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G.R.A.S. Sound & Vibration >
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Power Modules
G.R.A.S. has developed and manufactures a range of precision power modules to complement the capabilities of your microphones and pre-amplifiers:
Click on images for details:
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| Constant Voltage : : G.R.A.S. Sound & Vibration |
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Type 12AA Input Channels: 2 x 7-pin LEMO 1B connectors Output channels: 2 x BNC sockets Gain settings: -20 dB, 0 dB, +20 dB, +40 dB Preamplifier supply: 28 V or 120 V Polarisation voltage: 0 V or 200 V Frequency response: 3.5 Hz - 200 kHz A-weighted network: IEC 60651 Type 0 Output impedance: 30 Ohm Power supply: 10 x AA alkaline batteries or 12 - 18 V DC mains/line adaptor for 220/115 V Comment: Built-in 1 kHz precision calibration generator with adjustable levels for both channels. |
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Type 12AB Input Channels: 2 via a 12-pin LEMO 1B connector Output channels: 2 x BNC sockets and one 9-pin D-sub socket Preamplifier supply: 28 V or 120 V Polarisation voltage: 0V or 200 V Frequency response: 0 Hz - 200 kHz Power supply: 10 x AA alkaline batteries or 12 - 18 V DC mains/line adaptor for 220/115 V Comment: Intensity Power Module for sound intensity probe Type 50AI |
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Type 12AD Input Channels: 1 x 7-pin LEMO 1B connector Output channels: 1 x BNC socket Preamplifier supply: ±15 V Polarisation voltage: 0 V or 200 V Frequency response: 0.05 Hz - 200 kHz Power supply: 4 x AA alkaline batteries or 4.5 - 24 V DC Comment: portable, compact power module |
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Type 12AG Input Channels: 8 x 7-pin LEMO 1B connectors Output channels: 8 x BNC sockets and 2 x VXI sockets Gain settings: 0 dB, +10 dB, +20 dB, +30 dB, +40 dB, +50 dB Preamplifier supply: 28 V or 120 V (4-channel groups) Polarisation voltage: 0 V or 200 V (4-channel groups) Frequency response: 3.5 Hz - 200 kHz A-weighted network: IEC 60651 Type 0 and IEC 61672 Class 1 Output impedance: 30 Ohm Power supply: 110 - 240 V AC / 100 mA with 8 G.R.A.S. preamplifiers at 120 V Comment: For multichannel acoustical measurements |
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Type 12AK Input Channels: 1 x 7-pin LEMO 1B connector Output channels: 1 x BNC socket Gain settings: 0 dB, +10 dB, +20 dB, +30 dB, +40 dB, +50 dB Preamplifier supply: 28 V or 120 V Polarisation voltage: 0 V or 200 V Frequency response: 3.5 Hz - 200 kHz A-weighted network: IEC 60651 Type 0 Output impedance: 30 Ohm Power supply: 10 x AA alkaline batteries or 12 - 18 V DC mains/line adaptor for 220/115 V Comment: Built-in 1 kHz precision calibration generator with an adjustable level |
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Type 12AN Input Channels: 4 x 7-pin LEMO 1B connectors Output channels: 4 x BNC sockets Preamplifier supply: ±15 V Polarisation voltage: 0 V or 200 V Frequency response: 0.5 Hz - 200 kHz Output impedance: 30 Ohm Power supply: 4 x AA alkaline batteries or 6 - 20 V DC mains/line adaptor for 220/115 V Comment: Portable, battery operated |
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Type 12AP Preamplifier Section: Input: 1 x 7-pin LEMO 1B connector Output channels: 1 x BNC socket Gain*:0 - 40 dB Output Impedance: 100 Ohm Bandwidth: 1 Hz - 200 kHz Noise floor (rel. input): 6 µV RMS 20 - 20 kHz Polarisation Voltage*: 0 V or 200 V High-pass filter*: 1 Hz/20 Hz Overload Detection*: red LED Speaker-amplification Section: Input: 1 x BNC connector Output: 1 x coaxial LEMO connector Input impedance: 10 kOhm Current output*: 1 x BNC connector Gain*: -20 to +10 dB Bandwidth (-3 dB): DC to 80 kHz Phase shift (in/output) ±1°: DC to 30 kHz Max. output voltage: ±14 V Max. output current: ±1.4 A Overload detection*: red LED Power supply: 110 V AC or 240 V AC Comment: Power supply and conditioning amplifier for simultaneously powering a preamplifier for a condenser microphone and an amplifier for a loudspeaker * Remote controlled |
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Type 12AR Input Channels: 2 x 7-pin LEMO 1B connectors Output channels: 2 x BNC sockets Preamplifier supply: ±15 V Polarisation voltage: 0 V or 200 V Frequency response: 0.05 Hz - 200 kHz Power supply: 4 x AA alkaline batteries or 4.5 - 24 V DC Comment: Portable, battery operated |
