Definition
A device that measures a physical quantity at a remote location and transmits the measurement, usually by radio, to a receiving station for display or recording.
Plain English
A piece of equipment that takes a reading somewhere far away and sends that reading back to people who need to see it.
Context Anchor
Seen in aircraft testing, engine monitoring, unmanned aircraft operations, and systems that send aircraft data to a ground station or maintenance computer.
Derivation
From the Greek 'tele' meaning 'far off' and 'metron' meaning 'measure.' A telemetry unit literally measures from a distance.
Why Pilots Care
Real-time data from the unit lets test teams detect problems early and adjust flight profiles without waiting for the aircraft to land.
Intuition Check
A telemetry unit is not normally the device that controls the aircraft. Its main job is to measure information and send it somewhere else.
Example Sentence 1
The flight test aircraft was fitted with a telemetry unit so engineers on the ground could watch engine temperatures during the high-altitude run.
Example Sentence 2
During the UAV mission the operator checked the telemetry unit display to verify the aircraft remained within assigned altitude limits.