Radian RX‑30, RX‑31 and RX‑33: The Accuracy Benchmark for Modern Energy Metrology

Thu 16.07.2026

The Radian RX series delivers a state-of-the-art solution for precise measurement of power and electrical energy in both single-phase and three-phase applications. Models RX‑30, RX‑31, and RX‑33 combine exceptional accuracy, long-term stability, and rugged design, making them the ideal choice for calibration laboratories, meter manufacturers, and the most demanding metrology environments.

Radian RX‑30, RX‑31 and RX‑33: The Accuracy Benchmark

for Modern Energy Metrology 

Radian RX‑30, RX‑31 and RX‑33 represent the top tier of three-phase reference instruments for power and energy measurement. They provide an ideal solution for the most accurate meter testing, calibration, and metrology laboratories. 

RX‑30 - Reliable Mid-Range Reference Standard

• Energy and power accuracy: ±0.04% (400 ppm) at PF = 0.5
• Voltage accuracy: ±0.02% (200 ppm)
• Current accuracy (AC): ±0.028% (280 ppm)
• Stability: drift 8 ppm√month
• Temperature coefficient (energy): 5 ppm/°CBenefits:

The RX‑30 is a cost-effective choice for routine calibration and power measurement. Its wide operating range (voltage, current, frequency) ensures smooth performance in both laboratory and field environments.

RX‑31 - Higher Accuracy for Demanding Applications

• Energy and power accuracy: ±0.02% (200 ppm) at PF = 0.5
• Voltage accuracy: ±0.01% (100 ppm)
• Current accuracy (AC): ±0.014% (140 ppm)
• Stability: drift 4 ppm√month
• Temperature coefficient (energy): 5 ppm/°CBenefits:

The RX‑31 significantly reduces measurement uncertainty. It is ideal for metrology applications, meter manufacturers, and labs requiring higher precision.

RX‑33 - Ultimate Precision for Top-Level Laboratories

• Energy and power accuracy: ±0.01% (100 ppm) at PF = 0.5
• Voltage accuracy: ±0.005% (50 ppm)
• Current accuracy (AC): ±0.007% (70 ppm)
• Accuracy at PF = 1: ±0.005% (50 ppm)
• Stability: drift 4 ppm√month
• Temperature coefficient (energy): 5 ppm/°CBenefits:

The RX‑33 is the premium choice for national metrology institutes, R&D centers, and applications requiring extreme accuracy and full NIST traceability.

Key Features of the RX Series

• Single-phase and three-phase operation for maximum flexibility
• Measurement of voltage, current, power, phase angle, harmonics, and power factor
• Seamless integration with WECO test systems
• Rugged design with IEC 61010 CAT IV / 600 V compliance
• High sampling rate up to 1,000,000 samples per second
• Multilingual interface and advanced vector/VAR calculations
• CE/UL compliance and ISO/IEC 17025 support

Typical Applications

Calibration laboratories & meter development

High accuracy, stability, and traceability are essential

Meter manufacturers
RX‑30 for cost-effective calibration, RX‑31/33 for stricter requirements

Utilities & service centers
Reliable power measurement even in field or industrial environments

National metrology institutes
RX‑33 as a primary reference standard

Why Choose the Radian RX Series? 

• Accuracy levels tailored to your needs
• Reliable operation beyond controlled lab environments
• Easy integration into existing systems
• Long-term stability with minimal drift
• Trusted metrology performance with NIST traceability

Radian RX‑30, RX‑31 and RX‑33 combine innovative Xytronic technology with a strong focus on precision and safety. They are the ideal partner for anyone who needs highly reliable and accurate power and energy measurement-from R&D laboratories to real-world field testing.

More information here: Three-Phase RX Reference Standards - Radian Research