Run Mode
The same as the pause mode except the data necessary to compute Lavg,
Leq, DOSE, TWA, SEL, PEAK, MAX, RUN TIME, and OVERLOAD is
accumulated.
Compute Mode
If a key has been pressed with the unit in the pause or run modes, the
MICRO-15 will compute and display the desired function. If the key is held down
it will recompute it each second using the data accumulated during the preceding
second. If the data will not compute (as an example, Lavg will not compute if the
sound level never exceeds the threshold level) the display will show four dashes.
If the print key has been pressed the processor will compute one line of print
every other second and send the data to the printer output. The printer output
may be terminated by pressing the ON/OFF key for one second. The computer
continues to accumulate data during a printout. For best results the computer
should be placed in the pause mode during a printout.
When computing is completed the processor returns to the wait mode.
Stop Mode
If the ON/OFF key has been depressed for 5 seconds, the MICRO-15 enters
the stop mode. In the stop mode the processor stops accumulating, but does not
erase data. Power is removed from the analog circuitry, and the display circuitry.
The 32,768 Hz oscillator is stopped as is the processor's oscillator. Only a few
microamps of current is drawn from the battery to maintain the microcomputer's
memory and to power the ON/OFF key.
When the ON/OFF key is then pressed the computer returns to where it was
before it was turned off except it will be in the pause mode.
Formulas and Definitions
The MICRO-15 uses the following formulas to calculate the accumulated
data:
Where:
LS = Sound level in dB with SLOW time constant if the sound
level is greater than the threshold level and is -∞ if the level is less than
the threshold level.
L3 = Sound level in dB without SLOW time constant.
TC = Criterion time in seconds or 28800 seconds.
RTIME = Run time in seconds.
ER = Exchange rate in dB.
CRIT = Criterion level in dB.
HTL = High threshold level.
LTL = Low threshold level.
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