HMEC250_516578_0507_SP6.book Seite 1 Mittwoch, 13.
HMEC250_516578_0507_SP6.book Seite 1 Mittwoch, 13. Juni 2007 3:18 15 Contents Important safety instructions ...................................................2 Delivery includes ..........................................................................4 The HMEC 250 headset ...............................................................5 Operating elements .....................................................................7 LED indications ................................................................
HMEC250_516578_0507_SP6.book Seite 2 Mittwoch, 13. Juni 2007 3:18 15 Important safety instructions y Please read these instructions carefully and completely before using the headset. y Make these instructions easily accessible to all users at all times. Always include these instructions when passing the headset on to third parties. y During flight operation, do not use the headset for telephone calls.
HMEC250_516578_0507_SP6.book Seite 3 Mittwoch, 13. Juni 2007 3:18 15 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 and out of polarity. sight of children. Do not heat or throw into fire. Switch off battery powered devices when not in use.
HMEC250_516578_0507_SP6.book Seite 4 Mittwoch, 13. Juni 2007 3:18 15 Intended use of the headset Intended use includes: y having read these instructions, especially the chapter “Important safety instructions” on page 2, y 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 these instructions, or under operating conditions which differ from those described herein.
HMEC250_516578_0507_SP6.book Seite 5 Mittwoch, 13. Juni 2007 3:18 15 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. NoiseGard 2.0 The NoiseGard 2.0 active noise compensation system is based on the principle of cancelling out sound using “antisound” (phase-inverted sound). Tiny microphones pick up low-frequency ambient noise (up to 1 kHz) near the ear.
HMEC250_516578_0507_SP6.book Seite 6 Mittwoch, 13. Juni 2007 3:18 15 TalkThrough function The TalkThrough function allows you to communicate with the people around you while wearing the headset. The NoiseGard 2.0 active noise compensation and the peak level protection remain unaffected by the TalkThrough function and help to protect your hearing.
HMEC250_516578_0507_SP6.book Seite 7 Mittwoch, 13. Juni 2007 3:18 15 Operating elements 햴 쐋 Headset Microphone sensitivity control Headphone cable Microphone boom Earpads Headband Battery compartment (on both sides) Operating control integrated in the cable Cable with microphone plug, 5.25 mm jack plug Cable with headphone plug, ¼” (6.35 mm) jack plug 3.5 mm jack socket for connecting an additional audio player 2.
HMEC250_516578_0507_SP6.book Seite 8 Mittwoch, 13. Juni 2007 3:18 15 LED indications Meanings of the LED 8 : LED Meaning red NoiseGard 2.
HMEC250_516578_0507_SP6.book Seite 9 Mittwoch, 13. Juni 2007 3:18 15 Preparing the headset for use Inserting the batteries Insert the batteries into the battery compartments on the left and right earcups as follows: 왘 Open the battery compartment by pushing the catch and open the cover. 왘 Insert the AAA size battery as shown in the diagram on the left. Please observe correct polarity when inserting the battery. 왘 Close the battery compartment .
HMEC250_516578_0507_SP6.book Seite 10 Mittwoch, 13. Juni 2007 3:18 15 Connecting a mobile telephone The 2.5 mm jack socket allows you to connect a mobile telephone. For this purpose, the microphone plug must be connected to the aircraft radio/intercom. A suitable adapter for your mobile telephone with 2.5 mm jack socket is available from your Sennheiser agent.
HMEC250_516578_0507_SP6.book Seite 11 Mittwoch, 13. Juni 2007 3:18 15 Connecting an additional audio player The 3.5 mm jack socket allows you to connect and listen to an additional audio player (e.g. MP3 player) through the headset. DANGER! Danger of attention! accident due to reduced Listening to music or operating an audio device limits your attention and may cause accidents.
HMEC250_516578_0507_SP6.book Seite 12 Mittwoch, 13. Juni 2007 3:18 15 Adjusting the microphone sensitivity The microphone sensitivity has been factory pre-set to 40 mV/Pa as per RTCA DO-214. To change the input sensitivity of the microphone: 왘 Use a suitable slotted screwdriver. 왘 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.
HMEC250_516578_0507_SP6.book Seite 13 Mittwoch, 13. Juni 2007 3:18 15 Using the headset Attaching the cable clip The cable clip allows you to attach the headphone cable to your clothing so that the cable doesn’t hinder or distract you. 왘 Guide the headphone cable through the cable clip . 왘 Attach the cable clip to your clothing.
HMEC250_516578_0507_SP6.book Seite 14 Mittwoch, 13. Juni 2007 3:18 15 왘 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! 왘 Adjust the volume to a medium level.
