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| learn:instrumentation:tutorials:ad2-calibration:start [2019/07/08 18:42] – Arthur Brown | learn:instrumentation:tutorials:ad2-calibration:start [2019/07/08 18:53] (current) – removed Arthur Brown | ||
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| - | ====== Calibration ====== | ||
| - | While all Digilent Test & Measurement devices are factory calibrated, they can be recalibrated so that you can ensure that you are making the most accurate measurements possible. | ||
| - | ---- | ||
| - | ==== Inventory ==== | ||
| - | * A Digilent Test & Measurement device to be calibrated. This guide supports the following devices: | ||
| - | * [[https:// | ||
| - | * [[http:// | ||
| - | * A Mac, Windows, or Linux computer with [[http:// | ||
| - | * If WaveForms is not yet installed, please review your device' | ||
| - | * A reliable [[http:// | ||
| - | * DMM probes with grabber ends | ||
| - | * A [[http:// | ||
| - | * [[http:// | ||
| - | |||
| - | ---- | ||
| - | ====== Guide ====== | ||
| - | ==== 1. Device Manager ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | In the **Settings** menu in the bar at the top of the WaveForms window, click on **Device Manager** to open the device manager window. | ||
| - | |||
| - | Once the Device manager window opens, you can explore all of the features of the device manager. | ||
| - | |||
| - | In the top half of the window, the table contains the devices that you can use with WaveForms. If you have a device plugged in, it will appear here. | ||
| - | |||
| - | Along with the devices that are plugged in, you can also see a **DEMO** mode for each Digilent Test & Measurement device supported by WaveForms. | ||
| - | |||
| - | Demo modes allow you to see all of the features of WaveForms as if you had plugged that device in. For example, with the Demo Discovery selected, if you open the oscilloscope tool, you can see channel 1 and 2 scoping a square and sine wave. | ||
| - | |||
| - | Plug in your device so that is shows up in the device manager. If it is the only device connected, it will be the only entry in the table with a serial number. | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 2. Rename Tool ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | The first tool to explore is the rename tool. In the device manager, click on " | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | <WRAP group>< | ||
| - | For example, we named ours " | ||
| - | |||
| - | The Rename tool can be useful if you have more than one device or are collaborating in a large group where there will be multiple devices present. | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 3. Calibration Window ==== | ||
| - | |||
| - | //Next, we are going to explore the calibration feature to ensure the best possible accuracy for captured data.// | ||
| - | |||
| - | <WRAP group>< | ||
| - | In the Device Manager window, click " | ||
| - | |||
| - | The first tab you will see in the calibration window is the " | ||
| - | |||
| - | There is also the " | ||
| - | |||
| - | The Parameters and References tabs can also be seen. These are the values that define the existing calibration. It is highly recommended that you do **NOT** manually change these values. Instead, we will do a full calibration using the Calibration Wizard. | ||
| - | |||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 5. Device Calibration Wizard ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | To open the Device Calibration Wizard, click " | ||
| - | |||
| - | When the wizard opens, the start screen appears, as in the figure to the right, which tells you what you will need in order to calibrate your device. Click **Next**. | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 6. Calibrate Waveform Generator 1 ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | The first thing you'll need to do calibrate is the first waveform generator. To do this, connect the waveform generator 1 pin to your digital multimeter. | ||
| - | |||
| - | Connect the yellow wire (positive end of the waveform generator 1) from the flywire assembly to the positive side of your multimeter. Connect the negative side of the multimeter to a black wire (ground) from the flywire assembly. | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | <WRAP group>< | ||
| - | Read the value on the multimeter. As indicated by the Calibration Wizard, it should be around 0. | ||
| - | |||
| - | Enter the value you read off of the multimeter into the Calibration Wizard, and click **Next**. | ||
| - | |||
| - | Repeat this process until the Calibration Wizard indicates to move on to waveform generator 2 (10 total measurements). | ||
| - | |||
| - | **Note:** //Default values in the " | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | 0.987--- | ||
