One of the unique features of Venable Instruments’ Frequency Response Analyzers is input/output isolation. The generator (oscillator) output and measurement channel inputs are isolated from chassis ground, and are rated to 600Vpk. This allows the user to connect the generator and channels directly to the circuit under test. However, there are some considerations that Venable FRA users should note to prevent damage to the instrument. The 600Vpk rating is a common mode rating with respect to chassis ground, but lower voltages can cause damage. The following presentation discusses the differential ratings of the generator and channels and how impedance settings affect these ratings.