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Related Manuals for G.R.A.S. 43BA Series
Summary of Contents for G.R.A.S. 43BA Series
- Page 1 Instruction Manual 43BA ¼” 0.4cc High-frequency Coupler Kit 43BA-1 ¼” 0.4cc High-frequency Coupler Kit 43BA-2 ¼” 0.4cc CCP High-frequency Coupler Kit 43BA-3 ¼” 0.4cc CCP High-frequency Coupler Kit, High Sensitivity www.gras.dk LI0105 – 11 December 2013...
- Page 2 Revision History Any feedback or questions about this document are welcome at gras@gras.dk. Revision Date Description 11 December 2013 First publication Copyright Notice © 2013 G.R.A.S. Sound & Vibration A/S www.gras.dk Trademarks Product names mentioned in this document may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.
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Page 3: Table Of Contents
Contents Introduction and Description ............4 Design ...................... 4 Performance ....................5 Delivered Items ................7 Assembling the Coupler ..............9 Mounting and Dismounting the Microphone ........10 Calibration ................. 10 Ordering Information ..............11 Specifications and Warranty ............13 Specifications .................. -
Page 4: Introduction And Description
Introduction and Description The G.R.A.S. 43BA is a ¼” 0.4cc High-Frequency coupler made for and with the hearing aid industry. Compared to the reference 2cc coupler it has a smaller volume and a ¼” microphone. It retains the advantages of the 2cc coupler, but adds the capability of delivering differentiated and precise data up to 16 kHz because of the combination of the smaller volume and the ¼”... -
Page 5: Performance
Performance An important benefit of the small volume and the ¼” microphone is the fact that the resonance frequency at 30 kHz is so high that it does not interfere with measurements in the audible frequency range. Therefore it can be used for measurements up to 16 kHz, one octave higher than achievable with the reference 2cc coupler. - Page 6 As can be seen in Fig. 1, the 0.4cc coupler does not produce the very sharp resonance at about 12 kHz typical of the 2cc coupler (dotted line). The 0.4cc coupler’s high frequency behavior is much more linear and does therefore not degrade the reproducibility of high frequency measurements.
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Page 7: Delivered Items
GR0924 RA0045 40AG GS0158 Delivered Items GR1153 GR1440B 26AS 45EA GR0917 Delivered Items GR0010 26AS GR1440B GR0917 GR1440B 26AS GR0917 G.R.A.S. 43BA-1 ¼” LEMO 0.4cc High-frequency Coupler Kit 46BP 46BD ¼” Ext. Polarized ¼” LEMO Preamplifier Pressure Microphone with Integrated Cable, Very Short 40BP GR0924... - Page 8 GR0924 RA0045 40AG RA0045 GS0158 40AG GS0158 GR1153 GR1153 Delivered Items GR001 GR0010 26AS GR1440B G.R.A.S. 43BA-3 ¼” CCP 0.4cc High-frequency Coupler Kit, High Sensitivity GR0917 46BP 46BP 46BD 46BD ¼” Ext. Polarized ¼” CCP Preamplifier Pressure Microphone, with Microdot High Sensitivity Connector, Very Short 40BL...
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Page 9: Assembling The Coupler
Assembling the Coupler You can assemble the coupler to suit the type of hearing aids you want to test. Union Nut B-B ( 5 : 1 ) Venting canal End stop O-ring Coupler Housing Locking mechanism and lever Fig. 3. Cross section of the RA0252 coupler without adapter. In-ear Adapter RA0272 ¼”... -
Page 10: Mounting And Dismounting The Microphone
Mounting and Dismounting the Microphone The microphone can easily be inserted and removed using the locking mechanism lever on the side of the coupler body. 1. Ensure that the locking mechanism is unlocked. 2. Gently push in the microphone assembly until it touches the end stop and will go no further. 3. -
Page 11: Ordering Information
Ordering Information G.R.A.S ¼” 0.4cc High-Frequency Coupler Included Items Part Number 0.4cc Coupler including Union Nut RA0252 G.R.A.S. 43BA-1 ¼” LEMO 0.4cc High-frequency Coupler Kit Included Items Part Number RA0252 0.4cc Coupler including Union Nut 40BP ¼” Ext. Polarized Pressure Microphone ¼”... - Page 12 G.R.A.S. 43BA-3 ¼” CCP 0.4cc High-frequency Coupler Kit, High Sensitivity Included Items Part Number 0.4cc Coupler Housing, including Union Nut RA0252 ¼” Prepolarized Pressure Microphone, High Sensitivity 40BL ¼” CCP Preamplifier, Very Short 26CS Ear-mould Adapter Kit for RA0038 / RA0252 Couplers RA0270 RA0272 In-ear Adapter for RA0038 / RA0252 Couplers...
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Page 13: Specifications And Warranty
Specifications and Warranty Specifications RA0252 Coupler Volume 400 mm ±2% Resonance Frequency 30 kHz Weight, g 43BA-1 Microphone Set 40BP + 26AS Set sensitivity mv/Pa dB re 1 V/Pa -56.5 Resonance frequency 30 kHz Theoretical dynamic range with 40BP + 26AS 39 dB(A) to 172 dB Temperature range, °C -30 to 60... -
Page 14: Calibration
Calibration The 43BA is delivered with • a calibration chart specifying its exact volume. • a calibration chart for the microphone/preamplifier combination. We recommend a yearly recalibration at minimum, depending on the use, measurement environ- ment, and internal quality control programs. Warranty All G.R.A.S.