By comparing test data, we can analyze the strengths and weaknesses of load curve instruments. A deep analysis of the differences between key load curve meters is essential, especially when there are so many high-quality switch load curve meters available on the market. The price range varies greatly—some models differ by thousands or even tens of thousands of dollars, which often leaves customers confused. In this article, I will explain how to evaluate the quality of a key switch load curve meter.
First and foremost, it's crucial to choose the right manufacturer. In my previous article, I discussed the difference between manufacturers and distributors, but that won't be repeated here. Second, you should verify whether the supplier has relationships with major brand clients. Customers should communicate directly with suppliers and conduct on-site inspections if possible. It’s also important to request to see relevant certificates, such as patent certifications. Patent certificates indicate that the manufacturer has independent R&D capabilities.
Additionally, check the test machine prototype and examine the data acquisition cable. A multi-pin design indicates a higher sampling rate, more accurate testing, and better protection for the sensor. Also, ensure that the sensor has foolproof protection and that calibration requires a password.
The above points have been covered in detail. Now, let me focus on the technical aspects that professionals can use to identify the quality of a testing machine. When testing general products, the quality of the machine may not be immediately noticeable. Think of it like driving a car on a flat road—both good and poor cars perform similarly. However, the real difference comes when facing uneven roads. For button switches, the most critical parameter is the "hand value," which is calculated from the peak and valley values of the waveform.
Some tact switches, potentiometers, and micro-switches have fewer valley points. The waveforms show sharp valleys, and different machines can result in a few percentage points difference in the hand value. As you know, a tester with a high sampling rate can capture smaller valley data, which leads to a higher hand value based on the calculation formula: (peak - valley) / peak.
This image shows the same product tested under identical conditions, yet the measured hand value differs by 3%. This discrepancy occurs because some testers have low sampling rates, leading to higher valley readings and thus a lower hand value.
Domestic millimeter instruments have been compared with Japanese machines and have successfully been exported to South Korea, Japan, and Europe and America. Therefore, it's highly recommended that customers pay close attention when purchasing and understand the internal quality and performance of the testing equipment.
Editor: Hardware Business Network Information Center
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