Maybe I should think about replacing the battery in my beta unit some time soon
And still it keeps on going
And still it keeps on going
There are only 10 kinds of people in the world: those who understand binary and those who do not.
Re: And still it keeps on going
I assumed there would be a voltage limit with the calculator refusing to work below. Where is it?
WP43 SN00000, 34S, and 31S for obvious reasons; HP-35, 45, ..., 35S, 15CE, DM16L S/N# 00093, DM42β SN:00041
-
- Posts: 564
- Joined: Mon Apr 24, 2017 8:38 pm
Re: And still it keeps on going
Interesting font
Re: And still it keeps on going
Maybe it's in lemming mode?
I believe in free will. Just can't help it.
-
- Posts: 795
- Joined: Wed May 03, 2017 7:46 pm
- Location: Malone, NY USA
Re: And still it keeps on going
Yeah, but the alternate route isn't as fast!
Tom L
Some people call me inept but I'm as ept as anybody!
DM10L SN: 059/100
DM41X SN: 00023 (Beta)
DM41X SN: 00506 (Shipping)
DM42 SN: 00025 (Beta)
DM42 SN: 00221 (Shipping)
WP43 SN: 00025 (Prototype)
Some people call me inept but I'm as ept as anybody!
DM10L SN: 059/100
DM41X SN: 00023 (Beta)
DM41X SN: 00506 (Shipping)
DM42 SN: 00025 (Beta)
DM42 SN: 00221 (Shipping)
WP43 SN: 00025 (Prototype)
Re: And still it keeps on going
Processor data sheet says lower supply limit is 1.71v , although the Vbat monitoring is done internally via a divide by 3 network , so I wouldn’t like to rely on it being too accurate ....
Anyone actually physically measured battery voltage and then checked what the system reports ?
Re: And still it keeps on going
As the battery voltage goes down in stand-by mode, the battery internal resistance increases. That means that, under load, such as running a program, the battery voltage will sag more. Since the calculator battery meter has a filtered response time, it will not report the total depth of the sag during current surges.
Bottom line - by the time the battery reaches something like 2V at standby, you have consumed more than 90% of the battery's energy. I wouldn't take it to any kind of - for instance - college entrance exam, before replacing the cell.
Looking at the datasheet, the battery resistance increases 6x by the time the open cell voltage drops to 2V (bottom right graph on the datasheet):
http://data.energizer.com/pdfs/cr2032.pdf
Bottom line - by the time the battery reaches something like 2V at standby, you have consumed more than 90% of the battery's energy. I wouldn't take it to any kind of - for instance - college entrance exam, before replacing the cell.
Looking at the datasheet, the battery resistance increases 6x by the time the open cell voltage drops to 2V (bottom right graph on the datasheet):
http://data.energizer.com/pdfs/cr2032.pdf
HP-41C, 48SX, DM-42 s/n 830
Re: And still it keeps on going
You're preaching to the choir
I was deliberately running the battery down to see how the machine behaved with such a low power supply.
I was deliberately running the battery down to see how the machine behaved with such a low power supply.
There are only 10 kinds of people in the world: those who understand binary and those who do not.
Re: And still it keeps on going
So, you're looking to be killed?
--bob p
DM42: β00071 & 00282, DM41X: β00071 & 00656, DM10L: 071/100
DM42: β00071 & 00282, DM41X: β00071 & 00656, DM10L: 071/100