BRUEL & KJAER 4185 User Manual Download | Manualshive

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USER MANUAL

Ear

Simulator

for

Telephonometry

Type

4185

BR 2309 – 11
English

©

Brüel

&

Kjær.

All

rights

reserved.

ËBR

-2

309

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CÎ

B

R

230

9

–

11

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Summary of Contents for 4185

Page 1: ...USER MANUAL Ear Simulator for Telephonometry Type 4185 BR 2309 11 English www bksv com Br el Kj r All rights reserved BR 2309 C BR 2309 11...

Page 2: ......

Page 3: ...BR 2309 11 September 2015 www bksv com Ear Simulator for Telephonometry Type 4185 User Manual...

Page 4: ...The apparatus will be marked with this symbol when applicable Alternating Current The apparatus will be marked with this symbol when applicable Danger Signals an imminent hazardous situation which if...

Page 5: ...batteries as unsorted municipal waste It is your responsibility to contribute to a clean and healthy environment by using the appropriate local return and collection systems Hazardous substances in el...

Page 6: ...se of or reliance upon any of the content of this document regardlessof whethersuchcontent has been accurate or complete Br el Kj r will not pay any damages whether for loss or injury punitive or othe...

Page 7: ...Response 6 2 3 Absolute Sensitivity 8 2 4 Calibrating Type 4185 9 CHAPTER 3 Handling the Ear Simulator 11 3 1 Assembling Type 4185 11 3 2 Adjusting the Ear Simulator Force 12 3 3 Protecting the Ear S...

Page 8: ......

Page 9: ...IEC 60318 1 coupler Type 4185 converts the acoustic signal from an earphone into an electrical equivalent that takes into account the response of the human ear It enables electroacoustic measurements...

Page 10: ...heminiaturesoundsource A 4 Soft Seal YJ 0431 B Adaptor Sleeve for Acoustic Coupler DB 1164 C Microphone Cable AO 0419 LEMO to LEMO D CondenserMicrophoneType4192attachedto Microphone Preamplifier Type...

Page 11: ...n external signal to produce a sound pressure inside the main cavity If the seal between the coupler and handset is poor the sound pressure measured by the microphone will be considerably lower at low...

Page 12: ...mounted in the upper main plate of the test head in a spring loaded mechanism that gives a well defined and adjustable force against the earcap This design together with the soft seal on Type 4185 is...

Page 13: ...s defined as the acoustic input impedance of the ear simulator seen from the ear reference point ERP the reference point for telephone measurements in most telephone standards It is measured using a s...

Page 14: ...ed to 0 dB at 1 kHz The response is measured under open ear conditions by mounting the artificial ear in a large plane baffle and exposing it to a plane wave incident perpendicular to the baffle The s...

Page 15: ...as a correction function measurements made on any telephone handset are by division with the frequency sensitivity response referred to the equivalent sound pressure at the ERP This is required to cal...

Page 16: ...be verified using Sound Calibrator Type 4231 Normally the calibration level P4231 produced by Type 4231 mounted on a microphone is 94 dB SPL but if an extra volume is added caused for instance by the...

Page 17: ...r P open closed to take into account the change in sensitivity when going from closed ear to open ear conditions Thecorrectedcalibrationleveltoobtaintheopen earsensitivityisthen given by P4231 correct...

Page 18: ...ation levels for Sound Calibrator Type 4231 Calibrating the Microphone with Sound Calibrator Type 4231 To calibrate the microphone ensure that the standard green adaptor UC 0210 is inserted in the mid...

Page 19: ...and preamplifier as follows 1 Insert Preamplifier Type 2669 into Adaptor Sleeve DB 1164 at the adaptor sleeve s small end 2 Screw Microphone Type 4192 onto the preamplifier body so that the adaptor s...

Page 20: ...or force until maximum output from the microphone in the ear simulator is detected 3 With the measurement equipment set up measure the frequency response repeatedly and adjust the ear simulator force...

Page 21: ...ainst dust that could otherwise block the small holes in the coupler and the microphone and affect the performance 3 4 More Information For more helpful hints in using Br el Kj r ear simulators for te...

Page 22: ...More Information 14 Ear Simulator for Telephonometry Type 4185 User Manual...

Page 23: ...ions to show the effect of the acoustic loading presented by the ear simulator The cross section in Fig 4 1 shows the physical construction of Acoustic Coupler UA 1110 and the associated electrical co...

Page 24: ...ar simulator it constitutes a compromise between complexity good simulation of reality and simplicity poorer simulation of reality As a consequence some of the component values have been adapted to gi...

Page 25: ...r Telephonometry Type 4185 User Manual Fig 4 3 Simulated acoustic impedance for Type 4185 compared to a typical measured impedance curve 970375e 100 200 500 1k 2k 5k 10k Hz 100 110 120 130 140 150 dB...

Page 26: ...Equivalent Diagrams 18 Ear Simulator for Telephonometry Type 4185 User Manual...

Page 27: ...uded COUPLER ACOUSTIC EQUIVALENT VOLUME 4 2 cc PINNA TYPE Simplified DIMENSIONS of coupler and preamplifier Length 103 mm 4 06 Max Diameter 60 mm 2 4 WEIGHT of coupler 332 g 11 7 oz Miniature Sound So...

Page 28: ...measuring and test equipment EMC Emission EN IEC 61000 6 3 Generic emission standard for residential commercial and light industrial environments CISPR 22 Radio disturbance characteristics of informa...

Page 29: ...ee ITU T Rec P 50 BSI British Standards Institution Capsule Term used to refer to the transmitter microphone or earphone transducer when separated from a handset ITU T Abbreviation for International T...

Page 30: ...point at the entrance of the listener s ear occupied by the centre of a telephone earcap This point is used as the origin in handset positioning specifications Handset A rigid assembly for holding bot...

Page 31: ...for objective measurement of telephone transmission performance A single figure representing the loss is indicated on a special meter Receiver In a telephone system the transmission path from the tele...

Page 32: ...Simulator for Telephonometry Type 4185 User Manual STMR Sidetone Masking Rating A single figure measure of telephonesidetonepathlosscalculatedasaloudnessrating from a sidetone measurement Transmit Se...

Page 33: ......

Page 34: ...USER MANUAL Ear Simulator for Telephonometry Type 4185 BR 2309 11 English www bksv com Br el Kj r All rights reserved BR 2309 C BR 2309 11...

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