How do you calibrate NMR chart?

[skyisblue]

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I know that NMR charts are calibrated using an arbitrary scale called the delta scale, where 1 delta = 1ppm of the spectrometer operating frequency.

I don't quite get this formula:

delta = observed chemical shift (number of Hz away from TMS) / Spectrometer frequency in MHz

With this formula, you get the spot where the absorption is on the NMR chart? AND the observed chemical shift is what one sees when operating an NMR spectrometer?

This goes back to my other question on how an NMR spectrometer actually works conceptually.....