Schwarzbeck CDT 3200 Coupling / Decoupling Transformer

Schwarzbeck CDT 3200 is a high-performance coupling and decoupling transformer designed for EMC testing applications in accordance with international standards such as MIL STD 461, DO 160, ISO 11452-10, and related specifications. It is engineered to inject controlled disturbances while isolating the device under test, ensuring accurate and repeatable test conditions.

With a frequency range of 30 Hz to 250 kHz and a turns ratio of 2:1, the CDT 3200 supports both AC and DC signal injection without core saturation. Its robust design allows handling of high secondary currents, making it suitable for demanding automotive, aerospace, and industrial EMC environments.

The transformer supports multiple configuration options, enabling flexible use depending on test requirements. It can be used with different primary and secondary impedance setups, allowing engineers to adapt quickly across various test scenarios.

Fig. 1. Principal circuit diagram of CDT 3200

The windings are insulated from the housing. The connections are not touch-proof therefore the usage is only allowed in a closed housing.

Fig. 2. Insertion loss with 2 Ω on primary and 0.5 Ω on secondary

At The EMC Shop, the CDT 3200 is typically integrated into conducted immunity test setups alongside signal generators and amplifiers. It helps engineers simulate real-world interference conditions, identify system vulnerabilities, and validate product performance before compliance testing.