The logger is shutting off prematurely.

A discharge of static electricity may cause a running logger to stop recording. Precautions should be taken to prevent this while handling the logger.

Discharges may occur in the following situations:
When there is a charge difference between the logger and a cable being connected to it or a person touching an exposed jack.

Precautions include:
Equalize the charge between yourself and the logger before contact. Charge buildup often occurs from walking across a carpet, especially when the humidity is low. Wool, nylon, or polyester clothing increases the charge build up. Touching a grounded metal object such as a water pipe will dissipate the charge and prevent sparking. When plugging in a cable, handle the plug by the insulated part to reduce charge transfer to the logger. Do not touch the exposed metal connector shell of the logger. When using external voltage or current cables, connect the cable to the sensor circuit first before plugging into the logger.

On outdoor/industrial loggers, minimize contact with the board when installing cables. (When outdoors, shoe charge buildup is probably less of a problem, but touching the ground first is a good idea.)

When changing the battery, ground yourself before opening the logger and maintain contact with the board during the whole process.

Static discharge may not appear right away; it could affect the logger anytime during deployment.

Be careful when transporting loggers. When loggers are launched and transported in bags (especially plastic and nylon), a static electrical charge can be generated and discharged to a logger. To avoid this, use anti-static bags to transport the loggers and prevent the introduction of static to the loggers.

Although we do not have the facilities for testing all environments where static electricity can interfere with logger operation, feedback from customers has assisted us in developing the following list of potential issues:

ESD
1. Electrofishing
2. X-Ray machine
3. Exposure to an extremely strong magnetic field / overhead power lines
4. Electrical/Lightning Storms

It is always important to check the status of the LED on the logger to verify operation and to have the equipment and software available to relaunch the loggers if necessary. In addition, check to make sure that the battery holder was not damaged or loosened when the batteries were replaced. If the battery connection is not tight, the logger can shut off.