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test-and-measurement:analog-discovery-pro-5250:power-measurement-demo [2021/09/25 15:35] – Keith M Kolmos | test-and-measurement:analog-discovery-pro-5250:power-measurement-demo [2022/02/21 23:21] – [Inventory] link to analog parts kit Arthur Brown | ||
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====== Power Measurement with the Analog Discovery Pro (ADP5250) ====== | ====== Power Measurement with the Analog Discovery Pro (ADP5250) ====== | ||
~~TechArticle~~ | ~~TechArticle~~ | ||
- | {{: | + | {{ : |
===== Overview ===== | ===== Overview ===== | ||
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---- | ---- | ||
===== Inventory ===== | ===== Inventory ===== | ||
- | * Analog Discovery Pro with: | + | * Analog Discovery Pro (ADP5250) |
* 2 BNC oscilloscope probes | * 2 BNC oscilloscope probes | ||
* A BNC to minigrabber clip cable | * A BNC to minigrabber clip cable | ||
- | * Analog parts and wires (found in the Analog Parts Kit): | + | * Analog parts and wires (found in the [[https:// |
* A 470 Ω resistor | * A 470 Ω resistor | ||
* A 4.7 nF capacitor | * A 4.7 nF capacitor | ||
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<WRAP column half> | <WRAP column half> | ||
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- | {{reference: | + | {{: |
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<WRAP column half> | <WRAP column half> | ||
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<WRAP group> | <WRAP group> | ||
<WRAP column half> | <WRAP column half> | ||
- | **Open** the //Scope// instrument. Enable Channels 1, 2, and 3 and adjust the ranges to match the image to the right. Adjust the ranges of each channel to 5 mV/div, 1 V/ | + | **Open** the //Scope// instrument. Enable Channels 1 and 2, then adjust the ranges to match the image to the right. Adjust the ranges of each channel to 5 mV/div and 1 V/div respectively, |
Clicking the " | Clicking the " | ||
</ | </ | ||
<WRAP column half> | <WRAP column half> | ||
- | {{reference: | + | {{: |
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Without leaving the //Scope// instrument, **Run** All Instruments by clicking the button in the upper right corner of WaveForms, which will start the //Wavegen// and the //Scope// instruments at the same time. | Without leaving the //Scope// instrument, **Run** All Instruments by clicking the button in the upper right corner of WaveForms, which will start the //Wavegen// and the //Scope// instruments at the same time. | ||
- | What should be seen at this stage, is the voltage drop across the sensing resistor (Ch 1), the voltage drop across the entire circuit (Ch 2), and the voltage drop across the two resistors (Ch 3), as seen in the image to the right. The current across each component can be calculated using the Scope' | + | What should be seen at this stage, is the voltage drop across the sensing resistor (Ch 1), the voltage drop across the entire circuit (Ch 2 position 1), and the voltage drop across the two resistors (Ch 2 position 2), as seen in the image to the right. |
</ | </ | ||
<WRAP column half> | <WRAP column half> | ||
- | {{reference: | + | {{: |
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</ | </ | ||
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</ | </ | ||
<WRAP column half> | <WRAP column half> | ||
- | {{reference: | + | {{: |
</ | </ | ||
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<WRAP group> | <WRAP group> | ||
<WRAP column half> | <WRAP column half> | ||
- | The power across the resistor can be calculated as well. To do so, the voltage across the sensing resistor is subtracted from the voltage across both resistors (Channel | + | The power across the resistor can be calculated as well. To do so, the voltage across the sensing resistor is subtracted from the voltage across both resistors (Channel |
- | **Add** another Math channel, this time with the calculation of "(C3-C1)*C1/ | + | **Add** another Math channel, this time with the calculation of "(C2-C1)*C1/ |
Note: Scope measurement and math channels can be renamed and relabeled in order to clarify what they represent. This can be done by expanding the channel options (the gear icon) and editing the Name and Label properties of the channel. | Note: Scope measurement and math channels can be renamed and relabeled in order to clarify what they represent. This can be done by expanding the channel options (the gear icon) and editing the Name and Label properties of the channel. | ||
</ | </ | ||
<WRAP column half> | <WRAP column half> | ||
- | {{reference: | + | {{: |
- | </ | + | |
- | </ | + | |
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- | <WRAP group> | + | |
- | <WRAP column half> | + | |
- | The capacitor power can also be calculated, by subtracting the voltage across both resistors from the total voltage across the circuit and multiplying the result by the current passing through the circuit. | + | |
- | + | ||
- | **Add** one last Math channel with the calculation "(C2 - C3)*C1/ | + | |
- | </ | + | |
- | <WRAP column half> | + | |
- | {{reference: | + | |
- | </ | + | |
- | </ | + | |
- | + | ||
- | <WRAP group> | + | |
- | <WRAP column half> | + | |
- | Math3 is noisy but by averaging the signals across multiple measurements this can be reduced. To do so, expand the " | + | |
- | </ | + | |
- | <WRAP column half> | + | |
- | {{reference: | + | |
</ | </ | ||
</ | </ | ||
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<WRAP group> | <WRAP group> | ||
<WRAP column half> | <WRAP column half> | ||
- | To see the average value of each power measurement, | + | To see the average value of each power measurement, |
</ | </ | ||
<WRAP column half> | <WRAP column half> | ||
- | {{reference: | + | {{: |
</ | </ | ||
</ | </ | ||
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</ | </ | ||
<WRAP column half> | <WRAP column half> | ||
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===== Other Resources ===== | ===== Other Resources ===== | ||
- | For more guides and example projects for your Analog Discovery Pro, please visit its [[start|Resource Center]]. | + | For more guides and example projects for your Analog Discovery Pro (ADP5250), please visit its [[start|Resource Center]]. |
For technical support, please visit the [[https:// | For technical support, please visit the [[https:// | ||