7-8
IM 760201-01E
Setting the Trigger Level
The trigger level is the level at which the trigger slope is determined. When the trigger
source passes through the specified trigger level on a rising or falling edge, a trigger
occurs.
• The trigger level can be set to a value from 0.0 to ±100.0%.
• A value of 100% corresponds to half the height of the waveform display. If the zero
level of the input signal is set to the center of the vertical axis, 100% corresponds
to the top of the waveform display, and -100% corresponds to the bottom of the
waveform display. The upper and lower limits of the waveform display correspond to
three times the voltage or current measurement range of each element when the crest
factor is set to 3, and six times when the crest factor is set to 6. When scaling is used,
the upper and lower limits correspond to three or six times the scaled ranges.
• When the trigger source is set to Ext Clk, the trigger level setting is invalid.
Input zero line
(center of the
vertical axis)
100% (300 Vpk)
–100% (–300 Vpk)
• Measurement range: 100 Vrms or 50 Vrms when the crest
factor is set to 3 or 6, respectively.
• Trigger level: 25%
25% trigger level (75 V)
T
Note
• To prevent noise-related errors, the trigger feature has a hysteresis of approximately 2%
when the crest factor is set to 3. For example, when the trigger slope is set to , a trigger
will occur if the input signal level falls approximately 2% below the trigger level and then
passes through the trigger level on a rising edge. The trigger feature has a hysteresis of
approximately 4% when the crest factor is set to 6.
• When integration is in progress or suspended, the trigger feature does not function.
Therefore, the waveform display start point (the signal level at the left edge of the screen)
may not be stable. Also, the numeric data measurement period may not be synchronized
with the waveform data measurement period.
• You cannot set the WT500 to the synchronized measurement slave setting and the trigger
source Ext Clk setting at the same time because both settings use the same connector.
7.5 Setting the Trigger
