Sennheiser Headphones 502399 User Guide

HMEC 26  
Instruction manual  
 
 
Safety instructions  
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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.  
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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 agent or the  
Sennheiser Service Department.  
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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 humidity. Use only a slightly  
damp cloth to clean the headset. For information on  
how to clean the headset, contact your Sennheiser  
agent.  
Intended use of the headset  
Intended use includes:  
having read this instruction manual especially the  
chapter “Safety instructions”.  
using the headset in jet aircraft and within the  
operating conditions as described in this instruction  
manual.  
Improper use  
Improper use means using the headset other than as  
described in this instruction manual, or under operating  
conditions which differ from those described herein.  
2
 
The HMEC 26 headset  
The HMEC 26 headset with NoiseGard™ active noise  
compensation features dynamic, closed headphones. The  
noise-compensating condenser microphone ensures  
excellent speech transmission even in noisy  
environments. Designed for use in aircraft cockpits.  
Features  
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NoiseGard™ active noise compensation reduces  
ambient noise by up to 18 dB – consequently the radio  
volume can be decreased  
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Lightweight  
Extremely comfortable to wear due to the patented  
two-piece automatic headband and soft earpads  
Peak level protection (cannot be switched off)  
safeguards you from volume peaks above 110 dB  
“Flip-away” headphone allows single-sided listening  
Flexible microphone boom, can be worn on either left  
or right-hand side  
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Noise-compensating condenser microphone ensures  
excellent speech transmission  
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Single-sided cable, easy to replace  
With NoiseGard™ switched off, the headset can be  
used as a conventional headset  
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Power supply for NoiseGard™ from aircraft DC power  
supply system (on suitably equipped aircraft) or  
batteries/rechargeable batteries  
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“Auto shut-off” extends battery life  
TalkThrough function (HMEC 26-T only)  
3
 
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ETSO approval C57a/C58a  
Delivery includes  
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1 HMEC 26 headset  
1 cable clip  
1 wind and pop screen  
1 instruction manual  
1 carry bag  
1 EASA Form 1  
Operation  
Turning the microphone boom  
The microphone boom can be rotated. This allows the  
headset to be worn with the microphone boom positioned  
on either the left or right-hand side of the head.  
4
 
Putting on the headset  
When putting on the headset, the patented two-piece  
headband adjusts automatically.  
Positioning the microphone  
Bend the flexible microphone boom so that the micro-  
phone is placed at the corner of the mouth. Maintain a  
distance of approx. 2 cm between microphone and mouth.  
Always use the supplied wind and pop screen.  
5
 
Flipping away one earcup  
The headset features a “flip-away” earcup for single-  
sided listening.  
Adjusting the volume directly on the audio system  
Connect the headset to the corresponding sockets of your  
audio system. Adjust the volume directly on the audio  
system.  
Hearing damage due to high volumes!  
CAUTION!  
This headset is capable of producing high  
sound pressure levels. Higher volumes or  
longer durations can damage your hearing!  
Set the volume to a medium level. Make sure  
that you can hear critical sounds such as  
warning alarms.  
6
 
Adjusting the microphone sensitivity  
The microphone sensitivity has been factory pre-set to  
80 mV/Pa as per RTCA DO-214. You can change the  
microphone sensitivity by turning a small screwdriver in  
the direction of the arrow.  
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7
 
The operating controls of the HMEC 26  
Operating control I  
³ Volume controls  
· LED  
» NoiseGard™ ON/OFF  
º
switch  
³
·
¿ Mono/stereo switch  
´ BOOM switch L/R  
² 3.5 mm jack socket  
Battery compartment  
º 2.5 mm jack socket  
»
´
²
Headset with  
operating  
control I  
Operating element  
³
·
»
¿
´
²
º
HMEC 26-BV-K  
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HMEC 26-BV-KP  
HMEC 26-BV-CP  
HMEC 26-B-K  
HMEC 26-B-CP  
HMEC 26-V-KP  
HMEC 26-V-RP  
HMEC 26-V-CP  
HMEC 26-V-KX  
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8
 
Operating control II  
· LED  
» NoiseGard™ ON/OFF  
·
switch  
»
Headset with  
operating  
control II  
Operating element  
³
·
»
¿
´
²
º
HMEC 26-CP  
HMEC 26-KP  
HMEC 26-NP  
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9
 
