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Casella 1/2" General Purpose Electret Microphone Free Field Incidence

Item #:
CEL-252
Brand:
Casella
Casella 1/2" General Purpose Electret Microphone Free Field Incidence
$150.00
Qty

Discontinued

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Casella 1/2" General Purpose Electret Microphone Free Field Incidence

Casella 1/2" General Purpose Electret Microphone Free Field Incidence

$150.00

Discontinued


CEL-252 1/2" General Purpose Electret Microphone Free Field Incidence by Casella

The CEL-252 microphone is the best choice for use in ANSI and IEC61672 Class 2 Sound Level Meters and other noise measurements requiring Class 2 (or general purpose) accuracy. It is a 1/2" prepolarized free-field measurement microphone designed for high quality and reasonable cost for noise meters that can accept standard screw on microphones.

Key Benefits

  • Pre polarized design does not require 200Vdc supply bias voltage
  • Frequency range 20 Hz to 12.5 kHz ± 2 dB
  • Free-field response
  • Rugged design for long trouble free operating life
  • Standard WS2 thread size for interchangeability with many popular measurement instruments
  • Measurements up to 140 dB
  • Low noise floor for quiet background measurements

Applications

The CEL-251 is manufactured to exacting standards along with rigorous mechanical and acoustic testing to ensure its high quality, reliability, and extreme stability in all kinds of environments. Its performance stems from its polymer diaphragm using the latest diaphragm coating technology. The CEL-251 microphone housing is made from the same copper to ensure small temperature coefficients within the tolerances allowed by the standards.

Production quality control for the CEL-252 uses sophisticated techniques to ensure that the frequency response tolerances allowed by ANSI/IEC61672 Class 2 devices are still met. The figure shows the typical free-field frequency response curve of the CEL-252 family of microphones. This ensures that the sound level meter or measurement system that is connected to the microphone will remain inside the allowed tolerances for general-purpose Class 2 noise meters.

The stability and versatility of every CEL-252 microphone capsule has been proven in many fields of acoustic measurements. The capsule uses the international standard thread 60 UNS which ensures compatibility with a wide range of microphone preamplifiers and noise instruments such as the CEL-400 series of noise analyzers. The CEL-252 is fitted to the CEL-430.A2 model as the standard microphone when it is ordered as part of a standard kit.

Transducer type Capacitive pressure transducer
Frequency range (free-field response) 20 Hz ... 12.5 kHz (± 2 dB)
Sensitivity at 1 kHz (nominal) 32 mV/Pa*
Max. SPL for THD ≤ 3 % at 1 kHz 135 dB
Inherent ‘A’ weighted noise level with CEL-400 or 500 sound level meter <23 dB
Polarization voltage used Back-electret (200 V dc not required)
Pressure equalization venting Rear vented
Polarized cartridge capacitance (at 1 kHz) ~20 - 30 pF*
Operating temperature range 32ºF - 104ºF (-0 ... +40 °C)
Main ambient temperature coefficient ≤0.05 dB/ºC
Main ambient pressure coefficient -0.05 dB/kPa
Main ambient humidity coefficient -0.02 dB/%RH
Diameter (with protection grid) 0.5 in (13,2 ± 0,02 mm)
Height 0.67 in (17 mm)
Weight 0.3 oz (9 g)
Preamplifier thread 11,7 mm 60 UNS

Datasheets & User Manuals

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