Name:______________________________ Date:___/___/____ Time ___ Name:______________________________ Assistent:______________________ FYSP110/K1. (FYSP105/K1.) How to use an oscilloscope (mark the correct course code!) Measurements: Getting acquainted: Explain what happened 0. Calibration of the oscilloscope (error estimates are not required) Settings of the scope (leave empty if not significant): VOLTS/DIV. TIME/DIV. AC - DC Amplitude:_____________ Period: _____________ Frequency:_____________ Draw a figure. Did you find any systematic error? 1. DC voltage Digital meter:_____________________ Analogue meter:_____________________ Settings of the scope (leave empty if not significant): TRIG. MODE AT/NM VOLTS/DIV. TIME/DIV. AC - DC TRIG. MODE AT/NM 1.5 V battery Flat battery EMF (digital) EMF (analogue) EMF (oscilloscope*) 1.5 V battery ± ± ± Flat battery ± ± ± * the final uncertainty involves both the reading error internal error (3 % according to the manufacturer) 1.5 V battery: Voltage with the scope ____________ , reading error ___________ Calculated internal error __________________________________ Flat battery: Voltage with the scope ____________ , reading error ___________ Calculated internal error ___________________________________ Comments: 2. AC voltage Is it better to determine the period time from just one period or several periods? Justify your answer! Where is good starting point for the determination of the period? Peak and effective values of the AC voltage Digital meter used:_____________________ Analogue meter used:_____________________ Settings od the scope (leave empty if not significant): VOLTS/DIV. TIME/DIV. digital AC - DC TRIG. MODE analogue AT/NM oscilloscope* Umax Ueff ± ± ± ± * Error estimate as in task 1. Ueff is calculated from Umax (Ueff = effective value). Umax with oscilloscope ____________ , reading error ___________ Calculated internal error ___________________________________ Umax and it’s total error ________ ± ________ Calculated Ueff together with error estimate ________ ± ________ Freguency of AC voltage (Note. Internal error for time measurements is according to the manufacturer 3 % of the reading.) Period from oscilloscope ______________ , reading error _____________ Internal error ___________________________________ Period together with total error ________ ± ________ Calculated frequency with error ________ ± ________ Period as given by a general purpose meter (Finest 703 or a corresponding meter) ________ ± ________ Comments: 3. Summing AC and DC voltages Resistances (no error bars): Meter Resistance Plot voltages as measured in AC, DC and GD modes (mark the scales!). Answers to the questions: 4. Pulse generator (error bars not required) Settings of the scope (leave empty if not significant): VOLTS/DIV. TIME/DIV. AC - DC TRIG. MODE AT/NM DC Height of pulse: __________ Period: ___________ Frequency: ___________ Plot the pulse. What difference does it make if you use AC mode instead of DC? Why? 5. The signal generator (no error bars) Settings of the scope (leave empty if not significant): VOLTS/DIV. TIME/DIV. AC - DC TRIG. MODE AT/NM various Reading of generator (fgen) amplitude Period of sine wave Frequency from the previous(fosc) fosc / fgen Comments on the accuracy of the reading of the generator: 6. Testing the diode and characteristic curve Settings of the scope: Inputs: DC in both channels, X-Y: on, INV: on in y-channel Remember to check the zero voltage positions using the GD mode Draw a figure showing the wiring in the measurement (mark the measured values of the components): Plot the characteristic curves (mark the scales). Threshold: (meter 1) Threshold: (meter 2) Threshold: (oscilloscope) Ge- diode ± Si- diode ± Literature value How do you calibrate the voltage plotted on y axis to the current? Find out how the general purpose meters you used determine the threshold voltage What is your opinion, which one of the methods (general purpose meter or oscilloscope) to determine the threshold voltage of a diode is more accurate?