G.R.A.S. 26CK 1/2” CCP Standard Preamplifier with Microdot Connector, Very Short

Freq range: 2.5 Hz - 200 kHz
Noise: 1.8 µV
Gain: -0.45 dB
Special feature: For confined spaces

Typical applications and use

  • For use in confined spaces
  • High-frequency measurements
  • High-pressure measurements
  • Sound intensity measurements
  • Near-field measurements
  • Anechoic boxes
  • Hearing-aid measurements

Design

The small, ceramic thick-film substrate in the 26CK has a very high input impedance and is shielded by a guard ring, which minimizes the influence of stray capacitance and microphonic interference.

The 26CK has a built-in TEDS chip; when fitted with a microphone, it can be programmed as a single unit. It can be used with the following G.R.A.S. prepolarized microphones:

  • 40AE ½” Prepolarized Free-Field Microphone
  • 40AD ½” Prepolarized Pressure Microphone
  • 40AO ½” Prepolarized Pressure Microphone,High Frequency
  • 40AQ ½” Prepolarized Random Incidence Microphone

The 26CK has an integrated Microdot output connector.

The casing is made of stainless steel for maximum strength and durability.

Calibration

Before leaving the factory, G.R.A.S. products are tested and calibrated by G.R.A.S., and an individual test certificate is included with the product.

G.R.A.S. Sound & Vibration continually strives to improve the quality of our products for our customers; therefore, the specifications and accessories are subject to change.

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 -0.45
Power supply (Constant Current Power) mA 2 to 20 (typ. 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 to 95
TEDS UTID (IEEE 1451.4 ) 769 v. 0.9
Connector type Microdot 10/32
CE/RoHS compliant/WEEE registered Yes / Yes, Yes
Weight g / oz TBD
Conditions: 23 °C Ambient temperature, 4 mA / 24 V open loop CCP voltage, 18 pF dummy microphone, 3 m output coax-cable.
G.R.A.S. AA0070 3-m Microdot-to-BNC cable
G.R.A.S. AA0071 5-m Microdot-to-BNC cable
G.R.A.S. AA0072 10-m Microdot-to-BNC cable
G.R.A.S. AA0073-XX Custom-length Microdot-to-BNCcable
G.R.A.S. AE1038 Adapter, Microdot female-female