Manufacturers' Specifications

GRAS 26 series - typical values

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%