David Clark ENC Manuale utente

ELECTRONIC

NOISE CANCELLING

HEADSETS

OWNERS MANUAL

SATISFACTION GUARANTEE

The idea of a guarantee that a product will function in accordance with certain

claims, and will be replaced or repaired if it fails to perform to those standards, has

been popular for decades. In these times, most guarantees promise safeguards

against failure over varying periods, and are worded such that proving fault with

the manufacturer has become primarily the customer’s responsibility.

A guarantee made by the David Clark Company assumes full responsibility for the

quality and the performance of the product, to your satisfaction; it is supported

by a policy of service to customers which is based on the premise that our

relationship is one of mutual honesty, requiring that we respond in a prompt,

positive manner to anyone who contacts us.

David Clark Company communication equipment has evolved to a performance level

of excellence that is appreciated by quality conscious people throughout the world.

We strive constantly for excellence in design, and performance, and have a

positive attitude toward constructive criticism, especially from our customers.

We have earned a reputation for excellence; we intend to keep it, and to

continue deserving your confidence!

Robert A. Vincent,President

CONTENTS

Description & Technical Information............................................................. 3-4

Operation & Instructions...............................................................................5-7

Features - H-10 Series.................................................................................... 8

Features - H10-66XL Series............................................................................ 9

Features - H10-76XL and H10-76XP............................................................10

Accessories - Power Options................................................................... 11-12

Maintenance & Cleaning ................................................................................ 13

Customer Service............................................................................................BC

ELECTRONIC NOISE

CANCELLATION

DESCRIPTION & TECHNICAL INFORMATION:

How it works.

David Clark’s Electronic Noise Cancellation (ENC) headsets feature the latest

advances in electronic noise cancellation technology. They’re specially designed

for pilots of aircraft which generate noise at lower frequencies. Headsets relying

on passive noise control methods alone cannot suppress low frequencies as

effectively as mid and high range frequencies.

Opposites protect.

Unlike passive headsets, David Clark’s electronic noise cancellation headsets use

an electronically produced signal to cancel the offending noise. Low frequency

noise is sensed and an opposing signal of the same sound level is generated.

The result is cancellation of the noise before it reaches your ears.

Hear what’s important.

With low frequency noise canceled, you’ll hear essential communications clearly,

and with less strain. Sounds within the range of the human voice, such as air

traffic messages and conversations with other pilots, will be easier to verify.

Such improved audio comfort leads to alert, and safer flying.

cancelling

effect

Passive versions of these headsets already exhibit excellent noise reduction ratings

(NRR). Test measurements indicate an increase in attenuation at lower frequencies

when ENC is switched on. At the present time there is no ANSI test standard for

independent measuring of the effectiveness of Electronic Noise Cancellation.

Fail-safe:

An important product feature is true “fail-safe” operation. By having dual earphone

drivers, which are electronically independent, no interruption of communication can

result from failure of the ENC system or its power source.

Headset:

Sensitivity: 90dB +- 5dB SPL on flat plate coupler, re 1mW input @ 1 KHz.

Frequency Response: 350-3,000 Hz +- 6dB re 1 KHz.

Impedance: Monaural, 150 Ω nominal; Stereo, 300 Ω nominal

per side. (Does not apply to H10-76XL series.)

Microphones:

M-7A:

■Incremental DC and Dynamic AC, 50 Ω

20%.

■Sensitivity: 400 mV

6dB into 150 Ω AC load @ 1 KHz for 114dB SPL input.

M-101:

■Low Impedance Position: 5 Ω nominal, sensitivity .07-.14 mV@ 103 dB SPL

into 5 Ω load @ 1000 Hz.

■High Impedance Position: 400 mV

6 dB @114 dB SPL 1/4”, 1000 Hz bias

8-16 volts behind 470 Ω and with a 150 Ω AC input impedance.

M-87:

■ Microphone designed to be used in aircraft requiring a LOW IMPEDANCE

microphone. Microphone impedance is nominally 5 Ω.

■ Sensitivity: .05 to 11 mV across 5 Ω load at 1000 Hz with an input of

103 dB SPL.

■ Frequency response: 200-6000 Hz

ATTENUATION

OPERATION

Electronic noise cancellation is an “electrical” process. Power to drive the circuitry

is obtained from either the Portable Battery Power Module (models ending in “XL”

or “X”) or the aircraft’s electrical system (models ending with “XP”).

