Larson Davis 824 Technical Reference Manual

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Larson Davis 824 Technical Reference Manual Manual pdf 326 page image

9-14 824 Reference Manual 9/29/09Overload and Under Range ConditionsOverload ConditionWhen the input signal is too high, the electronics willoverload. This is indicated by a flashing OVLD textmessage, as well as a flashing OL (for overload) in the upperright corner of the display as shown below.This text message will continue as long as the overloadconditions continues, but it will disappear when the inputlevel drops below the overload level. However, the flashingOL display will continue to appear in the same position asshown below. This indicates that the data measured may notbe accurate due to the overloaded condition which occurredduring the measurement interval.Reset Press the R key to reset the measurement. This function isdescribed in greater detail in the section ”R Reset Key” onpage 3-9. The reset facility clears an overload indication andthere is no delay time between the operation of the resetfacility and the re-initiation of a measurement.Under Range ConditionNOTE: The noise level corresponding tothe microphone being used must havebeen entered by the user, as described insection ”Entering the Noise FloorValues” on page 9-4, in order for thisfeature to function correctly.When the sound level being measured is within 10 dB of thenoise floor, this will be indicated by a flashing downward