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This group includes the readback waveform at the top.
| Name | PV | Description |
|---|---|---|
| Tune Following Frequency | :PLL:NCO:OFFSETWF | This waveform records the complete history of the Tune PLL offset frequency |
| Offset FIFO readout overrun | :PLL:NCO:FIFO_OVF | This will report an alarm status if the OFFSETWF waveform overruns. Typically this can happen if the detector dwell time is set too low. |
| Reset FIFO | :PLL:NCO:RESET_FIFO_S | This will force the OFFSETWF to discard any partially captured data. This is used to ensure that the next update received for MEAN_OFFSET is fully up to date. |
| Freq | :PLL:NCO:FREQ_S | When written this will set the PLL NCO to the given frequency. If feedback is running the offset will briefly be forced to zero. |
| :PLL:NCO:FREQ | This reads back the current NCO frequency. This PV updates at 10Hz. | |
| Gain | :PLL:NCO:GAIN_S | The NCO signal strength is configured here. |
| :PLL:NCO:ENABLE_S | This PV turns the NCO output on or off. | |
| Tune | :PLL:NCO:TUNE | This is the fractional tune computed from the MEAN_OFFSET value and the base frequency. This PV updates when MEAN_OFFSET updates, and is forced to NaN when feedback is not running. |
| Offset | :PLL:NCO:OFFSET | This is the current PLL offset, updated at 10Hz. |
| Mean | :PLL:NCO:MEAN_OFFSET | This is the mean offset computed over the last full OFFSETWF waveform. |