BARTINGTON INSTRUMENTS
Page 48 of 61 OM1800/26
Integer
Marker
32700
Start of Header
32701
End of Header
32702
Dummy data
32703
End of Data
32704
End of File
32705
End of Transmission (this will be followed by a two-byte checksum)
20.3. Transmission Format
Each Grid has a 10-integer header containing the conditions under which the data was collected.
The gradiometer readings are transmitted in the order in which they were recorded. Therefore:
•
for a dual sensor gradiometer system, the data for the left hand and right hand sensors will
appear alternately
•
if the Grid was covered using zigzag traverses then the data will represent this traverse
pattern.
The downloading program uses the header information to re-organise the data as if it was
collected with a single system using parallel traverses. The Datalog software allows the header
and data to be saved together or as two separate files.
20.3.1. Header
The format of each header is as follows:
Integer
Number
Value
Meaning
1
32700
Start of header
2
1,2,3 etc
Grid number
3
1 or 2
Number of sensors
4
10, 20, 30, 40
Grid size 10x10, 20x20, 30x30 or 40x40m
5
0 or 1
Zigzag or parallel
6
1 or 10
Range
7
1,2 or 4
lines/m (number of data lines /m)
8
1,2,4 or 8
Samples per metre along traverse line
9
10
Sensor spacing 1m
10
0 to 7
Starting direction: N, NE, E, SE, S, SW, W, NW
11
32701
End of Header
