When you choose an Injection Tranformer for Loop Gain measurements, don't forget to check the following important parameters:
Isolation capabilities
Bandwidth and Gain flatness
Primary to secondary capacitance
Saturation
Check out the video to learn more about the properties of the B-WIT 100 Wideband Injection Transformer and the B-LFT 100 Low Frequency Injection Transformer from OMICRON Lab and how they compare to a third-party product.