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
GRAS 12AA 2-Channel Power Module with gain, filters and SysCheck generator

Connection:
Traditional 200 V
Channel(s): 2

GRAS 12AA 2-Channel Power Module with gain, filters and SysCheck generator

The GRAS 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...

GRAS 12AB 2-Channel Power Module for GRAS Intensity Probes

Connection:
Traditional 200 V
Channel(s): 2

GRAS 12AB 2-Channel Power Module for GRAS Intensity Probes

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

GRAS 12AC 6-Channel Power Module for GRAS Vector-intensity Probe

Connection:
Traditional 200 V
Channel(s): 6

GRAS 12AC 6-Channel Power Module for GRAS Vector-intensity Probe

GRAS 12AC 6-Channel Power Module for GRAS Vector-intensity Probe..

GRAS 12AD 1-Channel Power Module

Connection:
Traditional 200 V
Channel(s): 1

GRAS 12AD 1-Channel Power Module

The GRAS 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...

GRAS 12AG 8-Channel Power Module with gain, filters and SysCheck generator

Connection:
Traditional 200 V
Channel(s): 8

GRAS 12AG 8-Channel Power Module with gain, filters and SysCheck generator

The GRAS 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...

GRAS 12AK 1-Channel Power Module with gain, filters and SysCheck generator

Connection:
Traditional 200 V
Channel(s): 1

GRAS 12AK 1-Channel Power Module with gain, filters and SysCheck generator

The GRAS 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 ..

GRAS 12AL 1-Channel CCP Power Module with A-weighting filter

Connection: CCP
Channel(s): 1

GRAS 12AL 1-Channel CCP Power Module with A-weighting filter

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

GRAS 12AN 4-Channel Power Module

Connection:
Traditional 200 V
Channel(s): 4

GRAS 12AN 4-Channel Power Module

The GRAS 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 conden..

GRAS 12AQ 2-Channel Universal Power Module with signal conditioning and PC interface

Connection:
Traditional 200 V / CCP
Channel(s): 2

GRAS 12AQ 2-Channel Universal Power Module with signal conditioning and PC interface

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

GRAS 12AR 2-Channel Power Module

Connection:
Traditional 200 V
Channel(s): 2

GRAS 12AR 2-Channel Power Module

The GRAS 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...

GRAS 12AU 1-Channel Universal Power Module with signal conditioning and power amplifier

Connection:
Traditional 200 V / CCP
Channel(s): 1

GRAS 12AU 1-Channel Universal Power Module with signal conditioning and power amplifier

The GRAS 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...

GRAS 12AX 4-Channel CCP Power Module with Gain

Connection:
CCP Channels: 4
Gain: 0, 20, 40 dB

GRAS 12AX 4-Channel CCP Power Module with Gain

The GRAS 12AX CCP (Constant Current Power) Supply is a low-noise 4-channel power supply for CCP microphone sets...