Cause of empty data log file with LGR-532x loggers (start on power-up mode)
LGR-5325, LGR-5327, LGR-5329 - Early firmware versions for these 3 models have a bug which results in no data being logged to the file, if the mode is set for "start on power-up". All other start modes log data OK. Firwmare rev 1.1B and lower have the issue. The solution is to upgrade your firmware to 1.1C or later. You can update the firmware to the logger yourself. Instructions, and a new firmware file, are located on MCC's website, on the Tech Support page under Firmware Updates.
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