EveryMeasure FAQ

What is a Measure?

A Measure is a collection of data points that represents a physical property. 

• Each Stream contains zero or more measures.
• Measures may contain zero or more data points.
• Each measure has it's own meta data including:
  • Name
  • Color (for charting)
  • Description
  • Label
  • Physical Measurement (temperature, voltage, current, etc)
  • Unit (°C, °F, V, mV, etc) 

It's important to note that unlike a channel on a DAQ device which designates the acquisition source , a Measure represents the physical property being measured.  The source or sources performing the data acquisition may change without impacting the Measure.

For example, one might create a Measure named Office - Outside Air Temperature to log temperature data in °F.  After logging data for several months using a Raspberry Pi with an MCC 134 DAQ hat the hardware could be upgraded to an MCC USB-TC which also logs temperature in °F to Office - Outside Air Temperature.  Changing the hardware does not invalidate data logged by the previous device as long as the new device is configured correctly.

What is a Data point?

A Data Point is the smallest unit of data in EveryMeasure and consists of a timestamp and numeric value.  The timestamp is stored with microsecond resolution and the numeric value is stored using double-precision floating-point format.