I am using a 4-channel thermologger (AZ Instruments model #88598) that uses K-type thermocouples. The data is fine for about half of the day, but between about 8pm and 9am (overnight), all 4 channels rise and fall in a sine pattern with a period of about 40 minutes and an amplitude of ~5 degrees F. Three of the thermocouples are in salt water (marine aquariums), and one is in the air measuring room temperature. The data logger is running on 4 AA batteries and is not near any electrical wires.
Does anyone have any idea what might be causing this noise?
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