YOKOGAWA wt3000, Руководство пользователя, Страница: 191 / 384

6-10
IM 760301-01E
• Input Circuit for the External Trigger Signal and Time Chart
External trigger
signal
External trigger
100
Ω
+5 V
Minimum pulse width
Trigger delay time
Internal trigger
EXT CLK
(when set to )
• Selecting the Trigger Slope
The up and down movement of a signal level is called a slope. When the slope is
used as one of the trigger conditions, it is called a trigger slope. You can select the
trigger slope from the following:
• : The trigger occurs when the trigger source signal rises above the trigger level
from a lower level.
• : The trigger occurs when the trigger source signal falls below the trigger level
from a higher level.
• : Trigger occurs on both the rising and falling cases.
• Setting the Trigger Level
Trigger level refers to the level through which the trigger slope passes. When the
slope of the trigger source passes through the specified trigger level on a rising or
falling edge, a trigger occurs.
• The level can be set in the range of 0.0 to ± 100.0%.
• Half of the total vertical span of the waveform display screen is considered to be
100%. With the vertical center of the screen taken to be the input zero line, the
upper and lower limits of the waveform display screen are 100% and –100%,
respectively. If the crest factor is set to 3, the upper and lower limits of the
waveform display screen correspond to three times the measurement range (if
scaled, the range after scaling) of the voltage/current that is set for each element.
Likewise, if the crest factor is set to 6, the upper and lower limits correspond to six
times the measurement range.
• The trigger level setting is void when the trigger source is set to Ext Clk.
Input zero line
(Vertical center)
100% (300 Vpk)
–100% (–300 Vpk)
• Measurement range: 100 Vrms when the crest factor is 3,
50 Vrms when the crest factor is 6
• Trigger level: 25%
Trigger level 25% (75 V)
T
6.4 Setting the Trigger