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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.
LHIST = Level stored each minute for histogram.
LMIN = Level of histogram printout.
#MIN = Number of minutes used to compute histogram
% TIME = The statistical distribution % Time number.
% DOSE = The statistical distribution % Dose number.
STAT# = The number of 1/16 second intervals at a level.
LSTAT = The statistical distribution level.
TESTING AND CALIBRATION
Battery Test
Press any key. If the battery is low, LOB AT will be displayed in the upper left corner of the
display. If the battery has at least 8 hours life, LOBAT will be off. If LOBAT is displayed after a day's use,
but not at the start of the day, the readings are still good.
Battery Replacement
Loosen the 2 screws on the back of the unit and remove the back. Remove the battery from the
cavity and carefully unclip the battery. Replace with a new battery. Take care to observe the polarity of
battery and do not reverse the terminals. For best results use a 9 volt alkaline battery. Replace the battery in
the compartment and check the display. If it displays 3 dashes replace the back cover. If not check the
connections on the battery. The M-27 is now operating in the pause mode. Disconnecting the battery
automatically erases stored data in memory. To save data during battery change, use the BX-9 Battery
Change Adapter, see page 47.