Features

Features GRAS 12AN 4-Channel Power Module

The special features of the 12AN Power Module make it suitable for general use. The input signal is coupled to the output without any filtering or an A-weighting network. Because of this, the 12AN Power Module is ideally suited for infra-sound measurements. The low-frequency cut-off at 0.05 Hz is so low that it will not be the limiting factor in infra-sound measurements. A suitable microphone system for this application is the combination of the GRAS 40AN 1/2" Free-field microphone, low frequencies and the matching preamplifier, the GRAS 26HG 1/4" Preamplifier, High Impedance. The polarization voltage is very stable and the sensitivity of the microphone is therefore kept very stable. For this reason, the 12AN Power Module is well suited for microphone calibration. The 12AN Power Module has four channels for multi-channel measurements and calibration setups requiring more than one channel. You can operate the 12AN Power Module on batteries or an external DC power supply. A battery indicator monitors the battery condition.