G.R.A.S. 26AK 1/2'' Standard Preamplifier with Integrated Connector

Freq range: 2.5 Hz to 200 kHz
Noise: 1.8 µV
Gain: -0.25 dB
Special feature: General purpose

Introduction

G.R.A.S. 26AK is a preamplifier designed for general purpose in the laboratory and field and accommodates directly 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 is factory calibrated individually and delivered with a calibration chart stating its A-weighted and linear self-noise.

Compatibility

26AK is compatible with ½-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 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 20 // 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
High-pass filter @3dB cut-off Hz TBD
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.

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