Timing measurement for contact probes

A transmission system for transmitting a signal (OS; OS1, OS2; OS3) representative of an observation that occurs at a specific instant in time, the transmission system including a first generator (101) for generating a first periodic reference signal (LFS), processing means (102, 103, 104; 96, 107, 109) and a transmitter (105) adapted for transmitting said representative signal (OS; OS1, OS2; OS3) with transmission delay (.DELTA.t1, .DELTA.t2; Δt3) from observation, characterized by a second generator (106; 97 -99) for generating a second reference signal (HFS1, HFS2; VS) when said observation occurs, means processing (102, 103, 104; 96, 107, 109) being adapted to generate a first delay (ΔTL) based on the first reference signal (LFS) and a second delay (ΔTH; ΔTV) based on the second reference signal (HFS1, HFS2; VS), said transmission delay (.DELTA.t1, .DELTA.t2; Δt3) being defined by the sum of said first delay (ΔTL) and said second delay (ΔTH; ΔTV), wherein one of said first and second delays is longer than the other.