GRAS EQ 40PM-1 EQset™ Miniature Production Line Microphone, High Precision

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GRAS EQ 40PM-1 EQset™ Miniature Production Line Microphone, High Precision

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EQ 40PM-1 with EQset is an upgraded version of the EQ 40PM. It is designed for use in production line environments, and it provides many benefits over traditional production line- or array-style microphones.

Designed to be cost-effective, easy to use, resistant to errors, and environmentally stable, EQ 40PM is the best production line microphone option on the market. Each EQ 40PM-1 microphone has a flat response curve and fixed sensitivity. The tolerance for individual microphone sensitivities is less than ±0.2 dB, and frequency-response variation is less than ±0.5 dB up to 20 kHz. And because EQ 40PM-1 is dimensionally identical to the traditional production line microphones, it can easily replace them in existing setups.

Freq range: 20 Hz to 20 kHz
Dyn range: 30 dB(A) to 125 dB
Sensitivity: 20 mV/Pa

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Product Overview

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Cost efficiency—low measurement microphone entry cost, no special hardware needed, and fully backwards compatible with CCP setups.

Ease of use—EQ 40PM-1 is dimensionally identical to the traditional production line microphones, it can easily replace them in existing setups. 

Reduced risk—the extremely narrow pressure response spread (±0.5 dB) greatly reduces the risk of false passes and false failures, which greatly reduces the risk of bad units reaching the customer and the risk of good units being scrapped or recycled.

High environmental stability—the unique design of the EQ 40PM provides this range of microphones with unmatched environmental stability. Deviation on a typical production line is less than ±0.2 dB, so there is no need for corrections due to temperature or humidity.

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Freq range: 20 Hz to 20 kHz
Dyn range: 30 dB(A) to 125 dB
Sensitivity: 20 mV/Pa

Product Features

GRAS EQ 40PM-1 with EQset™

EQ 40PM-1 with EQset is an upgraded version of the EQ 40PM. It is designed for use in production line environments, and it provides many benefits over traditional production line- or array-style microphones. Designed to be cost-effective, easy to use, resistant to errors, and environmentally stable, EQ 40PM is the best production line microphone option on the market. Each EQ 40PM-1 microphone has a flat response curve and fixed sensitivity. The tolerance for individual microphone sensitivities is less than ±0.2 dB, and frequency-response variation is less than ±0.5 dB up to 20 kHz. And because EQ 40PM-1 is dimensionally identical to the traditional production line microphones, it can easily replace them in existing setups.

 

EQset technology

EQset microphones all have a uniformly fixed sensitivity and flat curve. This reduces measurement uncertainty and greatly simplifies microphone setup, monitoring, replacement, and corrections. EQset means that everything can happen quickly and easily without any individual microphone adjustments or corrections. The simplification of setup and other tasks saves both time in the setup itself and time in operator training. There is, however, one additional benefit that outshines the time savings: EQset almost completely eliminates the inherent risk of false passes on production lines or correction frequencies outside the calibrated frequency in R&D—common issues with other microphones in the market.

Another benefit of the uniformly fixed sensitivity and flat response curve of each EQset microphone is that there is no need to make individual corrections for each microphone. There is, therefore, no need to store that correction information on the microphones via TEDS. This enables EQset microphones to be used effectively with systems based on audio sound cards using 48 V phantom power as well as any CCP-based system already in use, so there is no need for price-prohibitive new equipment or retooling of existing CCP-based systems.

 

For more info on EQset Technology, view here --> NEW EQset™ Technology (tmesystems.net)

 

Environmental stability

The unique design of the EQ 40PM-1 provides this range of microphones with unmatched environmental stability. The deviation on a typical production line is less than ±0.2 dB, so there is no need for corrections due to temperature or humidity over the course of a normal day in a typical production-line environment. Typical environmental conditions on a production line are defined by temperature varying between 13 and 35°C (55 to 95°F), static pressure varying between 983 and 1043 hPa, and non-condensing humidity.

 

Typical applications and use

Production-line testing of audio devices such as drivers, receivers, micro-speakers, and miniature microphones

Measurements in confined spaces

When starting up, these microphones have a settling time of approximately 5 seconds for accuracy better than 0.1 dB or 1 minute for full accuracy.

 

Design

The GRAS EQ 40PM-1 is a robust, cost-effective microphone designed for use in production line testing of loudspeakers and acoustic transducers. It has a wide frequency range, from 20 Hz to 20 kHz, and a dynamic range from 30 dB (A) to 125 dB.

The cost-effectiveness of the EQ 40PM-1 is a key consideration when setting up multiple production lines. Each EQ 40PM-1 is interchangeable with any other EQ 40PM-1 without the need for recalibration or additional corrections.

EQ 40PM-1 is a 34 mm long ¼″ microphone that can be used in space-challenged setups where larger microphones would not fit or provide difficulties in testing. Additionally, its small aperture provides an advantage in testing micro-speakers, or miniature microphones. It is good practice to use a microphone with a diameter similar to or smaller than the device to be measured.

 

Compatibility

This range of microphones is fully compatible with 48 V phantom power setups and CCP-based setups. As such the EQ 40PM-1 can be used in new cost-saving production-line setups or as replacements for less accurate TEDS-based microphones in existing CCP setups.

 

Calibration—measurement chain

GRAS EQ 40PM microphones can be calibrated to ensure that down-stream equipment (such as a sound card) is correctly set up using a pistonphone like GRAS 42AP or a hand-held calibrator like the GRAS 42AG Multifunction Sound Calibrator. The tolerance of the 42AG is comparable to 40PM-1 microphone, The most precise calibration with 40AG will be opbtained @250Hz

 

Quality and warranty

GRAS microphone sets are made of components from our proven standard portfolio and are all manufactured of high-quality material and branded parts that were chosen and processed to ensure life-long stability and robustness.

All parts are manufactured and assembled at the factory in Denmark by skilled and dedicated operators.

Thanks to the high quality, our warranty against defective materials and workmanship is two years.

 

Datasheets

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