Agilent 6227B and others with analog readout -- tuning resolution?

[braincat]

Folks,

I am thinking of getting an older power supply from Ebay, e.g. 6227B -- could you please comment on whether the knobs allow fine-tuning the output voltage, for example, to 3.3V (it would seem I would have to use an external multimeter in any case because of analog voltmeter).
Thank you.

[alm]

I doubt there are any 6227B power supplies with Agilent branding, given that the Agilent name appeared around 2000, and these power supplies were probably made until the early nineties.

If you look at the HP 6227B specifications, they specify the resolution of the fine control knob on the 6227B as 5 mV / 1 mA, so it should be able to get pretty close to 3.3 V. Of course the resolution of the panel meter will be less.

[David Hess]

A good potentiometer has a settability of 0.1% (1) so over a 25 volt range, that is 25 millivolts.  But with coarse and fine controls, that is not a problem.  It looks like a really nice power supply.

(1) - Page 30, Troubleshooting Analog Circuits page, Robert Pease