This document is intended to guide the operator in using the cavity electronic feedback and its EPICS slow control interface.
This document  explains how to use it and give answers to the frequently asked questions .

• Ensure that all the electronic boards are well interconnected, the power is on in each place and the optical setup is ready (laser on for instance)
• Go in front of a computer's station  and load EPICS slow control front panel
• load the optical setup's front panel

To control the electronic feedback you need two EPICS  windows that you can find in the optical setup front panel:  servo control and modulation control windows.

To make some measurement  you have to use the oscilloscope. You can recall setups and save waveform.

When the electronic setup is set and you only want  to lock the feedback you have:

(1) Push the button ON in the top right corner of the Optical front panel .

(2) Wait a few seconds that the laser beam becomes stable .

(3) Push the button ON in  the servo control's window .

(4) Then go to Optical front panel  and push the button ON in the botton left corner of the window .

The feedback is lock when all integrator stages are green.

2- FREQUENTLY ASKED QUESTIONS

If some problems occures with the electronic feedback see the check list. This checklist explains:

• how the interconnection should be
• what is the right setup for the ramp generator and the yokogawa generator
• how to tune the servo gain when there is too much noise on the error signal
• How to tune the tracking threshold if you can not automaticly lock the feedback
• How to ensure that automatic tracking is allowed
• What do you need to check if the remote control doesn't work
• How to recall scope's setups
• How to save waveform on the oscilloscoppe