Boltek Lightning/2000 - Manual (Page 225)

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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window. Either of these are sure signs that there is a
hardware problem.
If you suspect you have a problem with electrical noise, rather
than a problem with the lightning detection hardware itself,
move the antenna slightly from its normal due north
orientation. If the pattern of strokes in the Raw Lightning
Data window rotates as you rotate the antenna, it is likely that
the source of the problem is outside the lightning detection
hardware.