GRAS 26AK-S1 1/2'' Preamplifier with Integrated Connector, Low Frequency

Freq range: 2.5 Hz to 200 kHz
Noise: 1.8 µV Gain: -0.25 dB
Special feature: Low frequency applications

Technology

Introduction

GRAS26AK-S1 is a preamplifier designed for general purpose in the laboratory and field and accommodates directly for all IEC 61094 standardized ½” externally polarized measurement microphones.

It is rugged and reliable and can handle microphone signals up to 50 Vpeak within 2 Hz to 200 kHz. The printed circuit board is made by use of thick-film substrate technology and optimized with respect to maximum suppression of microphonics and moisture rejection.

The high-quality, standard 7-pin LEMO male connector is integrated into the preamplifier and ensures that only one type of connector and cable is required for both connection and extension.

26AK-S1 is factory calibrated individually and delivered with a calibration chart stating its A-weighted and linear self-noise.

Compatibility

These preamplifiers are compatible with 1/2-inch microphones as defined in international standard IEC1094 Measurement Microphones, Part 4: Specifications for working standard microphones. The mounting thread (11.7 mm - 60 UNS-2) is compatible with other available makes of similar microphone preamplifiers.

GRAS 26AK-S1 is integrated with a 7-pin LEMO series 1B plug.

Specifications

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
40 // 0.4
Output impedance
Ω
75
Output Voltage Swing, max. @ ±14V/+28V power supply
Vp
12
Output Voltage Swing, max. @ ±60V/+120V power supply
Vp
50
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
-0.25
Power supply, single
V
28 to 120
Power supply, balanced
V
±14 to ±60
DC-offset, min., single suppy
V
0.5 x Vs - 1
DC-offset, max., single suppy
V
0.5 x Vs + 4
DC-offset, balanced supply
V
-1 to 4
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
Connector type
7-pin LEMO (FGG.1B.307)
CE/RoHS compliant/WEEE registered
Yes / Yes, Yes
Weight
g / oz
35.0 / 1.24
Specification Conditions

Conditions: 23 °C Ambient temperature, ±60V/+120V power supply, 18 pF dummy microphone, 3 m output cable. GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Dimensions

Ordering info

Optional items

GRAS AA0008

3 m LEMO 7-pin - LEMO 7-pin Cable

GRAS AA0020-CL

Customized Length LEMO 7-pin - LEMO 7-pin 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 RA0016

20 dB Attenuator for externally polarized 1/2" microphones

GRAS RA0062

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

GRAS 12AA

2-Channel Power Module with gain, filters and SysCheck generator

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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