Status: ST Series Current Production — 3xxx Series varies. We repair and calibrate all of them.
Common Hioki Safety Test Equipment Problems We Fix
- Hipot won’t output high voltage / fails to trip — output transformer or switching relay failure
- Ground bond won’t reach test current — high-current output stage degradation
- Leak current readings drifting or out of spec
- Impulse winding tester won’t fire or detect faults (ST4030A)
- Scanner channels intermittent or not switching — relay contact wear (3930)
- Battery insulation readings off (BT5525)
- Display or front panel not responding
- Won’t communicate over interface / won’t power on
Don’t see your exact problem? We repair all Hioki safety test equipment faults — email us and describe what’s happening.
Hioki Safety Test Equipment Models We Repair
| Model | Description | Service |
|---|---|---|
| Hioki ST5680 | AC/DC hipot tester, production | Request Repair |
| Hioki 3174 | Programmable insulation tester | Request Repair |
| Hioki 3153 | Automatic insulation/withstand tester | Request Repair |
| Hioki ST5541 | Leak current tester | Request Repair |
| Hioki ST5540 | Leak current tester | Request Repair |
| Hioki 3157 | Ground bond tester, up to 30 A | Request Repair |
| Hioki 3930 | High voltage scanner | Request Repair |
| Hioki ST4030A | Impulse winding tester | Request Repair |
| Hioki BT5525 | Battery insulation tester | Request Repair |
How to Send In Your Hioki Safety 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 Hioki safety test equipment 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 Hioki repairs are finished within 5–10 business days of arrival, with expedited turnaround available if you need it back fast.
My hipot tester won’t output high voltage or won’t trip — can you fix it?
Yes. Output transformer and switching relay failures that stop the hipot from producing voltage or detecting a fault are among the most common repairs on the ST5680, 3153, and 3174, and they’re fully restorable.
My readings are drifting or out of spec — can you recalibrate it?
Yes. We verify every critical parameter against our reference standards and return the instrument with NIST-traceable results on a certificate.
My ground bond tester won’t reach test current — is that repairable?
Yes. High-current output stage degradation on the 3157 that prevents it from reaching the set test current is a routine repair, restored for reliable protective-earth verification.
Do you repair the ST4030A impulse winding tester and the 3930 scanner?
Yes. We repair impulse generator output faults on the ST4030A and worn scanner relay contacts on the 3930, along with the full safety test range.
Do you service the BT5525 battery insulation tester?
Yes. We repair and recalibrate the BT5525, including measurement circuit drift affecting battery pack and module insulation readings.
What if my exact model isn’t listed?
We service every Hioki safety test equipment configuration. If your model isn’t in the table, pick the closest match or email us — the process is the same.
Who uses Hioki safety test equipment?
Electronics manufacturers, medical device producers, motor and transformer makers, battery pack assemblers, appliance production lines, and UL/IEC compliance test teams rely on Hioki for production safety testing.
