·
Fall time is the difference
between the time when the signal crosses a high threshold to the time when the
signal crosses the low threshold.
·
The low and high thresholds are
fixed voltage levels around the mid voltage level or it can be either 10% and
90% respectively or 20% and 80% respectively. The percent levels are converted
to absolute voltage levels at the time of measurement by calculating
percentages from the difference between the starting voltage level and the
final settled voltage level.
·
For an ideal square wave with
50% duty cycle, the rise time will be 0.For a symmetric triangular wave, this
is reduced to just 50%.
·
The rise/fall definition is set
on the meter to 10% and 90% based on the linear power in Watts. These points
translate into the -10 dB and -0.5 dB points in log mode (10 log 0.1) and (10
log 0.9). The rise/fall time values of 10% and 90% are calculated based on an
algorithm, which looks at the mean power above and below the 50% points of the
rise/fall times.
Get free suggestion for Online House Design Plans
ReplyDelete