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Megger S1-568 Insulation Resistance Tester Review
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Megger S1-Series | 5 kV Insulation Testing
Megger S1-568 Insulation Resistance Tester Review
A professional look at Megger’s 5 kV insulation resistance tester for power utilities, service companies, and industrial maintenance teams.
Quick SEO Summary
The Megger S1-568 is a high-performance 5 kV insulation resistance tester designed for demanding field use. It offers up to 35 TΩ resistance measurement, advanced noise rejection, multiple diagnostic test modes, rugged construction, and strong safety ratings for professional electrical testing.
5 kV Test Voltage
Built for insulation testing in utility, industrial, and maintenance applications.
Up to 35 TΩ
Wide resistance range for advanced diagnostics and high-value insulation systems.
8 mA Noise Rejection
Designed to work reliably in electrically noisy environments.
CAT IV Safety
High safety rating suitable for utility-grade field applications.
Why the Megger S1-568 Stands Out
The Megger S1-568 belongs to the S1-Series of advanced DC insulation resistance testers. It is aimed primarily at power utilities and service companies involved in generation, transmission, and distribution. The instrument combines practical usability with high-end measurement performance, making it suitable for serious insulation diagnostics in both maintenance and commissioning workflows.
One of the strongest advantages of the S1-568 is its combination of high charge current, software filtering, and strong noise rejection. In the field, these features help deliver stable readings even when testing in electrically harsh environments. The tester also includes a rapid-charge Li-ion battery, and it can continue operating from an AC source when the battery is flat, which is a practical benefit for long workdays.
Key Features at a Glance
Multiple Test Modes
IR, IR(t), DAR, PI, SV, DD, and ramp test for advanced insulation analysis.
Large Backlit Display
Clear visibility in low-light and outdoor testing conditions.
Dual Rotary Switch Interface
Simple and fast operation for field engineers.
USB and Bluetooth
Convenient data handling and connectivity options.
Quick-Start Guide
Stored in the lid for quick reference in the field.
Optional Transport Case
Extra protection and easier transport for mobile crews.
Technical Specifications
| Specification | Megger S1-568 | Notes |
|---|---|---|
| Model Type | 5 kV insulation resistance tester | Part of the S1-Series |
| Resistance Range | Up to 35 TΩ | High-range insulation diagnostics |
| Test Modes | IR, IR(t), DAR, PI, SV, DD, ramp test | Diagnostic-oriented testing |
| Noise Rejection | 8 mA | With 4 software filters |
| Capacitance Range | 10 nF to 25 μF | For S1-568, test voltage above 500 V |
| Current Range | 0.01 nA to 6 mA | Wide measurement coverage |
| Voltmeter Range | 30 V to 660 V AC or DC | 45–65 Hz |
| Timer Range | Up to 99 min 59 s | Minimum setting 15 s |
| Logging Memory | 11 hours at 5-second intervals | Useful for long-term testing |
| Safety Standard | IEC 61010-1 | Professional electrical safety compliance |
| EMC Standard | IEC 61326-1 | Electromagnetic compatibility |
| IP Rating | IP65 closed, IP40 open | Rugged field-ready design |
| Operating Temperature | -20 °C to 50 °C | Suitable for harsh environments |
| Weight | 4.5 kg | S1-568 / S1-1068 family |
| Connectivity | USB Type B, Bluetooth Class 2 | Remote control via USB cable only |
Best Use Cases
- Generation, transmission, and distribution system testing
- Power utility maintenance and commissioning
- Service company insulation diagnostics
- High-voltage equipment condition assessment
- Long-duration insulation trend analysis
For Utilities
Ideal for testing critical infrastructure where reliability and safety matter most.
For Service Teams
Useful for mobile crews that need fast setup, durable build quality, and easy operation.
For Maintenance
Excellent for routine testing, preventive maintenance, and fault investigation.
Final Verdict
The Megger S1-568 Insulation Resistance Tester is a strong choice for professionals who need accurate, stable, and field-ready insulation testing. With its 5 kV capability, up to 35 TΩ range, advanced filtering, diagnostic modes, and rugged safety-focused design, it is well suited for demanding utility and industrial environments.
Need Price & Stock Availability?
Contact our sales team for current availability, quotation, and delivery details for the Megger S1-568.
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June 28, 2026
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