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Tel: (905) 670-9580

Fax: (905) 670-9204

GEONICS LIMITED

E-mail:[email protected]

1745 Meyerside Dr. Unit 8, Mississauga, Ontario Canada L5T 1C6 URL:http://www.geonics.com

EM38-MK2

GROUND CONDUCTIVITY METER

OPERATING MANUAL

GEONICS LIMITED

LEADERS IN ELECTROMAGNETICS

8-1745 Meyerside Drive, Mississauga, Ontario L5T 1C6

Tel: (905) 670-9580 Fax: (905) 670-9204

E-mail:[email protected] Web site:http://www.geonics.com

April 2016

Содержание EM38-MK2

Страница 1: ...sissauga Ontario Canada L5T 1C6 URL http www geonics com EM38 MK2 GROUND CONDUCTIVITY METER OPERATING MANUAL GEONICS LIMITED LEADERS IN ELECTROMAGNETICS 8 1745 Meyerside Drive Mississauga Ontario L5T...

Страница 2: ...er 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...

Страница 3: ...sitions 21 ii Relative Response Curves 22 iii Cumulative Response Curves 24 iv Two Layer Curves 26 v Automatic Calibration Set up 34 vi External Battery Components 35 vii Protective Housing 36 viii Ex...

Страница 4: ...t to a digital recorder optional connected to RS 232 port The EM38 MK2 1 provides simultaneous measurements of ground conductivity Quad Phase and magnetic susceptibility In Phase with one transmitter...

Страница 5: ...To remove the battery undo two thumb screws holding the cover of the battery compartment at the bottom of the front panel A Mallory MN1604 9 volt Alkaline battery or equivalent gives about 5 hours of...

Страница 6: ...otate the Q P zero control until the display reads the value calculated in step 2 In this example it would be 6 mS m Now when you rotate the EM38 to the vertical dipole mode the reading should be 12 m...

Страница 7: ...5 Fig A...

Страница 8: ...TN 6 the EM38 measures ground conductivity by inducing very small electrical eddy currents in the ground and measuring the magnetic field that these currents generate A small transmitter coil located...

Страница 9: ...shall call V Now it can be shown that regardless of any layering in the earth with the instrument at a height of 1 5 meters V should equal twice H conversely if V is not equal to twice H we know that...

Страница 10: ...that this site happens to be a region of very high conductivity say 1 000 mS m to take an extreme example If the conductivity is uniform with depth at an instrument height of 1 5 meters it can be sho...

Страница 11: ...es an additional signal to be picked up by the receiver coil when the EM38 MK2 is located close to or is lying on the surface of the ground Fortunately this signal decreases rapidly with the instrumen...

Страница 12: ...bed in the EM38 MK2 logger manual 2 7 Marker Switch The orange push button switch on the unit front panel can be used during digital data recording to either initiate recording of a data point in manu...

Страница 13: ...rent conductivity reading becomes a maximum when a the instrument is directly over the pipe and b also pointing in the same direction as the pipe These remarks apply in the vertical dipole mode which...

Страница 14: ...irst the near surface material is the more conductive and vice versa If both readings are essentially the same then the conductivity of the ground is essentially uniform to a depth of about 1 5 meter...

Страница 15: ...12 By translating this data as described above on top of the various curves of Fig 4 we see that good agreement is achieved for t 0 3 m and k 2 1 2 Furthermore we note that in the vertical dipole mod...

Страница 16: ...etermine z the thickness of the conductive upper layer Given z use Fig 3 to obtain either Rh z or Rv z whence 1 ah 1 Rh z av 1 Rv z Note that in the event that neither 1 2 or 2 1 it is still possible...

Страница 17: ...MK2 also reads in units of mS m where 28 5 ppt 7 12 for 0 5 m of the secondary field relative to the primary field corresponds to 1 000 mS m The following relation can be used to convert mS m to ppm 1...

Страница 18: ...more detailed description on the use of two communication method is provided in the EM38 MK2 Logger Manual 10 OPTIONAL COMPONENTS 10 1 External Battery A provision is provided on the instrument front...

Страница 19: ...ies will lose 2 to 3 of their charge per month when stored at 20 C Deep Discharge Protection The Dryfit battery unlike conventional lead storage batteries is protected against excessive discharge In t...

Страница 20: ...on the housing cover are to allow for connection to the external battery and to the recording device 10 3 Extender Arm A collapsible extender arm see Figure 11 can be used to conveniently carry the i...

Страница 21: ...recision 0 1 of full scale Primary Field Source Self contained dipole transmitter Sensor Two self contained dipole receivers Intercoil Spacing 1 and 0 5 metres for EM38 MK2 1 metre for EM38 MK2 1 Oper...

Страница 22: ...al Dipole Positions ii Relative Response Curves iii Cumulative Response Curves iv Two Layer Curves v Automatic Calibration Set up vi External Battery Pack and Charger vii Protective Housing viii Exten...

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Страница 40: ...be used to connect EM38 MK2 to other computer or data acquisition system provided that such computer or system has an RS 232 port EM38 MK2 INTERFACE CABLE pin assignment is summarised as follows 3 pi...

Страница 41: ...annel 3 Low Byte Byte 9 Channel 4 High Byte Byte 10 Channel 4 Low Byte Byte 11 Channel 5 High Byte Byte 12 Channel 5 Low Byte Byte 13 Channel 6 High Byte Byte 14 Channel 6 Low Byte Byte 15 FF High End...

Страница 42: ...ivity FOR 1M Channel 4 In phase FOR 1M Channel 5 Temperature FOR 1M Channel 6 Temperature FOR 0 5M DATA INFORMATION for Channel 1 4 160mV 0000HEX OV 8000HEX 160mV FFFFHEX 1mV 8mS m 1mS m 25 6 raw data...

Страница 43: ...n the test coil on The instrument should read approximately 90 mS m for 1 m coil separation and 185 mS m for 0 5 m separation If the reading deviates more than 4 mS m and 8 mS m for 1 m and 0 5 m sepa...

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