Extech Instruments 407780A - Page 18

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freefield:94.1dB
Nominalcalibrationlevelforthediffusefield:94.0dB 
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numerical indicationof soundlevel,from30.0to130.0 dBwith0. 1dBresolution.
Bar‐graph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disp lay ;year–month–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contr olfrom,anddat aoutputto,PC(USB)
Alarmoutput: 5Vdc,typical
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