Using the headset  
Switching NoiseGard™ on/off  
The NoiseGard™ ON/OFF switch » allows you to switch  
the NoiseGard™ active noise compensation on or off. With  
NoiseGard™ switched off, the headset can be used as a  
conventional headset.  
̈ Set the NoiseGard™ ON/OFF switch » to the desired  
position:  
ON: NoiseGard™ is switched on. The LED · lights up,  
indicating the battery charge status (see  
page 11) or power supply via the aircraft DC  
power supply system.  
OFF: NoiseGard™ is switched off. The LED · is off.  
Adjusting the volume  
The two slide volume controls ³ allow you to adjust the  
volume for the left and right channel separately.  
Hearing damage due to high volumes!  
CAUTION!  
This headset is capable of producing high  
sound pressure levels. Higher volumes or  
longer durations can damage your hearing!  
Set the volume to a medium level. Make sure  
that you can hear critical sounds such as  
warning alarms.  
̈ Use the two volume controls ³ to adjust the desired  
volume.  
10  
 
Switching between mono and stereo mode  
The mono/stereo switch ¿ allows you to switch between  
mono (k) and stereo (kk) mode, depending on the  
audio system.  
̈ Set the mono/stereo switch ¿ to the desired  
position: mono (k) or stereo (kk).  
Changing the left and right stereo channel  
The position “R” or “L” of the BOOM switch ´  
corresponds to the position of the microphone on the left  
or right side of the mouth. When the microphone boom is  
rotated to permit left or right side microphone  
orientation, the BOOM switch allows you to correctly  
assign the audio channels (L/R) to the appropriate  
headphone sides. This enables the correct orientation of  
the volume controls and any stereo audio signals. To  
move the BOOM switch, use a pointed tool.  
Powering NoiseGard™ via two (rechargeable) batteries  
̈ Insert two 1.5 V AA alkaline batteries (IEC LR 6) or  
two 1.2 V AA rechargeable batteries (IEC LR 6).  
Observe correct polarity when inserting the batteries.  
11  
 
The operating time with batteries/rechargeable batteries  
is approx. 60 hours.  
With NoiseGard™ switched on (see page 10), the LED ·  
provides information on the remaining battery/  
rechargeable battery capacity.  
LED · lights up yellow: The battery capacity is  
sufficient.  
LED · lights up red:  
The batteries are flat.  
Replace the batteries.  
Activating the “auto shut-off” function  
The battery-saving “auto shut-off” function automatical-  
ly switches the NoiseGard™ electronics off when the  
headset is disconnected from the audio system or when  
the aircraft avionics are switched off. The headset is de-  
livered ex-works with the function deactivated. You can  
activate “auto shut-off” as follows:  
̈ Set the switch to the position ASO.  
12  
 
Switching the TalkThrough function on/off  
(HMEC 26-T only)  
The headset provides excellent attenuation of ambient  
noise. In order to allow you to communicate undisturbed  
with your surroundings while wearing the headset, the  
HMEC 26-T features a TalkThrough function.  
̈ Press the TalkThrough button ³ to switch the  
TalkThrough function on. The LED · lights up. Press  
the TalkThrough button again to switch TalkThrough  
off.  
Note:  
The TalkThrough function can only be used when the  
NoiseGard™ active noise compensation is switched  
on.  
13  
 
Connecting a mobile telephone  
The 2.5 mm jack socket º 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 radio/audio.  
A suitable adapter for your mobile telephone with  
2.5 mm jack socket is available from your Sennheiser  
agent.  
Danger of accident due to reduced attention!  
CAUTION!  
Making telephone calls or operating the  
mobile telephone limits your attention and  
may cause accidents.  
During flight operation, do not use the  
headset for telephone calls!  
̈ Connect the audio cable to the 2.5 mm jack socket º  
on the operating control I 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.  
̈ Operate your mobile telephone as usual and observe  
the instructions of the manufacturer.  
The latest information on cell phone compatibility is  
̈ Search under “Products”, “Aviation” and “more info  
…”.  
14  
 
Connecting an additional audio player  
The 3.5 mm jack socket ² allows you to connect and  
listen to an audio player (not supplied) through the  
headset. For this purpose, the NoiseGard™ active noise  
compensation must be switched on.  
Danger of accident due to reduced attention!  
CAUTION!  
Listening to music or operating an audio  
device 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!  
CAUTION!  
This headset is capable of producing high  
sound pressure levels. Higher volumes or  
longer durations can damage your hearing!  
Set the volume to a medium level. Make sure  
that you can hear critical sounds such as  
warning alarms.  
̈ Connect the audio cable to the 3.5 mm jack socket ²  
on the operating control I and to the corresponding  
jack socket on your audio player.  
15  
 
