Geonics Limited EM38-MK2 Series

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Summary

Introduction

1.1 Battery Test

Procedure to check and maintain the instrument's battery status for optimal performance.

1.2 Calibration Method for Instrument Zero

Method for calibrating the instrument's zero point to ensure accurate readings.

2. EM38-MK2 OPERATING INSTRUCTIONS - Expanded Method

2.1 Battery Test

Procedure to check and maintain the instrument's battery status for optimal performance.

2.2 Initial Inphase Nulling

Procedure to null the inphase signal to accurately measure ground conductivity.

2.3 Instrument Zero

Adjustment procedure to accurately set the instrument's zero point for conductivity measurements.

2.4 Final Inphase Nulling

Procedure to null the residual signal from magnetic susceptibility for accurate measurements.

2.5 Equipment Sensitivity Checks

Method to check the sensitivity of the instrument to ensure proper functioning.

2.6 Automatic Calibration of EM38-MK2

Details on the automatic calibration setup for the EM38-MK2 using a monopod.

2.7 Marker Switch

Function of the orange push button for data recording and station marking.

3. SURVEY PROCEDURES

4. ELECTRICAL INTERFERENCE

5. NOTES ON SURVEY INTERPRETATION

5.1 Linearity of Response

Accuracy of the apparent conductivity measurements across the instrument's range.

5.2 Relative Response with Depth

How the instrument's response varies with the depth of the material being measured.

5.3 Multi-Layer Calculations

Methods for calculating instrument response for multi-layered earth models.

5.3.1 Variation of EM38 Response with Height

How instrument readings change with variations in height above ground.

5.3.2 Simplified Two-layered Earth Interpretation

Procedure for interpreting data for a simplified two-layered earth model.

6. MEASURING SOIL MAGNETIC SUSCEPTIBILITY

7. OUTPUT UNITS

8. CONCLUDING REMARKS

9. COMMUNICATON WITH EXTERNAL LOGGER

10. OPTIONAL COMPONENTS

10.1 External Battery

Using an external battery to extend the instrument's service life.

10.1.1 External Battery Pack

Details on the optional rechargeable battery pack for extended operation.

10.1.2 External Battery Care

Guidelines for maintaining and caring for the external Pb/gel battery pack.

10.2 Protective Housing

Optional housing for instrument protection from environmental factors and shocks.

10.3 Extender Arm

Collapsible arm for conveniently carrying and operating the instrument.

11. EM38-MK2 INSTRUMENT SPECIFICATIONS

12. APPENDIX

Schematic Diagram of Vertical and Horizontal Dipole Positions

Diagrams illustrating the vertical and horizontal dipole positions for operation and calibration.

Relative Response Curves

Curves showing the relative response of the instrument at different depths.

Cumulative Response Curves

Curves illustrating the cumulative response of the instrument with depth.

Two Layer Curves

Charts for interpreting data for two-layered earth models.

EM38-MK2 RS232 DATA PROTOCOL

EM38-MK2 GAIN CALIBRATION PROCEDURE