Field Testing - GeoSpectrum Technologies Inc https://geospectrum.ca/product-tag/field-testing/ Specialists in underwater acoustic transducers and systems Tue, 15 Sep 2026 18:13:03 +0000 en-US hourly 1 https://wordpress.org/?v=7.1.4 M351 Field Calibrator https://geospectrum.ca/product/m351-field-calibrator/ Thu, 15 Jun 2023 13:45:20 +0000 https://geospectrum.ca/?post_type=product&p=7501 Validate hydrophone sensitivity before deployment

The M351 allows users to easily test their hydrophones before deploying for use. Ocean trials and testing can be costly; having equipment deployed that is dysfunctional and or not accurate can cause inaccurate data collection. This malfunction can cost customers in time and funds. The M351 allows users to test their hydrophones reducing the risk of hydrophone dysfunction and validate hydrophone sensitivity before deploying their monitoring systems.

The M351 is a battery-operated precision hydrophone field calibrator. The calibrator can display the hydrophone (HP) sensitivity and/or the sound pressure level (SPL) in the calibration chamber. The M351 is intended to calibrate GTI hydrophones, or can be supplied with a custom interface to support hydrophones from other suppliers.

GTI provides a windows application, Hydrophone (HP) Connection Software, which enables users to update firmware on the field calibrator as well as to view the data stored on the internal EEPROM. Communication with the field calibrator is achieved serially via a USB-B port on the calibrator.

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  • Hydrophone: M36 & others with similar form factor
    Max Diameter of 1.5” (active element in the top 3” of the sensor)
  • Interface: MCBH-8F on Calibrator
  • Frequencies: 10, 26, 70, 100, 250Hz
  • Computation/Display: HP Sensitivity and/or SPL in Box
  • Reference HP: GTI M2, accuracy ±0.1dB
  • Calibration Accuracy: ± 0.25dB
  • Display: Basic 16×2 character LCD
  • Calibration Data Storage: Internal EEPROM
  • Software: GTI HP Connection
  • Communication: Serial via USB-B port on Calibrator
  • Power: Internal 12V NiMH Rechargeable Battery

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