Instruction/ maintenance manual of the product HMEC 322 Sennheiser
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Headset HMEC 300 HMEC 302 HMEC 305 HMEC 305-C HMEC 306 HMEC 322 HMEC 400 HMDC 322 111 ™ Instructions for use.
112 Contents Safety tips .................................................................................................... 113 Headset featur es .............................................................................................. 114 Product variants .
113 The HMEC 300, HMEC 302, HMEC 305,HMEC 305-C, HMEC 306, HMEC 322, HMEC 400 and HMDC 322 are pilot headsets with closed ear protector headphones and NoiseGard™ active noise compensation for use in helicopters, propeller and turboprop aircraft.
114 Headset featur es HMEC 300 NoiseGard™ headset • New active headset with effective attenuation of external noise across the entire frequency spectrum due to NoiseGard™ active noise compensati.
115 • Power supply for NoiseGard™ is provided via on-board power supply system, cigarette lighter socket or battery pack • Fail safe operation in case of power failure • Supply voltage for the.
116 HMEC 305-C NoiseGard™ headset The HMEC 305-C differs from the HMEC 300 in the following features: • No Mono/Stereo switch • Connection of headphones and microphone via XLR-5 plug HMEC 306 No.
117 HMEC 400 NoiseGard™ headset The HMEC 400 differs from the HMEC 300 in the following features: • Stylish silver design • Leatherette ear cushions • Headband padding can be buttoned HMDC 322.
118 Delivery includes HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets • Headset • 3-pin XLR socket for aircraft panel mounting (power supply via the on-board system) • Padded carry and storage bag with shoulder strap for headset and accessories • Wind screen for microphone (except HMDC 322) • MZQ 2002-1 Cable clip (Cat.
119 ACX-1 ACX-2 ACX-11 ACX-22 Recommended accessories Replaceable gel ear cushions (Cat. No. 83140) BP-03 battery pack (except for HMEC 302, HMEC 305 and HMEC 306) Battery pack with XLR-3 socket for powering the NoiseGard™ electronics of the HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets.
120 Connecting the headsets Connecting cables for headsets HMEC 300 and HMEC 400 headsets: 1 1 / 4 ” (6.35 mm) stereo jack plug for connecting the headphones 1 PJ-068 jack plug for connecting the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics HMEC 302 headset: 1/ 4 ” (6.
121 Connecting cable for HMEC 322 and HMDC 322 HMEC 305-C headset: 1 XLR-5 plug for connecting the headphones and the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ elect.
122 Powering options There are three options for powering the NoiseGard™ active noise compensation: 1. Connection to the on-board system (12–35 V DC) 2. Connection to the BP-03 battery pack (accessory, except for HMEC 302, HMEC 305 and HMEC 306) 3.
123 1. Connecting the headset to the on-board system The NoiseGard™ electronics can be connected to on-board power supply systems with operating voltages between 12–35 V DC. The HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets are supplied with an XLR-3 socket for panel mounting in the aircraft.
124 Headset HMEC 302: 씰 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. HMEC 305 headset: 씰 Connect the XLR-5 plug to the aircraft’s XLR-5 socket.
125 2 . Connecting the headset to the battery pack (except HMEC 302, HMEC 305 and HMEC 306) The NoiseGard™ electronics of the HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets can also be powered via the BP-03 battery pack ( ‘Recommended accessories’).
126 Connecting the headset, turning on the battery pack 씰 Connect the XLR-3 plug of the headset connecting cable to the XLR-3 socket o n t h e connecting cable of the battery pack.
127 ACX-1 ACX-2 ACX-11 ACX-22 3 . Connecting the headset via a cigarette lighter adapter cable (except HMEC 302, HMEC 305 and HMEC 306) Sennheiser offers special adapter cables with XLR-3 socket for c.
128 Pr eparing the headsets for use Adjusting the headband For good noise attenuation and best possible comfort, the headband has to be adjusted to properly fit your head: 씰 Wear the headset so that the headband runs over the top of your head.
129 Positioning the microphone Relocating the microphone boom The microphone boom can be worn on either side of the mouth. 씰 Loosen the quick-fixing device.
