Definition
A piece of test equipment that produces an electrical signal of known frequency, waveform, and amplitude, used to test, calibrate, or troubleshoot radio and electronic equipment.
Plain English
A bench tool that creates a clean, controlled electrical signal so a technician can feed it into a radio or instrument and see whether the equipment responds correctly.
Context Anchor
Seen in aircraft electrical, avionics, instrument, and maintenance testing discussions.
Derivation
“Signal” comes from an older word meaning a sign or mark used to communicate something. “Generator” comes from a word meaning to produce or bring forth. Together, the term means a device that produces an electrical sign or output for another system to read.
Why Pilots Care
Properly calibrated radios and navigation systems are essential for safe communication with air traffic control and accurate position information during flight.
Analogy
It is like using a known test tone to check a speaker. If the speaker responds correctly to the known tone, the speaker is probably working.
Intuition Check
A signal generator is not necessarily a radio transmitter. In this context, it means a device that creates a controlled electrical output for equipment to use or for maintenance testing.
Example Sentence 1
The avionics technician connected a signal generator to the VOR receiver to verify it was reading bearings accurately.
Example Sentence 2
Before reinstalling the transponder, the shop used a signal generator to verify the unit responded properly to interrogation signals.