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+--- Forum: Not quite HP Calculators - but related (/forum-8.html)
+--- Thread: WP34 resets when using Y^X (/thread-788.html)
WP34 resets when using Y^X - Randy - 02-28-2014 02:03 AM
The subject says it all. When I attempt to use Y^X, the WP34 resets.
I have tried reflashing with the latest 3.2(Printer)3472 with no change.
This happens on both of my 34s.
I must have something set wrong.
Randy
RE: WP34 resets when using Y^X - Paul Dale - 02-28-2014 02:11 AM
Check your batteries? That function is pretty compute heavy and will push the device to full clock speed for the duration and with marginal batteries that can cause problems.
I use that function a lot and it doesn't cause a reset for me, so there is something weird going on.
- Pauli
RE: WP34 resets when using Y^X - Randy - 02-28-2014 03:22 AM
You are correct sir.
The batteries measure 3.0 volts and the new ones are 3.2.
I'm supposed to know this stuff!
Thanks
RE: WP34 resets when using Y^X - Jonathan Cameron - 02-28-2014 06:07 PM
What is the minimum "safe" voltage of the WP-34s?
From the manual I see that batteries with voltage less thatn 2.8 V should be replaced. But this thread seems to hint 2.8 V may not be enough. I received refurbished HP-30b units from ebay and they all had a voltage of 3.0 V. I'm wondering what the life will be on these units and whether I should consider replacing the batteries immediately (if the nominal new voltage is more like 3.2 V).
-Jonathan
RE: WP34 resets when using Y^X - walter b - 02-28-2014 09:44 PM
(02-28-2014 06:07 PM)Jonathan Cameron Wrote: What is the minimum "safe" voltage of the WP-34s?
From the manual I see that batteries with voltage less thatn 2.8 V should be replaced. But this thread seems to hint 2.8 V may not be enough. I received refurbished HP-30b units from ebay and they all had a voltage of 3.0 V. I'm wondering what the life will be on these units and whether I should consider replacing the batteries immediately (if the nominal new voltage is more like 3.2 V).
Hmmh, what is "safe"? If you call SAVE every once and a while, everything is voltage-break safe on the WP 34S. Also compare p. 44 and the voltages mentioned there.
d:-)
RE: WP34 resets when using Y^X - Randy - 03-01-2014 12:13 AM
I will admit that I measured my batteries with a high-z meter, about 10^10 Ohms. So, they are probably lower voltage under load.
Strange, that I could not cause a reset with anything other than Y^X. I know Pauli said this function is compute heavy but I'm surprised it would reset even with a 2 in both X and Y. It just happens very fast.
Moral to the story, keep spares on hand.
Randy
RE: WP34 resets when using Y^X - Paul Dale - 03-01-2014 12:54 AM
Logarithms might do it -- try log y to base x. The zeta function is usually a sure fire battery stresser.
Setting SLOW mode is often beneficial for the batteries.
- Pauli
RE: WP34 resets when using Y^X - Marcus von Cube - 03-02-2014 02:50 PM
You should measure the voltage under load. A short loop with BATT (and no PSE) will force the calculator to run at full speed and thus BATT should report the voltage under load. Give it some time (a few seconds) before you stop the loop with R/S. The reason is the adaptive approach of the battery level detecting algorithm. The processor just features a brown out detector.