CCP Pressure High Temperature Microphone Set GRAS 1/4″ 46BL-HT (4-20kHz)

Introduction

• The 46BL-HT is a ¼” CCP pressure microphone set, optimized for high sensitivity, low noise and high temperatures.
• It complies with IEC 61094: Measurement Microphones, Part 4: Specifications for working standard microphones, except that the upper limit of the useful frequency range is 20 kHz.
• The set is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit sensitivity and pressure frequency response.

Design

• The set consists of a modified 40BL ¼” CCP Pressure Microphone, High Sensitivity and a modified 26CB ¼” preamplifier with Microdot connector.
• The diaphragm is slightly larger than usual for a ¼” microphone, and the protective grid has been modified accordingly.
• The rear-venting is through a hole close to the rear of the preamplifier, and the set has been optimized for high-temperatures up to 120 °C/248 °F.

Typical Applications and Use

• The 46BL-HT can be used for applications where a ½” microphone would be the natural choice, but the advantages of a smaller microphone are desired. Its small dimensions mean that its presence in the sound field has minimal influence in the audible frequency range. It can be used to measure frequencies up to 20 kHz. Its high sensitivity and low noise make it ideally suited for all applications with low to moderate sound levels.
• 46BL-HT is ideally suited for production line testing of portable communication devices, such as cell phones, laptop computers, tablets, GPS receivers, and similar devices using micro speakers. It is also well suited for general acoustic measurements when high sensitivity and low noise are required.
• 46BL-HT is heat resistant up to 120 °C/248 °F and can be used for measurements in hot environments, e.g. an engine compartment or similar. The TEDS chip can operate up to 85° Celsius.

Compability

• The 46BL-HT uses a Microdot connector, which requires an input module that supports this technology. Our 1/4” rain protection cap and nose cone do not fit.

Calibration

• 46BL has a diaphragm that is slightly larger in diameter than is standard for 1/4″ microphones. This does not affect sensitivity calibration, but for frequency calibration, you need a RA0236 Adapter.

System Verification

• For daily verification and check of your measurement setup, we recommend using a calibrator like GRAS 42AG Sound Calibrator. For proper sensitivity calibration, we recommend using a pistonphone like GRAS 42AP Intelligent Pistonphone.

Calibration

• Before leaving the factory, all GRAS products are calibrated in a controlled laboratory environment using traceable calibration equipment. An individual test certificate stating the sensitivity and frequency response is included with each product.