Bob

Calibration of insulation testers is essential to ensure their accuracy and reliability when measuring electrical insulation resistance. At Zenith Sales & Calibration, the process typically involves the following steps: ________________________________________ 1. Pre-Calibration Inspection • Visual Inspection: The insulation tester is checked for physical damage, loose connections, or other visible defects. • Battery and Power Supply: The tester's battery or power supply is verified to ensure it operates within its rated capacity. • Basic Functionality Check: Before calibration, basic operations (such as power-on self-tests) are performed to confirm the tester functions correctly. ________________________________________ 2. Environmental Setup • Controlled Environment: Calibration is carried out in a controlled environment with stable temperature and humidity, as these factors can affect readings. • Standards Compliance: Zenith ensures the environment meets standards such as ISO/IEC 17025, which governs calibration procedures. ________________________________________ 3. Reference Equipment • Standard Resistors: High-precision resistors with known resistance values are used to validate the insulation tester's accuracy. • Calibrated Instruments: The reference equipment used for calibration is traceable to national or international standards. ________________________________________ 4. Calibration Procedure • Baseline Reading: The insulation tester's output is compared against the reference values of the standard resistors. • Voltage Output Verification: The test voltages (e.g., 500V, 1000V, 2500V) are measured to ensure they fall within the specified tolerance levels. • Resistance Measurements: The tester is connected to the standard resistors, and its readings are compared to expected values across its range (e.g., 10 M?, 100 M?, 1 G?). • Multiple Tests: The procedure is repeated multiple times to verify consistency and identify any deviations. ________________________________________ 5. Adjustment (If Necessary) • If the tester’s readings deviate beyond acceptable limits: o Software Adjustments: Internal calibration settings may be adjusted. o Component Replacement: If hardware faults are detected, defective components are replaced. ________________________________________ 6. Post-Calibration Verification • Final Check: After adjustments, the tester is re-evaluated to ensure it meets accuracy specifications. • Report Generation: A calibration certificate is issued, detailing: o Equipment ID and model o Reference standards used o Measured results and tolerances o Calibration date and due date for next calibration ________________________________________ 7. Documentation and Compliance • Zenith maintains detailed records of the calibration process to comply with industry standards and facilitate traceability for future audits or inspections. ________________________________________ This rigorous calibration process ensures that insulation testers provide reliable and accurate measurements, supporting their critical role in electrical safety testing and equipment maintenance.