If you are having problems with your FS725 you can call us at
If you wish to try and fix the problem yourself, the user manual may be useful, and the following troubleshooting guide may be helpful too.
1) Upgrade existing units with additional distribution outputs
If you want to upgrade your existing FS725 unit with optional Distribution Amplifiers, you can either send your instrument back to SRS for service or you can try installing the option yourself.
Click here to download the installation procedure. You will need to call SRS at
2) The 1 pps output has a slow rise time
Click here to download a detailed explanation of the 1 pps output characteristics.
If you are still having trouble your FS725, it will need to come back to SRS for service. Click here to get an RMA number.