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?