(25) THD(%)

[C.Ret]

hI?

I get in trouble decyphering the original HP-25 since a fraction of it is masked at the page's boundary !

At least, I figure out what I have made wrong. I was recalling the \( \sum{x} \) instead the the correct \( \sum{x^2}\) register.

Here is a conversion of the code for HP-15C:

Code:

001-42.21.11   f LBL A
002-      16     CHS
003-       2      2
004-       0      0
005-      10      ÷       //  Divide not add here
006-      13     10^x
007-      49      ∑+
008-    45 4     RCL 4    //  R4 is ∑x²   (I was wrong here using R3 which ∑x)
009-      11      √x
010-      26     EEX
011-       2      2
012-      20      ×
013-   43 32   g RTN

To start a new computation, don't forget to press f CLEAR ∑ g RTN
To enter the values in dB you may press R/S or f A as you prefer.