SEHT 30-10 USER MANUAL Edition 1 (2016)
Page 3
HEADSET NOISE ATTENUATION DATA
1. The noise reduction or attenuation characteristics of communication headsets must be
measured according to an accepted standard procedure if the characteristics of
different headset are to be compared in a meaningful way.
2. The Noise Reduction Rating (NRR) is provided in accordance with U.S.EPA
Regulation 40 CFR Part 211.Subpart B. The Range of Noise Reduction Rating for
Existing Hearing Protectors is approximately 0 to 30. (Higher Numbers Denote Greater
Effectiveness)
Frequency[Hz]
125
250
500
1000
2000
3000
4000
6000
8000
Attenuation [dB]
14.3
21.5
27.1
31.8
36
39.5
41.3
39.7
37.0
Standard Deviation
3.3
2.4
1.5
1.6
1.3
2.1
2.1
2.0
1.3
SPECIFICATIONS
Noise Reduction Rating (NRR):
24dB
Headphone:
Type:
Dynamic
Frequency Response:
100Hz to 8kHz
Sensitivity:
95±5dB SPL (1kHz, 1mW input per side)
Impedance:
Dynamic 150Ohms (300Ohms each, wired in parallel)
Rated Input:
30mW
Max. Input:
l00mW
(full volume on ear simulator)
Microphone and Amplifier:
Element Type:
Noise-cancelling electret
Frequency Response:
150Hz to 5kHz
Operating Voltage:
8-32VDC
(supplied by aircraft)
Matching Impedance:
150-1000 Ohms
Sensitivity:
-33±4dB
(ref: 0dB SPL=20.0uPa
at 1kHz with 10 VDC 150Ohms AC load)
General:
Operating Temp:
-20 to 70°C
Cord:
Straight cord from headset to moulded plugs, 150cm
Connections:
Earphone Plug:
PJ-055 (0.25" 6.30 phone plug)
Microphone Plug:
PJ-068 (0.206" 5.20 phone plug)
Weight:
520g
Height:
10 to 14cm with flexible microphone boom