HP Prime G2 currents

[eried]

(02-13-2020 10:27 PM)DrDarius Wrote:  After a discussion about charging current, I decided to follow up and measure G2 calculator working currents. Since the battery capacity is known (2Ah), it may be helpful for estimating the battery lifetime under given circumstances.
The currents were measured on the battery terminals.

The results for the calculator after reset were:
Calculator off - 1.61mA
Calculator off, extra low power mode - 94.5uA
Calculator on, max. brightness, idle - 127.3mA *)
Calculator on, max. brightness. running program - 166.4mA *)
Calculator on, min. brightness, idle - 92.3mA *)
Calculator on, min. brightness. running program - 125.5mA *)

In addition:
For the calculator on, max. brightness, idle, the currents for different screen refresh ratios were:
Max. screen refresh ratio - 128.5mA *)
Min. screen refresh ratio - 112.8mA *)

*) Average. The current was oscillating around this value. The meter showed max/min values staying within +/-1mA from the average, but the real peak values might be higher/lower because of the meter's slow response.

Experiment details:
The currents were measured with Fluke 87V multimeter.
The extra low power mode current was measured on uA range (100.71 Ohm serial resistance), other currents on mA range (1.81 Ohm serial resistance), in HiRes mode (slower conversion). The meter serial resistances were measured; doing it like this was faster than searching for them in the meter's user manual. Call me lazy.

Darius

Those values look slightly (5%-15%) higher than the G1, which makes sense.
http://www.hp-prime.de/files/composite_f...report.pdf

The "ultra low power mode" was not included on the test.