4.1 Preliminaries
Remove any input cables to the scope. Turn on the scope (2). In a few seconds you should
see a trace which is a horizontal line. If you do not, check your initial control settings and
press the AUTO button. Leave the trace centered. Turn the time base switch (15) to 0.25
s and note the light spot move slowly across the screen until it gets to the right hand side
of the screen. What happens then? Investigate the effect of turning the time base knob
(15). Increase the horizontal sweep speed one click at a time and note how the moving spot
becomes a solid line. Observe that there is a range of sweep speeds for which the trace
“flickers.”
When you need to make measurements of an input signal (peak voltage, period, etc.), it
is useful to use the two position controls (11, 16) to move parts of the trace onto the gridlines
of the screen that have finer divisions.
4.2 Observing Voltage From The Function Generator
This function generator produces sine, square and triangular waveforms which are selected
by three pushbuttons. The frequency of these waveforms can be adjusted from 0.3 Hz to
3 MHz by means of a knob marked frequency and 7 pushbuttons. The output frequency
appears in the middle of the display panel. At the bottom of the display panel to the right
appear Hz, and in the middle of the bottom there may a multiplier for Hz such as k or M.
It is important to check for the k or M to determine whether the stated frequency is in kHz
or MHz. The multiplier appears and vanishes automatically as you cross certain threshold
frequencies such as 1 kHz. The amplitude of the output is varied by a knob at the right
marked AMPL. The knobs have “in” and “out” positions. The functions for the knobs are
marked in black for the “in” position and blue for the “out” position. While using this
instrument as a simple function generator be sure all the knobs at the bottom of the front
panel are in and that the only two green LED’s that are on are one for the waveform chosen
and one for the frequency range (buttons at top). Below is an illustration of some of the
buttons and the output you will be using from the function generator.
7
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