Sennheiser HMEC 250 User Manual 2

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Sennheiser HMEC 250 User Manual 2

HMEC 250

Headset for general aviation

Instruction manual

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 ..........................................................

8

Connecting the headset ........................................................

8

Connecting a mobile telephone ..........................................

9

Connecting an additional audio player ...........................

10

Adjusting the microphone sensitivity ............................

11

Switching between mono and stereo mode ..................

11

Using the headset ....................................................................

12

Attaching the cable clip .....................................................

12

Adjusting the headset .......................................................

12

Adjusting the microphone boom .....................................

13

Adjusting the volume ........................................................

13

Switching the TalkThrough function on/off ..................

14

Adjusting the volume of the TalkThrough function ....

14

Switching NoiseGard on/off .............................................

15

Replacing the batteries .....................................................

16

Folding up the headset ............................................................

17

Care and maintenance .............................................................

18

Replacing the ear pads ......................................................

18

Replacing the wind shield .................................................

19

Specifications ............................................................................

20

Manufacturer declarations .....................................................

22

1

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, 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 critical sounds, especially warning alarms and sounds resulting from malfunction.

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.

Never repair or attempt to repair a defective headset yourself. Contact your Sennheiser partner or the Sennheiser Service Department.

Only replace those parts of the headset whose replacement is described in this instruction manual. All other parts of the headset must be replaced by your Sennheiser partner.

Protect the headset from wetness. Use only a slightly damp cloth to clean the headset. For information on how to clean the headset, contact your Sennheiser partner.

2

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

 

 

 

extended periods

 

 

 

 

 

return them to your

 

 

 

of time.

 

 

 

 

 

specialist dealer.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Do not solder.

 

 

 

 

 

 

Do not short-circuit.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Do not mutilate or

 

 

 

 

 

 

Do not attempt

 

 

 

dismantle.

 

 

 

 

 

 

to recharge

 

 

 

 

 

 

 

 

 

 

non-rechargeable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

batteries.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Do not pack charged

 

 

 

 

 

 

Always remove flat or

 

 

 

batteries loose –

 

 

 

 

 

 

exhausted batteries

 

 

 

danger of shorting

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

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 headset

1 soft case

1 HZC 08 cable clip

2 Wind and pop shields for MZW 46

1 audio-in cable for mobile telephones, length 0.6 m, with two 2.5 mm jack plugs

1audio-in cable for additional audio players, length 0.6 m, with two 3.5 mm jack plugs

2AAA size batteries

1 instruction manual

4

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 2.0TM

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. 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, NoiseGard automatically switches off. RT traffic (e.g. ATC) and intercom will still be heard through the headphones.

Peak level protection

The peak level protection safeguards your ears from volume peaks above 110 dB.

TalkThrough function (TT)

The TalkThrough function allows you to communicate with the people around you while wearing the headset. The NoiseGard active noise compensation and the peak level protection remain unaffected by the TalkThrough function and help to protect your hearing.

5

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

6

Operating elements

 

 

 

 

 

Headset

Microphone sensitivity control

Headset cable

Microphone boom

Ear pads, ergonomic

Headband

Battery compartment (on both sides)

Operating control integrated in the headset

TT VOLUME + button (Talk Through) ON/OFF button (NoiseGard)

TT VOLUME – button (Talk Through)

TALK THROUGH button (on/off)

LED (status display)

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 (3-pin)

2.5 mm jack socket for connecting a mobile telephone (3-pin)

Mono/stereo switch

Separate left and right channel slide volume controls

7

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