Definition
In a digital electronic circuit, the speed at which a signal transitions from one logic state to another, measured as the rate of voltage change over time on the rising or falling edge of a pulse. A faster edge rate means the signal switches between low and high voltage levels more quickly.
Plain English
How quickly an electronic signal jumps from off to on, or on to off. A fast edge rate means the switch happens almost instantly; a slow edge rate means it takes a little longer to make the change.
Context Anchor
Seen in avionics, electrical system, and signal troubleshooting discussions, especially when checking whether electronic equipment is sending a clean, readable signal.
Derivation
The 'edge' refers to the steep rising or falling line you see when a digital pulse is drawn on a graph — the vertical part where the signal changes state. 'Rate' is simply how fast that change happens. Together: how steep the edge is.
Why Pilots Care
Helps pilots judge speed and height using vision alone when instruments may not be primary.
Analogy
Think of a light switch. A clean, quick snap from off to on is like a fast edge. A slow, uncertain movement between off and on is like a slow edge that may be harder for electronic equipment to read clearly.
Grounding Statement
On a signal graph, a nearly vertical side shows a fast edge rate, while a more slanted side shows a slower edge rate.
Intuition Check
Edge rate is not about the edge of a runway, wing, or chart. Here, an edge is the changing side of an electrical signal as it moves from one voltage level to another.
Example Sentence 1
The avionics technician noted that the new digital bus had a faster edge rate, which improved data accuracy but required better shielding to prevent radio interference.
Example Sentence 2
A sudden rise in edge rate alerted the pilot that groundspeed was too high for the short runway ahead.