HP Data Explorer 4 Series - Manual (Page 248)

Chapter 5 Examining Spectrum Data
5-44 Applied Biosystems
5
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.
High-resolution data Noise
Removal
(NR)
(Does not
affect peak
resolution.)
Specify the number of standard deviations of
noise to remove. The software automatically
calculates the average white noise for all
frequencies across the spectrum, then
removes the specified number of standard
deviations of noise.
This method slightly affects peak intensity, and
removes peaks with a signal-to-noise ratio less
than the specified standard deviation.
In general:
If you set % White Noise
Std Dev to: removed is:
1 68
2 95
3 99
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.
Type of Data
Suggested
Method
Description