85
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4.4 Trigger Functions
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(1) The period of the signal to be measured
is shorter than the lower limit of the
period trigger. (Trigger slope is set to
UP.)
(2) The period of the signal to be measured
is longer than the upper limit of the
period trigger. (Trigger slope is set to
UP.)
基準電圧
信号の周期
T
下限値例
基準電圧
信号の周期
T
上限値例
When the waveform crosses the trigger level
in the set trigger slope direction before the set
lower-limit period is complete, a trigger
activates at the point where the waveform
crosses the reference voltage.
When the set upper-limit period is complete
before the waveform crosses the trigger level
in the set trigger slope direction, a trigger is
activated where the set upper-limit period is
complete. Therefore, the trigger position
varies depending on the upper limit of the
period range as shown above.
Reference
voltage
(0 V)
Upper limit
example
Signal
period
Reference
voltage
(0 V)
Signal
period
Lower limit example
基準電圧
(0V)
1.00s
1.05s
1.1s
1.2s
T
(周期範囲内)
(周期範囲内)
【周期上限】
(周期範囲外)
0.95s
【周期下限】
Reference
voltage
(0 V)
Lower-limit
period 0.95 s
Upper-limit period
1.1 s
Within the period range Outside the period range
1.00 s
1.05 s
1.2 s
Lower limit: 950 ms, Upper limit: 1.1 s, Level: 0.000 V
NOTE
A trigger may be activated by a period shorter than the actual period of the
waveform due to noise. In such case, set an appropriate low-pass filter. (See 4.3.3)
3. Period Trigger (Level, Slope, Upper limit, Lower limit)
When using the period trigger, the period between rises (or falls) of a
reference voltage is measured and a trigger activated when a waveform
deviates from the period.
To set the period trigger, the reference voltage level and period range must
be set.
With the period trigger, the 8730-10, 8731-10 monitors the period for
which a waveform crosses the set reference voltage and, if the period
deviates from the set range, a trigger is activated. The position where a
trigger is activated varies depending on the set period range and period of
the signal to be measured.
(Setting Example)
To activate a trigger when the waveform period deviates from the range
between 0.95 s and 1.1 s:
