RPSGT Exam 2023 with complete solutions (Instrumentation/ Waveforms)

According to the principles of differential amplification, electrical interference can best be prevented if The impedances of input elecrodes are similar During a recording, the technologist notices that the HFF on an EOG channel is set at 15Hz. Which of the following is correct? Rapid eye movement signals will be attenuated G1 receives an input voltage of -100uv while G2 simultaneously receives -50uv. The polysomnograph sensitivity is set at 10uv/mm. What will be the pen deflection? 5 mm upward Sensitivity can be explained in which of the following equations? Sensitivity = voltage/pen deflection Which of the following is a function of a differential amplifier? To record the differences in the voltages of two inputs Which of the following low/high filter settings are most appropriate for these channels? 0.3/35 0.1/35 1.0/35 10/70 Changing the sensitivity of an amplifier from 5uv/mm to 10uv/mm will Reduce the pen deflection by one half What is an example of a transducer signal? flow channels and respiratory effort channels G1 = -25uv. G2 = -25uv. What is the output voltage? 0uv The technician notices equal time constant settings for the chin EMG and the EEG channels during the initial calibrations. What sort of effects might one see in the EMG channel? Respiratory artifacts in the EMG G1 = -80uv. The output voltage is 20uv. What is the voltage at G2? -100uv The tech is setting up the Grass Polysomnograph. They perform machine calibrations by applying a 50uv voltage to each input. The machine sensitivity is set at 5uv/mm. What should be the height of each pen deflection? 10 mm A low filter is set at 1hz. Which of the following statements are true? signals at 1hz will be attenuated and may lead to an under scoring of SWS Which of the following filter combinations would be most appropriate for recording the EEG in polysomnography? LFF = 0.3hz HFF = 30hz