Tekbox TBLM1 LISN Mate Rental for Common-Mode and Differential-Mode Noise Analysis in Monterrey

In electromagnetic compatibility (EMC) testing, identifying the origin of conducted emissions is a fundamental task for achieving standards-compliant designs. One of the most common difficulties is that the noise measured at a LISN (Line Impedance Stabilization Network) is the sum of common-mode and differential-mode components, which complicates diagnosing the true source of the problem.

The LISN Mate (separation network) is a device designed specifically to overcome this limitation, allowing both components of the conducted noise to be separated and analyzed independently.

Noise separation: key to EMC diagnostics

In electronic systems, noise can propagate in two main ways:

• Differential mode: noise that flows between conductors (positive and negative line)
• Common mode: noise that couples to ground or external structures

Distinguishing between these two modes is critical because each has different generation mechanisms and mitigation solutions. Without this separation, the analysis can lead to inefficient or incorrect solutions.

How the LISN Mate works

The LISN Mate, such as the TBLM1 model, is used together with two LISNs installed on the supply lines:

• One LISN on the positive line
• One LISN on the negative line

The device connects to the outputs of both LISNs and internally decomposes the total noise into its components:

• Dedicated output for common mode
• Dedicated output for differential mode

Each component is presented on a separate BNC connector, allowing direct analysis with instruments such as spectrum analyzers or EMI receivers.

Benefits in conducted emissions testing

Using a separation network brings significant advantages during the diagnostic process:

• Clear identification of the dominant noise type
• Less time spent debugging EMC failures
• Proper selection of solutions (filters, ferrites, layout redesign)
• Greater efficiency in the regulatory compliance process

This is especially useful during development, pre-certification, or field troubleshooting.

Integration into EMC test benches

The LISN Mate integrates easily into standard conducted emissions measurement setups. Using it does not alter the base measurement process but adds extra visibility into the system’s behavior.

It is compatible with:

• Standard LISNs on supply lines
• Spectrum analyzers
• EMI receivers
• RF acquisition systems

This makes it a versatile tool for laboratories and engineering environments.

Technical specifications – LISN Mate (TBLM1)

Typical applications

The LISN Mate is especially useful where detailed analysis of conducted emissions is required:

• Power supply development
• Automotive electronics
• Industrial equipment
• Consumer electronic devices
• EMC test laboratories

Its separation capability gives a better understanding of the noise source so more effective solutions can be applied.

Benefits of renting

Renting the LISN Mate adds advanced EMC analysis capabilities without buying specialized equipment, which is ideal for development, diagnostic, or pre-certification projects.

Its main advantages include:

• Accurate identification of noise sources
• Optimized engineering time
• Higher success rate in EMC tests
• Simple integration into existing benches
• Lower costs during development stages

This approach allows deeper analysis of conducted emissions, supporting regulatory compliance and the design of products that are more robust from an electromagnetic standpoint.