Measurement microphone cartridge MK 211 E

prepolarizedcapacitorfree-field

Overview
The microphone capsule MK 211 E has a free-field response with a frequency range up to 40 kHz and is therefore optimized for correct acoustic measurements under free-field conditions with 0 degree incidence.
The equalization of the static air pressure is by means of a capillary to the preamplifier (rear-vented).

The microphone capsule is suitable for sound level meters of Type 1 acc. IEC 61672.

“E” means, the capsules are prepolarized and can be used on all preamplifiers with 0V polarization voltage or on a preamplifier, where the user can switch of the polarization voltage on the measurement system (switch on frontend or in a software).

Main features

• WS2F per IEC 61094-4
• Free-field response
• Frequency range: 10 Hz to 40 kHz
• Noise floor 22 dB(A) to max SPL 161 dB
• Prepolarized (0 V)

Contents

• Wooden case
• Surface finish: nickel
• Order number: 311161

Technical specifications

• Transducer type: capacitive pressure receiver
• Free-field frequency response: ±2 dB = 10 Hz to 35 kHz; ±3 dB = up to 40 kHz
• Open-circuit sensitivity: 12.5 mV/Pa
• Open-circuit level re 1 V/Pa: -38 dB ± 1.5 dB
• Maximum sound pressure level for 3% THD at 1 kHz: Peak (with MV 204 @ 120 V) = 161 dB; RMS (with MV 204 @ 120 V) = 158 dB
• Inherent noise (with MV 204): 22 dB(A)
• Polarization voltage: 0 V
• Capacitance at 1 kHz: 18 pF
• Operating temperature range: -50 °C to +100 °C
• Temperature coefficient: ≤ 0.01 dB/K
• Static pressure coefficient: -1 × 10⁻⁵ dB/Pa
• Diameter without windshield: 12.7 mm ± 0.05 mm; with windshield: 13.2 mm ± 0.05 mm
• Length: 12.8 mm
• Weight: 7 g
• Thread for preamplifier: 11.7 mm 60 UNS
• Thread for windshield: 12.7 mm 60 UNS
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