100
Z31980_00_03
Configuration
Field DAC Small:
The Lock is controlled by two DACs. A 12-bit coarse DAC is used for range selection
and a 12-bit fine DAC which does the actual field regulation. The resolution of the fine
DAC is about 0.025 Hz per DAC Step.
A DAC value 0 means maximal negative current and 4095 means maximal positive cur-
rent. 2047 means zero current. When the control loop is closed, this value is under con-
trol of the lock software.
Field DAC Wide:
The resolution of the wide/coarse DAC is about 50 Hz per DAC Step. When autoranging
is ON (default), this value is under control of the lock software. In case of magnet drift,
when the fine DAC gets to below 500 or above 3500, the coarse DAC is incremented or
decremented by one step, to bring the fine DAC back nearer the center of its operating
region
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