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RE: Quick HP question

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Title: Quick HP question

Ah, another HP 15C diehard.  These old things just keep going . . . and going . . . . and going.  Best investment I ever made in engineering tools, 22 years ago.


I think the ‘C’ means you are in Celsius mode instead of Fahrenheit.


Okay, just kidding.


Here is what my manual says.  The ‘C’ is for Complex mode.  When in complex mode all trigonometric functions are done in radians.  So just convert your degrees to radians!





Hey, I’m just having a little fun on a boring Thursday, nothing personal.  I guess you would like to know how to turn it off.  Here’s what the manual states: “To deactivate complex mode clear flag 8 (keystroke sequence g>CF>8).  The C annunciator will disappear”.


What I like best about my HP15C is that when the “low battery” symbol lights up, I still have about 1-1.5 years of battery life left.






From: Gary Ehrlich [mailto:GEhrlich(--nospam--at)]
Sent: Thursday, January 19, 2006 7:58 AM
To: seaint(--nospam--at)
Subject: Quick HP question


Normally I’d just RTFM, but TFM is at home and I’m at work…

Anyway, I’ve got my HP 15C stuck in the mode where there’s a small “c” in the lower right corner of the display.  Anyone out there remember how I clear that?

I forget exactly what mode that is, I just know it’s screwing up my sin/cos/tan functions.



Gary J. Ehrlich, PE

Meyer Consulting Engineers Corp.

451 Hungerford Drive, #113

Rockville, MD  20850

(301) 738-5690 phone

(301) 738-5695 fax