Introduction to the Qdmp Determination (Q Dumping) Test Method
HELLO
We have developed a new test method called Qdmp (Q Dumping). This test uses the “area” of waveforms to compare differences between master and test waveforms, enabling accurate determination of product quality. This page explains the mechanism in an easy-to-understand manner, requiring no specialized knowledge.
■ What is Qdmp Judgment?
Qdmp Judgment determines pass/fail by calculating:
・The area of the master waveform
・The area of the test waveform
This method involves calculating each component separately and comparing the two to determine quality. Its key feature is the ability to compare the waveform’s amplitude itself within the same judgment interval, even if there is some misalignment along the time axis (left-right).
◆ Difference from Area Judgment
Qdmp judgment automatically shifts the judgment range to match the waveform’s expansion and contraction during comparison, offering the advantage of being robust against time axis errors.
■ Why Correct Determination is Possible Even if the Primary Peak is Offset
Due to the tester’s specifications, the position of the primary peak waveform may occasionally shift. Under conventional methods, this offset could cause misjudgments.
However, Qdmp determination automatically corrects the judgment interval. If subsequent waveforms match, the test sample can be judged as good.
◆ Testing Utility
Even if a temporary shift occurs in the primary peak, the product itself will be correctly judged as good if it is problem-free, significantly reducing judgment variability.
■ Example of Master Waveform and Test Waveform Comparison
Qdmp Determination Explanation Diagram
Example of Master Waveform and Test Waveform Comparison
◆ Supplementary Explanation (Challenges of Area Judgment)
If the waveform shifts at the first peak, the subsequent waveforms also shift continuously in the time direction. With conventional area judgment, the judgment interval is fixed. This shift causes the area of the test waveform to change, potentially leading to misjudgments even for the same product.
◆Why the Qdmp Test is Effective
The Qdmp test automatically detects the same positions on the test waveform as the zero-crossing point and peak voltage point determined by the master waveform’s L/R. It then aligns the judgment interval to match the master’s conditions. Consequently, even if a shift occurs at the primary peak, the test can correctly determine the product as good if the subsequent waveforms match.
