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Geonics Limited
B.2 Conversion F
B.2 Conversion F
B.2 Conversion F
B.2 Conversion F
B.2 Conversion Factors
actors
actors
actors
actors
EM61MK2 has four channels. Channels 1, 2, and 3 are common for Mode 4 and Mode D. Channel
4 in Mode D is named Channel T (it corresponds to Top coil).
The instrument response is converted to output voltage in mV for each sampling channel as given
below.
Channel 1 to 4
-
converted data
DATA1 (to 4)
-
instrument output for each channel as recorded in logger
RANGE
-
range is controlled by the EM61MK2, it can be 1, 10, 100
Standard Unit
-
Mode 4
(One Sensor 1 x 0.5 m or 1 x 1 m)
Channel 1=(DATA1 x 4.8333 x 2)/RANGE
Channel 2=(DATA2 x 4.8333 x 2)/RANGE
Channel 3=(DATA3 x 4.8333 x 2)/RANGE
Channel 4=(DATA4 x 4.8333 x 2)/RANGE
Standard Unit
-
Mode D
(Two Sensors 1 x 0.5 m or 1 x 1 m, Top and Bottom coils))
Channel 1=(DATA1 x 4.8333 x 2)/RANGE
Channel 2=(DATA2 x 4.8333 x 2)/RANGE
Channel 3=(DATA3 x 4.8333 x 2)/RANGE
Channel T=(DATA4 x 4.8333 x 4)/RANGE
if coil is 1 x 0.5 m Channel T is further multiplied by a factor 1.114.
Hand Held Unit
-
Mode 4
(One Sensor)
Channel 1 = 0.902500 x (DATA1 x 4.8333)/RANGE
Channel 2 = 1.363000 x (DATA2 x 4.8333)/RANGE
Channel 3 = 2.026795 x (DATA3 x 4.8333)/RANGE
Channel 4 = 3.018856 x (DATA4 x 4.8333)/RANGE
Hand Held Unit
-
Mode D
(Two Sensors, Top and Bottom coils))
Channel 1 = 0.9025 x (DATA1 x 4.8333)/RANGE
Channel 2 = 1.3630 x (DATA2 x 4.8333)/RANGE
Channel 3 = 2.0430 x (DATA3 x 4.8333)/RANGE
Channel T = 12.152 x (DATA4 x 4.8333)/RANGE
Further each channel is normalized by current following formula:
Standard Unit
Channel = Channel x 3000/Current
Hand Held Unit
Channel = Channel x 1800/Current
where, current is a value represented by
5h
,
5l
, and
6
in EM61MK2 data file (see section B.1)
Summary of Contents for EM61MK2A
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