CyFlow
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Space | Operating Manual | March 2021
29
9.1.4 Threshold: Lower Level (L-L)
Adjustment of Lower Level L-L
Setting a proper lower level (L-L) avoids the acquisition of small and unwanted
background or "noise" signals below a threshold.
The L-L value of a parameter can be increased (decreased) by clicking into the
corresponding L-L value field in the instrument settings box and using the Right
(Left) buttons, please see chapter 9 Instrument Settings, Figure 7.
Start with a low L-L (e.g. 10). Increase the L-L until no more of the small "noise"
signals appear in the histograms. Make sure not to remove signals from particles of
interest by a L-L being too high.
A L-L range of 0…999.9 corresponds to the full histogram scale, independent of the channel
resolution actually selected.
If a leading trigger is selected, then the L-L can only be effectively set on this trigger
parameter.
NOTICE
L-L and U-L cannot be adjusted after the acquisition.
After acquisition, you may use 1P ranges or 2P polygons to gate out
undesired signals instead.
L-L values do not directly correlate with axis values.
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