Expert 5 kV, 10 kV and 15 kV insulation resistance testers

Reliable results in noisy substations

Adaptive filtering and 8 mA noise immunity ensure stable readings in substations up to 1000 kV. The filter reacts instantly to suppress spikes.

Accurate testing with RE>Act™

RE>Act™ shows when insulation is ready to retest, avoiding errors from residual reabsorption current. Save time between tests, and safely monitor discharge to avoid dangerous return voltages 

Remote control for safer, easier testing

Test remotely via USB — ideal for arc-flash zones. Stay clear of danger and finish work faster.

PI Predictor™ cuts test time in half

PI Predictor™ estimates PI values in minutes, improving productivity with no loss in accuracy. Ideal for multiple asset tests. 

Full diagnostic suite with PDC capability

Run IR, DAR, PI, DD, SV, ramp and PDC tests. Export results easily to PowerDB or CertSuite. 

About the product

The range includes three models: S1-568/2 (5 kV), S1-1068/2 (10 kV), and S1-1568/2 (15 kV). All are trusted by utility engineers, OEMs, and commissioning teams working on critical assets like transformers, cables, switchgear, and bushings.

The adaptive filter, nearly unique to Megger, monitors the rate of change in noise current and applies dynamic damping to prevent test current distortion. It predicts spikes that would otherwise affect results and stabilises readings — even during energisation events or switching noise.

Test modes include IR, DAR, PI, DD, SV, ramp, and PDC (with software). PI Predictor™ reduces Polarisation Index test time by up to 50%, and RE>Act™ shows when insulation is safe to retest, saving time and reducing risk. 

Fully remote control via Bluetooth® or USB enables testing from a safe distance — or even from the comfort of an air-conditioned vehicle during extreme site conditions. Onboard memory and no-dongle Bluetooth® make data transfer seamless. High-performance guard terminals ensure measurement accuracy even with high surface leakage. 

With CAT IV safety ratings, robust design, and powerful time-saving tools, the Megger Expert range gives HV professionals the speed, safety, and confidence they need to test without compromise. 

Product documents

Data sheet

EXPERT_S1-568-2--S1-1068-2--S1-1568-2_DS_en_US.pdf

User guide

S1-568-2--S1-1068-2--S1-1568-2_UG_en.pdf

Application note

ReAct_AN_en.pdf

Application note

PDC_AN_en.pdf

Application note

PI-Predictor-AN-EN.pdf

Application note

S1 application_AN_en.pdf