130 For positioning the microphone of the HMDC 322 headset, proceed as follows: 씰 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.
131 Additional information for helicopter use of the HMEC 322 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.
132 Using the headsets Turning NoiseGard™ on/off With the NoiseGard™ active noise compensation turned off, the headset can be used as a conventional headset.
133 Mic Gain Adjustment Adjusting the microphone gain According to JTSO approval C58a, the microphone output voltage has to be factory- preset to 400 mV. If this output voltage is too high or too low for your intercom system, it can easily be re-adjusted on the microphone.
134 Spar e parts The following spare parts are available from your Sennheiser agent: • Wind screen for MKE 45-1 electret microphone • Ear cushions • Headband padding • Cable clip • Carry and.
135 Replacing the headband padding Replace the headband padding if it is damaged. 씰 Pull the Ziploc type fastening strips of the headband padding apart and remove the worn headband padding. 씰 Put the new headband padding around the headband. 씰 Pull the two edges of the headband padding together so that the fastening strips slightly overlap.
136 In case of dif ficulty If problems occur that are not listed in the below table, please contact your Sennheiser agent. Problem Clear communication but no active noise compensation Possible cause and what to do The NoiseGard™ electronics are turned off.
137 Problem Active noise compensation but very low volume communication Possible cause and what to do The volume control is set too low. 씰 Check the volume setting of the headset. The headphone connection has been pulled out (except HMEC 305, HMEC 305-C and HMEC 306).
138 V aluable information on NoiseGard™ The NoiseGard™ principle One of the greatest stress factors today is noise. Research has shown that noise affects the nervous system, and can cause tiredness, poor concentration, irritability and tension. Of even greater concern is the permanent damage to hearing that can result from noise at high levels.
139 A In response to these problems, Sennheiser has developed an active noise compensation system – NoiseGard™ – which, combined with a high-quality passive hearing protector, provides consistent noise attenuation over the entire audio range.
140 The above diagram shows noise compensation with NoiseGard™: Passive hearing protectors effectively attenuate noise from the middle and upper frequency range, the effect decreasing sharply in the lower range. However, active noise compensation with NoiseGard™ combined with passive hearing protectors results in a reduction of noise of approx.
141 23 1 4 2 1 3 solder side 5 3 1 2 1 2 3 4 6 Connector assignment U174/U jack plug 1 Microphone Lo 2 Audio Hi 3 Microphone Hi 4 Audio Lo HMEC 300 1 Not assigned! 2 Microphone Hi 3 Microphone Lo 1 / 4 ” (6.
142 T echnical data HMEC 300 HMEC 302 HMEC 306 HMEC 400 Headphones Transducer principle dynamic Ear coupling circumaural, closed Frequency response 45–15,000 Hz Nominal impedance active/passive 300/150 Ω , mono 600/300 Ω , stereo Attenuation (active and passive) > 25 – 40 dB Max.
143 HMEC 300 HMEC 302 HMEC 306 HMEC 400 General data Connecting cable 1.5 m, unilateral Weight without cable 370 g Power supply for NoiseGard™ 12–35 V DC Current consumption 27 mA (zero signal current), max. 80 mA Fuse 500 mA thermo fuse Connectors 6.
144 T echnical data HMEC 305 앚 HMEC 305-C 앚 HMEC 322 앚 HMDC 322 Headphones Transducer principle dynamic Ear coupling circumaural, closed Frequency response 45–15,000 Hz Nominal impedance active/passive 300/150 Ω , mono 앚 50/35 Ω , mono Attenuation (active and passive) > 25 – 40 dB Max.
145 HMEC 305 앚 HMEC 305-C 앚 HMEC 322 앚 HMDC 322 General data Connecting cable 1.5 m, unilateral 앚 coiled cable, unilateral Weight without cable 370 g Power supply for NoiseGard™ 12–35 V DC Current consumption 27 mA (zero signal current), max.
146 Certificate of Conformity Sennheiser electronic GmbH & Co. KG declare that this device conforms to the applicable CE standards and regulations. For up-to-date information on Sennheiser products, you can also visit the Sennheiser Web site at “http://www.
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