Status: The HVI VLF Series very low frequency cable test systems are in current production. We repair and calibrate all of them.
Common HVI VLF Series Problems We Fix
- Won’t reach test voltage / output low or unstable — HV output stage failure after a cable flashover
- Waveform distorted or off-shape — voltage regulation circuit degradation
- Tan delta or PD diagnostics reading wrong / not working (E models, TD-34E, TDB-60)
- HV cable or reactor arcing / insulation breakdown
- Control processor or display not responding
- Battery won’t hold a charge / charger faults on portable units
- Cooling system noisy or failed from sustained high-output testing
Don’t see your exact problem? We repair all HVI VLF Series faults — email us and describe what’s happening.
HVI VLF Series Models We Repair
| Model | Description | Service |
|---|---|---|
| HVI VLF-200CMF | 200 kVpeak VLF cable tester, filtered | Request Repair |
| HVI VLF-12011CMF | 120 kVpeak VLF cable tester, filtered | Request Repair |
| HVI VLF-90CMF | 90 kVpeak VLF cable tester, filtered | Request Repair |
| HVI VLF-65CMF | 65 kVpeak VLF cable tester, filtered | Request Repair |
| HVI VLF-65E | 65 kVpeak VLF sine wave with diagnostics | Request Repair |
| HVI VLF-6022CM | 60 kVpeak VLF cable tester | Request Repair |
| HVI VLF-50CMF | 50 kVpeak VLF cable tester, filtered | Request Repair |
| HVI VLF-4022CM | 40 kVpeak VLF cable tester | Request Repair |
| HVI VLF-34E | 34 kVpeak VLF sine wave with diagnostics | Request Repair |
| HVI VLF-30CM | 30 kVpeak VLF cable tester | Request Repair |
| HVI VLF-28CM | 28 kVpeak VLF cable tester | Request Repair |
| HVI TD-34E | VLF tan delta diagnostic test set | Request Repair |
| HVI TDB-60 | VLF cable test set with diagnostics | Request Repair |
How to Send In Your HVI VLF Tester
- Tell us what’s wrong. Email us or submit a service request with your model and the problem.
- Ship it to us. Send your instrument from anywhere in the US — we provide prepaid shipping labels on request.
- Get a firm quote. We evaluate it and send a no-obligation repair quote. No work is done until you approve.
Email: info@junecompany.com | All repairs include NIST-traceable calibration and a 90-day parts-and-labor warranty.
Frequently Asked Questions
How much does HVI VLF Series repair cost?
Repairs start with a flat evaluation fee that’s credited toward your repair cost. After we diagnose the instrument, you get a firm quote before any work begins — no surprises.
How long does the repair take?
Most HVI VLF repairs are finished within 5–10 business days of arrival, with expedited turnaround available if you need it back fast. High-voltage sets with output-stage damage can run longer — we’ll tell you up front with the quote.
My set won’t reach test voltage after a cable flashover — can you fix it?
Yes. HV output stage failure from a cable flashover event is one of the most common faults on these testers, and it’s fully restorable to rated output.
The output waveform looks distorted — is that repairable?
Yes. Voltage regulation circuit degradation that distorts the cosine-rectangular or sine waveform is a routine repair, restored so the output meets its intended shape for valid VLF testing.
My tan delta or PD diagnostics are reading wrong — can you service the E models and TD sets?
Yes. We repair and recalibrate the diagnostic measurement circuits on the sine-wave E models, the TD-34E, and the TDB-60, so tan delta and partial discharge results stay trustworthy.
My readings are drifting or out of spec — can you recalibrate it?
Yes. We recalibrate output voltage and metering against our reference standards and document the results on a NIST-traceable certificate.
My portable unit won’t hold a charge or won’t power up — is that repairable?
Yes. Battery and charger system faults on the portable VLF units are common and fully repairable, restored for reliable field operation.
What if my exact model isn’t listed?
We service every HVI VLF configuration, including the CM, CMF filtered, and E sine-wave diagnostic variants. If your model isn’t in the table, pick the closest match or email us — the process is the same.
Who uses the HVI VLF Series?
Electric utilities, cable testing contractors, underground distribution maintenance crews, high-voltage cable installers, and NETA-certified testing companies rely on the VLF Series for IEEE 400.2-compliant withstand and diagnostic testing of XLPE and EPR cable. For full manufacturer specifications, see the High Voltage, Inc. VLF product page.
