Type 40HL


Type 40HL
The G.R.A.S. ½″ Low-noise Microphone System Type 40HL measures sound pressure levels well below the threshold of human hearing. It is thus generally suitable for sound-power measurements on even very quiet products. Its very wide dynamic range permits measurements down to below 6.5 dBA re. 20 μPa (in 1/3-octave bands) from 20 Hz to 20 kHz.
Type 40 HL comprises:
  • a special high-sensitive ½″ free-field measurement microphone
  • a dedicated ½″ low-noise preamplifier
Applications:
  • Measurements at very low sound pressure levels
  • Measurements on hard-disk drives, computer products, anechoic rooms, quiet rooms, etc.
  • Sound power measurements at low levels
Special Features:
  • Connects to most high-quality LEMO-connected input modules
  • Microphone and preamplifer assembled and sealed under clean-room conditions
  • Preamplifier with built-in TEDS, i.e., preprogrammed and programmable with calibration data as a complete unit together with the microphone
  • Small and rugged design featuring true ½″ dimensions
  • Low power consumption (max. 5.5 mA).
Specifications Type 40HL
Specifications Type 40HL
Nominal sensitivity, system:
System 900 mV/Pa

 
Frequency range:
12.5 Hz – 10 kHz ± 1 dB
 
10 Hz – 16 kHz ± 2 dB

6 Hz – 20 kHz + 2 dB, –3 dB
Dynamic range:
6.5 dBA to 113 dB re. 20 µPa
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