Sennheiser 250 Headphones User Manual
Contents
1. Improper use means using the headset other than as described in these instructions or under operating conditions which differ from those described herein Delivery includes Delivery of the HMEC 250 headset includes 1 HMEC 250 headset 1 soft case 1 cable clip 2 MZW 46 wind and pop shields 1 audio in cable for mobile telephones length 0 6 m with two 2 5 mm jack plugs 1 audio in cable for additional audio players length 0 6 m with two 3 5 mm jack plugs 2 AAA size batteries 1 instruction manual 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 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 generate a sound wave which is the exact opposite i e at the same level but polarity reversed 180 out of phase the result is that the polarity reversed signal cancels most of the outside noise Fail safe operation When the batteries are completely discharged the NoiseGard 2 0 active noise compensation automatically switches off RT traffic e g ATC and intercom will still be heard through the headphones Peak level protection2. The peak level protection safeguards your ears from volume peaks above 110 dB 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 Additional features Outstanding transmission quality for clear communications Good passive attenuation of ambient noise Foldable design for space saving storage and transportation 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 headband padding Audio input facility for external audio sources such as mobile phones MP3 players Operating elements P o OX Par an 7 T S 14 Headset Operating control integrated in the cable Microphone sensitivity control Cable with microphone plug Headphone cable 5 25 mm jack plug Microphone boom Cable with headphone plug Earpads Ya 6 35 mm jack plug Headband 3 5 mm jack socket for connecting an j additional audio player C paitinn partment on Dotngides 2 5 mm jack socket for connecting a Operating control integrated in the headset mobile telephone TT VOLUME button Mono stereo switch ON OFF button NoiseGard 2 0 Separate left and
3. 100 mV Pa 150 2 200 Q 8 16 V DC 1 4 6 35 mm jack plug 5 25 mm jack plug eres 123 1 1 Audio Hi left 2 Audio Hi right a jr 2 3 1 not assigned 2 Microphone Hi 3 Audio Lo 3 Microphone Lo 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 For this reason we recommend that the sales receipt be retained as proof of purchase Without this proof which is checked by the responsible Sennheiser service partner you will not be reimbursed for any repairs that are carried out Depending on our choice guarantee service comprises free of charge the removal of material and manufacturing defects through repair or replacement of either individual parts or the entire device Inappropriate usage e g operating faults mechanical damages incorrect operating voltage wear and tear force majeure and defects which were known at the time of purchase are excluded from guarantee claims The guarantee is void if the product is manipulated by non authorised persons or repair stations In the case of a claim under the terms of this guarantee
4. send the device including accessories and sales receipt to the responsible service partner www sennheiser com To minimise the risk of transport damage we recommend that the original packaging is used Your legal rights against the seller resulting from the contract of sale are not affected by this guarantee The guarantee can be claimed in all countries outside the U S provided that no national law limits our terms of guarantee 23 24 CE px 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 Before putting the device into operation please observe the respective country specific regulations WEEE Declaration Your Sennheiser product was developed and manufactured with highquality materials and components which can be recycled and or reused This symbol indicates that electrical and electronic equipment must be disposed of separately from normal waste at the end of its operational lifetime Please dispose of this product by taking it to your local collection point or recycling centre for such equipment This will help to protect the environment in which we all live Batteries The supplied batteries can be recycled Please dispose of them as special waste or return them to your specialist dealer In order to protect the environment only dispos
5. 4 SENNHEISER Bedienungsanleitung Instruction Manual Notice d emploi Istruzioni per l uso Instrucciones de uso Gebruiksaanwijzing Contents Important safety instructions oo eeeseeeseeeseeteneseeneateeneetenes 2 Delivery INCIUAES giant 4 The AMEC 250 headsets 5 Operating elements i ciato 7 LED indications seanna annaa 8 Preparing the headset for use ie 9 Inserting the batteries iii 9 Connecting the headset sssusa aea 9 Connecting a mobile telephone n 10 Connecting an additional audio player essees 11 Adjusting the microphone Sensitivity 12 Switching between mono and stereo mode 12 Using the headset si cississeccdisecii diester csaicinien 13 Attaching the cable Clipisiciusacscniuaiacieaaniacusan 13 Adjusting the headset sirsesssisssisissiiissiiiaininisii 13 Adjusting THE VOIUMEC i ercetsedvestereseveiratctasctectacaasavecats 14 Switching the TalkThrough function on off 15 Adjusting the volume of the TalkThrough function 15 Switching NoiseGard ON OFF uu ceceesesesseteeseseeeeeseeeeeeeees 16 Replacing the batteries oc sesscssessesscesesseseesseceseesees 17 Folding up the headset sssini 18 CAFE AMA Maintenance i 19 Replacing the Carpads ou csscsccssscsssessesessessssessesserssesene 19 Replacing the wind Shield oe essssssecesesessessesessesteeeenes 20 Accessories and spare parts iii 20 Specifi
