Determining signal to noise ratio

Revision as of 22:25, 19 June 2008 by Evgeny Fadeev (Talk | contribs)

This manual explains how to determine S/N ratio in 1D NMR spectra. Select platform below.

Select platform: vnmr • XWINNMR

Varian vnmr

Command: dsn - display signal to noise ratio.

Transform data (use ft for simple Ft or wft for weighted FT)

Display trace to use for S/N determination

ds(<n>)

where n is number of trace to display.

Zoom onto the region of interest.

With left and right cursors define the region with no signals - only noise

Type dsn

Command: sino Define signal region, i.e. from where intensity of tallest peak will be measured

sigf1 <start of signal region>
sigf2 <end of signal region>

Define noise region, i.e. a region with no signals, just noise

noisf1 <start of noise region>
noisf2 <end of noise region>

Type sino