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university:tools:m2k:scopy:spectrumanalyzer [19 Oct 2017 08:49] – Added description on different averaging types Dann Kristofer Bautista | university:tools:m2k:scopy:spectrumanalyzer [07 Apr 2021 22:11] (current) – adding video Brandon Bushey | ||
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====== Scopy Spectrum Analyzer ====== | ====== Scopy Spectrum Analyzer ====== | ||
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+ | ===== Video ===== | ||
+ | {{youtube> | ||
===== General Description ===== | ===== General Description ===== | ||
The Spectrum Analyzer instrument captures the signal in frequency domain where the signals are displayed as a function of their frequency. | The Spectrum Analyzer instrument captures the signal in frequency domain where the signals are displayed as a function of their frequency. | ||
- | The M2K’s Spectrum Analyzer makes use of probes 1 and 2 which are capable of measuring signals at ±20V. | + | The M2K’s Spectrum Analyzer makes use of probes 1 and 2 which are capable of measuring signals at ±25V. |
<WRAP round info 65%>A Calibration feature automatically starts for the Spectrum Analyzer instrument when Scopy connects to an M2k device.</ | <WRAP round info 65%>A Calibration feature automatically starts for the Spectrum Analyzer instrument when Scopy connects to an M2k device.</ | ||
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==== Spectrum Analyzer Front Panel ==== | ==== Spectrum Analyzer Front Panel ==== | ||
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- **Spectrum Analyzer Tab**: Clicking this tab brings out the Spectrum Analyzer instrument in front. The white box will allow the user to run/stop the Spectrum Analyzer while other instrument tab is open. | - **Spectrum Analyzer Tab**: Clicking this tab brings out the Spectrum Analyzer instrument in front. The white box will allow the user to run/stop the Spectrum Analyzer while other instrument tab is open. | ||
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- **Markers**: | - **Markers**: | ||
- **Run/Stop and Single Run**: Clicking the Run button will allow the spectrum analyzer to continuously capture data. Clicking the Single button will allow the spectrum analyzer the capture the data once. | - **Run/Stop and Single Run**: Clicking the Run button will allow the spectrum analyzer to continuously capture data. Clicking the Single button will allow the spectrum analyzer the capture the data once. | ||
+ | - **Instrument Settings**: Clicking the instrument settings button will show the instrument settings panel. | ||
+ | - **Last opened panel**: Clicking this button will bring out the last opened panel. | ||
+ | - **Acquisition status**: Displays the percentage of acquired samples and the total number. | ||
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==== Channel Settings ==== | ==== Channel Settings ==== | ||
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- **Type**: The options available in the drop down menu are the several types of averaging available in Scopy’s Spectrum Analyzer. This will improve the accuracy and repeatability of measurements. The summary of the averaging types are written below. | - **Type**: The options available in the drop down menu are the several types of averaging available in Scopy’s Spectrum Analyzer. This will improve the accuracy and repeatability of measurements. The summary of the averaging types are written below. | ||
- **Window**: Determines the type of FFT computation to be used. \\ | - **Window**: Determines the type of FFT computation to be used. \\ | ||
- | - **Averaging | + | - **CH Thickness |
+ | - **Gain mode**: Change the gain mode for each channel. Available options are " | ||
+ | - **Snapshot button**: Create a snapshot of the current channel and add it as a reference channel (see screenshot attached below). \\ | ||
Here’s a brief suggestion of the window functions based on the input signal: | Here’s a brief suggestion of the window functions based on the input signal: | ||
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| Narrowband random signal (vibration data) | Hann | | | Narrowband random signal (vibration data) | Hann | | ||
|Unknown content | Hann | | |Unknown content | Hann | | ||
- | For the description of the __window function__ | + | For the description of the __Window Function__ |
< | < | ||
{{ : | {{ : | ||
