YOKOGAWA FG420, User Manual

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67 IM FG410-01EN
f) Pulse width, leading edge time, and trailing edge time definitions and limitations
The pulse width, leading edge time, and trailing edge time are defined as shown in the following
figure.
0%
10% 10%
50% 50%
90% 90%
100%
Pulse width
Period
Trailing edge time Leading edge
time
However, the setting ranges of the pulse width, leading edge time, trailing edge time, and frequency
are mutually limited as follows.
If the following limitations are not met by the frequency or pulse width setting, the leading edge time
and trailing edge time are adjusted first, and the pulse width is adjusted next.
Leading edge time and trailing edge time limitations
The ranges of the leading edge time, trailing edge time, and frequency or cycle are limited as follows.
Largest of 0.01% of period or 15 ns ≤ Leading edge time
Largest of 0.01% of period or 15 ns ≤ Trailing edge time
For example, the leading edge time and trailing edge time at 1 kHz are limited to 100 ns or more.
Pulse width, leading edge time, and trailing edge time limitations
The ranges of the pulse width time, leading edge time, trailing edge time, and frequency or cycle are
limited as follows. If the pulse width is set with duty, the value converted to time is used as the pulse
width time.
x
0.85
Leading edge time +
trailing edge time
x
0.85 ≤ ≤ Period -
Leading edge time +
trailing edge time
Pulse width
time
For example, when the leading edge time and the trailing edge time are each set to 100 ns at 1 kHz,
the pulse width time can vary in the range of 170 ns to 999.83 μs.
4.4 Setting Methods for Main Items