[time-nuts] 4 KV Power Supply Recommendations

J. Forster jfor at quik.com
Sun Jan 17 22:03:37 UTC 2010


I just looked at eBay and most everything suitable is well over $200.

-John

============


> 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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>
>
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