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Recommanded NiMh battery cells for HP82162A
09-25-2017, 11:04 AM (This post was last modified: 09-25-2017 11:05 AM by Dieter.)
Post: #22
RE: Recommanded NiMh battery cells for HP82162A
(09-25-2017 10:43 AM)Neve Wrote:  Charging did not reduce the output, repeated use of the calculator and card reader did. I just can seem to bring it back to it’s original output value of 5.8v. I am positive it was 5.8v. I even checked the next day after extensive use of the card reader and the DVM read 5.0v or 5.1v.

Sounds reasonable.

(09-25-2017 10:43 AM)Neve Wrote:  Worthy to note that my power adapter specifies an output of 3VA/8V.
I have no way of measuring the current, but the AC output of mine is 12V!
It’s a 82066B Eurocharger.

I have the same version here. The stated output on the AC-adapter is merely a nominal value, usually rated at full load. So at 375 mA the output should be close to 8 V AC. On the other hand you are measuring the open circuit voltage (no load), or maybe the voltage with just a few mA current. Here the voltage can and will be much higher. This is perfectly normal, I seem to remember even values like 14 V and more. Essentially this is just a transformer, not a regulated power supply, so the lower the applied load, the higher the output voltage.

(09-25-2017 10:43 AM)Neve Wrote:  Although I can’t read German, I can tell you that my battery pack is the one from your first link with the 2-prong outlet. Not the 3-prong one seen on the second link.

Fine, that's the newer version. It should contain a 78L12 regulator and a 365 Ohm resistor.

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RE: Recommanded NiMh battery cells for HP82162A - Dieter - 09-25-2017 11:04 AM

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