Applying formula to two columns of data

Hi,
I've started to use DIAdem and it appears very powerful. Comparision between different data channels
is straightforward and the built in functions are useful. What I'm comparing with with the older way I
analysed data within EXCEL. To deduce INL and DNL from raw data of a DAC. See attached how the
formula has been applied to some dummy data I made up of a 3 bit DAC! Anyhow I'm wondering if there
is a correspondingly easy way to implement this formula in DIAdem. Any help appreciated. I'm played
around with the calculator a little but to no avail.
Thanks,
Mike
Attachments:
INL+DNL results.xlsx ‏14 KB

Michael,
I took your Excel file and tried to recreate the exact same thing in DIAdem 2010.
Here's what I did:
The Excel function that subtracts values within a column from each other can be replaced by the "Calculate Differences" function in DIAdem ANALYSIS (ANALYSIS > Basic Mathematics > Calculate Differences). That creates a new Channel I called "Delta" in my DIAdem Data Portal.
The next thing I did was add the LSB value as a property to a data channel (in my case I added it to "Readings" as a custom property).
The next step was to go to ANALYSIS and select the Calculation Manager from the toolbar. I added two calculations to the calculation manager, one for DNL and one for INL.
And here is the INL calculation:
That's what got me the same results you have in Excel ...
Ask if you have further questions,
Otmar
Otmar D. Foehner
Business Development Manager
DIAdem and Test Data Management
National Instruments
Austin, TX - USA
"For an optimist the glass is half full, for a pessimist it's half empty, and for an engineer is twice bigger than necessary."

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