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HMEC 250
Headset for
general aviation
Instruction manual
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Contents Important safety instructions ...................................................2 Delivery includes ..........................................................................4 The HMEC 250 headset ...............................................................5 Operating elements .....................................................................7 Putting the headset into operation .........................................8 Inserting the batteries ....................................
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Important safety instructions • Please read this instruction manual carefully and completely before using the headset. • Make these this instruction manual easily accessible to all users at all times. Always include this instruction manual when passing the headset on to third parties. • During flight operation, do not use the headset for telephone calls. • With the NoiseGard active noise compensation switched on, typical aircraft sounds (for example, those from engines, propellers, warni
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Safety instructions for batteries If abused or misused, batteries may leak and, in extreme cases, may even present an explosion and fire hazard. Sennheiser does not accept any liability for damage arising from abuse or misuse. Keep batteries out of Observe correct reach of children. polarity. Do not heat or Switch off battery throw into fire. powered devices when not in use. Remove batteries Dispose of exhausted when the device batteries at special is not used for collection points or
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Intended use of the headset Intended use includes: • having read this instruction manual, especially the chapter “Important safety instructions” on page 2, • using the headset within the operating conditions and limitations described in this instruction manual. “Improper use” means using the headset other than as described in this instruction manual, or under operating conditions which differ from those described herein. Delivery includes Delivery of the HMEC 250 headset includes: 1 HMEC 250
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The HMEC 250 headset The HMEC 250 headset with NoiseGard 2.0 active noise compensation features closed, dynamic, circumaural stereo headphones. The HMEC 250 is a headset for general aviation use. TM NoiseGard 2.0 The NoiseGard 2.0 active noise compensation system is based on the principle of cancelling out sound using “anti- sound” (phase-inverted sound). Tiny microphones pick up low-frequency ambient noise (up to 1 kHz) near the ear. The NoiseGard 2.0 electronics use this noise to generat
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Additional features • Outstanding transmission quality for clear communi- cations • Good passive attenuation of ambient noise • Foldable design for space-saving storage and transpor- tation • Noise-compensating boom microphone ensures excellent speech transmission • Flexible microphone boom • Separate left and right channel volume control •Excellent comfort resulting from soft ear pads and head- band padding • Audio-input facility for external audio sources, such as mobile phones, MP3 players
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Operating elements
Headset Operating control integrated in the cable Microphone sensitivity control
Cable with microphone plug, 5.25 mm jack plug Headset cable Cable with headphone plug, Microphone boom ¼” (6.35 mm) jack plug Ear pads, ergonomic 3.5 mm jack socket for connecting an Headband additional audio player (3-pin) Battery compartment (on both sides) 2.5 mm jack socket for connecting a mobile telephone (3-pin) Operating control i
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LED indications Meanings of the LED : LED Meaning red NoiseGard is switched on green TalkThrough is switched on flashing Batteries are almost flat Putting the headset into operation Inserting the batteries Insert the batteries into the battery compartments on the left and right ear cups as follows: Open the battery compartment by pushing the catch and open the cover. Insert the AAA size battery as shown. Close the battery compartment . The battery compart- ment cover locks into pla
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Connecting a mobile telephone The 2.5 mm jack socket allows you to connect a mobile
telephone. For this purpose, the NoiseGard active noise compensation must be switched on and the microphone connector must be connected to the aircraft intercom. A suitable adapter for your mobile telephone with 2.5 mm jack socket is available from your specialist dealer. DANGER! Danger of accident due to reduced attention! Making telephone calls or operating the mobile telephone limits your attentio
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Connecting an additional audio player The 3.5 mm jack socket allows you to connect an additional audio player (e.g. MP3 player). DANGER! Danger of accident due to reduced attention! Listening to music or operating an audio player limits your attention and may cause accidents. During flight operation, do not use the headset for listening to additional audio sources! Hearing damage due to high volumes! This headset is capable of producing high sound pressure levels. Higher volumes or
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Adjusting the microphone sensitivity The microphone sensitivity has been factory preset to 80 mV/Pa. To change the input sensitivity of the microphone: Use a suitable slotted screwdriver. Turn the microphone sensitivity control as shown. Switching between mono and stereo mode The mono/stereo switch allows you to switch between mono and stereo mode, depending on the intercom system. Set the mono/stereo switch to the desired position: – mono – stereo 11
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Using the headset Attaching the cable clip The cable clip allows you to attach the headset cable to your clothing so that the cable doesn’t hinder or distract you. Guide the headset cable through the cable clip as shown. Attach the cable clip to your clothing. Adjusting the headset Wear the headset so that – the microphone boom is on the left side of the mouth (see right/left labeling on the headband joints) and – the headband runs over the top of your head. Adjust the le
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Adjusting the microphone boom Bend the microphone boom so that the microphone is placed at the corner of the mouth. Maintain a distance of approx. 2 cm between microphone and mouth. Adjusting the volume CAUTION! Hearing damage due to high volume levels! The headset is capable of producing high sound pressure levels. Higher volumes or longer durations can damage your hearing! Adjust the volume to a medium level. Make sure that you can hear critical environmental sounds and warning ala
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Switching the TalkThrough function on/off The HMEC 250 provides excellent attenuation of ambient noise. In order to allow you to communicate undisturbed with the people around you while wearing the headset, the HMEC 250 features a TalkThrough function. Press the TALK THROUGH button to switch the TalkThrough function on or off. When the TalkThrough function is switched on, the LED lights up green. Adjusting the volume of the TalkThrough function To increase the volume of the TalkT
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Switching NoiseGard on/off To switch the NoiseGard active noise compensation on or off: Press the ON/OFF button for approx. one second. When NoiseGard is switched on: –the LED lights up red and – you can listen to music and make telephone calls at the same time. Fail safe operation When the batteries are completely discharged, NoiseGard automatically switches off. RT traffic (e.g. ATC) and intercom will still be heard through the headphones. 15
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Replacing the batteries When the batteries are almost flat, the LED flashes. When the batteries are completely discharged, NoiseGard automatically switches off (fail safe operation). Replace the batteries or the rechargeable batteries as follows: Always replace the two batteries at the same time. Open the battery compartment by pushing the catch and open the cover. Remove the battery. Insert a new AAA size battery as shown. Close the battery compartment . The battery compartment c
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Folding up the headset For space-saving transportation, the headset can be folded up in different ways: To fold up the headphones as flat as possible: Rotate the ear cups by 90° and turn the microphone boom flat as shown. To fold up the headphones as compact as possible: Fold the ear cups in as shown. For safe transportation of the headset, use the supplied soft case and fold the headset as follows: Rotate the ear cups by 90°. Turn the microphone boom flat as shown. Pull out the right e
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Care and maintenance CAUTION! Liquids can damage the electronics of the headset! Liquids entering the housing of the headset can cause a short-circuit and damage the electronics. Only use a soft, slightly damp cloth to clean the headset. Do not use any solvents or cleansing agents. Use a soft, slightly damp cloth to clean the headset from time to time. Replacing the ear pads You can replace the ear pads. Spare ear pads are available as accessories. Accessories are available from your S
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Attach the ear pad so that the side with the thicker padding points downwards as shown. Press the new ear pad onto the ear cup until it clicks audibly into place. Repeat for the other ear cup. Replacing the wind shield You can replace the wind shield. The HMEC 250 is supplied with a spare wind shield. Carefully pull the wind shield from the microphone. Slide-on the new wind shield and ensure that it fits securely over the microphone. 19
