Sennheiser Headphones SET100 User Manual

Instructions for use  
Headset  
HME 100  
HME 105  
HME 120  
HMD 120  
25  
 
The HME 100, HME 105, HME 120 and HMD 120 are pilot headsets with closed ear  
protector headphones for use in helicopters, propeller and turboprop aircraft.  
Safety tips  
When using a headset, typical aircraft sounds (for example, those from engines,  
propellers, warning alarms, etc.) may sound different to you. Before operating any  
aircraft, make sure that, while wearing a headset, 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.  
Do not attempt to repair the headset yourself. If problems occur, contact your  
Sennheiser agent for assistance.  
Only replace parts of the headset whose replacement is described in this manual. All  
other parts of the headset must be replaced by your Sennheiser agent.  
Do not immerse the headset in water! For information on how to clean the headset,  
contact your Sennheiser agent.  
27  
 
Headset features  
HME 100 headset  
New passive headset with excellent noise attenuation  
Excellent comfort due to very low weight, soft ear cushions and padded headband  
as well as best possible freedom of movement due to unilateral connecting cable  
Foldable headband for easy and space-saving storage  
Clear communications due to MKE 45-1 electret microphone with adjustable sensitivity  
(sensitivity adjustment must be carried out by authorized personnel)  
Microphone can be easily positioned and worn on either left or right side due to  
flexible microphone boom with quick-fixing device  
Optimum radio reception due to headphone systems with wide frequency response  
Integrated volume control  
Adaption to the aircraft intercom system via Mono/Stereo switch  
Made in Germany, two-year warranty  
28  
 
Product variants  
HME 105 headset  
The HME 105 differs from the HME 100 in the following features:  
No Mono/Stereo switch  
Connection of headphones and microphone via XLR-5 plug  
HME 120 headset  
The HME 120 differs from the HME 100 in the following features:  
No Mono/Stereo switch  
Coiled cable  
Connection of headphones and microphone via U-174/U jack plug to a high impedance  
interface in the helicopter  
29  
 
HMD 120 headset  
The HMD 120 differs from the HME 100 in the following features:  
No Mono/Stereo switch  
Coiled cable  
M-87/AIC dynamic microphone and low impedance headphones  
Connection of headphones and microphone via U-174/U jack plug to a low impedance  
interface in the helicopter  
30  
 
Delivery includes  
HME 100, HME 105 and HME 120 headsets  
Headset  
Padded carry and storage bag with shoulder strap for headset and accessories  
Wind screen for microphone  
Cable clip MZQ 2002-1 (Cat. No. 4470)  
HMD 120 headset  
Headset  
Padded carry and storage bag with shoulder strap for headset and accessories  
Cable clip MZQ 2002-1 (Cat. No. 4470)  
Recommended Accessories  
Replaceable gel ear cushions (Cat. No. 83140)  
31  
 
Preparing the headsets for use  
Connecting the headsets  
HME 100 headset:  
1
1/4” (6.35 mm) stereo jack plug for connecting the headphones  
1
PJ-068 jack plug for connecting the microphone  
Ǡ
Connect the 1/4” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack  
plug for the microphone to the corresponding jack sockets of your intercom.  
Connecting cable for HME 100  
HME 105 headset:  
1
XLR-5 plug for connecting the headphones and the microphone  
Ǡ
Connect the XLR-5 plug for the headphones and the microphone to the XLR-5 socket  
of your intercom.  
Connecting cable for HME 105  
32  
 
HME 120 and HMD 120 headsets:  
1
U-174/U jack plug for connecting the headphones and the microphone  
Ǡ
Connect the U-174/U jack plug for the headphones and the microphone to the  
U-174/U socket of your intercom.  
Connecting cable for  
HME 120 and HMD 120  
33  
 
Adjusting the headband  
For good noise attenuation and best possible comfort, the headband has to be adjusted  
to properly fit your head:  
Ǡ
Ǡ
Wear the headset so that the headband runs over the top of your head.  
Adjust the length of the headband so that  
your ears are completely inside the ear cushions,  
you feel even, gentle pressure around your ears,  
a snug fit is ensured.  
Note:  
Make sure not to squeeze any connecting cable when adjusting the headband.  
Squeezing can damage the connecting cables.  
Ǡ
Final adjustment is best made in a noisy environment.  
34  
 
