Description
Fluke 1503 Insulation Tester Calibration and Repair
The Fluke 1503 is an insulation resistance tester (megohmmeter) — it applies selectable DC test voltages and measures high insulation resistance for motors, cables, and wiring. The hardworking part is the high-voltage generator, so that’s where most faults originate.
FlukeMeterRepair.com repairs and calibrates the Fluke 1503 for electrical maintenance and field-service teams.
Common Fluke 1503 problems we fix
- HV generator faults — won’t reach the selected test voltage or output is low, repaired and recalibrated.
- Insulation-resistance measurement out of spec — the measurement drifting, recalibrated against standards.
- A function dead — a measurement or test-voltage path failed, repaired.
- Display, terminal, or battery faults — repaired.
- Won’t power on — power faults.
FAQs
My 1503 won’t reach test voltage — fixable? Yes. HV generator faults are the usual cause and they’re repairable, then verified so the tester delivers full rated voltage and your readings are valid, with a NIST-traceable certificate.
Is the measurement verified? Yes — test voltage and resistance are checked against our standards.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or request service.




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