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Status Feedback. Three feedback lines are available to furnish continuous status information to the controller.
A flag line informs the computer when new voltage programming data is being processed by the DVS. Current
overload and latch lines are activated if the DVS experiences a current overload or latch condition.
Digital Current Source (DCS)
The DCS is a bipolar Constant Current/Voltage Limiting power source. A DCS unit contains most of the same
circuit elements that were shown for a DVS unit; including, interface and isolation circuits, storage, D/A
converter, and a bi-polar output amplifier. One difference is, of course, that a DCS unit has a programmable
voltage limit circuit rather than a programmable overcurrent circuit. The voltage limit circuit returns two
overload status signals to the controller in a manner similar to the DVS overcurrent circuit.
The DCS also employs guarding techniques that are conceptually identical to those of the Precision Constant
Current Source described earlier in this section. As mentioned previously, these guarding techniques prevent
the flow of leakage current and allow a more precise regulation of the output current.