YOKOGAWA WT3002E - Page 251

13-17
IM WT3001E-51EN
Cycle-by-Cycle Measurement
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Index
Explanation
• Display When the Cycle-by-Cycle Measurement Is Complete
A display example is shown below.
List display page
Displays the current page number.
Cycle-by-cycle
measurement status
Cycle by Cycle
Synchronization source
for measurement
Measurement cycle count
Measurement cycle number
Detection of peak over-range data
For voltage (U), current (I), speed, and torque, + or - is
displayed in front of the data value if peak over-range
occurs during the measurement of the cycle for which
the data is displayed.
• +: Positive peak over-range
• -: Negative peak over-range
• ±: Positive and negative peak over-range
Hardware detection of peak over-range
Indicated if any hardware peak over-range is
detected during the measurement of all cycles
Note
• If the synchronization source signal is distorted or high-frequency noise is superimposed on
the signal, zero-crossing other than that of the fundamental frequency occurs. As a result,
a range different from the cycle of the fundamental frequency may be measured. If this
happens, turn ON the frequency filter.
• If the level of the synchronization source signal is less than the zero-crossing detection
level, the zero-crossing cannot be detected correctly. As a result, the measured values may
be unstable, or a timeout may occur.
• If the timeout value is shorter than the product of the period of the synchronization source
signal and the measurement cycle count, timeout always occurs, and the measurement
cannot be completed.
• Peak Over-Range Detection
There are two methods for detecting peak over-range.
• Detection by data
Detects peak over-range in the data from the A/D converter during the
measurement of the cycle for which the data is displayed.
• Detection by hardware
Detects peak over-range that cannot be detected using the "detection by data"
method such as pulse noise with a peak width that is shorter than the sampling
interval of the A/D converter.
If a peak over-range is detected, the data of the cycle-by-cycle measurement may not
be correct. Increase the measurement range so that peak over-range does not occur.
13.4 Executing the Cycle-by-Cycle Measurement