6. C 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 D Press the TalkThroughbutton 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 TalkThrough function gt Press the TT VOLUME button To reduce the volume of the TalkThrough function gt Press the TT VOLUME button Note If you change the volume with the TalkThrough function switched on the new volume setting is saved and will be used as the default the next time the TalkThrough function is activated 15 16 Fail safe operation Switching NoiseGard on off To switch the NoiseGard 2 0 active noise compensation on or off gt 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 When the batteries are completely discharged the NoiseGard 2 0 active noise compensation automatically switches off RT traffic e g ATC and intercom will still be heard through the headphones Replacing the batteries When the batteries are almost flat the LED flashes When the batteries are completely discharged the NoiseGard 2 0 act
7. ble clip gt Attach the cable clip to your clothing Adjusting the headset gt Wear the headset so that the microphone boom is on the left side of the mouth see right left labeling on the headband joints the headband runs over the top of your head gt Adjust the length of the headband so that your ears are completely inside the earpads O you feel even gentle pressure around your ears a snug fit is ensured In this way optimum transmission quality good noise attenuation and best possible comfort is ensured gt Final adjustment is best made in a noisy environment 13 gt 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 A The headset is capable of producing high sound pressure levels Higher volumes or longer durations can damage your hearing gt Adjust the volume to a medium level Make sure that you can hear critical sounds such as warning alarms You can adjust the volume directly on the intercom or via the operating control integrated into the cable To adjust the volume for the left or right channel j b Slide one of the two volume controls i I a upwards to increase the volume or downwards to reduce the volume 14 Switching the TalkThrough function on off The HME
8. cations c ca iaia 21 Manufacturer declarations iene 23 Important safety instructions e Please read these instructions carefully and completely before using the headset Make these instructions easily accessible to all users at all times Always include these instructions 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 warning alarms etc may sound different to you Before operating any aircraft make sure that with NoiseGard switched on you can hear and recognize these sounds Set the volume to safe levels that do not interfere with your ability to hear informational sounds and warning alarms e The headset is capable of producing sound pressure levels exceeding 85 dB A In many countries 85 dB A is the maximum legally permissible level for continuous noise exposure during the working day Exposure to sounds of higher volume levels or for longer durations can permanently damage your hearing e Never repair or attempt to repair a defective headset yourself Contact your Sennheiser agent or the Sennheiser Service Department Only replace those parts of the headset whose replacement is described in this manual All other parts of the headset must be replaced by your Sennheiser agent Protect the headset from hum
9. e of exhausted batteries Sennheiser and NoiseGard are registered trademarks of Sennheiser electronic GmbH amp Co KG Sennheiser electronic GmbH amp Co KG 30900 Wedemark Germany Phone 49 5130 600 0 Fax 49 5130 600 300 www sennheiser com Printed in China Publ 06 07 516578 A02
10. e to high volumes This headset is capable of producing high sound pressure levels Higher volumes or longer durations can damage your hearing gt Set the volume to a medium level Make sure that you can hear critical sounds such as warning alarms gt Connect the audio cable to the 3 5 mm jack socket 8 on the operating control and to the corresponding jack socket on your audio player gt Switch NoiseGard 2 0 on see Switching NoiseGard on off on page 16 Audio from the additional audio source and from the intercom are heard simultaneously through the headset gt Operate the connected audio player as usual and observe the manufacturers instructions 11 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 D Use a suitable slotted screwdriver y De Turn the microphone sensitivity control as shown Switching between mono and stereo mode The mono stereo switch 0 allows you to switch between mono and stereo mode depending on the intercom system gt Set the mono stereo switch to the desired position Q mono stereo 12 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 gt Guide the headphone cable through the ca
11. f items Headband padding Specifications General data Weight without cable Temperature range operation Temperature range storage Power supply for NoiseGard Cable length Headphone connector Microphone connector Additional features Headphones Transducer principle Ear coupling Frequency response headphones Frequency response TalkThrough Nominal impedance passive Nominal impedance active approx 285 g 10 to 55 C 55 to 55 C 2 x 1 5 V AAA size battery or 2 x 1 2 V AAA size rechargeable battery 1 85m 1 4 6 35 mm jack plug 5 25 mm jack plug NoiseGard on off TalkThrough on off TalkThrough Volume mono stereo switch line input mobile telephone input peak level protection fail safe operation dynamic closed circumaural 8 28 000 Hz 300 5 000 Hz 150 Q mono 300 Q stereo 600 Q mono 1 200 Q stereo 21 22 Sound pressure level passive active THD at 94 dB SPL Attenuation Contact pressure Microphone incl preamplifier Type Transducer principle Frequency response Output voltage Terminating impedance Supply voltage Connector assignment 98 dB at 1 kHz 1V 100 db at 1 kHz 1 V lt 1 13 34 dB passive attenuation plus 16 25 dB active noise compensation at low frequencies approx 5 N MKE 46 pre polarized condenser microphone noise compensating 350 6 000 Hz 40 mV Pa factory pre set 400 mV at 114 dB SPL adjustable from 17
