Spectrum Analyzer
Spectrum Analyzer Control Panel Overview
SCPI, Storage, and Generators Controls
Button | Function | Button | Function |
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Open file explorer to load a file with extension .txt with SCPI scripts. | Begins the recording of SCPI commands based on the actions performed by the user on the oscilloscope interface. | ||
Ends SCPI command recording. | Saves the recorded SCPI script with the user defined name. | ||
Takes a screenshot and saves it on the internal storage or in external USB flash drive. | It generates a file with a .csv extension with the wave information on the screen, it is saved in the internal storage or in an external USB flash drive. | ||
Displays the Spectrum Analyzer configuration menu (Figure -). | Changes the control panel to the spectrum analyzer control panel. | ||
Changes the control panel to the arbitrary waveform generator control panel, the option is only available if the arbitrary waveform generator is selected from the main menu. | Changes the control panel to the radio frequency generator control panel, the option is only available if the radio frequency generator is selected from the main menu. |
System Panel
System Panel | Button | Function | Button | Function |
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Resets the Spectrum Analyzer to their default values (Table -) | some text here | |||
some text here |
Markers and Display Menu
Markers and Display Menu | Button | Function | Button | Function |
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Displays the menu to activate markers . | Displays the marker options menu where the center frequency, start frequency, stop frequency and reference level are configured as the values currently read by the active marker. | |||
some text here | Deploys the display options menu where the type of representation and the color map can be configured. | |||
Positions the selected marker at the highest peak of the measured spectrum. | Positions the selected marker on the closest peak to its right. | |||
Positions the selected marker on the closest peak to its left. | Some text here |
Mode Panel
Mode Panel | Button | Function | Button | Function |
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Activates the bandwidth value configuration using knobs or arrows. | Some text here | |||
some text here | Activates the Measurement configuration | |||
Some text here | Some text here |
Frequency and Amplitude Panel
Frequency and Amplitude Panel | Button | Function | Button | Function |
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Displays the menu for setting the center frequency , stop frequency and start frequency. | Displays the span options menu , with the options to configure the frequency of span, full span, zero span ans last span. | |||
Displays the amplitude options menu , with the options to configure the reference level, attenuation, amplitude unit, amplitude scale, and reference offset. |
Universal Knob and Arrows
Universal Knob and Arrows | Button | Function | Button | Function |
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Increase or decrease any active numeric value on screen. | Both have the same function than the universal knob, Increase or decrease any active numeric value on screen. | |||
Both have the same function than the universal knob, Increase or decrease any active numeric value on screen. | Change the granularity steps between fine (yellow button) and coarse (gray button). |
Numeric Keypad
Enter the numerical value in the active configuration parameter on the screen. |
Units Keypad
Units Keypad | Button | Function | Button | Function |
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Gives the unit of Gigahertz to the entered numeric value. | Gives a unit of volts to the entered value. | |||
Gives the unit of megahertz to the entered numeric value. (Only if the parameter is frequency). | Gives a unit of millivolts to the entered value. | |||
Gives the unit of kilohertz to the entered numeric value. (Only if the parameter is frequency). | Gives a unit of decibels to the entered value. | |||
Gives the unit of Hertz to the entered numeric value. (Only if the parameter is frequency). | Sets a decibel-microvolt unit to the entered value. | |||
Gives the unit of millihertz to the entered numeric value. (Only if the parameter is frequency). | Returns the decibel-millivolt unit to the entered numeric value. |
Channel Buttons
Channel Buttons | Button | Function | Button | Function |
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Turns on, off and / or selects channel 1 output. | Turns on, off and / or selects channel 2 output. | |||
Turns on, off and / or selects channel 3 output. | Turns on, off and / or selects channel 4 output. |
Spectrum Analyzer Functions
To Set Channels
Frequency
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Center Frequency
The center frequency corresponds to the frequency located in the center of the frequency range shown in the spectrum analyzer, for that, this value will be the center of the horizontal axis where the measured spectrum is displayed. Normally the center frequency value is set to the same frequency value where the maximum peak of the spectrum is expected to be found. The center frequency value can vary with the start frequency and stop frequency values. When either of these two values is changed, the center frequency will change, to the limits match with the span frequency.
