GRAS 26CF 1/2'' CCP Preamplifier with BNC Connector, Gain and Filters

Freq range: 2.5 Hz - 200 kHz
Noise: 1.8 µV Gain: -0.25 / +20 dB
Special feature: 0/20 dB gain, A-weighting and HP filters

Technology

Gain and filter switch settings

There are two flush-mounted switches for selecting various combinations of gain and filtering, i.e.:

Gain switch settings:

  • 0 dB - for normal microphone signals.
  • +20 dB - for boosting weak microphone signals.

Filter switch settings:

  • A-Weighting - as required in standard measurements.Linear - to let the microphone signal passunfiltered.
  • High-pass - to cut off unwanted low frequencies.

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 26CF can be used with all GRAS prepolarized microphones, namely:

  • 1/2-inch microphones: GRAS 40AE, 40AD and 40AQ
  • 1/4-inch microphones: GRAS 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 maximumstrength and durability.

CCP stands for “Constant Current Power” and describesGRAS power supplies that maintain a constant level ofcurrent for driving IEPE transducers like this preamplifier which can be used with prepolarized microphone cartridges such as GRAS 40AD, 40AE, 40AO and 40AQ.

Specifications

Frequency range (±0.2 dB) with 18 pF microphone dummy
Hz
2.5 to 200 k
Slew rate
V/µs
TBD
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
High-pass filter @3dB cut-off
Hz
20
Gain
dB
-0.35
Power supply (Constant Current Power)
mA
4 to 20 (typ. 4)
DC bias voltage, typ.
V
14
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
Connector type
BNC
CE/RoHS compliant/WEEE registered
Yes / Yes, Yes
Weight
g / oz
30.0 / 1.06
Specification Conditions

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

Frequency response of A-weighting filter (compliant with IEC 61672-1 Class 1)

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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