GDP-32
II
INSTRUCTION MANUAL
May 2002 Section 11, Page 14
NOTE: The data format is changed when the data are placed in the data cache. To obtain E
- H phase for measurements which use more than one E-field for each H-field, you must
manually subtract the H-field phase from the appropriate E-field phase. (This is done
automatically in our data processing software). Apparent resistivities are calculated and saved
on the E-field lines, and the phase difference between the H-field and the nearest orthogonal E-
field is calculated and placed on the H-field line in the cache, as shown on the following page.
NOTE: The calibrations for both magnitude and phase are removed from the final displayed
magnitudes and phases for all channels that are defined for H-field input, as long as a valid
calibrate exists in the calibrate cache for the antenna defined in the Sta/Ant column.
Therefore, you may notice large magnitude and phase differences between E-field and H-field
channels when making system checks that use the same source for each channel. This difference
in magnitude should also be kept in mind when observing received signal levels for field data.
The magnitudes of the H-field channels have been normalized by the coil response. This means
that the signal levels coming into the receiver are different than those being displayed in the data
cache -- the difference being the antenna calibration factor.
Upon pressing
Enter
to save the data (or
Escape
to discard the data), the screen will appear as
follows, with the only difference in screens being the new block number (0098) and the bottom
command line.
0098 CSAMT 0537 12.3 15 Mar 98 09:13:17
Survey Grounded
Tx 1 Rx 3 N OUT
1 Hz 4/ 4 Cycles Tx Curr 1
CH Sta/Ant rho E
φ
φφ
φ
-H
φ
φφ
φ
SEM GGGA
1Ex 3 75.7 1532.9 .13005O
2Hy 142 .10005O
3Ey 3 82.2 1659.5 .11005O
4Hx 141 .12005O
5Hz 50154.4u-1849.6 .11005O
6OFF
7OFF
8OFF
CONT-Take data, ESC-Prev Menu
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