G.R.A.S. 26CA 1/2'' CCP Standard Preamplifier with BNC Connector

Freq range: 2.5 Hz - 200 kHz
Noise: 1.8 µV
Gain: -0.30 dB
Special feature: General purpose

Typical applications and use

CCP inputs (ICP ®)

Prepolarized microphones ½-inch precision microphones

High levels and high frequencies


The G.R.A.S. 1/2"-inch Preamplifier G.R.A.S. 26CA is a small, robust unit and uses a G.R.A.S. CCP power supply (ICP ®), e.g. G.R.A.S. 12AL. It has a very low inherentnoise level, a large dynamic range and a frequency response from below 2 Hz to above 200 kHz.

Its small ceramic thick-film substrate has a very high input impedance, and is shielded by a guard ring to minimise the influence of stray capacitance and microphonic interference.

The G.R.A.S. 26CA is delivered with a built-in TEDS *chip, and can be programmed as a single unit with a microphone fitted. It can be used with all G.R.A.S. prepolarized microphones, namely: 1/2-inch microphones: G.R.A.S. 40AE, 40AD and 40AQ 1/4-inch microphones: G.R.A.S. 40BE and 40BD, using the optional 1/2"-inch to 1/4-inch adaptor RA0019.

It has an integrated BNC output connector. The casing is made of stainless steel for maximum strength and durability.

® ICP is a registered trademark of PCB Piezotronics Inc.

* Transducer Electronic Data Sheet - as proposed byIEEE-P1451.4

Frequency range (±0.2 dB) with 18 pF microphone dummy Hz 2.5 to 200 k
Slew rate V/µs 20
Input impedance GΩ // pF 20 // 0.4
Output impedance Ω < 50
Output Voltage Swing, min. @ 24-28 V CCP voltage supply Vp 8
Noise (A-Weighted) max. µV 2.5
Noise (A-Weighted) typ. µV 1.8
Noise (Linear 20 Hz – 20 kHz) max. µV 6
Noise (Linear 20 Hz – 20 kHz) typ. µV 3.5
Gain dB -0.30
Power supply (Constant Current Power) mA 2 to 20 (typical 4)
DC bias voltage, typ. V 12
Temperature range, operation °C / °F -30 to 70 / -22 to 158
Temperature range, storage °C / °F -40 to 85 / -40 to 185
Humidity range non condensing % RH 0 - 95
TEDS UTID (IEEE 1451.4) 769 v. 0.9
Connector type BNC
CE/RoHS compliant/WEEE registered Yes / Yes, Yes
Weight g / oz 26.0 / 0.92
Conditions: 23 °C Ambient temperature, 4 mA / 24 V open loop CCP voltage, 18 pF dummy microphone, 3 m output coax-cable.