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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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Error #11 (Either the logger or the data file has been damaged) when downloading files from H09-002-08 Shuttle to computer
It is important that H09-002-08 HOBO Shuttle users check the status of the Shuttle's battery prior to downloading data from a logger.
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Using Keyspan USB-to-Serial Adapter with Onset software other than BoxCar® Pro 4.3
The Keyspan USB-to-Serial Adapter will also work with BoxCar Pro version 4.0, 4.1, and 4.2, but Onset recommends version 4.3 because that includes all the latest loggers and software enhancements, and the upgrade from version 4.0, 4.1, and 4.2 to version 4.3 is available for free.
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Using Onset data loggers if computer has USB ports and no serial port
Onset offers a Serial-to-USB Adapter (http://www.onsetcomp.com/products/cables/adapt-ser-usb) that provides a simple way to connect HOBO and StowAway® data loggers to available USB ports on your computer.
Onset also offers a USB solution with the U-Series Family of data loggers, which interfaces directly with the USB port on your computer.
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Possibility of exposure to chemicals or chemical vapors
This is dependent on the data logger you are using and the chemical and/or concentration of the chemical to which the data logger is exposed. Many chemicals will have an adverse effect on the data loggers and/or the sensors that the loggers utilize. Contact your authorized sales representative with questions regarding specific chemical contact with the data logger that you are using.
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Drying a wet circuit board
If possible, remove the board from the case and the battery from the board. Dry the board completely using a hair dryer. If the board was exposed to salt water, rinse the board with fresh water and then dry the board. You may try inserting a new battery and downloading the data. If you are unable to access the data, or see any sign of corrosion or tarnishing on the board, contact the place of purchase for a return number. The data may be retrievable, and the data logger may be repairable. Charges will apply and are dependent on the amount of damage.
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Protecting data loggers from electrical discharge (ESD)
A discharge of static electricity may cause a running data logger to stop recording. Precautions should be taken to prevent this while handling the data logger. Discharges may occur when there is a charge difference between the data logger and a cable being connected to it or when a person touches an exposed jack.
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A quick temp-accuracy check (ice bath)
We receive many calls requesting information on how to calibrate our data loggers. While our data loggers cannot be calibrated, you can certainly check to see if the data loggers are recording within their specifications. Ideally, testing should be done in a controlled environment. Unfortunately, not everyone has access to this type of environment.
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