66
Byte 0
(unsigned integer): Number of channels used in the box.
Byte 1
(unsigned integer): Box configuration type: 0- unknown, 1-6Ex, 2-5Ex1H, 3-5Ex1Ey, 4-
3Ex1Ey2H, 5-2Ex1Ey3H
Byte 2
(unsigned integer): Number of Ex channels used in the box.
Byte 3
(unsigned integer): Number of Ey channels used in the box.
Byte 4
(unsigned integer): Number of Hx channels used in the box.
Byte 5
(unsigned integer): Number of Hy channels used in the box.
Byte 6
(unsigned integer): Number of Hz channels used in the box.
Byte 7-14
(
8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa
): battery voltage in Volts
(not used yet)
Byte 15-22
(
8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa
): The northing
coordinates of box (not used yet)
Byte 23-30
(
8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa
): The easting
coordinates of box (not used yet)
Channel description sub-block:
Uses the number of channels for each box (byte 0) of box sub-block mentioned above to
determine how many channel descriptor structures need to be read or written. The size of each
channel descriptor structure is 119 bytes. It contains the following 19 fields;
Byte 0
–Byte 15(
ASCII character string
): Channel definition;
Byte 16
–Byte 31(
ASCII character string
): Calibration file name for H channel;
Byte 32
(unsigned integer): Channel number in seg2 file created by SAS program;
Byte 33
(unsigned integer): Shared pots, 0- no shared pots, 1- share one pot, 2 –share two pots;
Byte 34
(unsigned integer): High pass filter settings, 0-DC coupling, 1-0.1 Hz cut-off frequency 2-
0.01 Hz cut-off frequency
Byte 35
(unsigned integer):low pass setting, 0-weak LP, 1-normal LP, 2-strong LP
Byte 36
(unsigned integer): Gain setting, 0-x0.25, 1-x1, 2-x4, 3-x16
Byte 37
(unsigned integer): bootstrap feedback, 0-disable, 1-enable
Byte 38
(unsigned integer): unused
Byte 39-46 (8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa)
: Easting coordinate
Byte 47-54 (8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa)
: Northing coordinate
Byte 55-62 (8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa)
: Elevation
Byte 63-70 (8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa)
: Azimuth in degree
Byte 71-78 (8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa)
: dipole length (m)
Byte 79-86 (8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa)
: dummy
Byte 87-94 (8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa)
: AC noise level
Byte 95-102 (8 bytes IEEE Float, sign bit, 11-bit exponent, 52-bit mantissa)
: DC noise level
