acoustic measurement product selection guide endevco microphones, preamplifiers … · 2015. 1....

Acoustic meAsurement product selection Guide

Endevco® microphones, preamplifiers and accessories

meggitt sensing systems30700 Rancho Viejo Road, San Juan Capistrano CA 92675-1748, USAMeggitt (San Juan Capistrano), Inc d/b/a Meggitt Sensing Systems

Tel: +1 (949) 493 8181Fax: +1 (949) 661 7231

www.meggittsensingsystems.comwww.endevco.com

Andrew HohlaProduct Manager

Tel: +1 (949) 276 [email protected]

NVH testing

Cabin noise analysis

Pass-by noise testing

Environmental noise analysis

Building noise studies

Acoustic chamber testing

Appliance noise evaluation

Windtunnel testing

Prepolarized condenser measurement microphones

Low cost array microphones

iTEDS compliant (per IEEE 1451.1 standards)

Free-field, pressure and random incidence types

Microphone and preamplifier combination units

APPLICATIoNS

HIgHLIgHTS

Endevco® prepolarized condenser measurement microphones, available in 1/8”, ¼”, and ½” diameters, are offered in free-field, pressure, low-cost array and random incidence types and can be used to meet IEC and ANSI standards. Array microphones offer a lower overall per channel measurement cost and are directly compatible with Isotron® (IEPE-type) signal conditioning. They can be used as drop-in replacements within existing accelerometer test system set-ups for as-needed precision noise measurements. Models may be purchased as stand-alone units, or in a microphone and low-noise preamplifier combination with iTEDS on-board memory storage capabilities, facilitating their use within larger channel count applications. All microphones are constructed with a stainless steel protective grid case and housing, as well as a special stainless steel alloy diaphragm, for high reliability in a variety of application environments.

Available for use with Endevco precision measurement microphones are a full range of low-noise Isotron preamplifiers, handheld calibrators, and accessories. In addition, all acoustic sensors and instrumentation are covered by a five-year comprehensive product warranty. For detailed technical specifications, drawings or additional information on acoustic sensors, or other Endevco products available from Meggitt Sensing Systems, visit www.meggittsensingsystems.com.

measurement microphones can be used to study sounds within an automobile interior, from sources such as the engine and doors.




Tel: +1 (949) 493 8181Fax: +1 (949) 661 7231




prepolarized condenser microphonesEndevco prepolarized condenser measurement microphones are available in 1/8”, ¼”, and ½” diameters. Free-field, pressure, and random incidence types are available to meet the needs of your application. All Endevco microphones comply with the specifications of IEC 1094: Measurement Microphones, Part 4: Specifications for working standard microphones.

P/N EM40AE EM40AM EM40AD EM40Ao EM40AQ EM40BE EM40BD EM40DD

Diameter in (mm) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) 1/4 (6.35) 1/4 (6.35) 1/8 (3.18)

Type Free-field Free-field Pressure Pressure Random-incidence Free-field Pressure Pressure

Frequency range Hz 3.15 - 20K 3.15 - 40K 6.3 - 10K 3.15 - 20K 3.15 - 16K 10 - 100K 10 - 70K 6.5 - 140K

Dynamic range dB re 20 μPa 15 - 146 20 - 160 17 - 146 27 - 160 17 - 146 40 - 168 45 - 174 50 - 184

Nominal sensitivity mV/Pa 50 12.5 50 12.5 50 4 1.6 0.7

Capacitance pF 14.1 17 20 20 13.3 5.2 7 3

Polarization voltage V 0 0 0 0 0 0 0 0

Temperature range °F (°C) -40 to 302 (-40 to 150)14 to 122 (-10 to 50)

-40 to 248 (-40 to 120)

-40 to 302 (-40 to 150)

-40 to 302 (-40 to 150)

-40 to 302 (-40 to 150)

-40 to 248 (-40 to 120)

-40 to 248 (-40 to 120)

Length in (mm) 0.64 (16.2) 0.49 (12.5) 0.64 (16.2) 0.49 (12.5) 0.64 (16.2) 0.41 (10.5) 0.41 (10.5) 0.26 (6.7)

Weight oz (g) 0.23 (6.5) 0.25 (7) 0.32 (9) 0.25 (7) 0.23 (6.5) 0.06 (1.75) 0.07 (2) 0.05 (1.5)

Measurement microphones are used in environmental noise analysis to study sounds from sources such as airports, highways and construction zones. This analysis can give a better understanding of the sound levels experienced in these areas, allowing for the necessary adjustments to be made to comply with existing regulations and legislation.

