A Configurable Calibration System for Electrical Safety Testers

Calibration of electrical safety testers—such as hipot testers, insulation resistance testers, RCD testers, and multifunction installation testers—is a fundamental task in electrical calibration laboratories.

Traditionally, this has been carried out using all-in-one multifunction calibrators, which integrate multiple capabilities—such as high resistance simulation, leakage current generation, high voltage measurement, and RCD testing—into a single unit. This approach provides a convenient and standardized solution for a wide range of calibration tasks.

As application scenarios continue to expand and testing requirements become more demanding, laboratories are placing increasing emphasis on flexibility, scalability, and system adaptability. In particular, applications involving higher voltage levels, customized test setups, or evolving calibration needs are driving interest in more versatile approaches.

In this context, configurable calibration systems based on multiple dedicated instruments are gaining attention. Instead of relying on a single integrated device, this approach allows laboratories to combine specialized instruments, each optimized for a specific function.

A typical configuration includes:

• TD1220 – for DC high voltage and high resistance calibration

• TD1230 – for AC/DC hipot tester calibration    

• TD1240 – resistive load box for power and current limit testing

By combining these instruments, laboratories can build a comprehensive calibration solution that covers the primary functions required for electrical safety tester calibration.

Key Capabilities of the System

TD1220 Verification Device for DC High Voltage & High Value Resistor

• DC high voltage output：0 to 10 kV

• DC small current output：0 to 50 mA

• DC resistance measurement：100 Ω to 2 TΩ (10 TΩ option)

• Accuracy: Class 0.03

• Constant current source (CC) and constant voltage source (CV) modes

• CV mode: suitable for high resistance measurements

• CC mode: suitable for low resistance measurements

Designed for:

• Insulation resistance testers

• High-voltage DC sources

• Electrical safety analyzers

It provides precise calibration for high-resistance ranges and supports applications requiring stable high-value resistance simulation.

TD1230 Verification Device for Withstanding Voltage Tester

• AC/DC voltage measurement: 100 V to 15 kV

• AC/DC current measurement: 0.1 mA to 250 mA

Designed for:

• AC/DC withstanding voltage tester

• Withstanding voltage part of safety performance comprehensive tester

• Withstanding voltage part of insulation withstanding voltage tester

This enables accurate calibration of most high-voltage safety testers used in production and inspection environments.

TD1240 Verification Load Bank for Withstanding Voltage Testers

• Resistance range: 12.5 kΩ to 2.25 MΩ

• Maximum working voltage: 2.5 kV to 15 kV

• Maximum current: up to 200 mA

• Maximum power: up to 500 VA

It can be used with TD1230, supporting verification of output power and current limiting performance in high-voltage testing applications. 

Advantages of a Configurable System

Compared with traditional all-in-one instruments, a configurable multi-instrument approach offers several practical benefits:

1. Greater Flexibility
Each instrument can be selected and applied according to specific calibration tasks, enabling more targeted configurations.

2. Scalable System Design
Laboratories can expand their setup step by step as requirements evolve.

3. Extended Performance Range
For example, voltage measurement capability can reach up to 15 kV, supporting more demanding test scenarios.

4. Improved Maintainability
Individual instruments operate independently, reducing the impact of downtime and simplifying maintenance.

All-in-one multifunction calibrators have long provided a reliable and standardized solution for electrical safety tester calibration.

At the same time, evolving application requirements are encouraging the adoption of more flexible approaches. A configurable system built on dedicated instruments—such as TD1220, TD1230, and TD1240—offers an effective way to address these needs, particularly in scenarios that require adaptability, higher performance ranges, or system scalability.