How to measure?

Testo measuring equipment

How is measuring equipment generally set up?

  1. The probe: Contains the sensor. There are different probe designs for different applications.
  2. Probe shaft with sensor: Converts the physical measurement value into an electrical signal.
  3. The connection cable: Connects the measuring instrument and the probe (sensor).
  4. The measuring instrument: Converts probe signal into display values (AD conversion).
  5. The resolution: Smallest legible subdivision of the measuring unit.
Temperature measuring instrument testo 925

The resolution

In this example, the display shows 22.3 °C, i.e the resolution is 0.1 °C. If 22.34 °C were displayed, the resolution would be 0.01 °C. In digital instruments, the last position in the display can jump by + / - 1 unit. This smallest unit is called a digit.

Example: Display 22.3 °C

Display -1 digit 22.2 °C; display +1 digit 22.4 °C.

The poorer the resolution of a measuring instrument, the greater the effect of a digit jump on the accuracy of the measuring instrument.