NATURAL SOURCE MAGNETOTELLURICS
May 2002 Section 13, Page 18
13.8 RESTRICTIONS
The main restriction on setting up the channels and using this program is to make sure the E-
field channels always precede the corresponding orthogonal H-field channels. In calculating
Cagniard resistivities, the program first looks for an E-field channel, and then matches it up with
the first orthogonal H-field channel that it finds when going down the channel list.
Following is an example for connecting and defining the channels for scalar measurements on 7
separate stations:
This example is similar to scalar CSAMT, measuring E-fields at 7 different stations, with the H-
field antenna placed near the center of the array. This array is normally used for reconnaissance
or E-Map applications.
The numbers 1 through 9 in the ANT field are used as station identifiers for data processing. The
Rx value (not shown above) is commonly used to indicate the location of the GDP. These
numbers can be any value from 0 to 9999999. The number 14 on the CH 8 Hy line indicates
that the calibrates for AMT antenna Serial Number 1 are to be used. This exact number must
identify the calibrates in the AMT antenna calibrate cache.
These two hookup configurations are identical as far as the AMT program is concerned but the
display of the results will be different:
CH Sta/Ant MAG CC/
rho GGGA
1Ex 1
2Ex 2
3Ex 3
4Ex 4
5Ex 5
6Ex 6
7Ex 7
8Hy 14
CH Sta/Ant MAG CC/
rho GGGA
1Ex 1
2Hy 14
3Ey 1
4Hx 24
5OFF
6OFF
7OFF
8OFF
CH Sta/Ant MAG CC/
rho GGGA
1Ex 1
2Ey 1
3Hx 14
4Hy 24
5OFF
6OFF
7OFF
8OFF
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