Geonics Limited EM38-MK2, Operating Manual

EM38-MK2 

GROUND CONDUCTIVITY METER 

OPERATING MANUAL 

TABLE OF CONTENTS

INTRODUCTION

1. 

EM38-MK2 OPERATING INSTRUCTIONS - Simplified Method .............................3

1.1 

Battery Test ..............................................................................................................3 

1.2 

Calibration Method for Instrument Zero..................................................................3 

2. 

OPERATING INSTRUCTIONS - Expanded Method ...................................................6

2.1 

Battery Test ..............................................................................................................6 

2.2 

Initial Inphase Nulling .............................................................................................6 

2.3 

Instrument Zero ........................................................................................................7 

2.4 

Final Inphase Nulling ...............................................................................................9 

2.5 

Equipment Sensitivity Checks ...............................................................................10 

2.6 

Automatic Calibration of EM38-MK2 ...................................................................10 

2.7 

Marker Switch ........................................................................................................10 

3. 

SURVEY PROCEDURES...............................................................................................10

4. 

ELECTRICAL INTERFERENCE ................................................................................11 

5. 

NOTES ON SURVEY INTERPRETATION ................................................................11

5.1 

Linearity of Response ............................................................................................11 

5.2 

Relative Response with Depth ...............................................................................11 

5.3 

Multi-Layer Calculations .......................................................................................12 

5.3.1  Variation of EM38 Response with Height .............................................................12 

5.3.2  Simplified Two-Layered Earth Interpretation .......................................................14 

6. 

MEASURING SOIL MAGNETIC SUSCEPTIBILITY ..............................................14

7. 

OUTPUT UNITS ..............................................................................................................15 

8. 

CONCLUDING REMARKS ..........................................................................................15 

 
9. 

COMMUNICATION WITH EXTERNAL LOGGER.................................................16 

 
10. 

OPTIONAL COMPONENT ...........................................................................................16

10.1 

External Battery .....................................................................................................16 

10.1.1  External Battery Pack ............................................................................................16 

10.1.2  External Battery Care .............................................................................................17 

10.2 

Protective Housing .................................................................................................18 

10.3 

Extender Arm .........................................................................................................18 

11. 

INSTRUMENT TECHNICAL SPECIFICATIONS ....................................................19