Description
ISA Cap-Cal Calibrator Repair
The ISA Cap-Cal Calibrator is a transformer turns ratio tester – it energises a transformer winding and measures the ratio, excitation current and phase to confirm the windings and the tap changer are intact. The measurement is a ratio, so small errors in either winding measurement compound.
Certified technicians at June Company service the ISA Cap-Cal Calibrator for utility transformer crews, substation technicians, and transformer manufacturers. Every instrument is repaired at component level and verified against reference standards before it ships back, with the measured results documented.
Common ISA Cap-Cal Calibrator problems we fix
- Display, keypad or front-panel faults.
- GPIB, LAN, USB or remote-control faults – which breaks automated test sequences while the instrument still works from the front panel.
- Ratio readings inaccurate – verified across the full range rather than at a single tap, since ratio errors that appear only on certain taps are the ones most often missed.
- Excitation current measurement errors.
- Phase deviation readings incorrect.
- Test lead or clamp faults.
- Output drive stage failure.
- Automatic tap changer sequencing faults.
FAQs
Do you service instruments past manufacturer support? Yes. Much of what we repair is out of support, which is exactly where component-level work earns its keep.
What if it is not economical to repair? We tell you in the quote. The evaluation is free and there is no obligation to proceed.
Every repair carries a 90-day parts-and-labor warranty, with a firm quote before any work begins. Email us or submit a service request.






