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Good news | Southern LCS participated in the "26e42 Grounding Resistance" capability verification and obtained satisfactory results
Author.
LCS
Source:
Post time:
2026-10-14
CBTL南方立讯检测实验室参加国际能力验证提供者IFM Quality Services Pty Ltd组织的《26e42接地电阻》能力验证验证，并获得满意结果。
The CBTL Southern LCS testing lab has observed that we have achieved excellent results in the proficiency testing No. "26e42 Earth Resistance" provided by the organizer IFM.
能力验证是实验室认可机构、管理部门判定实验室能力的重要技术手段，也是实验室重要的外部质量保证手段。通过定期参加能力验证试验，有效地检验了我司实验室在检验检测结果的准确性和科学性，为客户出具可靠数据坚定了信心！
The proficiency testing activity serves as a crucial technical tool for laboratory accreditation bodies and management departments to assess the competence of laboratories, while also functioning as an essential external quality assurance mechanism. By actively participating in regular proficiency testing activities, we have successfully validated the accuracy and scientific validity of our laboratory's test results, thereby enhancing our confidence in delivering reliable data and test reports to our clients.
Analysis of Capability Verification Techniques:
1. Regarding the "four line method" measurement
Many laboratories answer the "two wire method" in the survey form, usually using the "four wire method" for measuring small resistances. It is an effective means to eliminate the influence of contact resistance on the measurement results, while the "two wire method" is difficult to eliminate the errors caused by contact resistance.
2. Test clamp clamping issue
The measurement principle of the "four wire method" for micro resistance requires that the four test clips should not be clamped arbitrarily. If two voltage test clips are clamped on two current test clips, it is actually equivalent to a "two wire method" measurement. If the contact resistance is high, it is very easy to cause inaccurate test results. Not clamping the terminals of the sample tightly can also lead to biased test results.
3. The problem of excessive zero resistance value
When testing the short-circuit calibration of the terminal with "0", it is generally believed that a resistance value below 3 milliohms is better. If the zero resistance value is large, reaching 12m Ω, 15m Ω or even larger, it may be a problem with the test wire or connection terminal, and should be repaired or replaced. At the same time, the zero position value should also be measured and corrected to meet the precise measurement of small resistors.
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