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university:courses:electronics:electronics-lab-external-trigger [24 Jul 2017 16:18] – change amplitude value to peak-peak Antoniu Miclausuniversity:courses:electronics:electronics-lab-external-trigger [14 Dec 2018 11:50] – add Fritzing files Antoniu Miclaus
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 Waveform generator AWG1 should be set up as a triangle wave with a 8 Volt amplitude and 0 V offset and a frequency of 5 KHz. Set the horizontal and vertical scales of the scope to display at least one complete cycle of the input triangle waveform. Turn on the power supplies only after double checking your circuit connections. Waveform generator AWG1 should be set up as a triangle wave with a 8 Volt amplitude and 0 V offset and a frequency of 5 KHz. Set the horizontal and vertical scales of the scope to display at least one complete cycle of the input triangle waveform. Turn on the power supplies only after double checking your circuit connections.
 +
 +{{ :university:courses:electronics:adjustableexternaltriggering_hardwaresetup1.png |}}
 +
 +<WRAP centeralign> Figure 2: Analog trigger circuit Breadboard Circuit </WRAP>
  
 =====Procedure:===== =====Procedure:=====
  
 To start, set the scope trigger source to Channel 1, rising edge, with the level set to 0 V. You should see the rising edge of the triangle wave on channel 1 centered on the 0 time point along the horizontal axis. The rising edge of the digital output of the second inverter on channel 2 should occur at different times along the horizontal axis depending on the setting of the potentiometer, R<sub>3</sub>. Adjust R<sub>3</sub> up and down from one end of its range to the other and observe where the rising edge of the pulse on channel 2 occurs with respect to the voltage (vertical axis) of the triangle wave at that time point. To start, set the scope trigger source to Channel 1, rising edge, with the level set to 0 V. You should see the rising edge of the triangle wave on channel 1 centered on the 0 time point along the horizontal axis. The rising edge of the digital output of the second inverter on channel 2 should occur at different times along the horizontal axis depending on the setting of the potentiometer, R<sub>3</sub>. Adjust R<sub>3</sub> up and down from one end of its range to the other and observe where the rising edge of the pulse on channel 2 occurs with respect to the voltage (vertical axis) of the triangle wave at that time point.
 +
 +{{ :university:courses:electronics:adjustableexternaltriggering_scopeshot1.png |}}
 +<WRAP centeralign> Figure 3: Scope Shot at oscilloscope Channel 1's rising edge trigger on different potentiometer value </WRAP>
  
 Now switch the scope trigger source to external 1 (T1 input) and repeat the sweep of R<sub>3</sub> from one end of its range to the other. You should be able to align the 0 time point anywhere along the rising edge. Now switch the scope trigger source to external 1 (T1 input) and repeat the sweep of R<sub>3</sub> from one end of its range to the other. You should be able to align the 0 time point anywhere along the rising edge.
 +
 +{{ :university:courses:electronics:adjustableexternaltriggering_scopeshot2.png |}}
 +<WRAP centeralign> Figure 4: Scope Shot at oscilloscope External Trigger's rising edge on different potentiometer value </WRAP>
  
 Now move the input of the first inverter to pin 8 of the AD8561. The 0 time point should now align with the falling edge of the input triangle wave. Again repeat the sweep of R<sub>3</sub> to confirm that you are able to align the 0 time point anywhere along the falling edge. Now move the input of the first inverter to pin 8 of the AD8561. The 0 time point should now align with the falling edge of the input triangle wave. Again repeat the sweep of R<sub>3</sub> to confirm that you are able to align the 0 time point anywhere along the falling edge.
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 The second Inverter is made by connecting pin 2 to V<sub>DD</sub>, pin 4 to V<sub>SS</sub>, pins 1 and 5 are connected together as the output and with pin 3 as the input. The third inverter is made by connecting pin 11 to V<sub>DD</sub>, pin 9 to V<sub>SS</sub>, pin 12 is the output and pin 10 is the input. The second Inverter is made by connecting pin 2 to V<sub>DD</sub>, pin 4 to V<sub>SS</sub>, pins 1 and 5 are connected together as the output and with pin 3 as the input. The third inverter is made by connecting pin 11 to V<sub>DD</sub>, pin 9 to V<sub>SS</sub>, pin 12 is the output and pin 10 is the input.
  
 +**Resources:**
 +  * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/adjust_ext_trigger_bb | adjust_ext_trigger_bb]]
  
university/courses/electronics/electronics-lab-external-trigger.txt · Last modified: 11 Feb 2021 19:14 by Ioana Chelaru

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