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General Overview
2. GENERAL OVERVIEW
2.1 The Display:
The LCD display provides a numeric readout in 0.1dB increments
along with a LOBAT (low battery) indicator. The LOBAT indicator
will turn on when the voltage of the battery is too low to allow an
accurate reading.
A plus sign '+' will appear on the left side of the display if signal
peaks cause an overload condition in the electronics. If the signal falls
below the measuring range, 'UR' (under range) will be displayed.
2.2 Meter Controls:
2.2.1 OFF/PAUSE/RUN Switch:
• OFF - In this position the power is removed from the instrument.
• PAUSE - In SPL mode the meter continuously displays sound pres-
sure level according to the RESPONSE and WEIGHTING settings. In
other modes the meter will display the appropriate value for the previ-
ous RUN or '---' if no run time has been accumulated. The meter
automatically updates the current reading at a rate of once per second.
• RUN - Causes the meter to begin calculating the frequency
weighted equivalent continuous SPL. All SPL measurements are inte-
grated into a single number representing the equivalent SPL for the
entire measurement period. This measurement will continue until the
meter is placed in the PAUSE mode or reset. Maximum RUN time is
100 hours or as long as the battery lasts.
2.2.2 SPL/LEQ/RT/MAX/MIN/%OL Response Switch:
This six position switch determines the display mode of the meter.
• SPL - In the SPL mode the numeric display provides a reading of
the maximum sound pressure level measured during the previous
second.
• LEQ - In the LEQ mode, the display indicates the integrated , or
average level for the RUN period. If no RUN time has been accumu-
lated the display shows dashes.
3
1200/2200 Sound Level Meter Operator's Manual
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