Extech Instruments 407780A - Page 17

407780A‐EU‐ENv1.34/14
17
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RANGE:60–120dB.Teststartingpoint94dBforallweightingsandfrequenciesexcept31.5Hz
A‐weighted,forwhichthestartingpointis74dB.

FREQUENCY
Hz
WEIGHTING
L.O.R.
dB
WEIGHTING
L.O.R.
dB
31.5 A 60.0–80.6 C 60.0–117.0
1000 A 60.0–120.0 C 60.0–120.0
4000 A 60.0–120.0 C 60.0–119.2
8000 A 60.0–118.9 C 60.0–117.0


RANGE:70–130dB.Teststartingpoint104dBforallweightingsandfrequenciesexcept31.5Hz
A‐weighted,forwhichthestartingpointis84dB.

FREQUENCY
Hz
WEIGHTING
L.O.R.
dB
WEIGHTING
L.O.R.
dB
31.5 A  70.0–90.6 C 70.0–127.0
1000 A 70.0–130.0 C 70.0–130.0
4000 A 70.0–130.0 C 70.0–129.2
8000 A 70.0–128.9 C 70.0–127.0

Frequencyrange: Overallcharacteristicsincludingmicrophone:31.5to8000Hz
Frequencyweighting: A,meetstherequirementofIEC61672‐1forclass2Aweighting.
C,meetstherequirementofIEC61672‐1forclass2Cweighting.
Timeweighting(RMSdetection): Fast,accordingtoIEC61672‐1class2.
Slow,
accordingtoIEC61672‐1class2.
Impulse,accordingtoIEC61672‐1class2.
Referenceconditions:
Typeoftheacousticfield: Free
Referencesoundpressurelevel: 94.0dB(relatedto20

Pa)
Referencelevelrange:  60to120dB
Referencefrequency:  1000Hz
Referencetemperature:  +23
o
C(73.4
o
F)
Referencerelativehumidity: 50%RH
Referencestaticpressure: 101.325kPa
Referenceincidencedirection: Perpendiculartothefrontofthemicrophonediaphragm.
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