Practical Method For Testing The Conductivity Of Neutral Blocks

The practical methods for testing the conductivity of neutral blocks mainly include the following steps, combined with professional tools and standardized operations, to ensure accurate and reliable test results:

1、 Preparation before testing

Tool selection: Use a high-precision multimeter (such as Agilent brand) or a dedicated terminal tester to ensure measurement accuracy meets the requirements.

Sample processing: Clean the surface of the terminal, remove the oxide layer, oil stains or rust, and avoid errors caused by poor contact.

Environmental control: Detect in a dry and electromagnetic interference free environment, with a recommended temperature of 20-25 ℃ to reduce the impact of environmental factors on resistance values.

2、 Core testing steps

Contact resistance test

Method: Set the multimeter to the resistance range (such as 200 Ω), press the two probes tightly against the conductive parts of the terminals (such as copper sheets or sockets), and record the resistance value.

Standard: The contact resistance of high-quality terminals should be ≤ 50m Ω (refer to the product specification for details). If the resistance value is significantly high, there may be poor contact or material defects.

Tip: Gently shake the probe or terminal to observe if the resistance value is stable. If the fluctuation exceeds 10%, there may be looseness or oxidation issues.

Conductivity test

Method: Use the diode or on/off mode of the multimeter to test whether the two ends of the terminal are conductive (display "0" or buzzer sounds).

Application scenario: Quickly troubleshoot open circuit faults, suitable for batch testing or on-site maintenance.

Temperature Rise Test (Advanced)

Method: Apply rated current to the terminal through a high current generator (such as adjustable DC 0-600A), and monitor the surface temperature rise of the terminal with a temperature recorder.

Standard: The temperature rise should be ≤ 30 ℃ (when the ambient temperature is 25 ℃). If the temperature rise is too high, it may cause overheating due to excessive contact resistance, posing a safety hazard.

3、 Result analysis and processing

Qualification judgment: If the contact resistance is stable and meets the standards, the conductivity is good, and the temperature rise is normal, then the terminal conductivity is qualified.

Unqualified handling: For terminals with high resistance or abnormal temperature rise, it is necessary to check the crimping process, material quality, or replace the terminals to avoid putting them into use.