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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: RE: Output voltage varies between AC and batteryPosted by Romy the Cat on: 1/7/2011
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 manisandher wrote: |
| Also, when I switch from AC to battery, the output voltage (as measured by a true RMS voltmeter) INCREASES by between 3-4V. Now, I am NOT suggesting that this increase in voltage is causing the difference in SQ. However, it's 100% clear to me that the output of the PP2000 is different depending on whether it's being run from AC or battery. |
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The change of the voltage from battery and from AC always was there, I have seen it on all PurePower Units but I did not even report it as I find it absolutely irrelevant. It has to do with the way how the DC-DC converter regulated that upsize voltage from 72V to input of output amps. Ideally I am sure it is possible to have the unit calibrated that from battery and from AC it will deliver absolutely identical voltage and PurePower shall not be Tektronix of Rohde & Schwarz to do it. However, as a practical matter I find it absolutely not-necessary. The cruse voltage, would it be 117V or 123V, is kind of irrelevant as long it is stabilized. You reset you unregulated fix bias tubes for this voltage and juts forger about voltage. I would like to remind you that if you have a properly operating PP2000 then you never will or have a need to switch it to buttery, NEVER. So, you will never experience the AC/buttery voltage fluctuation.
BTW, the default cruse voltage that UPS devises output from AC is usually easy adjustable. I have two other on-line UPS units from APC that I use for my computer servers and they can do it. I am sure that PurePower unit can do it as well but I never cared to ask about it and even if I knew how to do it then I do not think that I would care to many any voltage adjustments. So, in my mind the difference between output voltage from AC and battery indicates nothing.
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