NP25 Current Consumption / ucurrent

[TomC]

To those interested:

I've been 'using' one of the fine NP25 units from Jim Johnson.
[Thanks Jim Johnson / Chris Chung]

I've done some preliminary measurements using a 3V power supply and the uCurrent from Dave Jones.
[Thanks Dave Jones]

Current consumption is very close to 1.2mA - regardless of P/R mode or slow/fast mode.

Here are some of the modes:

1. 0.00 in display (wakeup).
2. Program running.
3. Full display (-8.88888888-88).

The ucurrent module makes these measurements most easy - including being able to view the transient nature of the current on an oscilloscope. I am using a ucurrent Gold which has bandwidth of 300kHz; it sufficiently shows much of the transient nature of the current draw. I will have to study the display/keyboard strobing to better understand the timing. I may work on a higher bandwidth current measurement too.

All for now,
TomC
From lovely/autumn Detroit, Michigan, USA, 3rd Stone.