Skip to content NREL Buildings Research National Renewable Energy Laboratory (NREL)
Field Test Best Practices: A Resource for Practical Residential Building Science

Main menu

Compact stand-alone data recorders

Compact data recorders usually measure and record one to four parameter values at fixed time intervals (e.g., every second, every 15 minutes). They often have built-in sensors for temperature, relative humidity, or light; they may also connect to plug-in sensors. A second type of compact recorder is the "state logger", which records the time at which a switch (triggered by the operating current of a load) opens or closes. Compact recorders are relatively low in cost and are convenient when a single parameter is to be measured, when running cables is undesirable, and when transmission of data back to the researchers office isn't required. They're widely used in characterizing building conditions and operation of individual loads.