HMEC250_516578_0507_SP6.book Seite 15 Mittwoch, 13. Juni 2007 3:18 15 Switching the TalkThrough function on/off The HMEC 250 provides excellent attenuation of ambient noise. In order to allow you to communicate undisturbed with your surroundings while wearing the headset, the HMEC 250 features a TalkThrough function. 왘 Press the TalkThrough button to switch the TalkThrough function on or off. When the TalkThrough function is switched on, the LED lights up green.
HMEC250_516578_0507_SP6.book Seite 16 Mittwoch, 13. Juni 2007 3:18 15 Switching NoiseGard on/off To switch the NoiseGard™ 2.0 active noise compensation on or off: 왘 Press the ON/OFF button for approx. one second. When NoiseGard 2.0 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, the NoiseGard 2.0 active noise compensation automatically switches off. RT traffic (e.g.
HMEC250_516578_0507_SP6.book Seite 17 Mittwoch, 13. Juni 2007 3:18 15 Replacing the batteries When the batteries are almost flat, the LED flashes. When the batteries are completely discharged, the NoiseGard 2.0 active noise compensation automatically switches off (fail safe operation). Replace the battery as follows: Note: Always replace the two batteries at the same time. 왘 Open the battery compartment by pushing the catch and open the cover. 왘 Remove the battery.
HMEC250_516578_0507_SP6.book Seite 18 Mittwoch, 13. Juni 2007 3:18 15 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: 왘 Rotate the earcups by 90° and turn the microphone boom flat as shown. To fold up the headphones as compact as possible: 왘 Tuck the earcups between the headband as shown.
HMEC250_516578_0507_SP6.book Seite 19 Mittwoch, 13. Juni 2007 3:18 15 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. 왘 Only use a soft, slightly damp cloth to clean the headset. Do not use any solvents or cleansing agents. 왘 Use a soft, slightly damp cloth to clean the headset from time to time. Replacing the earpads You can replace the earpads.
HMEC250_516578_0507_SP6.book Seite 20 Mittwoch, 13. Juni 2007 3:18 15 Replacing the wind shield You can replace the wind shield. The HMEC 250 is supplied with a spare wind shield. 왘 Carefully pull the wind shield from the microphone. 왘 Slide-on the new wind shield and ensure that it fits securely over the microphone. Accessories and spare parts Cat. No. Accessories/Spare parts 523310 Earpads (1 pair) 523843 Audio-in cable (3.5 mm), length 0.6 m, 2 x 3.5 mm jack plug 523844 Audio-in cable (2.
HMEC250_516578_0507_SP6.book Seite 21 Mittwoch, 13. Juni 2007 3:18 15 Specifications General data Weight without cable approx. 285 g Temperature range (operation) -10 to +55 °C Temperature range (storage) -55 to +55 °C Power supply for NoiseGard 2 x 1.5 V AAA size battery or 2 x 1.2 V AAA size rechargeable battery Cable length 1.85 m Headphone connector ¼” (6.35 mm) jack plug Microphone connector 5.
HMEC250_516578_0507_SP6.book Seite 22 Mittwoch, 13. Juni 2007 3:18 15 Sound pressure level passive 98 dB at 1 kHz, 1V active 100 db at 1 kHz, 1 V THD at 94 dB SPL <1% Attenuation 13–34 dB passive attenuation, plus 16–25 dB active noise compensation at low frequencies Contact pressure approx. 5 N Microphone incl.
HMEC250_516578_0507_SP6.book Seite 23 Mittwoch, 13. Juni 2007 3:18 15 Manufacturer declarations Warranty regulations The guarantee period for this Sennheiser product is 3 years from the date of purchase. Excluded are accessory items, rechargeable or disposable batteries that are delivered with the product; due to their characteristics these products have a shorter service life that is principally dependent on the individual frequency of use. The guarantee period starts from the date of original purchase.
HMEC250_516578_0507_SP6.book Seite 24 Mittwoch, 13. Juni 2007 3:18 15 CE Declaration of Conformity This equipment is in compliance with the essential requirements and other relevant provisions of Directive 89/ 336/EU. The declaration is available on the internet site at www.sennheiser.com.
HMEC250_516578_0507_SP6.book Seite 1 Mittwoch, 13. Juni 2007 3:18 15 Sennheiser electronic GmbH & Co. KG 30900 Wedemark, Germany Phone +49 (5130) 600 0 Fax +49 (5130) 600 300 www.sennheiser.com Printed in China Publ.
