Function Generators and Oscilloscopes - Revision history

Bsboggs at 20:35, 19 January 2022

2022-01-19T20:35:19Z

Admin: /* Exporting Data */

2016-02-08T22:22:36Z

‎Exporting Data

Admin: /* Exporting Data */

2016-02-08T21:16:09Z

‎Exporting Data

Admin at 21:00, 8 February 2016

2016-02-08T21:00:37Z

Admin: /* Termination */

2016-02-08T20:59:09Z

‎Termination

Admin: /* Termination */

2016-02-08T20:56:48Z

‎Termination

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2016-02-08T20:54:44Z

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2016-02-08T20:50:19Z

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2016-02-08T20:48:55Z

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2016-02-08T20:46:52Z

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@@ Line 353: / Line 353: @@
 <ul><li>Set the "Cursor A" control to CH2 and move the cursor to the "corner" where the voltage turns on or off. You can eye-ball it, or move watch the "A->Y" chart value goes above 0V. </li>
 <li> Set the "Cursor B" control to CH1 and move this cursor so that the "|ΔX|" value in the chart is 0s. Here, the time-separation between the two cursors is zero.</li>
-<li> What is the voltage read at cursor B (the "B-> X" value in the chart)? This is the minimum voltage needed for current to flow through the resistor.</li>
+<li> What is the voltage read at cursor B (the "B-> Y" value in the chart)? This is the minimum voltage needed for current to flow through the resistor.</li>
 </ul>
 <li> <b> X-Y Time Basis</b>: Press the "Menu" button in the middle of the horizontal control column. Use the menu buttons to change the "Time Base" from Y-T to X-Y. This shows the voltage in channel 1 plotted along the x-axis and the voltage in channel 2 plotted along the y-axis.

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 == Exporting Data==
-With the function generator, square wave with an amplitude of 0.8V and frequency 715 Hz. Use the measure menu to display the RMS voltage of the signal from the function generator. Record a single trace of this wave on the oscilloscope, showing at least 12 complete waves.
+With the function generator, sine wave with an amplitude of 0.8V and frequency 715 Hz. Use the measure menu to display the RMS voltage of the signal from the function generator. Record a single trace of this wave on the oscilloscope, showing at least 12 complete waves.
 <ol>
 <li> <b>Exporting Data</b> Insert a USB storage device into the USB slot on the front of the oscilloscope.
 <ul>
-<li></li>
+<li>Press the Storage button and change the storage menu item to CSV.</li>
 </ul>
 </ol>

← Older revision		Revision as of 21:16, 8 February 2016
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	== Exporting Data==		== Exporting Data==
		+	With the function generator, square wave with an amplitude of 0.8V and frequency 715 Hz. Use the measure menu to display the RMS voltage of the signal from the function generator. Record a single trace of this wave on the oscilloscope, showing at least 12 complete waves.
		+
		+	<ol>
		+	<li> <b>Exporting Data</b> Insert a USB storage device into the USB slot on the front of the oscilloscope.
		+	<ul>
		+	<li></li>
		+	</ul>
		+	</ol>

← Older revision		Revision as of 21:00, 8 February 2016
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−		+	== Exporting Data==
−	~~Oscilloscope Topics:~~
−	~~<ul>~~
−	~~<li> Voltage/time scale XXXXX </li>~~
−	~~<li> Coupling XXXXXXX</li>~~
−	~~<li> Triggering XXXXXXX </li>~~
−	~~<li> Scope probes XXXXXXXX </li>~~
−	~~<li> Termination XXXXX </li>~~
−	~~<li> Bandwidth, sampling XXXX </li>~~
−	~~<li> Aliasing XXXXXX </li>~~
−	~~<li> Analyzing data: cursors XXXX, averaging XXXXXXX, math menu XXXXX~~
−	~~<li>~~ Exporting ~~data </li>~~
−	~~<li> Analog and digital scopes </li>~~
−	~~</ul>~~

