GRAS 26CT 1/4" CCP Standard Preamplifier with SMB Connector, Very Short

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

The GRAS 26CT 1/4" Preamplifier is a very small preamplifier optimized for use with prepolarized condenser microphones. It is a robust unit and uses a CCP power supply. It has a very low inherent noise level, a large dynamic range and a frequency response from below 2 Hz to above 200 kHz.

Technology

Typical applications and use

Confined spaces
High-frequency measurements
High-pressure measurements
Sound intensity measurements
Near-field measurements
Anechoic boxes
Hearing-aid measurements

Design

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 26CT is delivered with Generation II TEDS. The calibration data is programmed into the built-in TEDS according to IEEE 1451.4 using UDID I27-0-0-0U. If your measurement platform supports Transducer Electronic Data Sheets you will be able to read and write data like properties and calibration data.

Generation II TEDS chip (DS2431) may require updated system software.

It can be used with GRAS 40BE and 40BD 1/4" and 40AE, 40AD and 40AQ 1/2" prepolarized microphones using the included GRAS GR0010 Adapter for 1/4" preamplifier and 1/2" microphone.

The 26CT has an integrated SMB connector. SMB-to-BNC cables are available, also with angled SMB. The casing is made of stainless steel for maximum strength and durability.

Specifications

Frequency range (±0.2 dB) with 18 pF microphone dummy

2.5 to 200 k

Slew rate

V/µs

Input impedance

GΩ // pF

20 // 0.4

Output impedance

< 50

Output Voltage Swing, min. @ 24-28 V CCP voltage supply

Noise (A-Weighted) max.

µV

2.5

Noise (A-Weighted) typ.

µV

1.8

Noise (Linear 20 Hz – 20 kHz) max.

µV

Noise (Linear 20 Hz – 20 kHz) typ.

µV

3.5

Gain

-0.45

Power supply (Constant Current Power)

2 to 20 (typ. 4)

DC bias voltage, typ.

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 UDID (IEEE 1451.4)

I27-0-0-0U

Connector type

SMB

CE/RoHS compliant/WEEE registered

Yes / Yes, Yes

Weight

g / oz

4.0 / 0.14

Conditions: 23 °C Ambient temperature
4 mA / 24 V open loop CCP voltage
18 pF dummy microphone
3 m output coax-cable

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Dimensions

Ordering info

Included items

GR0010

Adapter for 1/4" preamplifier and 1/2" microphone

Optional items

GRAS AA0027	3 m SMB - BNC Cable
GRAS AL0029	1/4" Microphone Holder, POM
GRAS AL0013	1/4" Microphone Holder, Stainless Steel
GRAS AL0005	Swivel head
GRAS AL0006	Tripod
GRAS RA0063	Adapter for 1/8" microphone and 1/4" preamplifier
GRAS RA0006	Right-angled (90º) Adapter for 1/4" Microphone and 1/4" Preamplifier
GRAS RA0080	6pF Preamplifier-input adapter for 1/4" microphones
GRAS 12AL	1-Channel CCP Power Module with A-weighting filter
GRAS 12AQ	2-Channel Universal Power Module with signal conditioning and PC interface