Extech Instruments 407780A User Manual page 16

Self‐generated noise level:
Typical values at 23
(30‐90dB range)
Linearity operating range:
Total linear operating range:
Level range selection:
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
31.5
1000
4000
8000
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
31.5
1000
4000
8000
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
31.5
1000
4000
8000
800.561.8187
o o
C (73.4 F), using the nominal microphone equivalent capacitance of 27pF
Weighting
A
C
A‐weighted, 1000Hz, 60dB dynamic range.
In accordance with IEC 61672‐1, A‐weighted, 1000Hz: 30dB to
130dB.
5 ranges in 10dB steps 30 to 90dB , 40 to 100dB, 50 to 110dB ,
60 to 120dB, 70 to 130dB
WEIGHTING
A
A
A
A
WEIGHTING
A
A
A
A
WEIGHTING
A
A
A
A
www.
Electrical
22.7dB
21.8dB
L.O.R.
WEIGHTING
dB
36.1 – 50.6
36.1– 90.0
36.1 – 90.0
36.1 – 88.9
L.O.R.
WEIGHTING
dB
40.0 – 60.6
40.0 – 100.0
40.0 – 100.0
40.0 – 98.9
L.O.R
WEIGHTING
dB
50.0 – 70.6
50.0 – 110.0
50.0 – 110.0
50.0 – 108.9
16
.com
Total
26.1dB
29.5dB
L.O.R.
dB
C 39.5 – 87.0
C 39.5 – 90.0
C 39.5 – 89.2
C 39.5 – 87.0
L.O.R
dB
C 40.0 – 97.0
C 40.0 – 100.0
C 40.0 – 99.2
C 40.0 – 97.0
L.O.R
dB
C 50.0 – 107.0
C 50.0 – 110.0
C 50.0 – 109.2
C 50.0 – 107.0
407780A‐EU‐EN v1.3 4/14
information@itm.com