HP 54540 Series - Page 245

Measurements
Timing Definitions
Timing Definitions
Once the edges and transition points have been defined, timing
measurements are made. Timing measurements are made on the first rising
or
alling edge on the display.
Rise time = time at the upper threshold — time at the lower threshold on
he first rising edge
Fall time = time at the lower threshold — time at the upper threshold on
he first falling edge
Period = If the first edge is rising
then period = mid-threshold crossing of second rising edge —
mid-threshold crossing of first rising edge
else period = mid-threshold crossing of second falling edge —
mid-threshold crossing of first falling edge
Frequency = 1/period
+Width = if first edge is rising
then +width = mid-threshold crossing of first falling edge —
mid-threshold crossing of first rising edge
else +width = mid-threshold crossing of second falling edge —
mid-threshold crossing of first rising edge
—Width = if first edge is rising
then —width = mid-threshold crossing of second rising edge —
mid-threshold crossing of first falling edge
else —width = mid-threshold crossing of first rising edge ~
mid-threshold crossing of first falling edge
Duty Cycle = (+width/period)(100)
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