Seametrics jWAVE Instructions Manual page 14

OPERATION
Explanation of Recording Times
The sampling rate (time between each recorded flow measurement) and total number of recorded measurements is
controlled by the jWAVE. The maximum possible number of flow measurements is 3750 and each includes five values-
-flow rate, total, velocity, time stamp, and quality. The maximum sampling rate is two seconds.
The jWAVE data logger will attempt to maximize the sampling rate, based on the your selected recording time. For
example, if you select to record flow for one minute, then the jWAVE maximizes the sampling rate at two seconds and
will record 31 flow measurements (covering a total of 60 seconds).
If you select to record flow for four days, then the jWAVE again attempts to maximize the number of flow
measurements; however since there is not enough memory to record flow every two seconds for four days, it
configures the sampling period to maximize the number of flow measurements. For the case of four days, the jWAVE
sets the sampling period at 92 seconds giving you a total of 3716 flow measurements. (Note that because the jWAVE
uses whole seconds to set the sampling period, it is not able to always provide exactly 3750 samples to cover the
specified recording time. )
Length Sample Period
1 minute 2 seconds
1 hour 2 seconds
10 hours 9 seconds
1 day 23 seconds
4 days 92 seconds (1 min. 32 sec.)
10 days 230 seconds (3 min. 50 sec.)
14 days 322 seconds (5 min. 22 sec.)
Seametrics • 253.872.0284
When recording more than 12 hours,
the jWAVE must be connected to an
external power source, such as the
USB power adapter supplied with the
jWAVE.
Page 14
jWAVE INSTRUCTIONS
seametrics.com