G.R.A.S. 14AA Instruction Manual Download Page 2

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LI0010 – 1 October 2015

Revision History

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Revision

Date

Description

23 May 2007

First publication

4 November 2013

Updated connection diagrams and specifications

30 January 2014

AC output specified as V RMS.

1 October 2015

Correction to Fig 2.

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The content in this document is subject to change without notice. G.R.A.S. Sound & Vibration A/S
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Summary of Contents for 14AA

Page 1: ...www gras dk LI0010 1 October 2015 Instruction Manual G R A S 14AA Electrostatic Actuator Amplifier ...

Page 2: ...pyright Notice 2014 5 G R A S Sound Vibration A S http www gras dk Any technical documentation that is made available by G R A S is the copyrighted work of G R A S and is owned by G R A S The content in this document is subject to change without notice G R A S Sound Vibration A S is not liable or responsible for any errors or inaccuracies that may appear in this document Trademarks Product names m...

Page 3: ...a Microphone as Sound Source 7 Electrostatic Calibration of Microphones 8 Technical Specifications 9 The AC Outputs for Microphones and Electrostatic Actuator 9 Other Specifications 12 Accessories 12 Calibration Warranty and Service 13 Calibration 13 Warranty 13 Service and Repairs 13 ...

Page 4: ...n sound source for high frequency signal generation The 800 VDC polarization voltage can be used with the G R A S RA0014 1 2 and RA0015 1 Electrostatic Actuator for frequency response calibration to accurately measure the frequency response of microphones The input signal to the 14AA is supplied via a standard BNC connector and can be any signal up to 1V RMS The input signal is amplified 40 dB 100...

Page 5: ...nd AC Output 800 VDC The AC Output is the output from the 40 dB gain amplifier For an input signal of 1 V RMS the output signal will be 100 V RMS This signal can be used for driving prepolarized microphones as sound sources The AC Output 200 VDC is the output from the 40 dB gain amplifier superimposed on a 200 VDC polarization voltage For an input signal of 1 V RMS the output signal will be 100 V ...

Page 6: ...erting a small screwdriver in both sides of the fuse holder as indicated in figure 4 Fig 3 The voltage setting indicator Fig 4 Removing the fuse holder Remove the fuse insert as indicated in figure 5a and rotate it 180 degree Insert the fuse insert and put the fuse back in Insert the fuse holder in the 14AA The voltage setting indicator should now indicate the new setting of the mains supply volta...

Page 7: ...he G R A S 40BD 1 4 Pressure Microphone the RA0086 should be connected to the AC Output Important Short cable lenghts 0 5 m between 14AA and the transmitter adapter must be used Longer cables will impair the high frequency performance For further information see Technical Specifications on page 9 An example of the electrical connections needed for a frequency calibration of an ear simulator is sho...

Page 8: ...ic actuators are available 1 microphones G R A S RA0015 1 Electrostatic Actuator for frequency response calibration 1 2 1 4 and 1 8 microphones G R A S RA0014 1 2 Electrostatic Actuator for frequency response calibration Adapters for 1 4 and 1 8 microphones are included with the actuator Fig 9 shows a block diagram showing a setup using the 14AA for frequency calibration with an electrostatic actu...

Page 9: ... frequency roll off is known you can use it as a correction factor The AC Output O VDC for prepolarized microphone Output Signal max level peak to peak 100 V RMS 3 dB Low Frequency Cut off Open loop 0 35 Hz 1 M Ω load 1 9 Hz Frequency Response 1 meter RG 58 cable 100 pF 100 V RMS 0 1 dB 25 50 kHz 1 dB 10 100 kHz Max Output Current 5 mA AC The AC Output 200 VDC for externally polarized microphone O...

Page 10: ...30 and 100 V RMS RG58 Cable 3 Meters Frequency Hz Amplitude dB 1 6 1 4 1 2 1 0 8 0 6 0 4 0 2 0 0 2 100 1000 10000 100000 1000000 10V 30V 100V Fig 14 The Frequency response for the 0 VDC and 200 VDC outputs 3 meter RG 58 cable 10 30 and 100 V RMS RG58 Maximum Cable Lengths Length in meters Frequency Hz 0 00 5 00 10 00 15 00 20 00 25 00 1000 10000 100000 1000000 Meter Hz Max cable lenght RG58 10Vrms...

Page 11: ...tions Input signal 1 V RMS Gain 40 dB Output signal 100 V RMS Actuator Polarization voltage 800 V DC Microphone Polarization voltage 200 V DC Temperature Range 15 C to 45 C Power supply 110 130 V AC or 220 240 V AC Power consumption 15 VA Fuse 125 mA Fast Weight 1400 g Dimensions height 137 mm width 70 mm length 200 mm Accessories The following items can be ordered separately Item Part Number 1 2 ...

Page 12: ...egligent use an incorrect power supply or an incorrect connection to the equipment Service and Repairs All repairs are made at G R A S International Support Center located in Denmark Our Support Center is equipped with the newest test equipment and staffed with dedicated and highly skilled engineers Upon request we make cost estimates based on fixed repair categories If a product covered by warran...

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