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HP Forum Archive 17

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HP48GX units problem
Message #1 Posted by Nol Cotter on 1 Aug 2007, 8:14 a.m.

If on my HP48GX I do the following:

1000 Hz 1E-6 F * INV

I get 1000_

Where as the correct answer is:

(0,-159.154943092)_

First, its obvious the calculator has not made the conversion from Hz to radians/sec.

Next, if I type:

(0,2)

I get an error message Bad Argument Type so apparently the units cannot be appended to a complex number. But 1 / (1 Hz * 1 F) does NOT equal 1 even if we neglect signs or complex numbers.

      
Re: HP48GX units problem
Message #2 Posted by bill platt on 1 Aug 2007, 9:49 a.m.,
in response to message #1 by Nol Cotter

This might be worth a search through archives of comp.sys.hp48

      
Re: HP48GX units problem
Message #3 Posted by Nol Cotter on 1 Aug 2007, 5:36 p.m.,
in response to message #1 by Nol Cotter

I see that the text was garbled when I posted it. I'll try editing it in and see if it will make more sense.

If on my HP48GX I do the following:

1000

Hz

1E-6

F

*

INV

I get:

1000_Ohm

(Ohm symbol does not post correctly)

Where as the correct answer is:

(0,-159.154943092)_Ohm

First, it's obvious the calculator has not made the conversion from Hz to radians/sec.

Next, if I type:

0,2)

Ohm

I get an error message, "Bad Argument Type", so apparently the units cannot be appended to a complex number. But 1 / (1 Hz * 1 F) does NOT equal 1 Ohm even if we neglect signs or complex numbers.

There, that makes a little more sense.

Edited: 1 Aug 2007, 5:41 p.m.


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