PCE Health and Fitness PCE-LDC 8, Руководство пользователя

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6. Operation
Please make sure that all components listed below are included in your
package.
Qty Description
1 PCE-LDC 8 leak detector
1 Sensor unit
1 noise isolated
headphones
1 focus tube incl. focus tip
1 Cable from instrument to
sound probe
1 Battery charger
1 Transport case
1 user manual
Remark
•
The sensor unit can be unplugged from the main instrument by
pulling the unit out of the holder. A separate coiled extension cable
is used to connect the sensor to the main unit.
6.1 Operating Principle
Air leaks produce wide-band ultrasounds in the range of 20... 80 kHz.
The higher the frequency the more energy it contains. But higher
frequencies cannot be transported in air that far. That is why the leak
detector operates at a centre frequency of 40 kHz which compromises
an optimum between energy and distance. Frequencies below and
above are cut in order to minimize the noise level.