In the field of power equipment testing,HLY-IIIThe intelligent circuit resistance tester has become the core tool for measuring switch contact resistance due to its high precision and high current output characteristics. However, frequent handling and dynamic usage scenarios pose serious challenges to the stability of the instrument. This article will analyze how to achieve performance stability from two dimensions: design principles and maintenance plans, and provide scientific maintenance guidelines.

1、 Performance Stability Mechanism in Dynamic Environment

1. Anti vibration structure design

HLY-IIIAdopting a modular circuit layout and integrated chassis design, key components such as power modules and sampling circuits are fixed by shock-absorbing brackets. The connectors are made of military grade gold-plated contacts and equipped with a spring locking mechanism to ensure stable contact resistance in vibration environments0.1mΩWithin. The measured data shows that the instrument is1mAfter the height drop test, the measurement error does not change by more than±0.2%.

2. Temperature adaptive compensation

To address the issue of sudden changes in environmental temperature during transportation, the instrument is equipped with a high-precision platinum resistance temperature sensor to monitor the temperature of the sampling circuit in real-time. Using bilinear interpolation algorithm toADDynamically adjust the sampled values to eliminate the influence of temperature drift. in-10℃to50℃Within a wide temperature range, the repeatability of resistance measurement is better than0.5%.

3. Power management optimization

Using soft start technology to limit the startup surge current, combined with an over temperature protection circuit (set threshold)75℃）To avoid overheating of power components caused by immediate use after handling. Actual testing shows that continuous operation2After hours, the surface temperature of the chassis only increased12℃Ensure long-term stability.

2、 Scientific maintenance plan

1. Daily use and maintenance

Handling specifications: Use specialized shock-absorbing packaging boxes, with the boxes filled insideEVAFoam material to ensure that the displacement of the instrument during transportation does not exceed5mm.

Wiring inspection: Before each use, check the insulation layer of the test wire and replace it immediately if any cracks are found. When using the four terminal method for wiring, ensure that the voltage wire is clamped inside the current wire with a spacing of not less than5cm.

Environmental control: Avoid exposure to humidity levels above80%RHLong term storage in the environment, equipped with an electronic drying cabinet if necessary.

2. Regular calibration process

Standard source comparison: quarterly use0.1Grade standard resistance (such asFLUKE 742A）Perform calibration, the deviation between the measured value and the standard value is greater than or equal to1%Adjust the gain coefficient accordingly.

Functional testing: Execution'50A-100A-200A'Three level current cycling test, record the fluctuation range of resistance value, and ensure compliance with±(0.2%reading+2d)Accuracy requirements.

3. Emergency handling of faults

Data exception: If the displayed value suddenly changes beyond the range20%Immediately check if the voltage input line is oxidized, use120#Polish the contact surface with sandpaper and retest.

No response upon startup: Check if the power socket is properly grounded and measure the fuse（5A/250V）Continuity, replace components of the same specification if necessary.

Printing malfunction: Clean the thermal print head (using isopropanol cotton swabs), adjust the printing density setting to3Level above.

3、 Suggested Maintenance Cycle Table

HLY-IIIThe intelligent circuit resistance tester effectively solves the performance degradation problem in dynamic usage scenarios through the dual guarantee of hardware anti vibration design and software compensation algorithm, combined with a systematic maintenance plan. Practice has shown that strict implementation of the above measures can extend the service life of instruments to8Over years of experience, providing reliable data support for the assessment of power equipment status.