--- title: Protection Precautions for your FRA description: This deep dive walks through the steps to keep a Venable FRA from over voltage when measuring impedance. image: https://www.venableinstruments.com/hubfs/Oscillator%20Output%20Diagram%20small.jpg --- [![Venable Instruments](https://www.venableinstruments.com/hs-fs/hubfs/VenLogoInst%20%5BConverted%5D-1.png?width=115&height=45&name=VenLogoInst%20%5BConverted%5D-1.png "Venable Instruments")](https://www.venableinstruments.com) Search ## Protection Precautions for your FRA *By Ford Mays - October 02, 2023* 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.     ![iStock-157336072](https://www.venableinstruments.com/hs-fs/hubfs/Web%20Images/iStock-157336072.jpg?width=1000&name=iStock-157336072.jpg "iStock-157336072") #### Distributed Power: What Causes These Systems to Oscillate Distributed power systems can oscillate, especially when driving one power supply with another power supply. Download this white paper to learn what causes distributed power systems to oscillate and how you can prevent oscillation. [![Download White Paper](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/4867466/ba09c31a-becf-4e1b-b896-9a0c990c4fc5.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/4867466/ba09c31a-becf-4e1b-b896-9a0c990c4fc5) Comments ### Sign Up for our Blog We promise that we won't SPAM you. #### About Venable Venable provides scalable energy storage and power systems test solutions for precise voltage, current, and frequency measurements, partnering with engineers to ensure battery and power systems around the world will meet stringent field performance demands.  #### Recent news [![Venable Training - Stabilizing Power Supply Control Loops](https://www.venableinstruments.com/hubfs/Venable%20Training%20Front%20Image.jpg) **Venable Training - Stabilizing Power Supply Control Loops** 20 August 2025 ](https://www.venableinstruments.com/blog/stabilizing-power-supply-control-loops) [![The Ins and Outs of System Level Input/Output Impedance Measurements](https://www.venableinstruments.com/hubfs/Imput%20Impedance%20Test%20Set%20UP.jpg) **The Ins and Outs of System Level Input/Output Impedance Measurements** 23 June 2025 ](https://www.venableinstruments.com/blog/impedance-measurements) #### Subscribe Subscribe to our blog to receive emails and updates on scalable power and energy systems test solutions from Venable Instruments.  #### Contact us Venable Instruments 8656 SH 71 West Cuesta Centre, Building E Austin, TX 78735 Office: 512-949-3100 Fax: 512-949-3151