- | * Hanning: The most commonly used window. It has an amplitude variation about 1.5dB for signals between bins and provides reasonable selectivity. Its filter roll off is not particularly steep. Hanning windows can limit the performance of the analyzer when looking at signals close together in frequency with very different amplitude. | + | |
- | * Flattop: The Flattop window improves on the amplitude accuracy of the Hanning window. Its between-bin amplitude variation is about 0.02 dB. However, the selectivity is a little worse. Unlike the Hanning, the Flattop window has a wide pass band and very steep rolloff on either side. Thus, signals appear wide but do not leak across the whole spectrum. | + | |
- | * Blackman-Harris: | + | |
- | * Kaiser : The Kaiser window, combines excellent selectivity and reasonable accuracy. The Kaiser window has the lowest side-lobes and the least broadening for non-bin frequencies. Because of these properties, it is the best window to use for measurements requiring a large dynamic range. | + | |
Visit [[https:// | Visit [[https:// | ||
</ | </ | ||
- | For the description of the __averaging types__ | + | For the description of the __Averaging Types__ |
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{{ : | {{ : | ||
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+ | ---- | ||
+ | ==== Averaging ==== | ||
+ | {{ : | ||
+ | - **Averaging**: | ||
+ | \\ | ||
+ | |||
+ | {{ : | ||
+ | - **Averaging status**: Display how many samples were processed from the maximum set averaging amount. | ||
+ | - **Averaging**: | ||
+ | - **History button**: Turn average history on/off (this affects the way the average is being processed and it is available only for the following average types: Linear RMS and Linear DB). | ||
+ | |||
+ | The average value can be set to maximum 1000 for the following average types: Peak Hold, Min Hold, Linear RMS and Linear DB. \\ | ||
+ | The average value can be set to maximum 1000000 for the following average types: Peak Hold Continuous, Min Hold Continuous, Exponential RMS, Exponential DB. \\ | ||
+ | For Linear RMS and Linear DB the maximum average value is influenced by the History button. \\ | ||
+ | If the History button is ON, the maximum value is 1000. \\ | ||
+ | If the History button is OFF, the maximum value is 1000000. \\ | ||
+ | \\ | ||
+ | ---- | ||
+ | ---- | ||
+ | ==== Snapshot ==== | ||
+ | {{ : | ||
+ | |||
+ | \\ | ||
+ | ---- | ||
+ | ==== General Settings ==== | ||
+ | {{ : | ||
+ | |||
+ | \\ | ||
+ | General settings contains the export data button. | ||
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==== Sweep Setting ==== | ==== Sweep Setting ==== | ||
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- | {{ : | + | {{ : |
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Sweep menu allows the user to make changes on the Spectrum Analyzer’s signal plot window depending on the desired frequency to be analyzed. All the changes made applies to both channels. | Sweep menu allows the user to make changes on the Spectrum Analyzer’s signal plot window depending on the desired frequency to be analyzed. All the changes made applies to both channels. | ||
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- **Sweep menu button**: This button will bring out the sweep setting. | - **Sweep menu button**: This button will bring out the sweep setting. | ||
+ | - **Logarithmic/ | ||
- **Start and Stop Frequency**: | - **Start and Stop Frequency**: | ||
- **Center Frequency**: | - **Center Frequency**: | ||
- **Span**: Sets the spectrum span to be analyzed from 0 Hz to 50MHz. | - **Span**: Sets the spectrum span to be analyzed from 0 Hz to 50MHz. | ||
+ | - **Top, bottom, scale/ | ||
+ | - **Units**: Sets the amplitude unit to _dBFS, dBu, dBV, Vpeak, Vrms and V/√Hz. | ||
- **Resolution Bandwidth**: | - **Resolution Bandwidth**: | ||
- | - **Units**: Sets the amplitude unit to _dBFS, dBu, dBV, Vpeak and Vrms_. | ||
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==== Markers ==== | ==== Markers ==== | ||
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- | {{ : | + | {{ : |
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Markers allow the user to measure the amplitude on a specific frequency. Scopy allows the user to have multiple markers on each channel. The marker controls makes it flexible enough for quick spectrum measurement. | Markers allow the user to measure the amplitude on a specific frequency. Scopy allows the user to have multiple markers on each channel. The marker controls makes it flexible enough for quick spectrum measurement. |