Unit 53: Electronic Measurement and Testing
Assignment 2: Selecting, Using and
Calibrating Electronic Test equipment
, Task 1
Select test equipment and use measurement techniques to carry out the following tasks
1. Investigate the frequency range of a laboratory function generator which is set up to give a
square wave output using appropriate test equipment. Approximately at what frequency does
noticeable distortion of the waveform occur and how does this relate to the bandwidth of the
oscilloscope?
2. Determine the approximate internal resistance of the laboratory power supplies using
appropriate test equipment
3. Measure the input and output waveforms of an operational amplifier and determine the phase
shift incurred by the circuit
4. Measure and record the output of a 555 timer. Find the rise time of the signal and relate to the
bandwidth.
Part 1
The frequency of the function generator is 138.3KHz
The distortion of the sine signal wave starts at 320KHz
Waveforms distortions are common power problems that cause equipment to malfunction and sources
of power to overload. It is an unexpected change in the waveforms of current and voltage as they pass
through a device.
The frequency that we give from the function generator and the frequency the oscilloscope measures
is 140KHz (138.3). Theoretically, based on the 5 times rules, the signal should not distort before the
700KHz (5x140 which is the original measurement from the oscilloscope). Practically the distortion
occurred at 320KHz and not after 700KHz.
Part 2
The voltage is 10v (there is uncertainty in the circuit because of the quality of the cables and the
probes, so the readings might be slightly inaccurate)
Voltage Off load: it’s the voltage with no resistor which is 11.62V
Voltage on load: It’s the voltage with a resistor which is 11.53V
A: The current is in series which is 1.01mA
11.62−11.53
Internal impedance/resistance: =90 ohm
1,01
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