Eureka Manta Manual Page 42 of 67
E DATA LOGGING
Batteries loaded backwards (reversed polarity) can damage any battery pack and may cause
pressure to build up inside the battery pack. So please pay careful attention to the polarity
markers found on all Eureka battery packs.
E.1 What’s the difference between “Logging” and “Snapshot”?
“Logging” always refers to unattended data capture and storage in the Manta. “Snapshot” refers to the
manual capture of data into your Data Display (PC or small-screen device).
E.2 Why We Do Logging the Way We Do
Lesser manufacturers may require that you type in long strings of digits to specify start time, start date,
end time, end date and logging interval. One wrong digit and you might get no data. The Manta requires
only that you click one Hot Button, install batteries, and (for Manta 35 and 40 models) flip the battery-
pack switch to “ON”. No typing. Once this is done, the red LED will blink five times to confirm that Logging
is activated, and the green LED will blink briefly to confirm that the Manta is receiving adequate voltage
to start Logging. It’s fast and fool-proof.
Another user-friendly feature of the Manta Logging time uniformity. For instance, if your logging interval
is 15 minutes and you turn Logging on at five minutes past 10 AM, your first data will be logged at exactly
10:15, and then every 15 minutes thereafter. If your logging interval is one hour and you turn Logging on
at five minutes past 10 AM, your first data will be logged exactly at exactly 11 AM, and then every hour
thereafter. Your data are cleaner, and it’s easier to match times if you wish to merge data logs.
E.3 Sensor Warm-Up
Your Manta knows the warm-up times required for all the sensors you have enabled. It figures out exactly
when to turn the various sensors on so that a frame of data can be taken exactly at the correct time. For
instance, the HDO Dissolved Oxygen sensor takes 20 seconds to warm up and the turbidity sensor takes
25 seconds to warm up. So, the Manta turns on the DO sensor 20 seconds, and the turbidity sensor 25
seconds, ahead of the time data is required. This minimizes power consumption.
E.4 Setting Up Logging Runs, Logging File Management, Logging Interval
These Manta logging functions are software-driven and explained in Section C.5.b.
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