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 <li> For using the oscilloscope to measure voltages in a circuit, do you think having a larger or smaller termination voltage would be preferred? Why?</li>
 </ul>
-There are ways to prevent loads from affecting the behavior of voltage dividers, but they will not be discussed here.</li>
+There are ways to prevent loads from affecting the behavior of voltage dividers. See the Electronics Obstacle Course section on [http://hank.uoregon.edu/wiki/index.php/Electronics_Obstacle_Course#Instrumentation_and_Loading Instrumentation and Loading] for more information.</li>
 <li> To look at the effects of the terminator more carefully, let's remove the voltage divider entirely: connect the output of channel 1 of the function generator to the terminator and then directly to the oscilloscope.</li>
 <li> The function generator output also has a resistance between the positive and negative outputs of each channel. What is this resistance (it is on the front of the function generator)?</li>

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 <li> The oscilloscope has an input resistance, that is there is a resistor connecting the positive and negative inputs of each channel of the oscilloscope. What is that resistance (it can be read from the front of the oscilloscope)? With your answer from the previous question, does this lead you to trust the voltage readings of the oscilloscope without a terminator?</li>
 <li> The termination resistance (or the input resistance of the oscilloscope) and the 2nd resistor in the voltage divider are acting in parallel, such that the termination resistance is acting as a <i>load</i> on the voltage divider - that is some extra electrical component that the voltage divider is supplying voltage for. The effective resistance of the two resistors in parallel is <math>R'=\frac{R_2 R_{term}}{R_2+R_{term}}</math>.
-<ul><li>For a very small termination resistance (<math>R_{term} << R_2</math>), how does the effective resistance, <math>R'</math> compare to the two resistances, <math>R_2</math> and <math>R_{term}</math>?</li>
+<ul><li>For a very small termination resistance (<math>R_{term} << R_2</math>), how does the effective resistance, <math>R'</math> compare to the two resistances, <math>R_2</math> and <math>R_{term}</math>? How would <math>R_{term}</math> affect the voltage across resistor 2 above?</li>
-<li>If the termination resistance is much larger than the resistance of resistor 2 (<math>R_{term} >> R_2</math>), how does the effective resistance,<math>R'</math> compare to the two resistances, <math>R_2</math> and <math>R_{term}</math>?</li>
+<li>If the termination resistance is much larger than the resistance of resistor 2 (<math>R_{term} >> R_2</math>), how does the effective resistance,<math>R'</math> compare to the two resistances, <math>R_2</math> and <math>R_{term}</math>? How would <math>R_{term}</math> affect the voltage across resistor 2 above?</li>
 <li> For using the oscilloscope to measure voltages in a circuit, do you think having a larger or smaller termination voltage would be preferred? Why?</li>
 </ul>
 <li> To look at the effects of the terminator more carefully, let's remove the voltage divider entirely: connect the output of channel 1 of the function generator to the terminator and then directly to the oscilloscope.</li>
 <li> The function generator output also has a resistance between the positive and negative outputs of each channel. What is this resistance (it is on the front of the function generator)?</li>

@@ Line 504: / Line 504: @@
 <li> For example, individual photons can be measured by many devices, including an Avalanche Photo-Diode (APD). These will convert a photon it sees into a very short (nanosecond long) electric pulse. Counting these pulses with a device that is not properly impedance matched to the APD can result in photon counts that are too high - a portion of the electron pulse is reflected back to the APD, then back towards the counting device and counted a 2nd time. This can repeat a number of times, giving photon counts that are much higher than are actually being detected.
 </ul>
-<li> Often, oscilloscopes have settings that can change the input impedance of the oscilloscope (note that the oscilloscope you are using does not). This allows you to easily set up the scope for making correct measurements that you would like.</li>
+<li> Often, oscilloscopes have settings that can change the input impedance of the oscilloscope (note that the oscilloscope you are using does not). This allows you to easily set up the scope for making appropriate measurements.</li>
 </ol>