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Sound and Vibration Instrument Hire and Calibration

GRAS 26xx Specifications - typical values


GRAS Microphone Preamplifier
 
GRAS 26xx : Microphone Preamplifiers £ 3 a day *
 

Frequency Response (18 pF/small signal) :


2 Hz to 200 kHz   ± 0.5 dB
 

Input Impedance:

20 GΩ 0.4 pF
 

Output Impedance (Cs=20 pF, f=1000 Hz) :

55 Ω typical
 

Noise measured with 20 pF, 1/2" dummy microphone :


A-weighted :   < 2.2 µV rms, typically 1.8 µV rms
Linear: 20 Hz - 20 kHz   :   < 6 µV rms
Linear: 20 Hz - 200 kHz :   < 8 µV rms
 

Gain (typical) :

  -0.15 dB
 

Power Supply :


120 V or ± 60 V, 2.5 mA down to
  28 V or ± 14 V, 0.7 mA
 

Output Voltage (peak) :


from ±50 V to ±10 V
 

Temperature :


Operation :   - 20 °C to + 60 °C
Storage :       - 25 °C to + 70 °C
 

Relative Humidity :


Operation :   0 to 90%
Storage :      0 to 95%
 
E&OE - specifications subject to change without notice.