secondary to drive a Cockroft-Walton
> multiplier
> >> to get to what you want. Pretty trivial to build these days. Put the
> >> primary on a Variac to adjust the voltage.
> >>
> >> BTW, a commercial supply at that voltage and current is going to cost
> >> several hundred dollars.
> >
> > The nicer Glassman rack-mounted supplies are spendy, but smaller HV
> > modules
> > for PMT and laser work are common and inexpensive.  Go to eBay
> and search
> > for "<manufacturer> supply", where common manufacturers include Emco,
> > Bertan, Spellman, Fluke, and Glassman.  E.g. item 220539685243 .  These
> > smaller modules tend to sell for well under $100, and are handy to have
> > around.
> >
> > -- john, KE5FX
>
>
>
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