Power Module Type 12AQ

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.

Traditional preamplifiers
For traditional preamplifiers such as Type 26AL (¼-inch) or Types 26AJ and 26AH (½-inch), the Type 12AQ provides:

CCP preamplifiers
For CCP (constant-current power) preamplifiers such as Types 26CB and 26CC (¼-inch) or Types 26CA and 26CF (½-inch), the Type 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 of10 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-weghted response.
• Ext for an optional, customised signal-response network (contact G.R.A.S. for further details).

Input
The microphone signal can enter the Type 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

Ouput
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 both 7-pin LEMO preamplifier inputs.

Power Supply
The Type 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 1..

Download PDF Data Sheet: pd_12AQ_ver_28_05_09.PDF

Related Products:

Type 12AA
Type 12AB
Type 12AD
Type 12AG
Type 12AK
Type 12AN
Type 12AP
Type 12AR

Adobe Acrobat reader is required for viewing data sheets.