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2.3 Magnetic and acoustic sensors
Several sensors are available for reception of magnetic and acoustic signals which are used
depending on selected tracing and measuring method.
BM 30
The highest sensitivity of the ground microphone is at
the range of 200Hz. Therefore, it is most suitable for
pin-pointing of flashover faults according to the Surge
Voltage method. Its special decoupled housing
suppresses possible ambient noises.
Included into the BM 30 is a magnetic sensor to
enable the propagation time measurement and a
tracing of cable line while pin pointing.
KH 30
The headphone KH 30 is connected to the Audio
Frequency Receiver via a 3-pin jack plug (6.3mm).
For suppressing ambient noises the type KH20/S
headphone is used.
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