GRAS 26CI 1/2'' CCP Preamplifier with BNC Connector, Low Frequency

Freq range: 1 Hz - 200 kHz
Noise: 1.8 µV Gain: -0.35 dB
Special feature: Low frequency

Technology

Typical applications and use

CCP inputs

Prepolarized microphones 

1/2" precision microphones

High levels and high frequencies

Design

The GRAS 1/2" Preamplifier GRAS 26CI is a small, robust unit and uses a GRAS CCP power supply, e.g. GRAS 12AL. It has a very low inherent noise level, a large dynamic range and a frequency response from 1 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 GRAS 26CI is provided with a built-in TEDS* chip, and can be programmed as a single unit with a microphone fitted. It is primarily intended for the low frequency microphone 46AZ but can be used with all GRAS 1/2" prepolarized microphones and with adapters with other microphone sizes.

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

* Transducer Electronic Data Sheet - as proposed by IEEE-P1451.4

Specifications

Frequency range (±0.2 dB) with 18 pF microphone dummy
Hz
1 to 200 k
Slew rate
V/µs
20
Input impedance
GΩ // pF
40 // 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
-0.35
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
Specification Conditions

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

Optional items

GRAS AA0035

3 m BNC - BNC Cable

GRAS AA0039-CL

Customized Length BNC - BNC Cable

GRAS AL0008

1/2" Microphone Holder, POM

GRAS AL0012

1/2" Microphone Holder, Stainless Steel

GRAS AL0005

Swivel head

GRAS AL0006

Tripod

GRAS RA0019

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

GRAS RA0073

Adapter for 1" microphone and 1/2" preamplifier

GRAS RA0190

Right-angled (90º) Adapter for 1/2" Microphone and 1/2" Preamplifier

GRAS RA0018

20 dB Attenuator for prepolarized 1/2" microphones

GRAS RA0062

20 pF Preamplifier-input Adapter for 1/2" preamplifiers

GRAS 12AL

1-Channel CCP Power Module with A-weighting filter

GRAS 12AQ

2-Channel Universal Power Module with signal conditioning and PC interface

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

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