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13.3 Setting the Measurement Conditions
13-12
• Setting the Trigger Level
Trigger level refers to a level at 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%.
• The following value is taken 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 value that is 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 value that is six times the measurement
range.
• The trigger level setting is void when the trigger source is set to Ext Clk.
• Measurement range: 100 Vrms when the crest factor is 3,
• Trigger level: 25%
100%(300 Vpk)
Input zero line
(Vertical center)
–100%(–300 Vpk)
Note
•
To prevent erroneous operation caused by noise, the trigger function uses approximately
2% hysteresis if the crest factor is set to 3. For example, if the trigger slope is set to
trigger occurs if the input signal passes through the trigger level on the rising edge after the
input signal level falls approximately 2% below the trigger level. The trigger function uses
approximately 4% hysteresis if the crest factor is set to 6.
•
The trigger settings are common with the waveform display of normal measurement mode.
• Measurement Cycle Count
Set the cycle count for which the cycle-by-cycle measurement is performed in the
following range.
10 to 3000 times
• Measurement Timeout Value
If a given time (timeout value) elapses after the start of the measurement, the measurement
is aborted in the middle. You can set the timeout value in the following range.
1 to 3600 s
Note
•
The time it takes for the cycle-by-cycle measurement to complete is as follows:
Measurement time = P eriod of the synchronization source signal × measurement cycle count
Set the timeout value to a value greater than the time above. A timeout occurs if it takes too
long to measure the specified measurement cycle count such as when the status of the
synchronization source signal changes or if an abnormal condition such as the measurement
does not finish. This allows you to find out that the measurement signal has become abnormal.
If the timeout value is shorter than the measurement time above, a timeout always occurs when
the measurement is started, and the measurement cannot be completed.
•
If a measurement times out, the measured data is not displayed.
50 Vrms when the crest factor is 6
T
+ computation time
Trigger level 25% (75 V)
IM WT3001E-51EN
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