Care and maintenance  
Cleaning the headset  
Use a soft, slightly damp cloth to clean the headset from  
time to time. If the headset is very dirty, use a cloth  
dampened with mild, soapy water. Do not use any  
solvents or cleansing agents.  
Danger of short-circuit due to the ingress of  
water!  
CAUTION!  
Water entering the housing of the headset  
can cause a short-circuit and damage the  
electronics.  
Replacing the earpads  
For reasons of hygiene, the earpads should be replaced  
from time to time.  
̈ Grasp the edge of the earpad and pull sharply.  
̈ Attach the new earpad to the earcup by pressing  
firmly around the earpad until you hear all 12 latches  
lock into place.  
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Accessories and spare parts  
By changing the cables, you can simply retrofit different  
operating controls (see page 8 and 9) or connectors (see  
page 19) to your headset.  
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Cable -CP  
Cat. No. 500852  
Cat. No. 500846  
Cat. No. 500837  
Cat. No. 500838  
Cat. No. 500842  
Cat. No. 500848  
Cat. No. 502183  
Cat. No. 500839  
Cat. No. 504030  
Cat. No. 500855  
Cat. No. 500853  
Cat. No. 502437  
Cable -V-CP  
Cable -B-CP  
Cable -BV-CP  
Cable -KP  
Cable -V-KP  
Cable -B-K  
Cable -BV-K  
Cable -BV-KP  
Cable -NP  
Cable -V-RP  
Cable -V-KX  
Audio cable, length 0.6 m,  
with two 3.5 mm stereo jack plugs Cat. No. 520316  
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Audio cable, length 0.6 m,  
with two 2.5 mm jack plugs  
Headband padding, 1 pair  
Cat. No. 520317  
Cat. No. 515629  
Cat. No. 529766  
Cat. No. 529767  
Cat. No. 502595  
Cat. No. 515297  
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Earpads, leatherette, 1 pair  
Earpads, leatherette, 100 pairs  
Hygiene pads HZH 26, 200 pairs  
Wind and pop screen, 1 item  
Wind and pop screen, any quantity Cat. No. 514127  
Carry bag  
Cat. No. 077408  
17  
 
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Cable clip MZQ 2002  
Cable clip HZC 08  
Cat. No. 044740  
Cat. No. 525787  
Cable clips  
HZC 08  
(for round cable only)  
MZQ 2002  
(for round or flat cable)  
18  
 
Product variants  
Model  
Cat. No.  
Part Number  
³ · » ¿ ´ ² ¶ º ¾ µ ¸  
HMEC 26*  
HMEC 26-T*  
HMEC 26-CP  
502397  
026-35  
502404  
026-C5  
502402  
026-35-999-3211  
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HMEC 26-V-CP 502405  
026-35-999-3251  
HMEC 26-B-CP 502398  
026-35-999-2291  
HMEC 26-BV-CP 502400  
026-35-999-2281  
502403  
026-35-999-3111  
HMEC 26-V-KP 502406  
026-35-999-3161  
502399  
026-35-999-1191  
HMEC 26-BV-K 502401  
026-35-999-1171  
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x
HMEC 26-KP  
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x
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x
x
x
x
x
x
x
HMEC 26-B-K  
x
x
HMEC 26-NP  
502397 + 500855  
026-35-999-3811  
x
x
x
x
x
HMEC 26-V-RP 502397 + 500853  
026-35-999-3661  
HMEC 26-V-KX 502397 + 502437  
026-35-999-4161  
HMEC 26-BV-KP 502397 + 504030  
026-35-999-2171  
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x
x
x
x
x
x
x
x
³
·
»
Single-sided round cable, 1.85 m  
XLR-5 connector  
¼“ (6.3 mm) jack plug  
(headphones)  
PJ-068 equivalent (microphone)  
8-pin Neutricon connector  
6-pin Redel connector  
º
¾
µ
¸
XLR-3 connector  
Aircraft powered  
Battery powered  
Operating control I (page 8)  
Operating control II (page 9)  
¿
´
²
* The headsets can be combined with all cables (see page 17).  
 