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Type 12AQ Traditional preamp. inputs: Connectors: 7-pin LEMO 1B Power supply: ±15 V or ±60 V Polarization: 0 V or 200 V CCP inputs: Connectors: BNC coaxial Power supply: 4 mA sourced at 28 V DC Signal inputs: Connectors: BNC coaxial Impedance: 100 Ohms Output: Floating or non-floating Overload level: 9 V peak Gain: -20 dB to 70 dB in discrete steps of 10 dB Filters: Lin: HP filter 0.56 Hz, -1 dB (2nd order) HP: HP filter 20 Hz, -3dB (butterworth 3rd order) AW: A-weighting, IEC 61650 type 0 Ext.: Optional customised signal-response network SysCheck: Output: Sinusoidal Frequency: 1,000 Hz Level adjustable: 0 - 5.6 V rms Control interface: Interface to host. Smart RS232, MSG line Power supply: Internal batteries: 6 x LR14 (C) alk. cells External power: 8 - 18 V DC Comment: Constant Current & Constant Voltage 2 channels Remote or manual control Each channel independent |
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Measurement microphones and preamplifiers require special voltages for supply and polarisation.
Acoustic measurements also often require special networks such as A-weighting or high-pass filtering; amplification or attenuation of the signal may also be necessary. These facilities are provided by the G.R.A.S. Power Modules.
Standard externally-polarised condenser microphones require a stable polarisation voltage of 200 V DC for proper operation. This may be turned off in the power modules for use with prepolarised microphones.
Low frequency acoustic signals generated, for example, by wind flow may overload the input section of the analyzer etc. This can be avoided by removing frequencies below 20Hz with the high pass filter in the power module.
The A-network is the most frequently used frequency weighting method in acoustics. This approximates the sensitivity of the human ear, and the result is a measurement of the noise as perceived by the human ear.
The G.R.A.S. Power Module Type 12AQ is a dual-channel power supply for preamplifiers (CCP as well as traditional) used with measurement, condenser microphones.
It has facilities for both manual control and remote control. Manual control is via its front-panel switches and push buttons. Remote control is via its RS232 interface.
The Type 12AQ is for general use in acoustic measurements as well as for intensity measurements; both in the laboratory and in the field.
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| Low Noise Measurement : : G.R.A.S. Sound & Vibration |
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Type 12HF Input Channels: 1 x 7-pin LEMO 1B connector Output channels: 1 x BNC socket Output impedance: 30 Ohm Polarisation voltage: 200 V Power supply: 4 x LR14 (C) internal cells or an external supply of 6 - 20V DC Comment: Power supply for single-channel, low-noise measurements using the matched, low-noise preamplifiers and high-sensitive microphones of a G.R.A.S. low-noise measuring system. |
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Type 12HM Input Channels: 10 x 7-pin LEMO 1B connectors Output channels: 10 x BNC sockets Output impedance: 30 Ohm Polarisation voltage: 200 V Gain adjustment/channel: ±3 dB Channel separation: >90 dB Power supply: 115 or 230V AC, max. 35 VA Comment: Power supply for multi-channel, low-noise measurements using the matched, low-noise preamplifiers and high-sensitive microphones of a G.R.A.S. low-noise measuring system. |
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These are dedicated power modules for use only in G.R.A.S. low-noise level microphone systems.
They provide polarisation and supply voltages for powering the special low-noise microphones and preamplifiers of these low-noise systems as well as the network for selecting a response setting of either pressure or free field.
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Want to learn more or place an order? Contact us .
Other G.R.A.S. Sound and Vibration products
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ETMC Technologies Pty Ltd Macarthur House, 8 Melville Street, Parramatta NSW 2150, AUSTRALIA
p: 02 9555 1225 (+61 2 9555 1225) f: 02 8014 5198 (+61 2 8014 5198) e: contact@etmc.com.au
© 2009-2011, ETMC Technologies Pty Ltd All rights reserved
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