Speed of Light

If the scope is already on press the default setup

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Unformatted text preview: screen). If the scope is already on, press the DEFAULT SETUP button on the top-right. 2. You should see two baseline “noise” traces – Yellow for CH1 and Blue for CH2; this is merely background noise since nothing is yet plugged into the scope. a. Experiment with adjusting the vertical position of both traces by adjusting the Vertical Position knobs above the CH1 Menu and CH2 Menu buttons – this will allow you to arrange your plots so that they are not on top of one another. b. Now fiddle with the Sec/Div knob – this sets the size of your time window (horizontal axis). If you set the value (look at the “M” value right above the date/time on the bottom of the screen) to something like 500ms, it'll look like one of those patient monitoring displays at the hospital. The M value is the time interval you'll be observing; you can set a large value to observe many pulses or a small value to zoom in on a single pulse. Note that this scope will let you examine a time window on the order of a few nanoseconds – an extremely short instant of time. c. Restore the Sec/Div knob to some intermediate value and now adjust the Volts/Div on each channel – this adjusts the gain, or sensitivity of the trace. At the highest setting the traces will fluctuate wildly (but randomly); at the lowest setting they'll be relatively calm. 3. If there aren't any T-connectors on the CH1 and CH2 jacks, connect them by inserting and gently turning the ribbed tightener grip clockwise (this is a bayonet mount; gently turn counterclockwise and pull to remove). Let's now plug in the laser (colored box with push-button and jack sticking out) by connecting it to CH2 of the scope using one of the short black coaxial cables. Remember, you'll have to connect to the Tconnector plugged into that channel (no T-connector on laser end). Leave the other end of the T-connector open. 4. Turn on the laser by pressing the pushbutton, and make sure that the red beam comes out of one of the short sides of the box; just make sure the be...
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