Boltek Lightning/2000 - Manual (Page 88)

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IC Percent Counter
No alarm is associated with the IC percent counter.
Record kept: No
The IC percent counter shows the percentage of IC
(intercloud/intracloud) strokes compared to the total
number of strokes in the last minute. CID (compact
intercloud discharge) strokes are included as IC
strokes.
For example, if the stroke rate is 200 and the IC
stroke rate is 50, this counter would indicate “25%”.
IC strokes are more commonly detected from
relatively nearby storms (within 250 km or 150 miles).
As a storm approaches, the percentage of IC strokes
will typically rise. However, it depends a lot on the
nature of the storm. For this reason, there is no
longer an alarm associated with the IC percent
counter.
When running Lightning/2000 in flash mode, this
counter shows the percentage of IC flashes, rather
than strokes.
At least 10 strokes per minute must occur before the
red or yellow alert is triggered.
This counter is not used with the LD-250.
Positive IC Percent Counter
The +IC percent counter has no alarms associated with it.