G.R.A.S. 67SB Blast Probe Microphone according to ANSI S12.42

Freq range: 10 Hz to 20 kHz
Dyn range: 44 dB(A) to 174 dB
  • 67SB Blast Probe Mic
  • 67SB Blast Probe Mic
  • 67SB Blast Probe Mic

The 67SB Blast Probe is designed as a reference microphone for impulse measurements according to the ANSI S12.42 standard. The 67SB can measure impulse signals with an A-duration of 0.5 ms ≤ impulse ≤ 2.0 ms, and it has a working range of 10 Hz – 20 kHz. The ⅛” reference microphone inside the 67SB is ideally suited for capturing impulsive signals with a very fine time resolution. This microphone has an upper limit of 174 dB in the dynamic range.

The 67SB is equipped with a 1/8" reference microphone which is designed to capture impulsive noise with a very short duration. The 67SB is provided with a 1/4" threaded hole for monting the 67SB directly on a tripod e.g. AL0006.

The design and concept of the 67SB, and the microphone and preamplifier, comply with the following standards:
• ANSI S12.42 – “Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real Ear or Acoustic Test Fixture Procedures”
• IEC Standard 61094-1 – “Specifications for Laboratory Standard Microphones”

The 67SB has a length of 410 mm.

Frequency range (±2 dB) Hz 10 to 20 k
Dynamic range lower limit (microphone thermal noise) dB(A) 44
Dynamic range upper limit dB 174
Microphone venting Rear
Output impedance Ω 75
Temperature range, operation °C / °F -30 to 70 / -22 to 158
Temperature range, storage °C / °F -40 to 85 / -40 to 185
Static pressure coefficient @250 Hz dB/kPa -0.01 at 25 °C
Humidity range non condensing % RH 0 to 95
Humidity coefficient @250 Hz dB/% RH <0.1/0-100
Influence of axial vibration @1 m/s² dB re 20 µPa 59
Connector type 3 m 7-pin LEMO
CE/RoHS compliant/WEEE registered Yes/Yes/Yes
Weight g / oz 650 /22.9


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