Boltek Lightning/2000 - Manual (Page 104)

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must occur if the -CG stroke rate is 100 strokes per
minute. The percentage change that is needed for
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 -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.