In-Situ Win-Situ 4 / Pocket-Situ 4 Operators Manual - Manual (Page 100)

100
rev. 003 11/04
APPENDIX B: TEST MEASUREMENT SCHEDULES
First Six Seconds of Test
In a true logarithmic sampling scheme, the interval between points would
be infinitely short at time t=0 (the start of the test), which implies infinitely
rapid sampling. The logger cannot sample faster than once every 300
milliseconds (about 3
1 /
3
points per second). Thus, a linear sampling rate of
one point each 300 milliseconds occurs for the first 6 seconds into the
test, then the logarithmic decline begins with the 21st data point at the 6
second mark.