The Picotest J2101A is used to inject a signal, normally into a control loop to measure the stability of DC-DC converters. It has been designed with a bandwidth from 10Hz to 45MHz and is frequently used with a Vector Network Analyser.
Picotest offers two different injection transformers specially optimized for different applications. Both are constructed with materials that are superior to most other injection transformers, resulting in greatly improved bandwidth, durability, and overall performance. The usable bandwidth of the Picotest injection transformers is greater than the 3dB frequency limits.