Bruel & Kjaer 4939 Microphone, Free Field (Replaces 4135) – 1/4inch
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Description
The Bruel & Kjaer 4939 Microphone, Free Field (Replaces 4135) is a top-notch microphone specially designed for measuring sound in open spaces. It has a 1/4 inch connector and boasts exceptional sensitivity and accuracy in capturing sound signals. This microphone is an upgraded version of the previous model 4135, featuring enhanced features and improvements. With its advanced technology and precise construction, the Bruel & Kjaer 4939 microphone is perfect for a wide range of applications, including sound measurements, acoustic analysis, and monitoring environmental noise. Its consistent performance and compatibility make it an invaluable tool for professionals working in audio engineering and research.
Specifications
– Model: Bruel & Kjaer 4939
– Microphone type: Free Field
– Replaces model 4135
– Connector type: 1/4 inch
– Frequency range: (20 Hz – 20 kHz)
– Sensitivity: -46 dB re. 1 V/Pa
– Polarization voltage: 200V
– Directional pattern: Omni-directional
– Dimensions: 12.7 mm diameter, 17.8 mm length
– Weight: 3.2 grams
– Operating temperature range: -10°C to +55°C
– Maximum sound pressure level (SPL): 140 dB
– Output impedance: 200 ohms
– Equivalent noise level: 31 dB(A)
– Power supply: Phantom power (24 – 48 V DC)
Laboratory Calibration
Micro Precision operates 36 laboratories globally providing reliable localized support
- Certified metrologists staffing laboratories in North America, Central America, South America, Europe, Asia, and the Middle East
- Comprehensive scopes of accreditation to meet a broad range of customer needs
- Expedited calibration services available
- Pickup and delivery services available
- Environmentally controlled facilities to ensure high quality and accurate calibrations and measurements.
Laboratory Calibration
Micro Precision operates 36 laboratories globally providing reliable localized support
- Certified metrologists staffing laboratories in North America, Central America, South America, Europe, Asia, and the Middle East
- Comprehensive scopes of accreditation to meet a broad range of customer needs
- Expedited calibration services available
- Pickup and delivery services available
- Environmentally controlled facilities to ensure high quality and accurate calibrations and measurements.
Quality Certified Test Equipment Repair Services
When a piece of equipment fails you have the option to repair or replace that item. Oftentimes repair is an economical and efficient solution. Micro Precision’s repair offering provides advantages to our customers:
- Cost effective; often less than OEM
- Efficient; often much better turn-time than the OEM
- Flexibility; willingness to work with customers to meet their needs
- Warranted repairs
- Ability to service many obsolete instruments
Quality Certified Test Equipment Repair Services
When a piece of equipment fails you have the option to repair or replace that item. Oftentimes repair is an economical and efficient solution. Micro Precision’s repair offering provides advantages to our customers:
- Cost effective; often less than OEM
- Efficient; often much better turn-time than the OEM
- Flexibility; willingness to work with customers to meet their needs
- Warranted repairs
- Ability to service many obsolete instruments
Cost Effective Test Equipment Options
From the leasing of specialized electronic equipment for a specific task, to the purchase of physical and dimensional tools, we offer leasing services as well as used test equipment sales. We also locate hard-to-find electronics, and provide flexible options to meet ever-changing equipment needs.
Cost Effective Test Equipment Options
From the leasing of specialized electronic equipment for a specific task, to the purchase of physical and dimensional tools, we offer leasing services as well as used test equipment sales. We also locate hard-to-find electronics, and provide flexible options to meet ever-changing equipment needs.
Our Capabilities
Micro Precision can perform instrument calibration services on equipment from variety of applications for specific industries and lines of business. If you have a calibration need that is not listed in this area, please contact us.
Electrical
Micro Precision accredited electrical calibration lab services with multimeter, multifunction calibrator, oscilloscope, and power supply capabilities.
Optical
Micro Precision accredited optical, light, and fiber optic calibration lab services.
Thermodynamics & Chemical
Micro Precision accredited thermodynamic & chemical calibration lab services with temperature, humidity, life science, and pharma capabilities.
RF - Microwave
Micro Precision accredited RF & microwave calibration lab services.
Mechanical & Dimensional
Micro Precision accredited mechanical and dimensional calibration lab services with pressure, torque, force, flow, velocity, and aircraft jack load capabilities.
Laboratory Standards
Calibration laboratory standards are critical for your organization’s most accurate measurements.
Semiconductor Calibration
Micro Precision utilizes state-of-the-art technology to analyze semiconductor wafer thickness and step height.