Description
HVI VLF-12011CMF Hipot Tester Repair
The HVI VLF-12011CMF is a 120 kV sinusoidal VLF cable hipot from High Voltage Inc. — a high-voltage true-sine (filtered) 0.1 Hz withstand set for higher-class cable, meeting IEEE 400.2 sine-wave requirements. At this voltage and with a clean-sine requirement, the VLF generator and control system carry significant stress.
June Company repairs and calibrates the VLF-12011CMF for utilities and contractors on high-voltage cable testing.
Common VLF-12011CMF problems we fix
- Won’t reach 120 kV or sine collapses — VLF generator/output-stage failure, rebuilt for full clean output.
- Waveform distortion — regulation faults degrading the true-sine output, corrected to IEEE 400.2.
- Control system faults — the control electronics, repaired.
- Metering drift — recalibrated to spec.
- Internal HV arcing or interlock faults.
FAQs
My VLF-12011CMF won’t reach voltage after a flashover — fixable? Yes. HV output-stage damage from a flashover is the most common fault; we rebuild it so the set delivers full 120 kV sine output, verified with a NIST-traceable certificate.
Is the sine waveform checked? Yes — verified against IEEE 400.2 tolerances.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or submit a service request.






