Type 26AS


Type 26AS
The G.R.A.S. ¼" Preamplifier Type 26AS is for acoustic measurements using condenser microphones.
It is a small robust unit short enough for use in confined spaces, e.g. for binaural measurements with the KEMAR Manikin Type 45BA or the Hearing-protector Test Fixture Type 45CA.
It has a very low inherent-noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.
Like all G.R.A.S. microphone preamplifiers, it is based on a small ceramic thick-film substrate with a very high input impedance. The casing is made of stainless steel for maximum strength and durability. Its small dimensions ensure reliable operation under humid conditions owing to the heat generated by internal power dissipation.
The Type 26AS is provided with a 3 m lightweight cable terminating in a 7-pin LEMO series 1B plug. The cable is only 2.5 mm in diameter and will withstand temperatures from –40 ºC to +150 ºC. An adaptor GR0010 for G.R.A.S. ½" microphones is included.
Specifications Type 26AS
Specifications Type 26AS
Frequency range: 2 Hz - 200 kHz (±0.2 dB)
Input impedance: 0.4 pF, 20 G Ohm
Output impedance: 55 Ohm (typical)
Output connector: 7-pin LEMO male
Power supply, Single: 28 V, 0.7 mA to 120 V, 2.5 mA
and Dual: ±14 V, 0.7 mA to ±60 V, 2.5 mA
Noise, A-weighted and: ≤ 4 µV
Linear (20 Hz - 20 kHz): ≤ 10 µV rms 
Gain: –0.25 dB (typical)
Operating temperature: –30 °C to + 70 °C
Storage temperature: –40 °C to + 85 °C
Dimensions (ex cable): diameter: 6.35 mm (¼")
length: 28.65 mm
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