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Sound and Vibration Instrument Hire and Calibration

GRAS 12AA Specifications


GRAS 12AA Microphone Power Supply
 
GRAS 12AA : Microphone Power Supply - dual channel £ 5 a day *
 

Channels :


2 x Lemo 1B 7-pin microphone inputs
2 x BNC output sockets
 

Gain :

- 20 dB :  0 :  + 20 dB :  + 40 dB and straight through
 

Supplies :


Preamplifier Supply : 28 V or 120 V
Polarisation Voltage : 200 V or 0 V
 

Gain Error :

< 0.2 dB
 

Frequency Response :


3.5 Hz to 200 kHz   ± 1.0 dB
2 Hz to 250 kHz   ± 3.0 dB
 

Channel Separation :

> 60 dB, 20 Hz to 20 kHz
 

Noise Floor :


20 Hz to 20 kHz : < 0 dBA and < 4 dB Flat, with short circuit input
20 Hz to 20 kHz : < 10 dBA and < 15 dB Flat, with preamplifier. + dummy microphone
 

A-Weighting Filter :

BS EN 60651 Type 0
 

Output Impedance :

30 ohms
 

Power Supply :


Batteries : 10 x Lr6, AA type
Battery Life : 8 hours with alkaline cells
Line Adaptor : 12-18 Vdc regulated supply
Current : 190 mA with one GRAS preamplifier
Fuse : 250 mA, slow, 250 V
 

Operating Temperature :

- 10 °C to + 50 °C
 

Size and Weight :


Height : 132.6 mm
Width : 34.6 mm
Depth : 196.0 mm
Weight : 770 g : 1.69 lb without batteries
 
E&OE - specifications subject to change without notice.