Status: ST Series Current Production — 3xxx Series Vary
Overview
Hioki manufactures a comprehensive range of electrical safety test instruments for production-line compliance testing and component qualification. The ST5680 provides AC/DC hipot testing up to 5 kVAC/6 kVDC with high-speed testing for production throughput. The 3153 automatic insulation/withstand tester combines hipot and insulation resistance. The 3174 adds programmable test sequences. The ST5540 and ST5541 leak current testers measure earth leakage, touch current, and patient leakage per IEC and UL standards. The 3157 ground bond tester verifies protective earth continuity. The 3930 high voltage scanner enables multi-point hipot testing with automated channel switching. The ST4030A impulse winding tester detects turn-to-turn insulation faults in motors, transformers, and coils. The BT5525 battery insulation tester measures insulation resistance of battery packs and modules.
Specifications
| Parameter | Value |
|---|---|
| AC Hipot | Up to 5 kVAC (ST5680, 3153, 3174) |
| DC Hipot | Up to 6 kVDC (ST5680) |
| Ground Bond | Up to 30 A (3157) |
| Impulse Voltage | Up to 3 kV (ST4030A) |
| Leak Current | Per IEC/UL standards (ST5540/5541) |
| Key Features | High-speed production testing, multi-point scanning (3930), winding fault detection (ST4030A), battery insulation (BT5525) |
Models We Repair
Select your model below to request a repair. If your exact configuration isn’t listed, choose the closest match — the evaluation and repair process is the same across all Hioki Safety Test Equipment instruments.
| 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 |
Common Hioki Safety Test Equipment Failures We Repair
- Hipot output transformer or switching relay failures
- Ground bond high-current output stage degradation
- Leak current measurement circuit calibration drift
- Impulse generator output stage failures (ST4030A)
- Scanner relay contact degradation from high cycle counts (3930)
- Battery insulation measurement circuit drift (BT5525)
- Display or front panel failures
- Communication interface failures
- Power supply degradation
Our technicians perform component-level diagnostics on every Hioki Safety Test Equipment unit. We identify and repair the specific failed components rather than replacing entire assemblies when possible, reducing your repair cost and turnaround time.
Calibration
Every Hioki Safety Test Equipment repair includes NIST-traceable calibration. We verify all critical measurement parameters against our reference standards and provide a detailed calibration certificate documenting measured performance against the manufacturer’s published specifications.
Who Uses Hioki Test Equipment?
The Hioki ST5680 / 3153 / 3174 Hipot and Withstand Testers, ST5540 / ST5541 Leak Current Testers, 3157 Ground Bond Tester, 3930 High Voltage Scanner, ST4030A Impulse Winding Tester, and BT5525 Battery Insulation Tester are used by electronics manufacturing, medical device production, motor and transformer manufacturing, battery pack assembly, appliance production, and UL/IEC compliance testing.
Our Repair Process
- Ship Your Instrument: Send your Hioki instrument to our facility from anywhere in the US. We provide prepaid shipping labels on request.
- Free Evaluation: Our technicians perform a complete diagnostic assessment and provide a firm, no-obligation repair quote.
- Expert Repair: Upon approval, we perform component-level repair using OEM-grade parts.
- NIST-Traceable Calibration: Full calibration with documented results across all critical parameters.
- Return Shipment: Your instrument is securely packaged and returned with calibration certificate, repair documentation, and our 90-day warranty.
Request a Repair
Contact us for professional Hioki repair and calibration. Our team is ready to evaluate your instrument and provide a no-obligation quote.
Email: info@junecompany.com | All repairs include a 90-day parts and labor warranty.