12. idity Use only a slightly damp cloth to clean the headset For information on how to clean the headset contact your Sennheiser agent 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 LO Observe correct reach and out of yf polarity WI sight of children Do not heat or throw Switch off battery _ i into fire powered devices when Ca notin use tt Remove batteries Dispose of exhausted when the device is F batteries at special va not used for collection points or extended periods of return them to your time specialist dealer Do not solder Do not short circuit tg Do not mutilate or Do not attempt 2 dismantle a to recharge non rechargeable batteries a Do not pack charged IAlways remove flat or YA batteries loose Lia exhausted batteries J danger of shorting ms from the device out fire hazard immediately Do not mix old or used batteries with new ones Do not mix batteries of different types or brands Intended use of the headset Intended use includes e having read these instructions especially the chapter Important safety instructions on page 2 using the headset within the operating conditions and limitations described in this instruction manual
13. ive noise compensation automatically switches off fail safe operation Replace the battery as follows Note Always replace the two batteries at the same time and open the cover TA a G gt Insert a new AAA size battery as shown in the diagram on j the left Please observe correct polarity when inserting ff gt Open the battery compartment by pushing the catch gt Remove the battery the battery gt Close the battery compartment The battery compart ment cover locks into place with an audible click Note Remove the batteries from the battery compartments if the headset will not be used for extended periods of time 17 18 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 gt Rotate the earcups by 90 and turn the microphone boom flat as shown To fold up the headphones as compact as possible b Tuck the earcups between the headband as shown For safe transportation of the headset use the supplied soft case and fold the headset as follows gt Rotate the earcups by 90 gt Turn the microphone boom flat as shown gt Pull out the right earcup and then fold it in gt Place the headset flat into the soft case as shown The two AAA size batteries can be inserted into the two straps at the side of the soft case The accessories can be transported in the cover
14. of the soft case Audio cable 3 5 mm Audio cable 2 5 mm MZW 46 wind and pop shields Care and maintenance CAUTION Liquids can damage the electronics of the headset A Liquids entering the housing of the headset can cause a short circuit and damage the electronics gt Only use a soft slightly damp cloth to clean the headset Do not use any solvents or cleansing agents gt Use a soft slightly damp cloth to clean the headset from time to time Replacing the earpads You can replace the earpads Spare earpads are available as accessories see Accessories and spare parts on page 20 gt Grasp the edge of the earpad behind the earcup and peel it up and away from the earcup gt Press the new earpad onto the earcup until it clicks audibly into place Repeat for the other earcup 19 20 0 Cat No 523889 523843 523844 044740 515297 514127 523897 Replacing the wind shield You can replace the wind shield The HMEC 250 is supplied with a spare wind shield gt Carefully pull the wind shield from the microphone gt Slide on the new wind shield and ensure that it fits securely over the microphone Accessories and spare parts Accessories Spare parts Earpads 1 pair Audio in cable 3 5 mm length 0 6 m 2 x 3 5 mm jack plug Audio in cable 2 5 mm length 0 6 m 2 x 2 5 mm jack plugs Cable clip Wind shield Wind shield any number o
15. operating the mobile telephone limits your attention and may cause accidents gt During flight operation do not use the headset for telephone calls Note For the latest list of compatible mobile telephones please refer to the Cell Phone Compatibility section on our website at www sennheiser com Search under Products Aviation and more info gt Connect the audio cable to the 2 5 mm jack socket on the operating control and to the corresponding jack socket on your mobile telephone You can adjust the volume of the mobile telephone via the headset s operating control However the functions of the mobile telephone cannot be controlled via the headset s operating control gt Switch NoiseGard 2 0 on see Switching NoiseGard on off on page 16 Audio from the mobile telephone and from the intercom are heard simultaneously through the headset gt Operate your mobile telephone as usual and observe the manufacturers instructions Connecting an additional audio player The 3 5 mm jack socket 8 allows you to connect and listen to an additional audio player e g MP3 player through the headset DANGER A Danger of accident due to reduced attention Listening to music or operating an audio device limits your attention and may cause accidents gt During flight operation do not use the headset for listening to additional audio sources Hearing damage du
16. right channel slide TT VOLUME button volume controls TalkThrough button LED LED indications Meanings of the LED LED Meaning red NoiseGard 2 0 operation green TalkThrough operation flashing Batteries are almost flat Preparing the headset for use Inserting the batteries Insert the batteries into the battery compartments on the left and right earcups as follows gt Open the battery compartment by pushing the catch and open the cover gt Insert the AAA size battery as shown in the diagram on the left Please observe correct polarity when inserting the battery gt Close the battery compartment The battery compart ment cover locks into place with an audible click Connecting the headset The headset s operating control features two cables with one jack plug each gt Connect the headset to the corresponding sockets of your intercom Connector for connection to the 1 4 6 35 mm jack plug headphone output 5 25 mm jack plug microphone input 10 Connecting a mobile telephone The 2 5 mm jack socket allows you to connect a mobile telephone For this purpose the microphone plug 6 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 DANGER Danger of accident due to reduced attention A Making telephone calls or
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