| - | ==== 7. Calibrate Waveform Generator 2 ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | Create the same circuit as before, using waveform generator 2 instead of waveform generator 1. To do this, swap out the waveform generator 1 pin (yellow cable) with the waveform generator 2 pin (yellow cable with white stripes). | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | <WRAP group>< | ||
| - | Read the value on the DMM, it should be around 0. Enter this value into the Calibration Wizard and hit **Next**. | ||
| - | |||
| - | Repeat this procedure until the Calibration Wizard indicates to move on to Oscilloscope Calibration (10 total measurements). | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 8. Zero the Oscilloscope ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | The next step in the calibration process is to zero the oscilloscope. | ||
| - | |||
| - | As indicated by the Calibration window, connect all of the oscilloscope probes to ground. | ||
| - | |||
| - | To do this, connect the positive end of channel 1 (orange cable), positive end of channel 2 (blue cable), negative end of channel 1 (orange cable with white stripes), negative end of channel 2 (blue cable with white stripes), and the ground (black cable). | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | <WRAP group>< | ||
| - | Click **Next** to start the calibration. | ||
| - | |||
| - | The oscilloscope zero calibration is automatic, so all you have to do is wait for it to finish (this may take several minutes). | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 9. Calibrate the Oscilloscope ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | The calibration we will do next will be for the oscilloscope. The first step is to set up the circuit. | ||
| - | |||
| - | Connect the positive ends of the 2 channels of the oscilloscope to waveform generator 1 (blue and orange cables), and the negative ends of the 2 channels of the oscilloscope to ground (blue and orange cables with white stripes). | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | <WRAP group>< | ||
| - | Click **Next** to start the oscilloscope calibration. This is another automatic calibration, | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | |||
| - | ---- | ||
| - | ==== 10. Calibrate the Positive Power Supply ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | The last things to calibrate are the variable power supplies, starting with the positive one. | ||
| - | |||
| - | Connect the positive supply (red cable) to the positive probe of the DMM. Connect a ground pin (black cable) to the negative probe of the DMM. | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | <WRAP group>< | ||
| - | Read the value off of the DMM and enter it into the text field. As indicated by the Calibration Wizard, it should be around 1. Click **Next**. | ||
| - | |||
| - | Continue taking and entering voltage readings until the Calibration Wizard indicates to move on to the negative power supply (two total measurements). | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 11. Connect the Negative Supply ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | Disconnect the positive supply (red cable) and replace it with the negative supply (white cable). | ||
| - | |||
| - | Repeat the same process used on the positive supply until the calibration window indicates that the negative supply has been calibrated (two total measurements). | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 12. Finished! ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | To complete the calibration, | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 13. Apply the Changes ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | In the Device Calibration window, click **Apply**, then **Yes** in the popup, to confirm the changes. | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | ---- | ||
| - | ==== 14. Compare Accuracy ==== | ||
| - | |||
| - | <WRAP group>< | ||
| - | We've hooked up the device' | ||
| - | |||
| - | In the image to the right you can see captures of the datalogger reading the 0 value with and without calibration. You can see that with calibration, | ||
| - | </ | ||
| - | {{ : | ||
| - | </ | ||
| - | |||
| - | |||
| - | ---- | ||
| - | ==== 15. If Necessary, Reset Calibration ==== | ||
| - | |||
| - | If you are ever dissatisfied with the calibration of your device, you can reset the calibration to factory settings, or reset all values to zero by using the Reset menu in the Device Calibration window. | ||
| - | |||
| - | ---- | ||
| - | ==== 16. Use Your Digilent Test and Measurement Device ==== | ||
| - | |||
| - | Now that you've gone through the calibration process, you can begin taking advantage of the many features of your Test & Measurement device. | ||
| - | |||
| - | {{ : | ||
| - | |||
| - | To read more about those features, you can view your device' | ||
| - | |||
| - | There is also an extensive collection of projects on the Digilent [[https:// | ||
| - | |||
| - | {{tag> | ||