Raspberry Pi Forums

You guys were very helpful in creating code to generate a nano second pulse here
viewtopic.php?t=67741
What time resolution can the RPi measure a pulse width down to? The clock suggests better than 5 nS but is there hardware like timers that can run that fast to capture a 10 nS pulse. I want to measure pulse widths in the 1 to 5 MHz region so pulse widths of down to 100 nS but with better than 10 nS accuracy. Can the RPi do this in any way?

You might get an improvement using PLLC

Clock sources

0 0 Hz Ground
1 19.2 MHz oscillator
2 0 Hz testdebug0
3 0 Hz testdebug1
4 0 Hz PLLA
5 1000 MHz PLLC (changes with overclock settings)
6 500 MHz PLLD
7 216 MHz HDMI auxiliary
8-15 0 Hz Ground

What sort of things do you want to time?

Repeated events are likely to be easier than one offs.

Hi Joan
Unfortunately it is single isolated pulses I would like to measure like one half cycle of a 2 MHz sine wave so 250 nS. I generate the pulses with a coil and want to measure their duration.
Here is a picture of a typical pulse that is 1300V with X axis scale of 200nS per division.