Environmental noise analysis




Tel: +1 (949) 493 8181Fax: +1 (949) 661 7231




Model EM40PH

Model EM40PL

Model EM40PS

low-cost array and low-profile surface microphonesSpecial microphones are often required for testing conditions in which there are particular requirements surrounding the methods of measurements and configurations. Surface microphones are used for measurements on planar and curved surfaces. A typical application includes measurements of wind-induced noise on ground and airborne vehicles. Array microphones are used in applications where concurrent measurements are required at several points in an array. Typical applications include sound field analysis and sound power analysis.

P/N EM40PH EM40PL EM40PS

Diameter in (mm) 0.28 (7) 0.28 (7) 0.52 (13.2)

Type Array Array Surface

Frequency range Hz 10 – 20K 10 – 20K 20 – 20K

Dynamic range dB re 20 μPa 32 – 135 32 – 150 30 – 136

Nominal sensitivity mV 50 10 5

Polarization voltage V 0 0 0

Temperature range °F (°C) 14 to 122 (-10 to 50) 14 to 122 (-10 to 50) -4 to 176 (-20 to 80)

Plug type SMB coaxial socket SMB coaxial socket Microdot connector

Power supply mA 2 – 20 2 – 20 2 – 10

output impedance Ω < 50 < 50 < 50

Weight oz (g) 0.19 (5.5) 0.19 (5.5) 0.11 (3)

iTEDS capable Yes Yes Yes

isotron® preamplifiers for prepolarized microphonesOptimized for use with prepolarized condenser microphones, Endevco preamplifiers are delivered with a built-in iTEDS chip, and can be programmed as a single unit, pre-fitted with a microphone. All preamplifiers have a stainless steel casing for maximum strength and durability.

Model EM26CA

Model EM26CB

Model EM26CF

Model EM26CS

P/N EM26CA EM26CF EM26CB EM26CS

Diameter in (mm) 1/2 (12.7) 1/2 (12.7) 1/4 (6.35) 1/4 (6.35)

output connector BNC BNC Microdot 10-32 Microdot 10-32

Power supply mA 2 - 20 4 - 20 2 - 20 2 - 20

Frequency range Hz 2 – 200K 2.5 – 100K 2 – 200K 2 – 200K

Noise A-weighted μV rms < 2.5 10, typical < 2.5 < 2.5

output voltage maximum V ±8 ±5 ±8 ±8

Input impedance GΩ 20 20 20 20

output impedance Ω < 50 < 50 < 50 < 50

operating temperature °F (°C) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70)

gain, typical dB -0.25 -0.25 -0.25 -0.45

Length in (mm) 2.87 (73) 3.66 (93) 1.97 (50) 1.16 (29.5)

Weight oz (g) 0.92 (26) 1.06 (30) 0.28 (8) 0.12 (3.5)




Tel: +1 (949) 493 8181Fax: +1 (949) 661 7231




iteds microphonesEndevco EM46 series is a family of microphones and preamplifiers, pre-assembled and calibrated as a single unit, with the incorporation of iTEDS. These combination units have been carefully selected to obtain the best possible properties and reliability, thus optimizing workflow for the user and minimizing typical handling errors. The units are assembled in a dust-free environment to avoid contamination of the interface between the microphone and preamplifier and have been sealed with a label. The label can be removed and the kit dismantled, if desired by the user.

For measurement platforms that support intelligent transducers, according to IEEE 1451.4 (iTEDS), microphones may be simply plugged in, in order to identify their specific properties, types and calibration data—a feature especially appreciated by multi-channel users. All EM46 series units are delivered with calibration charts including sensitivity values and frequency response curves for the complete kit. The sensitivity value can therefore be used directly within the system setup.

