Hi all, back from lurking around here after my post-vacation-catchup.
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Uploaded the HP 66311B teardown peek inside/testing pics at last. Not a full teardown as this thing is complex to disassemble and I had limited time and wanted to get to the testing bit. Fair warning, pic heavy post:
Front panel is a bit grubby, with a missing twirly-knob, the feet are missing, but at least there's no stupid tilting handle to remove. The dimple on the right side promises a useful hole in the moulding, hopefully there are at least two and preferably four, so I can add binding posts:
![](https://i49.servimg.com/u/f49/16/28/02/75/grubby10.jpg)
Bloody hell no wonder this thing is heavy, the case is 1.5mm thick, and near 400mm long! The transformer has a ludicrous number of taps, and looks at least 200VA, and like the K2000 it's mounted at the wrong end of the case!
![](https://i49.servimg.com/u/f49/16/28/02/75/66311_10.jpg)
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Yeah, nice typical construction of the time.
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The transformer is at the right end of the case, indeed.
This nice little lab supply is not made for bench use only. For use in test systems, typically mounted in racks, the transformer at the front is nearest to the mechanical mounting point of the unit -minimizing the length of the lever.
Yup, it's really there... I am very impressed with the accuracy of the metering on this power supply, seems like I can stop looking for a precision supply as I now have one. I'm guessing the offsets I had to program in are possibly down to my hastily improvised output leads. I did make them twisted pairs as per the manual, but perhaps they are too small a gauge (0.22mm2).
I tried various loads, and linking them in and out was unable to get the output voltage to deviate by more than 200uV. Sadly this human forgot to make any noise measurements, I'll get to that later when I have the time (to warm all the units up and make a nice clean measuring setup).
Congrats, you got an nice working unit there. Order the missing knob and some nice binding posts and you'll have a real nice bench supply!
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