XL-9V

Instructions

Introduction

The model XL-9V battery pack uses a

9 volt alkaline battery to provide power

to the headset ENC system. The XL-9V

features an Auto Shut Off function to save

the battery if the power switch is left on

when the headset is not in use. The Auto

Shut Off feature operates by sensing loss

of microphone DC bias voltage when the

headset is unplugged or aircraft audio

system is shut off.

A switch is provided inside the battery

compartment (see Fig.1) to control the

Auto Shut Off feature.

The XL-9V is

shipped from the factory with the switch in the DISABLE position,

which will provide continuous power to the ENC system whenever

the power switch is on.

GENERAL AVIATION PORTABLE BATTERY MODULE

To Enable Auto Shut Off

The ENABLE position provides automatic shut off of power to the ENC system if the

headset is unplugged or the aircraft audio system power is turned off. To operate

the Auto Shut Off switch remove the battery, and using a small pointed tool gently

move the switch to the desired position. Replace battery (see Fig. 1).

Power Indicator

A bi-color LED, mounted on the top of the battery pack indicates the status of the

battery (see Fig. 2).

When the battery is good and the headset is powered, the LED will blink green

approximately once per second. When the battery is low, the LED will be red until

the battery is fully discharged (see Fig. 2).

AUTO SHUT OFF

ENABLE DISABLE

View into the battery compartment,

showing Auto Shut Off switch

View of the top of the battery module,

showing LED

Fig. 2

Fig. 1

Battery Insertion and Removal

CAUTION! Improper battery insertion may damage unit.

To remove the battery compartment cover, press down lightly on the recess

and slide the cover back. To install the battery compartment cover, align with the

recess in the battery compartment and slide the cover forward until it snaps into

position (see Fig. 3).

To install battery, insert back of battery into battery compartment, making sure to

position the smaller positive terminal over the keying ribs in the front of the battery

compartment (see Fig. 4). Press contact end of battery firmly until battery is

seated in the battery compartment fully. To remove battery, lift up on the back

of the battery and slide out of battery compartment.

(1)

SLIDE

COLLAR

BACK

(2)

PULL

(1)

LINE UP

KEYWAY

(2)

PUSH ON

Connector Insertion and Removal (not applicable to 13X version)

Fig. 3

Fig. 4

Belt Clip Removal

Push down and slide at same

time to remove belt clip

GENERAL AVIATION

H-10 SERIES HEADSET

Features:

Exclusive, Patented Flex/Wire Boom

Rotates for left or right side positioning.

Detented for precise control. Wire slide

allows easy, repeatable microphone

placement.

Headband Locknut

When the headset is adjusted comfortably,

the locknut can be tightened for consistent

t to your head.

Microphone Protector

P/N 40062G-02

Volume Controls

Dual volume controls.

Select a comfortable listening

level for each ear. Both sides

are wired for unidirectional

operation. (Roll forward,

roll reverse, produces the

identical result in each

ear cup, regardless of

microphone placement.)

Undercut Comfort

Gel Ear Seals

P/N 40863G-02

IMPORTANT NOTE:

All General Aviation Headsets come with a 5 year warranty

Headpad Assembly

P/N 40688G-36

MILITARY

H10-66XL

SERIES HEADSET

Features:

IMPORTANT NOTE:

H10-66XL and H10-76XL headsets utilize XL-9V-M battery

pack with rotating belt clip

Headpad Assembly

P/N 18900G-48

Dynamic Microphone

P/N 09168P-20

Undercut Comfort

Gel Ear Seals

P/N 40863G-02

Exclusive, Patented Flex/Wire Boom

Rotates for left or right side positioning.

Detented for precise control. Wire slide allows

easy, repeatable microphone placement.

Volume Control

Low prole knob to prevent

accidental changes. Lets

you select a comfortable

listening level.

Headband Locknut

When the headset is adjusted comfortably, the locknut

can be tightened for consistent t to your head.

HIGH

LOW

High/Low Impedance

Select Switch

MILITARY

H10-76XL & H10-76XP

(LOW IMPEDANCE ENC HEADSETS)

Features:

IMPORTANT NOTE:

All Military Headsets come with a 1 year warranty

Exclusive, Patented Flex/Wire Boom

Rotates for left or right side positioning.

Detented for precise control. Wire slide allows

easy, repeatable microphone placement.

Headband Locknut

When the headset is adjusted comfortably,

the locknut can be tightened for consistent

t to your head.

Headpad Assembly

P/N 40688G-36

Dynamic Microphone

P/N 09168P-18

Volume Control

Low prole knob to prevent

accidental changes. Lets

you select a comfortable

listening level.

Undercut Comfort

Gel Ear Seals

P/N 40863G-02

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