Duty Cycle; Pulse Width; Rise/Fall Time; Trigger Delay - HP 8510 User Manual

Duty Cycle

The ratio of the time that the pulse is ON to the total Pulse Repetition Period. If the pulse
ON and OFF times are equal, the Duty Cycle is 50 percent.
For internal operation, the maximum duty cycle percent limit can be speci ed, but the actual
duty cycle may be less, depending upon the user-specifed pulse width and the time it takes for
the analyzer to set up for the next measurement.

Pulse Width

The ON time from the 50 percent point on the rising edge to the 50 percent point on the
falling edge.
The internally-generated Pulse Width can be set from less than 100 nanoseconds to 40.88
milliseconds.

Rise/Fall Time

The pulse transition time:
tr = pulse rise time
The time it takes for the pulse to rise from the 10 percent ON condition to the 90 percent ON
condition.
tf = pulse fall time
The time it takes for the pulse to fall from the 90 percent ON condition to the 10 percent ON
condition.
The normal IF responds to rise/fall times of about 75 microseconds; the wideband IF responds
to rise/fall times of about 300 nanoseconds.

Trigger Delay

The time after pulse ON that the measurement is actually made.
In the Frequency domain, the Trigger Delay can be set from down to -6 resolution periods
(internal) or +3 resolution periods (external) and up to 40.88 milliseconds. In the Pulse
Pro le domain the trigger delay is automatic depending upon the display time span, pulse
width, and number of points.
3-2 Principles of Pulsed-RF Network Measurements