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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
