DAC Setup (Version 1.3)

This screen provides access to all controls for configuring a single channel of DAC output. The following PVs can be set here (all prefixed with $(device):$(axis)):

Name	PV	Description
DAC Compensation Filter	`:DAC:FILTER_S`	This filter is applied to the generated bunch stream immediately before transmission to the DAC and can be used as a pre-emphasis filter to correct for amplifier artefacts. The valid range of taps is +-1, and the response of the filter should be adjusted to avoid overflow: this will be indicated by the DAC FIR overflow PV `:DAC:FIR_OVF`.
Output delay	`:DAC:DELAY_S`	This is used to delay the DAC output so that the closed loop delay is a single machine revolution.
Output enable	`:DAC:ENABLE_S`	Enables output to the DAC. When the MBF control IOC is restarted this is automatically set to "Off".
MMS input	`:DAC:MMS_SOURCE_S`	Min/Max/Sum data can be sourced from before or after the pre-emphasis filter.
DRAM input	`:DAC:DRAM_SOURCE_S`	Data capture to memory can be sourced from before or after the pre-emphasis filter.

The three event indicators are as follows:

Name	PV	Description
Bunch FIR overflow	`:DAC:BUN_OVF`	Shows an alarm state if the current bunch-by-bunch FIR gain results in overflow for a bunch selected for output.
DAC output overflow	`:DAC:MUX_OVF`	Shows an alarm state if the combination of DAC outputs selected by the active bank control results in overflow.
DAC FIR overflow	`:DAC:FIR_OVF`	Shows an alarm state if overflow occurs in the pre-emphasis filter.

Diagnostics (Technical) Public

DAC Setup (Version 1.3)

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