Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision |
| slice:dcc [2020/04/12 15:38] – [Programmable Input & Output] Michael Radunsky | slice:dcc [2020/04/29 21:55] – [Constant Power Mode] Michael Radunsky |
|---|
| | {{ :warning-sign.png?400&nolink }} | Warning. Make sure the Current Limit is set below the recommended maximum current for your laser diode and that the monitor photodiode is working and delivering a signal to the SLICE-DCC before engaging Constant Power mode. If a signal proportional to the laser power from the monitor diode is not delivered to the SLICE-DCC, the current may ramp to its maximum allowed value when Constant Power mode is engaged. | | | {{ :warning-sign.png?400&nolink }} | Warning. Make sure the Current Limit is set below the recommended maximum current for your laser diode and that the monitor photodiode is working and delivering a signal to the SLICE-DCC before engaging Constant Power mode. If a signal proportional to the laser power from the monitor diode is not delivered to the SLICE-DCC, the current may ramp to its maximum allowed value when Constant Power mode is engaged. | |
| </WRAP> \\ | </WRAP> \\ |
| - Connect the output of the monitor photodiode to the CH X Photodiode Input connector (labelled "10" in [[slice:dcc#rear_panel|the back-panel image]]) on the back of the SLICE-DCC.\\ \\ In order for Constant Power mode to operate correctly, the user must set three control parameters: the responsivity of the monitor photodiode, the gain of the loop filter, and the polarity of the photodiode response. Before setting these control parameters. first [[slice:dcc#setting_the_operation_mode|set the SLICE-DCC in Constant Power mode]] and [[slice:dcc#setting_the_operating_power_in_constant_power_mode|set the Power Setpoint]]. From the home screen, enter the CH X Settings screen by tapping the window labelled CH X: Constant Power. Enter values for Detector Response, Gain, and monitor photodiode Polarity. \\ \\ | - Connect the output of the monitor photodiode to the CH X Photodiode Input connector (labelled "10" in [[slice:dcc#rear_panel|the back-panel image]]) on the back of the SLICE-DCC.\\ \\ In order for Constant Power mode to operate correctly, the user must set three control parameters: the responsivity of the monitor photodiode, the gain of the loop filter, and the polarity of the photodiode response. Before setting these control parameters. First [[slice:dcc#setting_the_operation_mode|set the SLICE-DCC in Constant Power mode]] and [[slice:dcc#setting_the_operating_power_in_constant_power_mode|set the Power Setpoint]]. From the home screen, enter the CH X Settings screen by tapping the window labelled CH X: Constant Power. Enter values for Detector Response, Gain, and monitor photodiode Polarity. \\ \\ |
| - Enter the value of the detector response supplied in the documentation that came with your monitor photodiode. (<imgref cp_param_set>) <imgcaption cp_param_set|Setting the detector response for Constant Power mode>{{ slice:dcc:cp_set_responsivity_knobs.png?430x254 |}}</imgcaption> | - Enter the value of the detector response supplied in the documentation that came with your monitor photodiode. (<imgref cp_param_set>) <imgcaption cp_param_set|Setting the detector response for Constant Power mode>{{ slice:dcc:cp_set_responsivity_knobs.png?430x254 |}}</imgcaption> |
| - Turn the Gain all the way to 0 (zero). Turn the system ON to deliver current to the diode. Slowly turn up the Gain until the power begins to oscillate (<imgref cp_gain>). (Hint; It is easiest to adjust the gain for this step via the knobs as opposed to through the keypad.) Turn down the Gain until oscillation stops. <imgcaption cp_gain|Setting the Gain for Constant Power>{{ slice:dcc:cp_set_gain.png?430x254 |}}</imgcaption> | - Turn the Gain all the way to 0 (zero). Turn the system ON to deliver current to the diode. Slowly turn up the Gain until the power begins to oscillate (<imgref cp_gain>). (Hint; It is easiest to adjust the gain for this step via the knobs as opposed to through the keypad.) Turn down the Gain until oscillation stops. <imgcaption cp_gain|Setting the Gain for Constant Power>{{ slice:dcc:cp_set_gain.png?430x254 |}}</imgcaption> |
