Description
Megger ST16-1500 Cable Fault Locator Repair
The ST16-1500 is a surge-test / thumper unit in the same fault-location family — it impresses high-voltage surges onto a cable to break down and pinpoint faults, often working alongside a prelocation TDR. As HV discharge equipment, what fails is the energy-storage and HV-generation side, plus the switching that delivers each surge.
June Company repairs and calibrates the ST16-1500 for cable crews and municipal power departments locating underground faults.
Common ST16-1500 problems we fix
- No surge output / won’t thump — HV generation or surge-capacitor failure, repaired so the unit stores and releases full energy.
- Surge too weak to break down the fault — discharge-switch wear or capacitor degradation reducing delivered energy, restored.
- Voltage won’t hold or ramps wrong — HV supply regulation faults.
- Internal HV arcing — insulation breakdown from cumulative high-voltage stress.
- Control/safety interlock faults — the sequencing and interlock circuits that keep discharge operation safe.
FAQs
It won’t produce a surge — worth repairing? Yes. The HV supply, capacitor, and discharge switch are all serviceable, and a repair is far cheaper than a new thumper. We restore full surge energy and verify safe operation.
Do you check it works with my prelocation gear? Yes — we verify the surge and prelocation functions so the full fault-location workflow operates.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or submit a service request.







