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2.4 Memory Capacity
The number of events possible is limited by the available memory. Data stored during events also fills memory, so the
length of each event is a factor in determining the total number possible, with longer events using more memory. Data is logged
at a set rate of once every minute. Run time without logging data is limited to 145 hours and 38 minutes. The Q300 will
automatically PAUSE and display " AOL " if this limit is reached. Without logging, a maximum of 300 events is possible.
Maximum logging time is 52 hours.
The dosimeter will log the following items:
3 LAVGs, 2 LMAXs, 1 Unweighted PEAK
In addition the total amount of energy accumulated during a study is limited. If this limit is reached the Q300 will
PAUSE and display " AOL ". This is dependent upon the range setting and how high the SPLs are during the study. This can
be determined from the value of SEL at various exchange rates as follows:
Exchange Rate
Maximum SEL Without Overflow
3 dB
129 dB + Range
4 dB
172 dB + Range
5 dB
215 dB + Range
6 dB
258 dB + Range
For example, with an exchange rate of 3dB on the 70 - 140 dB range, the maximum SEL without overflow would be 129 dB + 70
dB = 199dB.
2.5 RESET - Erasing Stored Data
To erase the data in memory, the Q-300 must be in the PAUSE mode. Press the MENU/ON/OFF key until " rES5 " is
displayed. Press and hold the ENTER key for five seconds. The display will count down from " rES5 " to " rES1 ". After five
seconds the data memory will be cleared, the display will briefly show " ---- ", and " on " will be displayed.
2.6 Overload Detection
While viewing SPL the overload indicator (OL) is displayed whenever the incoming signal saturates (overloads) the
circuitry. If an OL condition occurs while in the RUN mode, the OL indicator will light and remain on for the duration of the study.
If an overload ocurred, it will be indicated on the hard copy printout. While reviewing an event in memory, the OL
indicator will remain on if an overload occurred during that study.
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2.7 Security
The Security feature allows you to lock out another person's access to certain dosimeter functions. There are two
security modes, which appear in the Setup Menu as SE1x and SE2x.
SE1
enabled (SE11 in the setup menu display) secures the units controls while it is in the RUN mode. To
unlock the dosimeter, a four digit security code must be entered.
SE2
enabled (SE21 in the setup menu display) prevents changing any Setup Menu items (except SE1). To
unlock the setup a four digit security code must be entered.
SE10 or SE20 in the display indicates that either security function is disabled. To enable either security feature, press
the following keys:
" On " shown in display
Down Arrow 2 (or 3) times
to SE10 (or SE20) in display
SET indicator ON
Up or Down Arrow to change
SE10 to SE11 in display
"0---" in display
4x;
ª
«
to set, and ENTER
to enter four digits
Returns to SE11 (or SE21) display