Boltek Lightning/2000 - Manual (Page 98)

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alert status at higher stroke rates is somewhat lower,
and the percentage change that is needed for alert
status at lower stroke rates is higher.
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 IC flash rate.
At least 10 IC strokes per minute, both currently and
one minute ago, must occur for the yellow or red alert
to be triggered.
This counter is not used with the LD-250.
Positive IC Stroke Rate Change Counter
The +IC 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 +IC
positive intercloud/intracloud) 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.