14
1. On the Filter Selection screen, a horizontal bar will be displayed
beneath the selected filter or filters (Figure 12).
2. When the unit is placed in normal Listening Mode (the Main
Screen), Memory, or Continuous Listening Modes, the HL 5000
will
focus on measuring the constant, minimum leak sound levels of only
the frequencies selected by the user on the Filter Selection screen.
Unwanted sounds of interference, such as the hum of power lines, for
example, can be minimized or completely eliminated by not selecting
the filter (in this case, the 0-70 Hz filter) associated with the sound.
3. The selected filters/frequency range will be displayed in the upper
right-hand corner of the Main Screen.
Sound activity on all the filters will continue to be visible on the Filter
Selection screen (allowing the user to decide when it is appropriate to
change the filter settings), but only sounds generated by the selected
frequencies (filters) will by measured by the HL 5000
when the unit
is in other modes of operation.
Filters are selected or de-selected by using the lower (Fig.13) and
upper (Fig. 14) cut-off soft keys found underneath of and to the right of
the individual frequency bars, respectively.
When selecting or de-selecting filters using the lower cut-off,
the user will automatically begin with the lowest selected filter. By
pressing either the left- or right-arrow soft keys, the user will be able to
add or remove filters to those already selected.
When selecting or de-selecting filters using the upper cut-off,
the user will automatically begin with the highest selected filter.
By pressing either the left- or right-arrow soft keys, the user will be
able to add or remove filters to those already selected.
