F-6 824 Reference Manual 9/29/091 Combination of electronic and thermal noise of themicrophone at 20°C measured in a sealed cavity andvibration isolated.2 Electronic noise of the instrument with an ADP005 adaptorin place of the microphoneMaximum Sound PressureLevel:The highest sound pressure level the Larson Davis 824 isdesigned to accommodate at the level of overload is 128 dB.The peak-to-peak voltage at this level is 6.25 Vpp inputthrough the ADP005.Power Supply Voltage Range: The battery power supply voltage range for which theSystem 824 conforms to this standard is 2.3 to 4.8 volts.The System 824 will shut down if the battery is below 2.3volts when used with alkaline batteries and below 3.3 voltswhen used with NiMH batteries.Display Device The display device will display all levels over the entirelinear operating range on all ranges.Stabilization Time FollowingChanges of EnvironmentalConditions:The typical time interval needed to stabilize after changes inenvironmental conditions is as follows:• For a temperature change of 5 °C, the time is 30 minutes• For a static pressure change of 5 kPa, 15 seconds• For a humidity change of 30% (non-condensing), 30minutesElectric Field Strength Above10 V/m:The Larson Davis model 824 was not tested for fieldstrengths greater than 10 V/m.Greatest Radio FrequencyEmission Levels:NOTE: For the specification of emissionof and susceptibility to, radio frequencyfields, the System 824 is classified asgroup X sound level meter.The mode of operation of the 824 that produced the greatestradio frequency emission levels was with the 824 set to ISMmode and with an EXA010 (10' microphone extensioncable) used to connect the PRM902 to the 824. All rangeswere the same. Radio frequency emission in other modes
