On 10/6/2019 9:45 AM, Grant Saviers wrote:
Approximately. The meter is measuring the sampled leg against the
parallel resistance of the other two legs (if there is no other
connection). So if the reference parallel resistance is low then the
error for the measured leg is low. (but always positive)
An over-simplification, because there is mutual inductive coupling
between nearby rods. All the instruments I've seen for this purpose work
at power or audio frequency, but lightning is an RF event! IEEE data
I've seen says that the energy has a very broad peak (+/- a decade of
frequency) in the AM broadcast band. I'm sure Jim Lux can provide more
definitive data on this.
73, Jim K9YC
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