19  
Specifications  
Headphones  
Transducer principle  
dynamic, closed  
Ear coupling  
supra-aural  
Frequency response  
Impedance  
20–14,000 Hz  
600 mono/1.200 stereo  
Characteristic SPL  
92 dB SPL at 1 kHz, 1 mW, mono  
95 dB SPL at 1 kHz, 1 V  
Max. SPL  
120 dB SPL at 1 kHz  
Active noise compensation 18 dB (100 – 300 Hz)  
THD  
< 1 % at 1 kHz, 95 dB SPL  
approx. 3.6 N  
Contact pressure  
Microphone incl. preamplifier  
Type  
MKE 46  
Transducer principle  
pre-polarized condenser  
microphone,  
noise-compensating  
Frequency response  
Output voltage  
100–6,000 Hz  
adjustable from 17–100 mV/Pa,  
80 mV/Pa -2 dB  
(factory pre-set)  
800 mV -2 dB at 114 dB SPL  
Terminating impedance  
Supply voltage  
150–2,200 Ω  
8–16 V DC  
20  
 
General data  
Temperature range  
operation: –15 °C to +55 °C  
storage: –55 °C to +70 °C  
Weight without cable  
approx. 210 g  
Power supply for  
NoiseGard™  
2x 1.5 V AA alkaline battery  
(IEC LR 6) or  
2x 1.2 V AA rechargeable  
battery (IEC LR 6)  
with approx. 60 hrs operating time  
or  
12–35 V DC via  
aircraft DC power supply system  
(on suitably equipped aircraft),  
max. 35 mA  
Connector assignment  
HMEC 26-V-KX  
¼" (6.3 mm)  
jack plug  
PJ-068  
equivalent  
XLR-3 connector  
1
2
3
1 2  
3
1
3
2
1 Audio Hi left  
2 Audio Hi right  
3 Audio Lo  
1 not assigned  
2 Microphone Hi  
3 Microphone Lo  
1 NoiseGardTM (DC+)  
2 DC–  
3 not assigned  
21  
 
HMEC 26-CP, -V-CP, -B-CP, -BV-CP  
Solder side  
1
2
3
4
5
Audio Hi  
3
2
4
Audio Lo / DC–  
Microphone Hi  
Microphone Lo  
NoiseGardTM (DC+)  
1
5
HMEC 26-NP  
Solder side  
1
Audio Hi  
2
3
4
5
6
7
8
Audio Lo  
not assigned  
Microphone Lo  
Microphone Hi  
not assigned  
DC–  
NoiseGardTM (DC+)  
HMEC 26-V-RP  
Solder side  
1
NoiseGardTM (DC+)  
Audio Lo / DC–  
Audio Hi left  
Audio Hi right  
Microphone Hi  
Microphone Lo  
1
3
6
2
3
4
5
6
2
5
4
22  
 
HMEC 26-KP, -V-KP, -BV-KP, -B-K, -BV-K  
1/4" (6.3 mm) jack plug  
PJ-068 equivalent  
1
2
3
1 2  
3
HMEC 26-KP  
1 Audio Hi  
2 not assigned  
3 Audio Lo / DC–  
1 NoiseGard™ (DC+)  
2 Microphone Hi  
3 Microphone Lo  
HMEC 26-V-KP / -BV-KP  
1 Audio Hi left  
2 Audio Hi right  
1 NoiseGard™ (DC+)  
2 Microphone Hi  
3 Audio Lo / DC–  
3 Microphone Lo / DC–  
HMEC 26-B-K  
1 Audio Hi  
2 not assigned  
3 Audio Lo  
1 not assigned  
2 Microphone Hi  
3 Microphone Lo  
HMEC 26-BV-K  
1 Audio Hi left  
2 Audio Hi right  
2 Audio Lo  
1 not assigned  
2 Microphone Hi  
2 Microphone Lo  
23  
 
Manufacturer Declarations  
Warranty  
Sennheiser electronic GmbH & Co. KG gives a warranty of  
5 years on this product.  
For the current warranty conditions, please visit our web  
partner.  
CE Declaration of Conformity  
This equipment is in compliance with the essen-  
tial requirements and other relevant provisions of  
Directive 2004/108/EU. The declaration is avail-  
Before putting the device into operation, please observe  
the respective country-specific regulations!  
24  
 
 

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