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2.2 Keypad Functions
Pressing this key turns the meter on. After a warmup period of several seconds, the display will read " on " and the
dosimeter is ready to use. Pressing and holding this key will cause the display to read " OFF5 "and count down for
five seconds until " OFF " is displayed. After this the display will blank and you may release the key. Releasing the
key will turn the meter off. Briefly pressing and releasing this key will toggle the display between " on " and " rES5 "
(Reset), except while in RUN mode when the display will read " run ".
Pressing this key begins a study and lights the RUN indicator. Pressing again ends the study and lights the PAUSE
indicator. If the Q-300 is in the setup menu at either CAL or Prn, pressing this key will begin a calibration or start
printing, respectively.
The ENTER key is used in the setup menu to begin and end a change of a menu item's value or state. After using
the arrow keys to select a menu item, press ENTER to light the SET indicator, allowing the value to be changed with
the arrow keys. After changing, press ENTER to store the value.
The up or down arrows are used to select specific measurements within each of the function displays. For example,
after pressing LEVELS, the arrow keys may be used to select SPL, MAX, MIN or PEAK for display. The arrow keys
are also used to select items in the setup menu, or to set the values for a particular item in the setup menu.
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The LEVELS function key selects the group of items SPL, MAX, MIN or PEAK for display. The
ª
and
«
keys are
used to select the specific item. Pressing LEVELS again selects the next dosimeter's (I, II or III) levels for display. If
two or more dosimeters have identical measurement parameters, the higher number dosimeter will not be displayed.
The levels between dosimeters will only differ if the time constant selected for one dosimeter differs from that of the
other two.
SPL - Sound Pressure Level (SPL) will be displayed, with the selected weighting and response characteristics. The
value displayed is the maximum SPL during the previous second.
MAX - The Maximum SPL while in the RUN mode is displayed.
MIN - The Minimum SPL while in the RUN mode is displayed.
PEAK - The Peak Level. The output of the peak detector may be viewed as PEAK or logged. Peak values are the
maximum measured while in RUN mode, except when no RUN time has been accumulated.
The DOSE function key selects the group of items DOSE, PDOSE or EXP for display. The
ª
and
«
keys are used to
select the specific item. Pressing DOSE again selects the next dosimeter's (I, II or III) dose group to be displayed. If
two or more dosimeters have identical measurement parameters, the higher number dosimeter will not be displayed.
DOSE -
Percentage of allowable sound energy that a person may be exposed to during a work day based on
the criterion level, threshold level and exchange rate selected for the particular dosimeter.
PDOSE -
Projected dose, calculated by assuming the average sound level measured during the run time and
extrapolating to the number of hours selected in the setup menu.
EXP - Sound Exposure in Pascal-squared hours. The display will show " ---- " if the exchange rate is not 3dB.