Transfer characteristics of an ink-jet writer for cardiovascular studies

The transfer characteristic of a 16 channel ink-jet writer used in a cardiovascular laboratory is described. The test method for measuring linearity, gain and phase response is described and results given. The transfer function was calculated from the normalized experimental results and allows prediction of the behaviour of the writer for different input signals. It is shown that the ink-jet galvanometers are linear for signal input amplitudes between 0 and 2.5 V, and have a flat frequency response between DC and 640 Hz (+/- 1%).