HWM DXmic User Manual page 16

To clarify the leak noise, background or unwanted noise frequencies can be filtered out using a
combination of the controls on the DXmic. Unwanted frequencies can be filtered out via the
bandpass, bandwidth and filter position buttons.
There are two modes of operation – survey mode and minimum level profiling mode (MLP)
In survey mode, the gain level can be adjusted for optimum volume and the filters can be
adjusted to reduce unwanted ambient noise. To locate the position of an underground leak the
microphone is placed on the ground above the line of the suspect pipe and the readings
observed.
All filter settings are located along the bottom edge of the main display screen.
Survey Mode Screens
Unfiltered Noise
This is the initial default screen, which
appears when the DXmic is switched on.
This screen shows when no filters are applied.
The frequency spectrum indicator bar
shows that all frequencies are
available.
Filter Selection
Survey Mode
Unfiltered noise reset button.
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