Precision in Every Ampere: TUNKIA’s High-Current Measurement Solutions

Where Current Measurement Matters

From national power grids and industrial testing lines to EV charging facilities and precision laboratories, current measurement lies at the heart of modern electrical systems. Every process that converts, distributes, or monitors electrical energy relies on accurate current testing to ensure efficiency, reliability, and safety.

In power generation and transmission, current measurement ensures stability and loss control. In electric vehicle charging and renewable energy integration, it supports accurate metering and system protection. In research and calibration laboratories, it provides the traceability that links industrial instruments to national and international standards.

As global industries move toward electrification, clean energy, and intelligent manufacturing, the demand for precise and traceable current measurement continues to grow.

The Importance of High-Accuracy Current Measurement

For high-current applications, even a small measurement deviation can lead to significant energy losses, misjudged efficiency, or equipment malfunction. Precise current measurement ensures:

• Energy reliability and safety, preventing overloads or instability

• Accurate power and efficiency analysis in energy and industrial systems

• Reliable product testing and calibration for meters, converters, and transformers

• Support the precision testing needs of metrology institutes, quality inspection agencies, and high-end manufacturing enterprises.

Electrical metrology—the science of measuring electrical quantities—forms the foundation of all these activities. It ensures that every ampere measured or delivered is accurate, stable, and traceable to a recognized standard.

Technical Challenges in High-Current Testing

High-current measurement is far more than scaling up ordinary current testing. It involves multiple physical and technical challenges that demand precision engineering:

• Thermal Effects

The higher the current, the greater the I⊃2;R losses. Heating changes resistance values and leads to drift and instability, especially during long-duration testing.

• Parasitic Effects

Parasitic inductance, capacitance, and resistance can distort waveforms, especially in AC and high-frequency measurements, leading to phase and amplitude errors.

• Magnetic Coupling and Interference

Strong magnetic fields generated by large currents can interfere with nearby circuits and sensors, requiring careful shielding and compensation.

• Safety and Insulation

High-current testing environments require strict insulation, robust mechanical design, and safe current handling to protect both operators and equipment.

• Traceability and Calibration

Achieving traceability at the ppm (parts per million) level requires stable reference standards and reliable calibration sources—a key challenge for national and industrial laboratories alike.

Overcoming these obstacles calls for advanced metrology solutions with ultra-stable current sources, precision sensors, and accurate reference meters—areas where TUNKIA has built its expertise.

TUNKIA’s High-Current Measurement Solutions

TUNKIA offers a comprehensive range of high-accuracy current standards, meters, and sources, designed to meet the demanding needs of power, energy, and metrology laboratories worldwide.

1. Ratio Standards: Establishing the Reference

TH0500 Precision Current Transducer

Covering a wide range from 0.1 A to 20 kA, with accuracy from 2 ppm to 50 ppm, this transducer provides exceptional linearity and stability.

Ideal for laboratories requiring high-current scaling, calibration of current transformers, or verification of power analyzers.

TH0600 Precision Current Transformer

Designed for 0.1 A to 10 kA applications, achieving 5 ppm to 30 ppm accuracy.

Its excellent phase and amplitude characteristics make it suitable for both AC and DC reference setups.

2. Standard Meters: Measuring with Confidence

TH0530 / TH0630 Through-Core Ammeter

Offering up to 0.005 class accuracy across DC to 1 kHz and up to 2 kA, this series provides precise, stable measurement in laboratory and production test systems.

With through-core design and digital indication, it ensures reliable, non-intrusive measurement even at high currents.

3. Standard Sources: Generating Precision

TH1000 Ultra-Stable Precision Current Source

A high-accuracy DC current source with uncertainty as low as ±15 μA/A, and output range of ±(0–110 mA).

Ideal for calibration of precision ammeters and current shunts.

TA1300 AC Current Standard Source

Provides AC currents up to 6 kA, with selectable frequencies of 65 Hz, 400 Hz, and 1 kHz, and accuracy of 0.02 or 0.05 class.

Designed for power instrument verification and large-scale calibration systems.

A1500 AC/DC Standard Current Source

Capable of DC to 1 kHz, up to 6 kA, with 0.02 or 0.05 class accuracy.

A versatile source for both direct and alternating current calibration applications.

TI1100 Precision AC/DC Current Calibrator

Covering DC and AC 10 Hz–10 kHz, with best accuracy of DC 0.01 class, AC 0.02 class.

Ideal for verifying meters, transducers, and sensors in both low and medium current ranges.

Together, these instruments form a complete high-current metrology ecosystem—from generation to measurement, from reference to application—ensuring traceability, precision, and long-term stability.

Building Trust Through Precision

High-current testing is a core area where metrology technology and engineering practice intersect. Tunkia, through continuous innovation in precision measurement, current comparison, and standard source technology, provides users with highly stable and accurate systematic solutions, contributing to global measurement standardization and high-quality industrial development.