newRPL: [UPDATED April 27-2017] Firmware for testing available for download

[Nigel (UK)]

(04-12-2016 10:09 AM)Nigel (UK) Wrote:  

(04-12-2016 08:10 AM)Nigel (UK) Wrote:  Just to confirm my readings (this time with a proper power supply and crocodile clips):

• Current when power is first applied - 82.4 mA
• Current when switched off: 4.2 mA
• Current when switched on from the keyboard: 42.4 mA
• Current when switched off again from the keyboard - 6.8 mA
  

Subsequent currents are all close to 42mA (on) and between 5mA and 10mA (off).

Nigel (UK)

One extra piece of information that might give a clue: I've left the calculator turned off for about 2 hours and the current settled at about 4 mA. Removing the SD card causes the current to jump up to 10 mA. Re-inserting the card causes the current to drop back to 4 mA again, even before the card is properly seated. Simply having the card mostly in without pushing causes the current to drop.

Nigel (UK)

One further piece of information: I've re-flashed my HP-49g+ with the HP ROM 2.15. Current when turned on is 12 mA (with big pulses when keys are pressed); current when turned off is 18 microamps.

Edit: to be clear, I didn't notice the current pulses when pressing keys with the newRPL firmware installed. The current was high all the time.

Nigel (UK)