HRRS‑5 kV: When standard resistance decades are no longer enough

Thu 16.07.2026

High resistance measurements at high voltage quickly expose the limits of conventional solutions. The HRRS‑5 kV from IET Labs is a precision resistance decade designed exactly for these conditions—where absolute control of resistance values must be maintained even under kilovolt stress.

HRRS‑5 kV: When standard resistance decades are no longer enough

High resistance measurements at high voltage quickly expose the limits of conventional solutions. The HRRS‑5 kV from IET Labs is a precision resistance decade designed exactly for these conditions-where absolute control of resistance values must be maintained even under kilovolt stress.It provides accurate, stable resistance settings from low ohmic values up to an impressive 10 TΩ, with a maximum operating voltage of 5 kV DC (optionally up to 10 kV). This makes it an essential tool for calibration, R&D, and insulation testing applications.

Wide range without compromise

At the core of the HRRS‑5 kV is a flexible, modular design with 1 to 9 decades, configurable to match specific application requirements. The system covers:

• low resistance ranges starting from ohms
• mid-range values in the megohm region
• ultra-high resistances in the GΩ to TΩ range

This wide span allows a single instrument to replace multiple devices, simplifying workflows while maintaining high accuracy across the entire range.

Accuracy that meets metrology demands

The HRRS‑5 kV is available in two accuracy classes:

• Q class: up to ±0.01%
• B class: up to ±0.03%

Long-term stability is typically around 10 ppm/year, minimizing drift and reducing recalibration intervals. A low temperature coefficient from 5 ppm/°C and voltage coefficient from 0.2 ppm/V ensure that resistance values remain consistent even under varying environmental and electrical conditions.

Engineered for high-voltage operation

Measuring high resistances at kilovolt levels requires exceptional control of leakage currents and insulation integrity. The HRRS‑5 kV is specifically engineered to address these challenges:

• switching system rated up to 10 kV
• low-leakage terminals using high-grade insulating materials
• internal design optimized to suppress surface and volume leakage paths

For the highest resistance ranges (≥ 100 GΩ), a sealed (-WT) version with integrated desiccant is available, protecting the system from humidity-one of the primary sources of measurement error in teraohm applications.

Designed for real-world testing conditions

The HRRS‑5 kV reflects real measurement scenarios and calibration practices:

• low resistance ranges calibrated at low voltage
• mid ranges tested up to approximately 200 V DC
• high resistance ranges (100 MΩ to TΩ) typically tested at 1000 V, with optional extension up to 5 kV or 10 kV

This ensures realistic simulation of actual operating conditions for the devices under test.

Typical applications

The HRRS‑5 kV is ideally suited for:

• calibration of megohmmeters and insulation testers
• insulation resistance testing of materials and components
• development and verification of high-input-impedance measurement systems
• electrochemical and specialized laboratory measurements

Key specifications

• resistance range: up to 10 TΩ
• number of decades: 1 to 9
• maximum voltage: 5 kV DC (optional 10 kV)
• accuracy: ±0.01% (Q) / ±0.03% (B)
• temperature coefficient: from 5 ppm/°C
• voltage coefficient: from 0.2 ppm/V
• long-term stability: approx. 10 ppm/year
• calibration voltage: standard up to 1 kV, optional up to 5 kV / 10 kV
• construction: standard or sealed (-WT) for high-resistance applications
• terminals: low-leakage design with high-insulation materials

Precision under control

The HRRS‑5 kV is more than just a resistance decade-it is a solution for applications where conventional instruments reach their limits. By combining extreme resistance range, high-voltage capability, and metrology-grade accuracy, it delivers reliable performance in the most demanding environments.For applications where every detail matters and measurement confidence is critical, the HRRS‑5 kV provides a solid and dependable foundation.

HRRS‑5 kV - precision where high resistance truly begins.

More inforamation here:  5 kV & 10 kV High Resistance Decade Box -IET Labs, Inc.