> For the complete documentation index, see [llms.txt](https://docs.ndi.video/all/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ndi.video/all/developing-with-ndi/ndi-certified/certification-process/testing-methods/sdi-encoder.md).

# SDI Encoder

1. Check for [Interoperability](/all/developing-with-ndi/ndi-certified/certification-guidelines/interoperability-requirements.md)
2. If the computer supports SDI as a monitor output, run the test as an HDMI encoder. If it does not, continue on.
3. Set the Testing application on a testing monitor
4.  Connect a previously tested SDI camera to the SDI encoder, and position and it towards the testing application as if you were testing the PTZ result
5. On the testing application, connect to the Encoder’s NDI output
6. Run the tests, and subtract the average of the PTZ camera’s previous results from the SDI encoder’s results

<figure><img src="https://3444609009-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDO9LSaUxLOBIgPjyrjR1%2Fuploads%2FVI9RixEWi4hiP6AS03Ln%2Fimage.png?alt=media&amp;token=24ad3e12-7225-457c-9d7c-5c0e310e05d2" alt=""><figcaption></figcaption></figure>


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