Description
Fluke 1550C Insulation Tester Repair
The Fluke 1550C 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, along with the measurement circuit.
June Company repairs and calibrates the Fluke 1550C for motor shops and electrical maintenance crews.
Common Fluke 1550C problems we fix
- HV generator faults — won’t reach the selected test voltage or output is low, repaired so it hits full 5 kV.
- Measurement drift — insulation-resistance readings drifting or unstable, recalibrated against standards.
- Diagnostic ratios not calculating — PI/DAR functions, restored.
- Display, battery, or terminal faults — repaired.
- Won’t power on — power/battery faults.
FAQs
My 1550C 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 submit a service request.








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