Digital Insulation Tester ( HTC – DIT-90 )

Description

The HTC DIT‑90 Digital Insulation Tester is a rugged, precision instrument designed to measure insulation resistance across electrical systems, cables, motors, transformers, and control equipment. Engineered for maintenance professionals, electricians, and safety inspectors, the DIT‑90 series delivers high-accuracy testing in a compact, push-button handheld form factor that is both portable and reliable.

At the core of this tester is a 3½-digit LCD display (up to 1999 counts), featuring large 20 mm tall digits for clear readability even in harsh lighting conditions. The display updates at approximately 2.5 readings per second, and includes “OL” over-range indicators and low‑battery warnings to help ensure safe and dependable use.

Available in several voltage-rating models, the DIT‑90 supports key test voltages: the DIT‑90B offers 1000 V DC with a 0–200 MΩ range (0.1 MΩ resolution), while DIT‑90D provides 500 V DC in the same resistance range with identical resolution for optimized safety and precision in mid-voltage circuits.

All models feature a short-circuit current of less than 2 mA to prevent tripping sensitive protective relays, with insulation accuracy rated at ±(3% of reading + 2 digits) under standard conditions.

Safety is a core consideration. The DIT‑90 meets IEC 1010 Category II (1000 V) requirements, offering dielectric strength of 3.5 kV between input terminals and the case, and insulation resistance exceeding 50 MΩ at 500 V between live circuitry and the enclosure. Safety is a core consideration. The DIT‑90 meets IEC 1010 Category II (1000 V) requirements, offering dielectric strength of 3.5 kV between input terminals and the case, and insulation resistance exceeding 50 MΩ at 500 V between live circuitry and the enclosure

The insulation tester supports broad applications including:

• Evaluation of motor winding insulation,

• Diagnostics of transformer and generator insulation,

• Testing cables and splices,

• Preventive maintenance on switchgear and control panels,

• Verifying insulation integrity in industrial systems, and

• Compliance checks in high-voltage distribution lines.

Functionally, the DIT‑90 also ensures device reliability in humid or warm environments, operating between 0 °C and +50 °C at 0–75% RH, and safely storing from –20 °C to +60 °C in up to 80% RH (battery removed)

Key Specifications and Features:

• Display: 3½-digit LCD (1999 max count); 20 mm digits; over-range and low-battery indicators

• Test Voltage Models: 1000 V (200 MΩ range, 0.1 MΩ resolution) or 500 V versions, depending on model

• Resistance Range: up to 200 MΩ; resolution down to 0.1 MΩ; accuracy ±(3% + 2 digits)

• Short Circuit Current: < 2 mA to avoid tripping protective devices

• Safety: IEC 1010 CAT II, 1000 V; dielectric strength 3.5 kV; insulation resistance >50 MΩ at 500 V

• Sampling Rate: ~2.5 readings/second; over-range indicated by “1” or “–1”

• Power: 6 AA batteries (1.5 V) or optional 9 V DC adaptor

• Physical Dimensions: approx. 139 × 99 × 54 mm; weight ~395 g with battery

• Environmental: Operating 0–50 °C / storage –20–60 °C; RH limits as specified

• Standard Accessories: Test leads, soft case, battery, manual

Benefits for Professionals:

• Accurate and safe insulation resistance testing across a broad voltage/resistance spectrum

• Engineered for use in environments where protection circuits are sensitive to high test currents

• Portable and durable design for frequent use in industrial and commercial settings

• Clear LCD display and simple one-button operation ideal for rapid deployment

• Optional external power enables prolonged use during diagnostics or QA testing rounds

• Built-in safety and rating systems reduce user error and equipment risk

In conclusion, the HTC DIT‑90 Insulation Tester is a practical, high-performance solution for measuring insulation resistance reliably and safely. With selectable voltage options, precision accuracy, and compact portability, it’s an excellent tool for contractors, maintenance technicians, and safety inspectors. This tester supports routine diagnostics, preventive maintenance, and compliance checks for an array of electrical assets—from motors and switchgear to cables and distribution panels—while balancing ease-of-use with technical performance.