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newRPL: [UPDATED April 27-2017] Firmware for testing available for download
04-11-2016, 07:36 PM
Post: #252
RE: newRPL: [UPDATED Mar-09-16] Power consumption high?
Since flashing my HP-49g+ with newRPL on more than one occasion the machine wouldn't switch on because the batteries were flat. I have blamed myself for leaving it turned on as after all there is no auto-power-off yet.

This evening I decided to measure the current drawn by the calculator. I put two strips of copper separated by an insulator in series with the final positive battery terminal and connected the strips to a meter set to its 200mA range. The calculator switched on when the circuit was complete; the current drawn was 80mA. Switching it off via the keyboard, the current dropped to 10mA. Switching on again, this time via the keyboard, the current drawn was about 40mA. The current drawn when switched off was still about 10mA.

These "off" currents seem far too high (and the "on" currents as well, although I'm less certain about those). Can anyone else confirm them? In particular, does the HP-50g when flashed with newRPL suffer from the same problem?

Nigel (UK)

(In case you are wondering - I definitely mean mA, not microamps!)
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RE: newRPL: [UPDATED Mar-09-16] Power consumption high? - Nigel (UK) - 04-11-2016 07:36 PM



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