Description
Fluke 1550B Insulation Tester Repair
The Fluke 1550B is a 5 kV insulation resistance tester (megohmmeter) — it applies selectable DC test voltages up to 5 kV and measures very high insulation resistance with diagnostic tests (PI/DAR) for motors, cables, and high-voltage apparatus. The hardworking part is the high-voltage generator, so that’s where most faults originate.
FlukeMeterRepair.com repairs and calibrates the Fluke 1550B for motor shops and electrical maintenance crews.
Common Fluke 1550B problems we fix
- HV generator recalibration — won’t reach the selected test voltage or output is low, repaired and recalibrated so it hits full 5 kV.
- Measurement-circuit faults — insulation-resistance readings drifting, repaired and recalibrated against standards.
- Diagnostic-test faults — PI/DAR not calculating, restored.
- Display, battery, or terminal faults — repaired.
- Won’t power on — power/battery faults.
FAQs
My 1550B won’t reach 5 kV — 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.
Are the diagnostics verified? Yes — PI/DAR are checked along with recalibration.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or request service.






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