Convert string to number

[DavidCoombs]

Hi
Have a vi controlling a Keithley 236. It returns a string as a measurement value. I need to do some arithmetic on this and other values. I Can't do this when its a string but when I convert to a number I get a duff conversion.
Any ideas?

[altenbach]

I don't know the definition of "duff conversion" ;). How do you convert?

Please show is how the string looks like and what you want as a result (DBL, U16, etc..).

[tbob]

What does the string look like? Is it a floating point number, like 1.23, or an exponential, like 10.4e3? If so, use the Fract/Exp String to Number conversion found in the strings palette. If the string contains other characters, you must take a subset of just the numerical expression. If the string is a hex representation of bytes, use the Type Cast function found in Advanced - Data Manipulation.

[Dennis_Knutson]

Besides the other comments, there's a driver available for this instrument that already has all of the string to number conversions. You can download it here. It's a pretty old driver (matches the age of the instrument, I guess) but it would provide a good starting point if you feel that you need to create your own.

[DavidCoombs]

Thanks a lot guys, I'm going to try all this stuff this morning!

Cheers

[LV_Pro]

But what is a "duff"?


P.M.

[shoneill]

A "duff" conversion is a conversion which doesn't work.

A "duff" beer (in this sense, not in Springfield ;)) is a really bad beer.

A "duff" anything is a general expression of negativity over the current state of being.

As far as I know.

Hope this helps

Shane.

[Ray.R]

Yikes..

I've been "DUFFed"!!

😄

Thanks Shane for explanation (and examples).

[GerdW]

Hello David,

maybe you have to change the initialization of your Keithley 236. They have some output options (with or without unit/status/etc). Use the output options with just the number, then the conversion should be no problem...