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| d2:laser_servo [2018/11/14 17:37] – [Right Side Panel] Michael Radunsky | d2:laser_servo [2018/11/14 17:38] – [Right Side Panel] Michael Radunsky |
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| {{ :d2:d2-125:d2-125_side_panel.jpg?direct&400 |}}</imgcaption></WRAP> | {{ :d2:d2-125:d2-125_side_panel.jpg?direct&400 |}}</imgcaption></WRAP> |
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| The feedback loop is defined by the Gain vs Frequency plot shown above. ƒ<sub>I</sub>, ƒ<sub>PI</sub> and ƒ<sub>D</sub> define three zeros in the transfer function. ƒ<sub>I</sub> and ƒ<sub>PI</sub> are the frequencies where the first and second integrators respectively switch from having integral gain to having proportional gain. ƒ<sub>D</sub> is the frequency where the gain switches from proportional to differential. ƒ<sub>I</sub>, ƒ<sub>PI</sub> and ƒ<sub>D</sub> are controlled by two rotary switches, where the upper switch is used to select higher frequencies, and the lower switch is used for selecting the lower frequencies. The upper switch must be in the "low freq" position to engage the lower switch. | The feedback loop is defined by the Gain vs Frequency plot shown above. ƒ<sub>I</sub>, ƒ<sub>PI</sub> and ƒ<sub>D</sub> define three corners in the transfer function. ƒ<sub>I</sub> and ƒ<sub>PI</sub> are the frequencies where the first and second integrators respectively switch from having integral gain to having proportional gain. ƒ<sub>D</sub> is the frequency where the gain switches from proportional to differential. ƒ<sub>I</sub>, ƒ<sub>PI</sub> and ƒ<sub>D</sub> are controlled by two rotary switches, where the upper switch is used to select higher frequencies, and the lower switch is used for selecting the lower frequencies. The upper switch must be in the "low freq" position to engage the lower switch. |
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| //NOTE: Adjusting the loop filter poles and zeros while locked may result in loss of lock. If this happens, unlock laser before adjusting poles and zeros and relock laser after adjustment. // | //NOTE: Adjusting the loop filter corners while locked may result in loss of lock. If this happens, unlock laser before adjusting poles and corners and relock laser after adjustment. // |
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| //NOTE: The triangle embedded in the rounded side of each click switch points to the selected value. // | //NOTE: The triangle embedded in the rounded side of each click switch points to the selected value. // |