Positioning the microphone  
Relocating the microphone boom  
The microphone boom can be worn on either side of the mouth.  
Ǡ
Ǡ
Ǡ
Loosen the quick-fixing device.  
Rotate the microphone boom by 180°.  
Tighten the quick-fixing device.  
Positioning the microphone towards the corner of the mouth  
The HME 100, HME 105 and HME 120 headsets feature a flexible 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.  
35  
 
For positioning the microphone of the HMD 120 headset, proceed as follows:  
Ǡ
Adjust the length of the microphone boom so that the microphone is placed at the  
corner of the mouth. To do so, loosen the quick-fixing device and adjust the  
microphone boom in length.  
Ǡ
Ǡ
Pull the middle part of the microphone boom towards the mouth so that the distance  
between microphone and mouth is approx. 2 cm.  
Tilt the microphone for final positioning.  
36  
 
Using the headsets  
Mono/Stereo selection (HME 100 only)  
In general, youll receive a mono sound source so that the Mono/Stereo switch can remain  
set to Mono’. When using a stereo intercom system, set the headset to stereo operation.  
Remove the ear cushion (u ‘Replacing the ear cushions’) from the earcup with the micro-  
phone boom attached and set the Mono/Stereo switch to Stereo.  
Adjusting the volume  
Exposure to loud sounds can cause hearing damage!  
Set the volume control to a medium value. Make sure that you can hear critical sounds  
such as warning alarms.  
37  
 
Adjusting the microphone gain  
Mic Gain Adjustment  
According to JTSO approval C58a, the microphone output voltage is factory-preset to  
400 mV. If the microphone output voltage is too high or too low for your intercom system,  
it can be re-adjusted on the microphone. To do so, use a small slotted screwdriver and turn  
the Mic Gain Adjustment’ screw (see illustration on the left) until you have reached the  
desired setting.  
Folding up the headphones  
For easy and space-saving transportation, the earcups can be folded up and tucked between  
the headband.  
Unfold the headphones by grasping both earcups and pulling them down and away from  
the headband.  
38  
 
Additional information for helicopter use of the HME 120 headset  
The polarity of the microphone connection in helicopters is not standardized. If the  
microphone of your headset does not work with the existing polarity, you can reverse the  
polarity on the headset by simply rotating the microphone module. To do so, please  
proceed as follows:  
1. Pull the wind screen from the microphone.  
2. Loosen the screws by approx. half a turn.  
3. Pull the microphone module from the boom-arm.  
4. Rotate the microphone module by 180°.  
5. Put the rotated microphone module back into the boom-arm.  
6. Now tighten the screws from the other side.  
7. Slide the windscreen over the microphone.  
Rotating the microphone module does not change its acoustic properties. Due to its noise-  
compensating pick-up pattern, the microphone can be used from either side.  
39  
 
Spare parts  
The following spare parts are available from your Sennheiser agent:  
Wind screen for MKE 45-1 electret microphone  
Cable clip  
Carry and storage bag with shoulder strap  
Ear cushions  
Replacing the wind screen  
If the wind screen for the electret microphone shows signs of wear such as tears or holes,  
replace the wind screen. Pull the wind screen from the microphone. Gently slide-on the  
new wind screen and ensure that it fits securely over the microphone.  
Replacing the ear cushions  
Replace the ear cushions if they are damaged. Grasp behind the ear cushions and pull  
them up and away from the earcups. Slide the new ear cushions onto the earcups.  
For best results replace the ear cushions after 100 hours of use or two years.  
40  
 
Connector assignment  
3
2
4
1
5
solder side  
1
2 3 4  
U174/U jack plug  
XLR-5 connector  
1
2
3
4
Microphone Lo  
Audio Hi  
Microphone Hi  
Audio Lo  
1
2
3
4
5
Audio Hi  
Audio Lo  
Microphone Hi  
Microphone Lo  
1
2
3
1
2
3
1/4” (6.35 mm) stereo jack plug  
PJ-068 jack plug  
1
2
3
Audio Hi left  
Audio Hi right  
Audio Lo  
1
2
3
Not assigned!  
Microphone Hi  
Microphone Lo  
41  
 
