Boltek Lightning/2000 - Manual (Page 103)

R E A L - T I M E L I G H T N I N G D E T E C T I O N
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At 1000 strokes per minute, the percentage change
required for an alert is one-half the value specified as
the trigger level. At 10 strokes per minute, the
percentage change required is twice the specified
trigger level.
When Lightning/2000 is in flash mode, this counter
shows the change in the +CG flash rate.
At least 10 +CG strokes per minute, both currently
and one minute ago, must occur for the yellow or red
alert to be triggered.
Negative CG Stroke Rate Change
Counter
The –CG stroke rate change counter, shown with and without an alert bar.
Default yellow alert trigger level: 25
Default red alert trigger level: 50
Record kept: No
This counter shows the percentage change in the -CG
(negative cloud-to-ground) stroke rate between one
minute ago and now.
If the stroke rate one minute ago was zero, and the
current stroke rate is zero, "--" is displayed. If the
stroke rate one minute ago was zero, and the current
stroke rate is non-zero, "*" is displayed.
A sudden change in the -CG stroke rate may signal a
change in the character of a storm and could indicate
behavior that needs to be monitored.
When you specify a trigger level for the red or yellow
alert, you are specifying the percentage change that