Pretty much agree with Dave M. But just like HP, PDI had their basic supplies and their 'low noise/ripple' models, and of course the model with the heater for voltage stability. The one Dave is talking about has a temp controlled voltage reference. The easiest way to tell is there is a 'HEATER' light on the front panel.
I'll toss in a 3rd company, Kepco. So for me its PDI, Kepco, and a HP. Sounds like I should finish that web page I started of the low noise/ripple models from the three makes. On Sun, Feb 28, 2016 at 7:25 PM, Dave M <[email protected]> wrote: > Pete Lancashire wrote: > >> ... I was using an HP lab supply>>> >> >> Model ? Age ? >> >> My bench has some pretty old HP's even Harrison Lab branded supplies. >> I >> have had to re-cap a few of them. >> In a way it is almost a curse how reliable their supplies were. You >> always got the V and I you wanted so one >> never thought about the filtering getting worse over the years. >> >> Also HP had two variations of their bench supplies. The basic ones >> and the low noise versions. When I need >> to make measurement like this, I make sure I'm using one of the low >> noise/ripple models. >> >> > Adding my few cents' worth to the power supply ripple/noise thoughts, I've > found that the old linear supplies by Power Designs Inc were among the > best, at considerably lower cost than the HP/Harrison Labs units. > Ripple/Noise in the low millivolts and high microvolts, 0.01 - 0.005% > regulation and temperature stability in the neighborhood of 0.01%/degC were > common. > I have a couple on my bench, and they just keep on working. They still > pop up at auction frequently. > > Cheers, > Dave M > > _______________________________________________ > 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. > _______________________________________________ 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.
