11
The AVG function key selects the group of items LAVG, TWA or SEL for display. The
ª
and
«
keys are used to
select the specific item. Pressing AVG again selects the next dosimeter's (I, II or III) averages to be displayed. If two
or more dosimeters have identical measurement parameters, the higher number dosimeter will not be displayed.
LAVG - The average level over the study. This measurement takes into account the threshold and exchange rate
entered in the setup menu.
TWA - Time Weighted Average. The average level accumulated during a study, but calculated with an eight hour
integration time.
SEL - The Sound Exposure Level is the constant sound level which, if lasting for one second, would deliver the same
amount of acoustical energy as that accumulated over the entire study.
The TIMES function key selects the group of items RT, PT or UL (Run Time, Pause Time or Upper Limit Time) for
display. The
ª
and
«
keys are used to select the specific item, with a minutes:seconds display and an hours display
available for each item. Pressing TIMES again selects the next dosimeter's (I, II or III) times to be displayed, where
UL time may differ. If two or more dosimeters have identical measurement parameters, the higher number dosimeter
will not be displayed.
RT -
The total RUN time will be displayed. Time may be displayed in MIN:SEC and xx:HRS. The MIN:SEC display
for a study that lasts over one hour will wrap around to 00:00. The xx:HRS display will count to 99:Hr and then
wrap around to 00:00 but the actual time will be stored in memory.
PT -
Total PAUSE time since the last time the unit was reset. Pause time is displayed in the same manner as Run
time.
UL -
Upper Limit Time, or the time that the SPL exceeded the Upper Limit Level set for that dosimeter in the setup
menu.
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2.3 Acoustic Event Options
The Q-300 presents measurement data as follows. Each time that the unit is Run and Paused creates an
Event
, which
is a set of measurements performed over a user defined period of time, referred to as the
Run Time
. The event begins at the
Start Time
and ends at the
Stop Time
. Each event is stored in internal memory, with its own data referred to as the
Event
Summary
. The
Overall Summary
is the result of all measurements taken since the last RESET. The time between events is
recorded as
Pause Time
. The Current Event is indicated in the Setup Menu display as " Cxxx " where xxx is the event number.
This is the event initiated the last time the Q300 was placed in RUN.
An event may be initiated and ended in the following ways:
Manual Event - Press RUN/PAUSE to begin an event, causing the RUN indicator to light. Press RUN/PAUSE again to end the
event, causing the PAUSE indicator to light.
Manual Timed Event - Press RUN/PAUSE to begin an event. If a
Programmed Run Time duration has been set, the event will run for this time duration and
automatically stop. The event may be interrupted by pressing the PAUSE key.
Auto Timed Event - An Auto ON time and date must be set and
enabled in the setup menu and the Q-300 must be turned OFF. When the internal clock/calendar
reaches this time and date, the meter will turn on, warm up for 10 seconds and begin an event. The
duration of the event will be that of the Programmed Run Time stored via the setup menu. At the end
of the event, the unit will PAUSE and turn itself OFF. The event may be interrupted by depressing the
PAUSE key.
Data viewed on the display is normally the Overall Summary Data. SPL is active only while viewing the current event.
In the EVENT portion of the Setup Menu, it is possible to view the data from the current event as it happens, or from previous
events while still in RUN mode. The RUN/PAUSE key may be used to start and stop events while in the EVENT portion of the
Setup Menu. Each time an event is started, the number of that event will briefly appear in the display. Refer to Section 3, Setup
Menu.