In case of difficulty  
If problems occur that are not listed in the below table, please contact your Sennheiser  
agent.  
Possible cause and what to do  
Problem  
Communications in one ear only  
(HME 100 only)  
You are using a stereo intercom system but the headset is set to mono operation.  
Ǡ
Set the Mono/Stereo switch to Stereo.  
You are receiving a mono source but the headset is set to stereo operation.  
Set the Mono/Stereo switch to Mono’.  
Ǡ
Very low volume communication  
The volume control is set too low.  
Check the volume setting of the headset.  
The headphone connection has been pulled out.  
Check to see if the headphone jack plug is correctly connected.  
Ǡ
Ǡ
Reduced intelligibility  
The microphone connection has been pulled out.  
Ǡ
Check to see if the microphone jack plug is correctly connected.  
42  
 
Problem  
Possible cause and what to do  
Microphone output voltage too  
high or too low  
Re-adjust the output voltage on the microphone.  
Ǡ
To do so, use a small slotted screwdriver and turn the ‘Mic Gain Adjustment’ screw  
(see illustration on page 38) until you have reached the desired setting.  
43  
 
Technical data  
HME 100  
ȊHME 105 and HME 120  
ȊHMD 120  
Headphones  
Transducer principle  
Ear coupling  
Frequency response  
Nominal impedance  
Attenuation  
dynamic  
circumaural, closed  
45–15,000 Hz  
150 , mono, 300 , stereo  
> 10–40 dB  
Ȋ150 , mono  
Ȋ16 , mono  
Contact pressure  
approx. 10 N  
Microphone incl. preamplifier  
Transducer principle  
electret mic capsule,  
noise-compensated  
MKE 45-1  
Ȋelectret mic capsule,  
Ȋnoise-compensated  
ȊMKE 45-1  
Ȋdynamic,  
Ȋnoise-compensated  
ȊM-87/AIC  
Frequency response  
Sensitivity  
300–5,000 Hz  
Ȋ300–5,000 Hz  
Ȋ–  
Ȋ500–4,000 Hz  
Ȋ1.8–4 µV/74 dB bei 5 Ω  
Max. sound pressure level  
Min. terminating impedance  
Output voltage  
120 dB  
150 Ω  
400 mV 3dB  
at 114 dB  
Ȋ120 dB  
Ȋ150 Ω  
Ȋ400 mV 3dB  
Ȋat 114 dB  
Ȋ–  
Ȋ–  
Ȋ–  
Ȋ
(as per RTCA/DO 214)  
Ȋ(as per RTCA/DO 214)  
Ȋ
44  
 
HME 100  
ȊHME 105  
ȊHME 120  
ȊHMD 120  
Supply voltage  
typ. 16 V DC  
(8–16 V DC,  
Ȋtyp. 16 V DC  
Ȋ(8–16 V DC,  
Ȋtyp. 16 V DC  
Ȋ(8–16 V DC,  
Ȋ–  
Ȋ
approx. 8–25 mA  
as per RTCA/DO 214)  
Ȋapprox. 8–25 mA  
Ȋas per RTCA/DO 214) Ȋas per RTCA/DO 214)  
Ȋapprox. 8–25 mA  
Ȋ
Ȋ
General Data  
Connecting cable  
1.5 m,  
Ȋcoiled cable,  
unilateral  
Ȋunilateral  
Weight without cable  
Connectors  
350 g  
6.35 mm stereo jack plug  
for headphones,  
PJ-068 jack plug for microphone Ȋmicrophone  
Mono/Stereo switch  
Volume control for headphones  
Operation  
ȊXLR-5 for  
Ȋheadphones and  
ȊU-174/U jack plug for ȊU-174/U jack plug for  
Ȋheadphones and  
Ȋmicrophone  
Ȋ–  
Ȋheadphones and  
Ȋmicrophone  
Ȋ–  
Controls  
Ȋ–  
Temperature range  
-15°C ... + 55°C  
Storage  
-55°C ... + 55°C  
45  
 
Certificate of Conformity  
Sennheiser electronic GmbH & Co. KG declare that this device conforms to the applicable CE standards and regulations.  
Forup-to-date information on Sennheiserproducts, you can also visit the SennheiserWeb site at http://www.sennheiser.com.  
46  
 
Sennheiser electronic GmbH & Co. KG  
D-30900 Wedemark  
Telefon 05130/600-0  
Telefax 05130/600-300  
Printed in Germany  
Publ. 01/03  
83566 / A02  
 

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