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The effects of electroshock fishing on underwater loggers
Although we have not tested this, we have run into incidents in the past where customers have left data loggers in this situation and have not had a problem. On the other hand, we have also had customers whose data loggers stopped recording. It is a gamble and strictly up to you. We do suggest that you pull the data loggers up to be on the safe side, or at least check them after to make sure that they are still recording.
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Cleaning Optic StowAway/StowAway TidbiT data loggers
Do not use any type of chemical on an Optic or TidbiT data logger! You can wash the data logger with a mild soap and warm water solution. If the data logger has a mineral or algae build-up that will not come clean, do not scrape it off. Instead, use a plastic polish, such as Novice.
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Logger power failure and data loss
The data is stored on non-volatile EEPROM. For data loggers with external batteries: change batteries and offload data, then relaunch normally. For data loggers with internal batteries: as long as the EEPROM has not been damaged, the data can be retrieved by Onset. Please contact the place of purchase for a return authorization number and request data back service.
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Optic logger communication problems
All Users: HOBO Optic data loggers must be inserted into the Base Station (or Shuttle) using the appropriate coupler for that logger in order for the computer to detect them. Note: HOBOware will not detect the Base Station alone as an attached USB device.
Check to make sure that the coupler is positioned properly and the magnet end is closest to the data logger, not the Base Station or the Optic Shuttle.
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Rapid battery consumption (outdoor loggers)
All Users: Check both the logging and the sampling interval to make sure they are greater than one-minute intervals. For example, with a sampling interval of one second, the HOBO logger is constantly on and there is a constant drain to the batteries. If your application calls for such an interval, you may need to replace the batteries more frequently
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Maximum sensor cable length
The entire network (all sensors combined) cannot exceed 100 meters. As long as your total cable length is below this, it does not matter how you designate the individual cable lengths. It is important to insure that the connections are weatherproof.
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USB popup errors on Windows XP
Open HOBOWare, plug the logger back in, then click on Start->Settings->Control Panel->System. Click on Hardware->Device Manager and look for the logger listed under: Other Devices or Human Interface Devices — there could be a minus sign beside one of the categories or a yellow exclamation point through the device. The description listed should indicate if it is a HOBO or not. If it is not a HOBO, do not uninstall it, as it may be another USB device. Delete the "other device," then unplug the logger, wait 15 seconds, and plug it back in. Follow the onscreen instructions from there.
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Event data logging vs State data logging
A HOBO Event data logger records the opening of the contacts only. It does not record the closing. A HOBO State data logger records changes in the state - both the opening and closing of the switch, (door open/close, light on/off, etc.). Event data will accumulate over time and totalize whereas state data will indicate a high or low position. Some HOBO series support both state and event data logging.
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Light on/off data loggers recording more states than are actually occurring
If you are monitoring fluorescent lights, part of what you are seeing may be due to a fairly common attribute of fluorescent lights. When the filaments of a fluorescent lamp and the gas inside the lamp are not up to the normal running temperature (normally the first few minutes after startup), they are likely to flicker a bit.
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