CG-3 Description & Test Results - Scintrex

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Figure 5. <strong>Results</strong> of high and low temperature tests. Gravity signal comes directly from the analogoutput of the instrument.10
In the low temperature test the instrument was placed in a test chamber set at –30°C for approximately 4hours. Recording started again as soon as it was removed. The initial readings with the instrument stillcold show an offset of around 0.03mGal. There was no further offset as a result of the 54°C temperatureshock.The pressure sensitivity of the instrument was measured by setting the instrument up in a vacuumchamber with the analog output connected to recorder outside the chamber. The pressure was reducedfrom 1 atm to 0.15 atm and held there for 50 minutes. After some initial noise due to temperaturechanges and pressure sensitivity of the electronic components there was an offset of 0.02 0.03 mGal(fig. 6). A similar response can be seen when the pressure is returned to its initial value.Figure 6. Effect of Pressure ChangeMagnetic field sensitivity was determined by orienting a coil along each of three perpendicular axes andapplying fields of +15 Gauss and 15 Gauss (Fig. 7). The maximum deflection was approximately 0.02mGal.11
Page 1 and 2: SCINTREXThe New Scintrex CG3 Auto
Page 3 and 4: Sensor DesignThe sensing element of
Page 5 and 6: Figure 2. Integrated HousingThe uni
Page 7 and 8: Figure 3. Atypical gravity meter li
Page 9: In cycling mode the corrected gravi
Page 13 and 14: Figure 8. Repeatability - transport
Page 15: ConclusionThe CG3 represents seve

CG-3 Description & Test Results - Scintrex

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