P/N EM46AE EM46AM EM46AD EM46Ao EM46AQ EM46BD EM46BE

Diameter in (mm) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7) 1/4 (6.35) 1/4 (6.35)

Type Free-field Free-field Pressure Pressure Random-incidence Pressure Free-field

Frequency range Hz 3.15 - 20K 3.15 - 40K 3.15 - 10K 3.15 - 20K 3.15 - 12.5K 10 - 70K 10 - 100K

Dynamic range dB re 20 μPa 14.5 - 138 20 - 160 16 - 138 20 - 150 16 - 138 45 - 174 40 - 168

Nominal sensitivity mV/Pa 50 12.5 50 12.5 50 1.6 4

Polarization voltage V 0 0 0 0 0 0 0

Temperature range °F (°C) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70) -22 to 158 (-30 to 70)

Plug type BNC - coaxial BNC - coaxial BNC - coaxial BNC - coaxial BNC - coaxial BNC - coaxial BNC - coaxial

Power supply mA 2 - 20 2 - 20 2 - 20 2 - 20 2 - 20 2 - 20 2 - 20

output impedance Ω < 50 < 50 < 50 50 < 50 50 50

Length in (mm) 3.31 (84) 3.31 (84) 3.31 (84) 3.16 (80.3) 3.31 (84) 2.09 (53) 2.09 (53)

Weight oz (g) 1.16 (33) 1.16 (33) 1.23 (35) 1.16 (33) 1.23 (35) 0.28 (8) 0.28 (8)

Components EM40AE & EM26CA EM40AM & EM26CA EM40AD & EM26CA EM40AO & EM26CA EM40AQ & EM26CA EM40BD & EM26CB EM40BE & EM26CB




Tel: +1 (949) 493 8181Fax: +1 (949) 661 7231




AccessoriesAvailable Endevco acoustic accessories include adapters, windscreens, nose cones, and tripods for use in measuring set-ups.

precision handheld acoustic calibratorThe Endevco model EM42AA pistonphone is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters and other sound measuring equipment. The pistonphone is an extremely stable laboratory-standard sound source which can also be used for field calibrations, retaining its high accuracy even under hostile environmental conditions. It includes a coupler for calibrating ½-inch microphones as well as adapters for calibrating ¼-inch and 1/8-inch microphones.

P/N EM42AA

Application Calibration of measurement microphone, sound level meters and sound measuring equipment

Sound pressure level nominal 114 dB re. 20 μPa

Calibration accuracy dB ±0.08

Frequency Hz 250 ±0.5 %

Distortion < 1.5 %

Temperature range °C (°F) -10 to 55 (14 to 131)

Batteries Four standard AA alkaline cells

Length in (mm) 6.89 (175)

Width in (mm) 1.38 (35)

Height in (mm) 1.38 (35)

Weight lb (g) 0.7 (325)

P/N EMAM0069 EMAM0071 EMAM0364 EMRA0020 EMRA0022 EMRA0063 EMAL0012 EMAL0013

Description

Spherical set of five open-cell-structure foam windscreens for mounting on ½˝ microphones with standard protection grids when making acoustic measurements in windy or other airflow conditions. 90 mm in diameter.

Spherical set of five open-cell-structure foam windscreens for mounting on ¼˝ microphones with standard protection grids when making acoustic measurements in windy or other airflow conditions. 90 mm in diameter.

Set of six open-cell-structure foam windscreens for mounting on array microphones when making acoustic measurements in windy or other airflow conditions. 40 mm in diameter.

½˝ Nose cone for replacing the standard protection grid of a ½˝ microphone when making acoustic measurements in laminar airflow.

¼˝ Nose cone for replacing the standard protection grid of a ¼˝ microphone when making acoustic measurements in laminar airflow.

Adapter for using a 1/8˝ microphone with a ¼˝ preamplifier. It can be used with any standard 1/8˝ microphone and ¼˝ preamplifier such as the model EM26CB.

Tripod adapter for ½” microphones /preamplifiers

Tripod adapter for ¼” microphones /preamplifiers

acoustic measurement product selection guide endevco microphones, preamplifiers … · 2015. 1....

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