Power modules

Power modules

Why a Power Module?

An externally polarized condenser measurement microphone cannot work on its own.  It needs to be connected to hardware that can act as an interface between the raw signal output and the data acquisition unit or measurement device. The Power Module is such an interface that improves the performance and reliability of the measurement chain.

  • It provides polarization voltage for the transducer, ensuring that the microphone gets the charging voltage it needs.
  • It provides supply voltage for the microphone preamplifier. The preamplifier acts as a unity gain impedance converter. It provides a certain amount of line drive capability by providing a low output impedance and output current,  making it possible to transmit the signal from the transducer to the Power Module without significant degradation.
  • A power module can provide amplification or attenuation to the signal, thus making it possible to fine tune the measurement chain to the signals being measured and the  hardware being used.
  • Selectable filters make it possible to exclude unwanted noise from the measurement, e.g. wind induced noise from outdoor measurements.
  • Overload detection makes it possible to validate the measurements and is a useful tool in monitoring setups.
  • When a Power Module with gain is used, you can use longer cables because of the power module's ability to deliver current.
  • A Power module introduces electrical isolation
  1. 12AL 1-Ch CCP Power Module with A-weighting filter
    Connection: CCP
    Channel(s): 1

    G.R.A.S. 12AL 1-Channel CCP Power Module with A-weighting filter

    The G.R.A.S. 12AL CCP (Constant Current Power) Supply is a low-noise single-channel power supply for CCP transducers and preamplifiers.

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  2. 12AQ 2-Ch Universal Power Module, signal cond, remote
    Connection: Traditional 200 V / CCP
    Channel(s): 2

    G.R.A.S. 12AQ 2-Channel Universal Power Module with signal conditioning and PC interface

    The G.R.A.S. 12AQ Power Module is a dual-channel power supply for preamplifiers (CCP as well as traditional) used with measurement, condenser microphones.

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  3. 12AG 8-Ch Power Module, gain, filters and SysCheck
    Connection: Traditional 200 V
    Channel(s): 8

    G.R.A.S. 12AG 8-Channel Power Module with gain, filters and SysCheck generator

    The G.R.A.S. Power Module 12AG is an 8-channel power supply for preamplifiers used with condenser microphones. It is for use in multichannel acoustic measurements in both laboratory and field.

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  4. 12AA 2-Ch Power Module, gain, filters and SysCheck
    Connection: Traditional 200 V
    Channel(s): 2

    G.R.A.S. 12AA 2-Channel Power Module with gain, filters and SysCheck generator

    The G.R.A.S. 12AA Power Module is a dual channel power supply for preamplifiers used with condenser microphones. It 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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  5. 12AK 1-Ch Power Module, gain, filters and SysCheck
    Connection: Traditional 200 V
    Channel(s): 1

    G.R.A.S. 12AK 1-Channel Power Module with gain, filters and SysCheck generator

    The G.R.A.S. 12AK is a single-channel power module with a 7-pin LEMO 1B connector for power and polarization of an externally polarized microphone set. It features SysCheck, instantaneous and latched overload indication, adjustable gain settings, A-weighting, and Lin and HP filters. These features make the 12AK the ideal choice for a wide range of applications such as monitoring, laboratory use, and sound level meter measurements.

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  6. 12AR 2-Ch Power Module
    Connection: Traditional 200 V
    Channel(s): 2

    G.R.A.S. 12AR 2-Channel Power Module

    The G.R.A.S. 12AR Power Module is a dual-channel power supply for preamplifiers used with condenser microphones. It is for general use in acoustic measurements; both in the laboratory and in the field.

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  7. 12AN 4-Ch Power Module
    Connection: Traditional 200 V
    Channel(s): 4

    G.R.A.S. 12AN 4-Channel Power Module

    The G.R.A.S. 12AN 4-Channel Power Module is a four-channel power module with 7-pin LEMO 1 B connectors for externally polarized measurement microphone sets. The inputs are AC-coupled directly to the outputs for a flat frequency response down to 0.05 Hz. It provides the basic features for powering condenser measurement microphones.  The polarization voltage can be selected to 200 V for externally polarized microphones or 0 V for prepolarized microphones. The supply voltage for the preamplifiers is ±15 V.

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  8. 12AD 1-Ch Power Module
    Connection: Traditional 200 V
    Channel(s): 1

    G.R.A.S. 12AD 1-Channel Power Module

    The G.R.A.S. 12AD Power Module is a single-channel power supply for preamplifiers used with condenser microphones. It is for general use in acoustic measurements; both in the laboratory and in the field.

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  9. 12HF 1-Ch Power Module for Lownoise Systems
    Connection: Traditional 200 V
    Channel(s): 1

    G.R.A.S. 12HF 1-Channel Power Module for Lownoise Systems

    The G.R.A.S. Power Module 12HF is a power supply for single-channel, lownoise measurements using the matched, low-noise preamplifiers and high-sensitive microphones of a G.R.A.S. low-noise measuring system 40HF, 40HH or 40HT.

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  10. 12HM 10-Ch Power Module for Lownoise Systems
    Connection: Traditional 200 V
    Channel(s): 10

    G.R.A.S. 12HM 10-Channel Power Module for Lownoise Systems

    The G.R.A.S. Power Module 12HM is a 10-channel power supply for multi-channel lownoise measurements using the matched, low-noise preamplifiers and high-sensitive microphones of a G.R.A.S. 40HF, 40HH or 40HT Lownoise Measuring System.

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  11. 12AB Intensity Power Module
    Connection: Traditional 200 V
    Channel(s): 2

    G.R.A.S. 12AB 2-Channel Power Module for G.R.A.S. Intensity Probes

    The G.R.A.S. 12AB Intensity Power Module is a two channel power supply for use with versions B, C and D of the G.R.A.S. 50AI Sound IntensityProbe.

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  12. 12AC 6-Ch Power Module, Vector-intensity Probe
    Connection: Traditional 200 V
    Channel(s): 6

    G.R.A.S. 12AC 6-Channel Power Module for G.R.A.S. Vector-intensity Probe

    G.R.A.S. 12AC 6-Channel Power Module for G.R.A.S. Vector-intensity Probe Learn More
  13. 12AU 1-Ch Universal Power Module, signal cond, power amp
    Connection: Traditional 200 V / CCP
    Channel(s): 1

    G.R.A.S. 12AU 1-Channel Universal Power Module with signal conditioning and power amplifier

    The G.R.A.S. 12AU is a supply and conditioning amplifier for simultaneously powering a preamplifier for a condenser microphone and an amplifier for a loudspeaker. It is ideally suited for automated production line testing of micro speakers and mobile devices with built-in speaker.

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