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Suggested definition of 'differences' to be shown by tuneDisplay for various devices:
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* Quads (both magnetic and electrostatic): The percent difference between the quad's calculated setpoint (current or voltage) ($`SP_{theo}`$) and its actual setpoint ($`SP_{act}`$). $`\Delta = \frac{100 \cdot \left( SP_{act} - SP_{theo}\right)}{SP_{theo}}`$
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* Quads (both magnetic and electrostatic): The percent difference between the quad's calculated setpoint (current or voltage) ($`SP_{theo}`$) and its actual setpoint ($`SP_{act}`$).
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```math
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\Delta = \frac{100 \cdot \left( SP_{act} - SP_{theo}\right)}{SP_{theo}}
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```
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* Electrostatic steerers: the difference will be the actual steering voltage (steerer setpoint minus common plate setpoint) minus the calculated steering voltage (steerer setpoint minus common plate setpoint), divided by the the full scale of the steerer supply (1000 V for most steerers in ISAC), multiplied by the maximum source voltage over the actual source voltage.
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`Diff = 100*[(actual_steering - calc_steering)/steerer_range]*(max_source_vol/actual_source_vol)`
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