Teledyne 440, System Manual, Page: 132 / 256

6 – Operating Procedure
6-28 © Teledyne TSS DPN 402196 Issue 4.1
Figure 6-4: Vertical range with weight coating thickness
B) Co-ordinates Format
The string length is dependent upon the output resolution selected via the external output configuration
dialog box. If centimetre resolution is selected, the string will be 20 characters in length. To
accommodate for the additional resolution, when using millimetre resolution the string will be 24
characters in length. The values in the packet are rounded and it is possible that they will not precisely
match those on the Run Display screen. The individual field definitions are as follows.
Table 6-4: External Co-ordinates format
NOTES
❐
The Start character is a colon – ASCII 3Ah.
❐
‘I’ (ASCII 49h) identifies a co-ordinates data packet.
❐
The lateral offset (LAT) is measured from the centre of the coil array. Positive
values indicate a target to starboard of the centre line. The field will contain
question marks if the target is out of range. If millimetre resolution is used the
field length will be increased by one character to accommodate the addi-
tional resolution.
❐
The vertical range to target (VRT) is the distance between the bottom face of
the coil array and the top of the conductive part of the target. If you have
entered a weight coating thickness using the ‘Target Scaling’ feature of the
software, VRT measurements will be to the top of the weight coating. If milli-
metre resolution is used the field length will be increased by one character to
TARGET
VRT
LAT
Coil
array
centre
line
Weight
coating
thickness
Coil 3 Coil 2 Coil 1
Starboard Port Centre