G.R.A.S. 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

Introduction

G.R.A.S.26AK-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.

G.R.A.S. 26AK-S1 is integrated with a 7-pin LEMO series 1B plug.

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

Optional items

G.R.A.S. AA0008

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

G.R.A.S. AA0020-CL

Customized Length LEMO 7-pin - LEMO 7-pin Cable

G.R.A.S. AL0008

1/2" Microphone Holder, POM

G.R.A.S. AL0012

1/2" Microphone Holder, Stainless Steel

G.R.A.S. AL0005

Swivel head

G.R.A.S. AL0006

Tripod

G.R.A.S. RA0019

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

G.R.A.S. RA0073

Adapter for 1" microphone and 1/2" preamplifier

G.R.A.S. RA0190

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

G.R.A.S. RA0016

20 dB Attenuator for externally polarized 1/2" microphones

G.R.A.S. RA0062

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

G.R.A.S. 12AA

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

G.R.A.S. 12AQ

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

 G.R.A.S. Sound & Vibration reserves the right to change specifications and accessories without notice.