User manual SENNHEISER HMEC 461

[. . . ] Instructions for use HMEC 460 Contents Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 The HMEC 460 headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Delivery includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Overview of operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The headset is delivered ex-works with the "auto shut-off" function deactivated. To activate the "auto shut-off" function: Open the cover of the battery compartment Set the switch to the position "ASO". "Audio-In" signals mute automatically in the presence of intercom and/or RT traffic. 15 Adjusting the headset Adjusting the headband For good noise attenuation and best possible comfort, the headband has to be adjusted to properly fit your head: Note: Make sure not to squeeze any connecting cable when adjusting the headband. Adjust the length of the headband as shown so that ­ your ears are completely inside the earpads, ­ you feel even, gentle pressure around your ears, ­ a snug fit is ensured. 16 Rotating the microphone boom The microphone boom can be worn on either side of the mouth. Tighten the quick-fixing device ·. » · Changing the left and right stereo channel The operating control is fitted with a boom switch ¸. 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. ¸ If the microphone is worn on the right side of the mouth: Set the boom switch ¸ to the position "R". If the microphone is worn on the left side of the mouth: Set the boom switch ¸ to the position "L". 17 Positioning the microphone towards the corner of the mouth The microphone boom is flexible, so you can position it individually. Bend the microphone boom so that the microphone is placed at the corner of the mouth. 2 cm between microphone and mouth. 18 Using the headset Switching between mono and stereo mode The operating control is fitted with a mono/stereo switch, which allows you to switch between mono and stereo mode to suit the aircraft radio / audio panel / intercom installation. ¹ If the audio panel, intercom system or radio installation in your aircraft is mono: Set the mono/stereo switch ¹ on the operating control to position "k" (mono). If the audio panel, intercom system or radio installation in your aircraft is stereo, for example if there is a music player such as a CD player installed in the panel: Set the mono/stereo switch ¹ on the operating control to position "k (stereo). k" The left and right channels from the audio panel will be fed to the corresponding sides of the headset. Notes: ­ If you set the mono/stereo switch to "k (stereo) and you find that you only hear k" RT or intercom in one side of the headset then you should set the mono/stereo switch to "k" (mono). 19 ­ Setting the mono/stereo switch to "k" (mono) when the aircraft panel is wired as a stereo system will result in you hearing only the left channel of audio from the panel in both sides of the headset. Depending on how the panel is configured you may not hear some sounds from the panel in this case. Refer to the aircraft operating handbook or a qualified avionics engineer. Adjusting the volume The operating control is fitted with two slide volume controls adjust the volume for the left and right channel separately. Use the two slide controls to adjust the desired volume. 20 Switching NoiseGard on/off Set the NoiseGard ON/OFF switch ON: to the desired position: "ON" or "OFF". The LED lights up, indicating the battery status (see page 12) or power supply via the on-board DC power supply system. The LED With the NoiseGard active noise compensation switched off, the headset can be used as a conventional headset. Attaching the cable clip The headphone cable can be fixed by means of the cable clip. [. . . ] A further reduction in noise of 10 dB again results in a decrease in unwanted noise by 50 %. 29 Specifications Headphones Transducer principle Ear coupling Frequency response Nominal impedance active/passive Attenuation (active/passive) Contact pressure dynamic circumaural, closed 20­20, 000 Hz 400/300 , mono 600/600 , stereo > 25­40 dB approx. terminating impedance Output voltage Supply voltage 30 pre-polarized condenser microphone capsule, noise-compensating, MKE 45-1 300­5, 000 Hz 120 dB 150 400 mV ± 3 dB at 114 dB (as per RTCA/DO 214) typ. 8-25 mA, as per RTCA/DO 214) General data Connecting cable Weight without cable Power supply for NoiseGard Fuse Connectors 1. 5 m, single-sided 370 g 12­35 VDC 1. 5 A fuse 5. 25 mm jack plug (PJ-068 equivalent) for microphone, ¼" (6. 35 mm) jack plug for headphones, XLR-3 plug for NoiseGard mono/stereo switch on/off switch for NoiseGard LED for operation and battery status indicator volume control for headphones operation: -15 °C to +55 °C storage: -55 °C to +55 °C approx. 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