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playground:change [2012/02/07 14:54] 132.235.40.1 |
playground:change [2017/04/17 11:47] jacobs |
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- Switch OVERVOLTAGE PROTECTION to DISABLE. | - Switch OVERVOLTAGE PROTECTION to DISABLE. | ||
- Switch the control mode to GVM. | - Switch the control mode to GVM. | ||
- | - Turn the CONTROL GAIN to zero. | + | - Slowly turn the CONTROL GAIN to zero while watching the grid voltage. If the grid voltage rises above -5 volts, reduce the CHARGING VOLTAGE to keep the grid voltage less than -5 volts, then continue reducing the CONTROL GAIN to zero. |
- | - To go to a higher energy move the CORONA PROBE POSITION "OUT" while raising the CHARGING VOLTAGE. **__NEVER__** allow the GRID VOLTAGE to go more negative than -10 VDC during this operation. | + | - To go to a higher energy move the CORONA PROBE POSITION "OUT" while raising the CHARGING VOLTAGE. **__NEVER__** allow the GRID VOLTAGE to go more negative than -5 VDC during this operation. |
- | - To go to a lower energy move the CORONA PROBE POSITION "IN" while lowering the CHARGING VOLTAGE. **__NEVER__** allow the GRID VOLTAGE to go more negative than -10 VDC during this operation. | + | - To go to a lower energy move the CORONA PROBE POSITION "IN" while lowering the CHARGING VOLTAGE. **__NEVER__** allow the GRID VOLTAGE to go more negative than -5 VDC during this operation. |
- Set the TERMINAL VOLTAGE Dial to the desired value. The dial is 2 turns per MV (set the dial to twice the GVM you want). You may have to add some upcharge after setting the dial. | - Set the TERMINAL VOLTAGE Dial to the desired value. The dial is 2 turns per MV (set the dial to twice the GVM you want). You may have to add some upcharge after setting the dial. | ||
- Raise the CONTROL GAIN to 2-3 for low current beams, around 5 for high current beams. The system is now controlling in GVM mode. | - Raise the CONTROL GAIN to 2-3 for low current beams, around 5 for high current beams. The system is now controlling in GVM mode. |