Extech Instruments 407780A User Manual page 9

Press the ► ǁ button to start the measurement, the ►symbol and the elapsed
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measurement time is displayed.
 When the measurement time has elapsed, the measurement automatically terminates
and the  symbol is displayed.
 During measurements, the ► ǁ button can be used to pause and resume a test.
 During pause, the pause symbol ǁ is displayed.
 To terminate the measurement, press and hold the ► ǁ button for 2 seconds.
 If an under or over range condition occurs at least once during measurement, the OVER
or UNDER indicator appears to indicate that the recorded data contains over‐range or
under‐range data.
 During this procedure most of the buttons, such as the A/C button and level range
buttons, are inoperative. Only the ► ǁ button and the Leq SEL SPL buttons can be used.
All other settings must be made before starting the measurement.
 Pause intervals are not included in the measurement time.
7. When the measurement is completed, paused or in progress, press the Leq SEL SPL button
to cycle through and display the following measurement results.
Leq : Equivalent continuous sound level with start measurement time.
SEL : Sound exposure level with terminate measurement time.
SPL MAX : Maximum sound level with time.
SPL MIN : Minimum sound level with time.
PH : Peak Hold sound level
L:055% percentile sound level
L:1010% percentile sound level
L:5050% percentile sound level
L:9090% percentile sound level
L:9595% percentile sound level
SPL INSTCurrent sound level with current time.
If OVER is flashing, the recorded data contains over‐range measurements.
If UNDER is flashing, the recorded data contains under‐range measurements.
Press and hold the ► ǁ button for 2 seconds to exit this measurement mode, clear the
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measured result, and to return to the normal sound level measurement mode.
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