d2:laser_servo
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d2:laser_servo [2018/12/17 19:13] – [Reconfigurable Laser Servo] Michael Radunsky | d2:laser_servo [2019/08/28 23:25] – [Monitor Section] Michael Radunsky | ||
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Located at the top of the front panel, the monitor section contains 6 BNC outputs for monitoring various signals used by the Laser Servo. The logic of the monitors is shown in <imgref image1> | Located at the top of the front panel, the monitor section contains 6 BNC outputs for monitoring various signals used by the Laser Servo. The logic of the monitors is shown in <imgref image1> | ||
- | <WRAP center round box 420px>< | + | <WRAP center round box 420px>< |
**Error In** | **Error In** | ||
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**Auxiliary Servo Output** | **Auxiliary Servo Output** | ||
- | The AUXILIARY SERVO OUTPUT is generated from integrating the SERVO OUTPUT. | + | The AUXILIARY SERVO OUTPUT is generated from integrating the SERVO OUTPUT. |
**Ramp Offset** | **Ramp Offset** | ||
Line 243: | Line 243: | ||
===Auxiliary Servo: Gain (25-turn trimpot)=== | ===Auxiliary Servo: Gain (25-turn trimpot)=== | ||
- | This trimpot sets the gain for the AUXILIARY SERVO OUTPUT. The Aux Servo is a pure integrator and the gain ranges from 500 μs to 5 s. | + | This trimpot sets the gain for the AUXILIARY SERVO OUTPUT. The Aux Servo is a pure integrator and the gain ranges from 500 μs to 5 s. Full ccw sets gain to minimum (5 s), full cw sets gain to maximum (500 µs). |
<WRAP center round box 420px>< | <WRAP center round box 420px>< | ||
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** Ramp-> | ** Ramp-> | ||
- | This 2-position slider switch is only accessible by removing the right side panel (see above) and sets whether the ramp is applied to the SERVO OUTPUT or the AUXILIARY SERVO OUTPUT. It is factory set in the Ramp-> | + | This 2-position slider switch is only accessible by removing the right side panel (see above) and sets whether the ramp is applied to the SERVO OUTPUT or the AUXILIARY SERVO OUTPUT. It is factory set in the Ramp-> |
===Aux Gain: + / Aux Gain - (2-position switch)=== | ===Aux Gain: + / Aux Gain - (2-position switch)=== | ||
Line 326: | Line 326: | ||
**Relative Jump TTL (BNC)** | **Relative Jump TTL (BNC)** | ||
- | When asserted HIGH (5V) while in LOCK mode, RELATIVE JUMP engages a sample-and-hold circuit and takes the Laser Servo out of lock. The voltage on the SERVO OUTPUT is the sample-and-hold value summed in with the LASER JUMP AMPLITUDE. For example, if the laser is locked and the SERVO OUTPUT is -200 mV, then engaging the RELATIVE JUMP and putting 300 mV on the LASER JUMP AMPLITUDE will make the SERVO OUTPUT | + | When asserted HIGH (5 V) while in LOCK mode, RELATIVE JUMP engages a sample-and-hold circuit and takes the Laser Servo out of lock. The voltage on the SERVO OUTPUT is the sample-and-hold value summed in with the LASER JUMP AMPLITUDE. For example, if the laser is locked and the SERVO OUTPUT is -200 mV, then engaging the RELATIVE JUMP and putting 300 mV on the LASER JUMP AMPLITUDE will make the SERVO OUTPUT |
When asserted HIGH (5V) while in RAMP mode, RELATIVE JUMP applies a DC offset equal to the LASER JUMP AMPLITUDE to the ramp signal at SERVO OUTPUT. When asserted LOW (0V) while in RAMP mode, the ramp signal is DC balanced. | When asserted HIGH (5V) while in RAMP mode, RELATIVE JUMP applies a DC offset equal to the LASER JUMP AMPLITUDE to the ramp signal at SERVO OUTPUT. When asserted LOW (0V) while in RAMP mode, the ramp signal is DC balanced. | ||
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If you are having problems locking the laser, it is a good idea to not use the AUXILIARY SERVO OUTPUT as this complicates the system. Once you get the locking to work properly, you can reconnect this cable. | If you are having problems locking the laser, it is a good idea to not use the AUXILIARY SERVO OUTPUT as this complicates the system. Once you get the locking to work properly, you can reconnect this cable. | ||
- | <imgref factory_settings> | + | <imgref factory_settings> |
<WRAP center round box 400px>< | <WRAP center round box 400px>< | ||
- | {{ {{ d2:d2-125:factory_settings.jpg? | + | {{ {{ d2:d2-125:factory_settings_red.png? |
+ | |||
+ | <WRAP center round box 60%>< | ||
+ | | **Corner** | ||
+ | | First Integrator (high freq.) | ||
+ | | First Integrator (low freq.) | ||
+ | | Second Integrator (high freq.) | ||
+ | | Second Integrator (low freq.) | ||
+ | | Differential (high freq.) | ||
+ | | Differential (low freq.) | ||
+ | |||
+ | </ | ||
| |
d2/laser_servo.txt · Last modified: 2021/12/17 01:58 by 127.0.0.1