Transmission Format - Bartington Grad601 Operation Manual

Integer
32700
32701
32702
32703
32704
32705

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 Value
Number
1 32700
2 1,2,3 etc
3 1 or 2
4 10, 20, 30, 40
5 0 or 1
6 1 or 10
7 1,2 or 4
8 1,2,4 or 8
9 10
10 0 to 7
11 32701
BARTINGTON INSTRUMENTS
Marker
Start of Header
End of Header
Dummy data
End of Data
End of File
End of Transmission (this will be followed by a two-byte checksum)
Meaning
Start of header
Grid number
Number of sensors
Grid size 10x10, 20x20, 30x30 or 40x40m
Zigzag or parallel
Range
lines/m (number of data lines /m)
Samples per metre along traverse line
Sensor spacing 1m
Starting direction: N, NE, E, SE, S, SW, W, NW
End of Header
Page 48 of 61 OM1800/26