WHALETEQ CMRR 3.0+

This advanced test equipment is specifically designed to verify the Common Mode Rejection Ratio (CMRR) of ECG and EEG products, meeting the stringent test circuit requirements defined by international medical standards. It enables hardware engineers to efficiently and accurately measure CMRR values in their devices.

With its robust insulation and grounding design, this tester is ideal for use in:

• Research and Development (R&D)
• Compliance Testing
• Production Line Testing

Standards Compliance:

The tester supports compliance with the following international medical standards:

• IEC 60601-2-25
• IEC 60601-2-27
• IEC 60601-2-47
• IEC 60601-2-26
• GB 9706.225 / GB 9706.227 / GB 9706.226
• YY 9706.247 / YY1079 / YY1139 / YY0782 / YY0885
• ANSI / AAMI EC11
• ANSI / AAMI EC13

Key Applications:

• Verifying CMRR in ECG and EEG devices
• Ensuring compliance with international medical standards
• Quality control in production lines
• Development and validation of medical devices

Benefits:

• Provides accurate and reliable measurements of CMRR
• Advanced insulation and grounding design for safe operation in testing environments
• Optimized for engineers working in R&D, compliance testing, and quality assurance for medical devices.

CMRR 3.0+ – Advanced Solution for CMRR Testing in ECG Devices

Common Mode Rejection Ratio (CMRR) is a critical measure of a medical device’s ability to withstand electrical noise. Common mode interference arises from external power sources, circuits, or nearby equipment. Since medical devices are often used in high-noise environments, particularly those with significant electromagnetic interference (EMI), maintaining device accuracy and reliability is vital.

International medical standards mandate CMRR testing to ensure that ECG devices produce accurate readings even under noisy conditions. Manufacturers strive to maximize CMRR values to deliver clearer, more readable ECG signals.

The Challenge of CMRR Testing

Creating a dedicated CMRR tester that adheres to specific circuit and hardware design requirements from medical standards is a complex task. The test circuit must simulate various conditions, including:

• Capacitance effect (100pF) between the patient bed and the floor
• A voltage supply of 20Vrms
• A parallel circuit (51kΩ/47nF) to replicate the impedance between electrodes and skin

These intricate design requirements make development, calibration, and maintenance of CMRR testers challenging for manufacturers.

The CMRR 3.0+ Solution

After thoroughly analyzing the standards and improving on earlier designs, we developed the CMRR 3.0+. It overcomes traditional challenges with the following innovations:

1. Double-Layer Shielding Design
   • Ensures regulatory compliance while effectively controlling internal noise for consistent and accurate testing results.
2. Built-in Sine Wave Signal Generator
   • Eliminates the need for external signal generators, which can introduce additional noise.
   • Includes a voltage measurement circuit for simplified and reliable test setups.
3. Extended CMRR Test Range
   • Provides higher output voltage of up to 70.71Vrms.
   • Extends the test range to 120dB, exceeding the 89dB requirement specified by medical standards.
   • Enables engineers to improve product specifications and performance.
4. Robust Noise Isolation
   • Designed for both R&D and production line testing with reliable noise isolation for uninterrupted operation.
5. Automated Testing with SDK
   • Includes a free Software Development Kit (SDK) to enable efficient, automated testing in production environments.
6. Standard Assistant Software
   • Simplifies compliance testing setups.
   • Users can follow step-by-step instructions, select test parameters, and easily complete standard testing processes.

Benefits of the CMRR 3.0+

• High-Precision CMRR Testing: Ensures reliable results under real-world simulated conditions.
• Extended Testing Range: Supports tests up to 120dB, allowing for superior device performance.
• Noise-Free Setup: Built-in signal generator eliminates external noise sources.
• Easy to Operate: Simplified setup for compliance testing using intuitive software.
• Automated Efficiency: SDK enables streamlined testing for production lines.

Conclusion

The CMRR 3.0+ sets a new benchmark for CMRR testing, helping ECG device manufacturers achieve superior noise resistance, clearer signals, and compliance with international standards. By offering reliable, high-quality performance and advanced features, the CMRR 3.0+ empowers manufacturers to build exceptional ECG devices that excel in accuracy, reliability, and overall performance.