HT9920 Insulation Resistance Tester
Accurate Electrical Safety Testing
Engineered for extreme climates, heavy dust, and high-noise industrial environments. The HT9920 delivers fast, precision insulation measurements (10–1000V) with intelligent contact check & rapid discharge — protecting your assets and personnel across India’s growing infrastructure.
The Critical Need for Accurate Insulation Testing
India’s rapid industrial growth demands zero downtime & absolute safety. Hidden insulation failures cause fires, arc flashes, and catastrophic equipment loss.
Prevent Catastrophic Failures
Early detection of degraded insulation avoids short circuits, electrical fires and unplanned shutdowns. Routine testing with precision instruments reduces risks significantly.
Harsh Indian Conditions
Monsoons, extreme heat, dust – environmental stressors speed up insulation breakdown. HT9920 is sealed, moisture-proof, and built to deliver stable, accurate readings regardless of conditions.
HT9920: Precision, Speed & Intelligence
Switching-power-supply design, 1V step voltage, and smart anomaly detection — next-gen insulation testing for professionals.
Wide & Flexible Range
10V–1000V DC output, step 1V, max current 1.8mA. Test LV wiring to HV motors & transformers with single device.
High Precision & Stability
Basic accuracy ±2% rdg. ±5 dgt. Advanced filtering rejects EMI, ensures repeatable results in electrically noisy plants.
Enhanced Safety & Discharge
Non-contact constant current discharge (12mA) auto-discharges capacitive loads. Visual/acoustic warnings, double-click trigger.
Rugged & Portable
Shock-resistant sealed case, dustproof keys, low-drift components. Weighs only 2kg — ideal for field technicians.
Smart Contact & Short Detection
Detects broken test leads, poor contact, short-circuit before high voltage — eliminates false PASS and arc flash risk.
Rich Interfaces & Automation
External I/O, RS232, LAN, Analog output (0–4V). Perfect for production lines, system integration, and data logging.
Technical Specifications
Engineered for industrial resilience — HT9920 sets a new benchmark.
0 ~ 9990 MΩ (5 ranges)
DC 10V ~ 1000V (1V step) / 1.8mA max
±2% rdg. ±5 dgt.
50mS (Fast) / 500mS (Slow)
12mA constant current discharge
3.5″ TFT-LCD
RS232, LAN, External I/O, Analog out
325x215x96.5mm / 2kg
Full specifications & accessories: HT9921 test clip, PB36 connector & communication cable included. Visit official product page →
Next-Gen vs. Traditional Testers
Faster discharge, contact anomaly check, and constant‑current technology — HT9920 outclasses conventional insulation testers.
| Feature | HT9920 Innovation | Traditional Tester |
|---|---|---|
| Discharge Method | 12mA constant current, fast & relay‑less → no contact burn | Constant resistance discharge, timed, residual voltage risk |
| Contact / Lead Detection | Automatic “ContHi” / “ContLo” warning, prevents open circuit misjudgment | No anomaly detection → false PASS of defective units |
| Short-circuit Pre-check | Low‑voltage short detection before high voltage to avoid breakdown | Blind high‑voltage application may burn defect points |
| Test Speed | Min cycle 50mS — industry fastest | Typically >500mS |
✨ Soft-pack battery testing simplified — one HT9920 replaces two insulation testers, reduces hardware cost and test steps. Ideal for EV battery, lithium pouch, and component manufacturing.
Trusted Across Sectors
From power utilities to commercial complexes — tailor-made for Indian industries.
Heavy Manufacturing
Regular health checks of induction motors, generators, and high-voltage switchgear. Predict failure, extend asset life.
Power Distribution
Test transformers, HT cables, and switchgear to prevent unplanned outages and ensure stable electricity supply.
Commercial Buildings
Hospitals, malls, offices: routine safety audits using HT9920 ensure compliance with Indian electrical standards.
EV & Battery Production
Insulation test for lithium-ion cells, soft-pack batteries, and high‑voltage connectors. Contact check avoids misjudgment.
Elevate Your Electrical Safety Standards
Equip your technicians with the HT9920 — the most accurate, rugged, and intelligent insulation resistance tester available in India. Reduce downtime, prevent arc flash, and ensure regulatory compliance.
