User manual

407780A‐EU‐ENv1.34/14
18
Calibration:
Acousticalcalibrator(Extech407744orequivalent)
Calibrationcheckfrequencyis1000Hz.
Nominalcalibrationlevelforthefr eefield: 94.1dB
Nominalcalibrationlevelforthedi ffus efield:94.0 dB
Frequencyforacoustictesting: 8000Hz
Warm‐up time: ≤2min
Samplinginterval: Bargraphindication

125msapprox.
Numericindication

1secapprox.
Datarecordcapacity: Datacanbestoredinmemory.
Max.32000readingscanbestored
Max.255blocks
LCDDisplay
Displayscreens:
4digitnumeric alindicationofsoundlevel,fro m30.0to130.0dBwith0.1dBresolution.
Bar‐gr aphindicationofcurrentsoundlevelwith1dBresolution.
Soundlevelrange
indicator:30–90dB,40–100dB,50–110dB,60–120dBor 70–130dBinfive
ranges.
Timedisplay ;year–mon th–dayandhour:minute: second.
Displayupdaterate:1second
Display’sstart‐upindication:Dependsontheconditionofmeterwhenitwaslastswitchedoff.
Warningindications:
Out‐of‐rangeindications:
OVERdisplayed
atupperlimitoftherange
UNDERdisplayedatlowerlimitoftherange

Outputs
ACoutput(usingselectedfrequencyweighting)
Outputvoltage: 2Vrms(atfull‐scaleoftherange)
Outputimpedance: 5kΩ
Loadimpedance: ≥1MΩ
DCoutput
Outputvoltage: 10mV/dB
Outputimpedance: 5kΩ
Loadimpedance: ≥1MΩ
I/Oconnector: Soundlevelmetercontrol fr om,anddataout putto,PC(USB)
Alarmoutput: 5Vdc,typical