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The chassis bypasses the amplifier if the DAC voltage is less than -1 V. There should be a bypass on/off switch that sets the DAC to something about -1.2 V (to be far from the transition). When bypassed, the path attenuates by -5.6 dB (almost a factor of 2 in voltage). When the bypass is turned off, the DAC can go to 0 V, since that gives almost the same gain, -5.2 dB. The user won’t see a big jump and can tweak from there.
Block Diagram:
Testing:
- Set registers to manipulate DAC out between -0.65 to 1.65V - use treeGUI
- Expose registers to manipulate from EPICS
- Add dB vs volatage conversion into EPICS
- Add Bypass PV which sets voltage to -1.2V. User should not be able to write to Voltage PV
- When bypass is unselected, voltage should be set to 0V
- pyDM screen
Test1.
