Applied Biosystems Data Explorer 4 Series User Manual page 248

Chapter 5 Examining Spectrum Data
Type of Data
High-resolution data
5
5-44 Applied Biosystems
Suggested
Method
Noise Specify the number of standard deviations of
Removal noise to remove. The software automatically
(NR) calculates the average white noise for all
frequencies across the spectrum, then
removes the specified number of standard
(Does not
deviations of noise.
affect peak
This method slightly affects peak intensity, and
resolution.)
removes peaks with a signal-to-noise ratio less
than the specified standard deviation.
In general:
If you set
Std Dev to:
1
2
3
If applying Noise Removal with a certain Std
Dev does not yield the necessary noise
removal, return to the original trace (see
"Returning to the original spectrum" on
page 5-3) and apply Noise Removal again with
a higher Std Dev setting. Applying Noise
Removal more than one time with the same
Std Dev setting does not improve noise
removal.
4. Click OK.
The trace is displayed with an RSM, NF, NR or SM
trace label.
5. To return to the original trace, see "Returning to the
original spectrum" on page 5-3.
Description
% White Noise
removed is:
68
95
99