Secret world of oscilloscope probles article written by Doug Ford and published by Silicon Chip magazine, describes how high frequency oscilloscope probes really work. Most textbooks treat scope probes as a combination of a resistive divider in combination with capacitors to provide an extended frequency response. But as will be revealed, the reality is that they are much more complex in principle. The hidden secret to designing a good 10x oscilloscope probe seems to be to use lossy transmission line cable! Usually the coax cable on probles has been made deliberately lossy, to reduce the effects of end-to-end transmission-line reflections!