SEHT 30-60 USER MANUAL Edition 4
Page 4
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)
