Extech Instruments 407780A - Page 16

407780A‐EU‐ENv1.34/14
16

Self‐generatednoiselevel:
Typicalvaluesat23
o
C(73.4
o
F), usingthenominalmicrophoneequiva lentcapacitanceof27pF 
(30‐90dBrange)
Weighting Electrical Total
A 22.7dB 26.1dB
C 21.8dB 29.5dB
Linearityoperatingrange: A‐weighted,1000Hz,60dBdynamicrange.
Totallinearoperatingrange: InaccordancewithIEC61672‐1,A‐weighted,1000Hz:30dBto
130dB.
Levelrangeselection: 5rangesin10dBsteps30to90dB,40to100dB,50to110dB,
60to120dB,70to130dB
Linear
OperatingRanges(L.O.R.)

RANGE:30–90dB.Teststartingpoint64dBforallweightingsandfrequenciesexcept31.5HzA‐
weighted,forwhichthestartingpointis44dB.

FREQUENCY
Hz
WEIGHTING
L.O.R.
dB
WEIGHTING
L.O.R.
dB
31.5 A 36.1–50.6 C 39.5–87.0
1000 A 36.1–90.0 C 39.5–90.0
4000 A 36.1–90.0 C 39.5–89.2
8000 A 36.1–88.9 C 39.5–87.0

RANGE:40–100dB.Teststartingpoint74dBforallweightingsandfrequenciesexcept31.5Hz
A‐weighted,forwhichthestartingpointis54dB.

FREQUENCY
Hz
WEIGHTING
L.O.R.
dB
WEIGHTING
L.O.R
dB
31.5 A 40.0–60.6 C 40.0–97.0
1000 A 40.0–100.0 C 40.0–100.0
4000 A 40.0–100.0 C 40.0–99.2
8000 A 40.0–98.9 C 40.0–97.0

RANGE:50–110dB.Teststartingpoint84dBforallweightingsandfrequenciesexcept31.5Hz
A‐weighted,forwhichthestartingpointis64dB.

FREQUENCY
Hz
WEIGHTING
L.O.R
dB
WEIGHTING
L.O.R
dB
31.5 A 50.0–70.6 C 50.0–107.0
1000 A 50.0–110.0 C 50.0–110.0
4000 A 50.0–110.0 C 50.0–109.2
8000 A 50.0–108.9 C 50.0–107.0

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