FEKT VUT v BrněHESO / L2 / J.Boušek1 THE OSCILLOSCOPE - shows graphically the behavior of an electrical signal - qualitative measurement type rather than quantitative - low precision for both voltage and frequency

FEKT VUT v BrněHESO / L2 / J.Boušek2 WORKING PRINCIPLE OF OSCILLOSCOPE

FEKT VUT v BrněHESO / L2 / J.Boušek3 WORKING PRINCIPLE OF OSCILLOSCOPE - Y AXIS - Vertical = Voltage: V/Div; mV/Div - X AXIS - Horizontal =TIME BASE: s/Div; ms/Div; µs/Div; ns/Div - The vertical axis is driven by the input signal - The horizontal one by the internal time base

FEKT VUT v BrněHESO / L2 / J.Boušek4 WORKING PRINCIPLE OF OSCILLOSCOPE Example: 1V/Div (2V peak-to-peak); 10 µs/Div (25 kHz). - Without input signal : flat line. - Switching the the gain - change of divisions in Y axis. - Switching the time base - change of frequency

FEKT VUT v BrněHESO / L2 / J.Boušek5 OSCILLOSCOPE - TRIGGER !! every scan draws a new trace !! result on the screen

FEKT VUT v BrněHESO / L2 / J.Boušek6 Trigger event: - input signal crosses the trigger level - detection by voltage comparator - rising (positive) OR falling (negative) edge - trigger starts new scan For constantly repeated waves: 1) Identical trigger event restarts a new scan 2) New picture retrace exactly the previous shape Result : stable waveform on the grid (Signal is : triggered ; locked ; coupled ; hooked up) OSCILLOSCOPE - TRIGGER

FEKT VUT v BrněHESO / L2 / J.Boušek7 Trigger-setting 1)Select the edge - positive or negative. 2) Set the trigger voltage level. OSCILLOSCOPE - TRIGGER

FEKT VUT v BrněHESO / L2 / J.Boušek8 SINGLE - one shot mode - the scan starts only once at first trigger event - for next scan new start needed (manually) NORMAL - scan restarts only on trigger event - at the end waiting for next event - with no trigger events - not any trace AUTO - scan restarts automatically at each end of scan - trace is always shown without input signal - small signal does generate “trigger”- sliding waveforms OSCILLOSCOPE - TRIGGER

FEKT VUT v BrněHESO / L2 / J.Boušek9 DIGITAL OSCILLOSCOPE

FEKT VUT v BrněHESO / L2 / J.Boušek10 DIGITAL OSCILLOSCOPE Tektronix

FEKT VUT v BrněHESO / L2 / J.Boušek11

FEKT VUT v BrněHESO / L2 / J.Boušek12 OSCILLOSCOPE: Mind the ground connection !!!!

FEKT VUT v BrněHESO / L2 / J.Boušek13 DIGITAL MULTIMETER METEX

FEKT VUT v BrněHESO / L2 / J.Boušek14 DIGITAL MULTIMETER METEX

FEKT VUT v BrněHESO / L2 / J.Boušek15 POWER SUPPLY: MIND THE TERMINALS !!

FEKT VUT v BrněHESO / L2 / J.Boušek16 EXPERIMENTAL BOARD

FEKT VUT v BrněHESO / L2 / J.Boušek17 EXPERIMENTAL BOARD: DIODE RECTIFIER

FEKT VUT v BrněHESO / L2 / J.Boušek18