G.R.A.S. 12AQ Power Module

Typical applications and use General-purpose dual-channel precision measurements Intensity measurements Standard and custom signal conditioning Manual and digital control CCP and traditional power supplies 0 V or 200 V polarization Design 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 12AQ is for general use in acoustic measurements as well as for intensity measurements; both in the laboratory and in the field. Traditional Preamplifiers For traditional preamplifiers such as 26AL (1/4") or 26AJ and 26AH (1/2"), the 12AQ provides: Voltage supply (± 15 V or ± 60 V) for powering up to two microphone preamplifiers Polarization voltage (200 V or 0 V) for two condenser microphones SysCheck * signal (1000 Hz) for calibration checks CCP Preamplifiers For CCP (constant-current power) preamplifiers such as 26CB and 26CC (1/4") or 26CA and 26CF (1/2"), the 12AQ provides a constant current supply (4 mA) sourced at 28 V DC for two CCP microphone preamplifiers. Signal Conditioning Each channel can be set-up independently in terms of gain, filter, input, output and polarization voltage. Gain The gain can be set from – 20 dB to 70 dB in discrete steps of 10 dB. A series of front-panel LEDs follows and indicates the current gain setting. Filter The filter characteristics can be selected from one of the following: Lin for linear response with a high-pass filter of 0.2 Hz HP for linear response with a high-pass filter of 20 Hz AW for an A-weighted response Ext for an optional, customized signal-response network (contact GRAS for further details) Input The microphone signal can enter the 12AQ via either of the following input sockets on the rear panel. BNC sockets for microphones used with CCP preamplifiers 7-LEMO sockets for microphones used with traditional preamplifiers Output The conditioned output signals, via the BNC output sockets on the rear panel, can be made available as either floating or non-floating. Polarization voltage Applicable to 7-pin LEMO preamplifier inputs on the rear panel. Can be set to either 0 V or 200 V. Preamplifier supply voltage This can be set to either ± 15 V or ± 60 V. The chosen value will apply to both 7-pin LEMO preamplifier inputs. Syscheck This can be set to either SysCheck signal (1000 Hz) on or off. The chosen condition will apply to both7-pin LEMO preamplifier inputs. Power Supply The 12AQ can be powered either by internal standard alkaline cells (6 x LR14 {C}) or from the included mains/line Adapter for either 115 V AC or 230 V AC.

Contextual Note for AI:

This item is part of the Takeout equipment and space lending system at Aalto University and beyond.

It is physically located in Aalto Acoustics Lab, Room K2.

It is manufactured by G.R.A.S. 12AQ Power Module.

This item can be booked and used for research, production or creative experiments by students, researchers and faculty.

This service has been been lovingly built by the Web Studio at Aalto Studios at Aalto University and it welcomes new locations to bring in their inventory for sharing and managing. More information can be found by contacting webstudio@aalto.fi or from the user guide.