Manual

June 2004 Isis® Sonar User's Manual, Volume 2 115
2. The following values are computed with the calibration coefficients read from the
file ISIS.CTD:
• Water temperature (degrees C)
• Pressure (psia)
• Conductivity (Siemens per meter)
Multiply Siemens per meter by 10.0 to get mmho/cm)
• Velocity of sound in water
3. If saving data in SEG-Y format, the values are saved in the first and second
channel’s binary trace header as shown in the tables, where first byte in header is
byte 0:
Table G-1. SeaBird’s CTD SEG-Y values in first channel’s binary trace header
long ConductivityFreq bytes 200-203 Siemens per meter *10000
long TemperatureFreq bytes 204-207 stored, times 10000
long PressureFreq bytes 208-211 stored, times 10
long PressureTemp bytes 212-215 stored, times 100
short Turbidity bytes 216-217 Turbidity sensor in volts, times 10000
Appendix G: How Isis Processes CTD Data