Appendix H: Instrument Interference - SPX SPIDAR NIC-500s Operation Manual

Appendix H: Instrument Interference

Appendix H: Instrument Interference
Immunity regulations place the onus on instrument/apparatus/device manufacturers to assure
that extraneous interference will not unduly cause an instrument/apparatus/device to stop
functioning or to function in a faulty manner.
Based on independent testing house measurements, Sensors & Software Inc. systems comply
with such regulations in Canada, USA, European Community and most other jurisdictions. GPR
devices can sense electromagnetic fields. External sources of electromagnetic fields such as
TV stations, radio stations and cell phones, can cause signals detectable by a GPR which may
degrade the quality of the data that a GPR device records and displays.
Such interference is unavoidable but sensible survey practice and operation by an experienced
GPR practitioner can minimize such problems. In some geographic areas emissions from
external sources may be so large as to preclude useful measurements. Such conditions are
readily recognized and accepted by the professional geophysical community as a fundamental
limitation of geophysical survey practice. Such interference being present in the GPR
recordings is not considered as an equipment fault or as a failure to comply with immunity
regulations.
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