According to some embodiments, there is provided a signal generating device, including a signal generator and a local signal generating unit. The selector circuit is responsive to an output signal from an associated power management unit. The mobile application is related to the web services application deployable on a mobile device. The apparatus is caused to assign the target number of reported image studies to the identified users. In an exemplary embodiment, ink ejection flow rates are adjusted to keep delivery pressures safely at or below the maximum sustainable delivery pressure required to protect a micro-fluid ejection device of a printhead assembly.