HP 8510, Руководство пользователя

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Duty Cycle
The ratio of the time that the pulse is ON to the total Pulse Repetition P erio d. If the pulse
ON and OFF times are equal, the Dut y Cycle is 50 p ercen t.
F or in ternal op eration, the maximum dut y cycle p ercen t limit can b e sp ecied, but the actual
dut y cycle may b e less, dep ending up on the user-sp ecifed pulse width and the time it takes for
the analyzer to set up for the next measuremen t.
Pulse Width
The ON time from the 50 p ercen t p oint on the rising edge to the 50 p ercen t p oint on the
falling edge.
The in ternally-generated Pulse Width can b e set from less than 100 nanoseconds to 40.88
milliseconds.
Rise/F all Time
The pulse transition time:
tr = pulse rise time
The time it takes for the pulse to rise from the 10 p ercen t ON condition to the 90 p ercen t ON
condition.
tf = pulse fall time
The time it takes for the pulse to fall from the 90 p ercen t ON condition to the 10 p ercen t ON
condition.
The normal IF resp onds to rise/fall times of ab out 75 microseconds; the wideband IF resp onds
to rise/fall times of ab out 300 nanoseconds.
Trigger Dela y
The time after pulse ON that the measuremen t is actually made.
In the F requency domain, the T rigger Delay can b e set from do wn to -6 resolution p erio ds
(internal) or +3 resolution p erio ds (external) and up to 40.88 milliseconds. In the Pulse
Prole domain the trigger dela y is automatic dep ending up on the display time span, pulse
width, and n um b er of p oints.
3-2 Principles of Pulsed-RF Netw ork Measurements