GROUND MICROPHONES : GMA205
Ground Microphone Systems are available in a basic analogue and a high end digital range. In the higher end systems selectable filters and time of flight measurements are standard features.
PRINCIPLES OF OPERATION
The GMA205 Seismophone was originally developed to cater for the needs of cable fault location technicians where simplicity of use and high accuracy is of utmost importance in noisy environments.
The instrument is equipped with a sharp cutoff noise cancelling filter, which greatly simplifies the acoustic pinpoint location of faults. It is also equipped with a number of other user-friendly features to simplify the procedure.
Display of information is done in analog meter fashion.
The instrument embodies the very latest Analog Electronic techniques. The acoustic amplifier employs high class analog filters to filter as much noise as possible before the signal is amplified. The magnetic amplifier is gain adjustable which allows the operator to attenuate the magnetic signal and then pinpoint exactly where the cable is.