A record that rises and falls regularly is not random noise: compressor cycling, door movement, defrost or a sensor sitting close to the cooling source can each produce the shape. When the tooth spacing matches the cycle of a field event, the data is showing behaviour.
- Calculate the time between each peak and trough.
- Put the results on the same timeline as deliveries, breaks and door movements.
- Run a comparison trip without moving the sensor.
The logging interval is a setting to check as well: the sample profile in the WHO guide takes one reading every 10 minutes, and a cycle shorter than 10 minutes is not drawn correctly. If the spacing matches no event, inspect sensor contact and recording settings before changing the thermal design; if it follows the operation, manage how often the container is opened and how long it waits.
