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Sparker pulses are released through manual
or automatic triggering of the impulse generator (IPG5000) controlled by the
remote control unit (RCU). e RCU converts the reference signal of the impulse
generator to an accurate time break with an accuracy of a few microseconds.
To estimate the source repeatability the
calculation of the coherency spectra is used. Coherency values of „1“ indicate
perfect repeatability whereas a coherency of „0“ expresses no repeatability. e
test shows that the P-wave sparker source SBS42 is highly repeatable up to
frequencies of 4-5 kHz.
