Megohmmeter Calibration Services

Micro Precision is an ISO/IEC 17025:2017 accredited calibration provider with NIST-traceable reference standards and a network of more than 50 laboratories operating worldwide. Our megohmmeter calibration services support aerospace, defense, electrical utility, and manufacturing programs that depend on documented insulation resistance measurements for safety and compliance.

Megohmmeter is the generic term for an instrument that measures high electrical resistance to verify insulation integrity in wiring, motors, cables, and electrical equipment, and the term is closely related to insulation tester and to Megger, a genericized brand name now synonymous with insulation resistance testing. Readers whose equipment is specifically identified as an insulation tester can review Micro Precision’s dedicated Insulation Tester Services page for that instrument category.

Micro Precision calibrates megohmmeters from a variety of manufacturers, including Megger, Fluke, AEMC, and Chelton, under the same ISO/IEC 17025:2017 accredited process and NIST traceability chain used across our complete Electrical Calibration Services.

Uncalibrated megohmmeters pose a direct safety and compliance risk because they can no longer be trusted to accurately measure insulation resistance in wiring, motors, cables, and electrical equipment. An out-of-tolerance megohmmeter produces readings that appear normal but mask early insulation breakdown, creating a shock or fire hazard and undermining pass/fail decisions in electrical safety testing programs.

ANSI/NCSL Z540.3 requires documented, objective evidence of calibration for measuring and test equipment used in regulated processes. For quality managers, an unbroken calibration record and clear NIST traceability are required for ISO/IEC 17025:2017-based audit readiness. Safety and compliance officers depend on documented insulation resistance testing to demonstrate that electrical equipment meets required safety thresholds before it is placed into or returned to service.

Micro Precision calibrates megohmmeters under ISO/IEC 17025:2017 accreditation with NIST-traceable standards, giving both quality and safety teams a defensible calibration record for every instrument in the field.

Micro Precision calibrates a megohmmeter by testing it against NIST-traceable reference standards across multiple test voltages and resistance ranges, then adjusting the instrument to correct any deviation found. Each unit is inspected on receipt, tested at its rated test voltages, adjusted as needed, and returned with a certificate of calibration documenting as-found and as-left results.

The process for each instrument includes:

1. Receipt and inspection: instrument condition, test voltage settings, and lead or probe configuration are verified on arrival
2. Performance testing: the megohmmeter is tested against laboratory reference standards traceable to NIST across its test voltage and resistance ranges to establish as-found measurement status
3. Adjustment: systematic measurement errors are corrected using calibration methods appropriate to the instrument’s type and range
4. Post-adjustment verification: measurements confirm the instrument performs within required parameters after calibration
5. Documentation: a certificate of calibration is issued, documenting the calibration date, interval, standards used, and as-found and as-left data
6. Return: the calibrated megohmmeter is packaged and returned with its certificate of calibration

Standard and faster turnaround options are available for time-critical programs. Contact our team to discuss current lead times and scheduling.

Micro Precision offers both in-lab and on-site megohmmeter calibration to match your equipment configuration, testing environment, and program timeline. Choosing between the two options depends primarily on whether the megohmmeter is a portable handheld instrument or a permanently installed unit integrated into switchgear, motors, or cable systems.

In-Lab Calibration
Ship your megohmmeter to one of Micro Precision’s ISO/IEC 17025:2017 accredited laboratories for full-capability calibration under controlled conditions, with NIST-traceable results issued on a certificate of calibration.

On-Site Calibration
For megohmmeters installed in switchgear, panels, or systems that cannot be removed from service, Micro Precision sends qualified calibration technicians directly to your facility, serving aerospace, defense, electrical utility, and manufacturing sites nationwide.

Faster Turnaround
Standard and faster turnaround options are available for both in-lab and on-site service. Contact our team to discuss current lead times and scheduling.

Micro Precision calibrates a variety of megohmmeter and insulation-testing instrument types from the manufacturers used across electrical maintenance, utility, and quality control environments.

• Handheld megohmmeters used for field insulation resistance testing
• Benchtop and high-voltage megohmmeters used in laboratory and quality control environments
• Insulation resistance testers used across general electrical maintenance programs
• Motor and winding insulation testers used for motor and generator insulation testing
• Cable insulation testers used for power and control cable testing
• Megger-brand insulation resistance testers and megohmmeters
• Fluke insulation resistance testers and megohmmeters
• AEMC megohmmeters and insulation testers
• Chelton megohmmeters, including the Chelton QB18 megohmmeter

If your megohmmeter model is not listed here, contact our team to confirm support. Micro Precision is also referenced on the Chelton calibration services page and calibrates equipment from a range of manufacturers we calibrate across our electrical calibration services.

Micro Precision delivers ISO/IEC 17025:2017 accredited, NIST-traceable megohmmeter calibration for handheld, benchtop, motor, and cable insulation testing instruments from Megger, Fluke, AEMC, Chelton, and other manufacturers. With more than 50 laboratories serving aerospace, defense, electrical utility, and manufacturing programs, Micro Precision provides the documented calibration record your insulation resistance testing program requires, backed by ANSI/NCSL Z540.3 compliant processes. Submit a request today to discuss your megohmmeter inventory, service level requirements, and calibration options.

Please complete our quick Megohmmeter calibration & repair service request form, and a Micro Precision representative will reach out to you same-day during office hours, or within one business day after office hours. (Mon – Friday 8AM – 4PM PST)