WinFrog User’s Guide - Appendix C – Magnetometer / GSM-19 Page 4 of 5
Raw Data String:
800,name,time,magnetic field,signal strength,depth,quality,leakage,tuning,
voltage,altitude
Values no sent by this instrument will be 0.
INSTRUMENT CONFIGURATION DETAILS:
Overhauser Effect:
In a standard proton magnetometer sensor a proton rich liquid is required to produce
a precession signal, while the Overhauser effect sensor must also have a free
radical added to the liquid. The free radical ensures the presence of free, unbound
electrons that couple with protons, to produce a two-spin system. A strong RF
magnetic field is used to disturb the electron-proton coupling. By saturating free
electron resonance lines, the polarization of protons in the sensor liquid is greatly
increased.
The Overhauser effect offers a more powerful method of proton polarization than
standard DC polarization. This means stronger signals are achieved from smaller
sensors, and with less power.
Warning Messages Output from GSM-19:
• Weak Signal
• Gradient Condition
• Poor Reading
• Instrument Mistuned
• No Signal
Specifications:
Resolution: 0.01nT
Accuracy: 0.2nT
Maximum depth for echosounder: Standard Sensor=128m (sensitivity of 0.5m)
Communication: Text (ASCII) or Binary. WinFrog uses ASCII
Maximum Power Consumption: 3.5Watts (typical operation around 1Watt)
Features:
• graphic display that displays real time profiles of data.
• interactive menu
• 0.5MB memory standard
• real-time RS-232 output (and standard, programmable RS-232 high-speed
data transfer (to 38.4 kBps) with ultra-fast raw dump feature)
• continuous radio frequency polarization and special sensors to maximize the
signal-to-noise ratio
• instrument sensitivity
• resolution 0.01 nT
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