Seht SH 30-60 User manual

SH 30-60
AVIATION HEADSET
USER MANUAL
Edition 4 (2018)

SEHT 30-60 USER MANUAL Edition 4
Page 2
OVERVIEW
With the SH 30-60 you will hear and feel the difference immediately by improving low
frequency noise cancellation by an additional 18-24 dB when the Active Noise Cancelling
circuitry is enabled
OUTSTANDING FEATURES
superior active noise cancelling level, average 20dB
Up to 48 hours use from one 9v alkaline battery (included)
Synthetic leather ear seals for greater comfort and noise reduction
Noise cancelling electret microphone for improved vocal clarity
Auto Power On and Off to extend battery life
5 YEAR WARRANTY
MAIN FEATURES
Active Noise Reduction Aviation Headset (ANR power: 9V battery)
Passive Noise Reduction Rating (NRR): 24dB
Active Noise Reduction Rating (NRR): 20dB
Total Noise Reduction Rating (NRR): 44 dB
An Active Noise Reduction Headset can isolate, offset and reduce repetitive and
continuous noise. In comparison with conventional headsets it can, under noisy
circumstances, provide a quieter and more comfortable experience by reducing
background noise, making it possible to improve the telecommunication quality and
clarity which results in a higher operation safety factor. The noise cancelling circuitry
reduces outside noise considerably more than a standard headset, making it more
comfortable for the user.

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HEADSET OPERATION
1. Rotate the flexible boom overhead to wear the microphone on either the right or left
side of the head.
2. Rotate the headset volume controls (on the ear shells) fully counter-clockwise to the
minimum position, before the headset plug is inserted into the aircraft or intercom.
3. With the headband resting securely on the top of the head check that the ear seal are
centred over the ears.
4. For best noise cancellation, position the microphone 0-6mm from your mouth.
5. Insert the microphone plug (PJ068) into the aircraft intercom microphone jack socket.
Insert the earphone plug (PJ055) into the aircraft intercom earphone jack socket.
6. The headset ANR circuitry is automatically switched on when the connectors are
inserted into the aircraft intercom system. The LED on the battery module will flash
approximately once every 5 seconds to indicate working and healthy battery power.
7. Rotate the headset volume knobs clockwise to a comfortable level.
BATTERY MODULE OPERATION
N.B. The battery module requires one 9 volt PP3 size alkaline battery (Supplied).
1. Hold down the battery compartment clip and pull it to open.
2. Observe correct battery polarity and identify the positive (+) and negative (-) symbols
on both the battery and the battery compartment when replacing the battery (Remove
any transit insulating material from battery terminals prior to fitting).
3. Close the battery compartment lid and push back until it clicks into place.
4. The battery is automatically disconnected when the headset plugs are removed from
the aircraft sockets.
5. There is a switch on the battery module to select MONO or STEREO.
mono/ stereo
Open: press on the clip and pull

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PLEASE NOTE
1. This headset can only work when the plug is connected with a working aircraft comms
system. The microphone supply voltage acts as a signal to turn on the ANR function.
The power of ANR function comes from the headset battery.
2. When the battery power is low, the LED indicator will flash red. This indicates
approximately 1 hour battery life remaining under normal operating conditions. Once
the battery is exhausted or removed the headset will continue to operate as a normal
passive headset until a serviceable battery is correctly fitted. The ANR function may
not operate reliably under low battery conditions.
CAUTION
1. Proper fit is critical to noise attenuation effectiveness. When wearing the headset
always push the headband down until it rests comfortably on the top of your head.
Move the ear cups slightly up or down or from side to side until you feel maximum
attenuation. The use of eyeglasses will reduce the attenuation, use thin temples on
your glasses to keep noise leakage at a minimum.
2. Use in Impulsive Noise Area: NRR is based on continuous noise and is not an
accurate indicator of the attenuation of impulsive noise such as gunfire. For maximum
protection we recommend the use of ear plugs in addition to a headset in such
environments..
3. Maintenance and Cleaning: In order for your headset to continue working properly,
always comply the following:
a. Never alter your headset.
b. If you see a defect such as splits in cups etc seek immediate replacement
or return to an approved SEHT service centre for repair.
c. Always fit SEHT approved replacement parts/accessories
4. Cleaning Instructions
a. Do not immerse in water.
b. Clean regularly with mild soap water. Sponge off head pad and ear seals,
Taking care to rinse thoroughly
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)

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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: 50Hz to 20kHz
Sensitivity: 95±5dB SPL (1kHz, 1mW input per side)
Active Noise Attenuation: Dynamic 42 Ohms: Rated Input: 30mW, Max. Input: l00mW
Speech Sound: Dynamic 300 Ohms: Rated Input: 30mW, Max. Input: l00mW
(full volume on ear simulator)
Microphone and Amplifier:
Element Type: Noise-cancelling electret
Frequency Response: 100Hz to 5kHz
Operating Voltage: 8-32VDC (supplied by aircraft)
Matching Impedance: 150-1000 Ohms
Sensitivity: -33±4d
(ref: 0dB SPL=20.0uPa at 1kHz with 10 VDC 150 Ohms 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: 600g
Noise Reduction Specifications:
Attenuation Frequency Band........................................................20Hz~20KHz
Main Attenuation Frequency Band...............................................20Hz~600Hz
Attenuation Capability. .................................................................18~21dB
Power Consumption.....................................................................30mW
General:
Height: 10 to 14cm
Colour: Black
Boom: Flexible