half amplitude of 3.5µs

Amplitude isn't measured in seconds. What did you really mean ?

Graham

"Eeyore" wrote in message news: snipped-for-privacy@REMOVETHIS.hotmail.com...

ISTR this term refers to the width of a pulse at 50% of the peak amplitude, may be to do with ESD.

Regards Ian

No. The phrase your are looking for is "full width at half maximum" which refers to characterising a smooth unipolar pulse by working out the steady state level (from which the pulse starts and to which it eventually decays) and the maximum (peak) amplitude, then measuring the time that the pulse is closer to the maximum than it is to the steady state value, usually by drawing a line half-way between the stwady state and the maximum voltages and seeing where the pulse cross this line when rising and falling.

--=20 Bill Sloman, Nijmegen

Pulse width is usually measured in scientific journals as "FWHM", full width half max, which is the time between the rising and falling edges, each measured at 1/2 of the peak voltage. For some reason, electrical engineers seldom use this terminology... they just say "pulse width."

John