Portable insulation resistance meter S1 series

Overview
The Expert S1 series delivers precise insulation testing in high-noise substation and field environments. Key capabilities include adaptive filtering, 8 mA noise immunity, PI Predictor™ and RE>Act™ test mode, plus full remote control for safer operation. The range is engineered for utility engineers, OEMs and commissioning teams testing transformers, cables, switchgear and bushings.

Models

• S1-568/2 — 5 kV
• S1-1068/2 — 10 kV
• S1-1568/2 — 15 kV

Key features

• Adaptive filtering that monitors noise-current change rate and applies dynamic damping to prevent test-current distortion, predict/suppress spikes and stabilise readings during energisation or switching.
• 8 mA noise immunity for stable readings in noisy substations.
• RE>Act™: indicates residual reabsorption current and shows when insulation is ready to retest, reducing errors and downtime between tests.
• PI Predictor™: rapid estimation of Polarisation Index values, cutting PI test time by up to 50% for faster workflows.
• Full remote control via Bluetooth® (no dongle) or USB for safe distance operation (suitable for arc‑flash zones and vehicle-based testing); onboard memory for temporary result storage.
• High-performance guard terminals to minimise surface leakage effects and ensure measurement accuracy.
• Comprehensive diagnostic suite: IR, DAR, PI, DD, SV, ramp and PDC (PDC supported via software).
• Export results to PowerDB or CertSuite for reporting and long-term analysis.
• CAT IV safety rating and robust field-rated mechanical design.

Applications
Designed for high-voltage professionals performing diagnostics and acceptance tests on transformers, cables, switchgear, bushings and other critical assets in noisy substation environments. Suitable for utilities, OEMs and commissioning teams that require high noise immunity, remote operation and advanced diagnostics.

Software & connectivity

• Bluetooth® and USB remote control and data transfer (Bluetooth without dongle).
• Onboard memory for storing results prior to export.
• Windows communications driver available for instrument-to-PC transfer (driver and software updates accessible via product support).

Full diagnostic / test modes

• Insulation Resistance (IR)
• Dielectric Absorption Ratio (DAR)
• Polarisation Index (PI)
• Dielectric Discharge (DD)
• Step Voltage (SV)
• Ramp tests
• Partial Discharge Correlation (PDC) — with supporting software

Advantages

• Reliable results in noisy substations thanks to adaptive filtering and high noise immunity.
• Time savings via PI Predictor™ and RE>Act™ functionality.
• Safer test workflows enabled by remote operation.
• Comprehensive diagnostics and easy export for streamlined reporting and asset management.

Technical specifications

• Series / model prefix: S1 (S1-568/2, S1-1068/2, S1-1568/2)
• Test voltages: 5 kV, 10 kV, 15 kV (per model)
• Noise immunity: 8 mA
• Adaptive filter: dynamic damping and spike prediction
• PI Predictor™: reduces PI test time by up to 50%
• RE>Act™: reabsorption current indicator for safe retest timing
• Remote control: Bluetooth® (no dongle) and USB
• Onboard memory: instrument internal storage
• Guard terminals: high-performance for accurate measurements with surface leakage
• Safety rating: CAT IV
• Test modes: IR, DAR, PI, DD, SV, ramp, PDC (PDC via software)
• Data export: compatible with PowerDB and CertSuite
• Target users: utility engineers, OEMs, commissioning teams