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Start Frequency
The start frequency corresponds to the first visible frequency in the frequency range displayed by the Spectrum Analyzer. This variable is set to the frequency value from which you want to start viewing the measured spectrum. The value of start frequency can vary depending of the span frequency and center frequency. Changing the value of any of these two variables, the value of start frequency will be recalculated based on the new value of the center or span frequency.
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Stop Frequency
Span Frequency
Amplitude
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Reference Level
Corresponds to the reference value in amplitude for the spectrum analyzer, that is, the maximum value of amplitude that will be shown on the vertical axis, this value is partially adjusted to be able to see the maximum power peak in the spectrum. This variable is adjusted by pressing the button in the amplitude menu, then the amplitude variable indicator will change to the name of the selected variable and the value can be edited using the numeric keypad and the units keypad, as the value changes the amplitude variable indicator is updated.
Attenuation
Amplitude Unit
Amplitude Scale
It corresponds to the separation between each of the values shown in each division of the vertical amplitude grid, that is, it defines the amplitude steps shown on the vertical axis. To adjust the amplitude scale value, press the button in the amplitude menu, then the amplitude variable indicator will change to the name of the selected variable and the value can be edited using the numeric keypad and the units keypad, as the value changes the amplitude variable indicator is updated.
Reference Offset
Span
To make changes to the span frequency, press the button . Next, in the menu view, four options will be displayed: Span, Full span, Zero span and Last span, each of which will serve to configure the value of the span frequency as explained below.
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Bandwidth
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- Resolution Bandwidth:
To adjust the Resolution Bandwidth of the spectrum displayed on the screen, press the button in the bandwidth menu. Then, the Resolution Bandwidth value can be adjusted using the numeric keypad and the units keypad or through the knob and arrows.
- Video Bandwidth:
- Video Bandwidth / Resolution Bandwidth Ratio:
Measurement
Press the Measure Button on the mode panel will open the Measure Softmenu on the right side of the screen with different measurement options.
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Spectrum Mask Template For creating a Spectrum Mask template select the Spectrum Mask submenu
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Spectrum Mask Softmenu After pressing the Measure Spectrum mask options the Spectrum Mask Softmenu will appear on the right side of the screen. For creating a template, press the option Create template.
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Create Template After pressing the Create Template option, you will be able to click on the screen and automatically a point will appear and each point you create touching on the screen will be interpolated to crate a template. The Frequency and Power value of each point will appear in the table on the right side of the screen. After finishing of creating the template press done to detect if there is a violation on the Spectrum or not, or you can press clear template to clear the template and create a new one.
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After pressing the done button, if there is a violation, the spectrum color will change to red, If not the spectrum color will keep at the same after creating the Spectrum Mask template.
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Edit Template At the Spectrum Mask softmenu you can choose the Edit Template options to edit the points of the created template, you can edit the power and the frequency for each points in the table on the right side and the template will change the shape automatically.
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In the Spectrum Mask edition mode, it is possible to click under a point of the template and its corresponding point of the table will be selected in the edition table as the Figure 6 shows. When finishing the edition of the frequency or Power Value, remember to click on a different point edit box for applying the change in the template.
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Load and Save Template In addition, on the Spectrum Mask Soft menu, you can Save and Load templates. When you press the save options, 4 slots to save the current template will be available. The template will be saved in the selected slot and pressing the load button, you can load the template saved from any of these slots.
To Set Markers
Spectrum analyzer markers enable more detailed analysis of specific frequency and amplitude points in the measured spectrum. To activate the markers within the spectrum, press the button on the markers and display menu, then the markers menu will be displayed in the sofmenu view, where the five available markers and the option to activate the marker table will appear at the bottom of the graph. To activate any of the markers, press the button corresponding to the marker to be activated in the markers menu, the marker will automatically appear on the graph and its position in frequency and amplitude will be shown in the table of active markers.
When a marker is activated, it can be repositioned throughout the measured spectrum, using the arrows to move it to the desired position.
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Marker To
Among the functions available for markers is the Marker To function, which adjusts the value of the Center Frequency, Start Frequency, Stop Frequency, or Amplitude Reference, based on the current value of frequency or amplitude of the active marker. For example, if marker 2 is the active marker and is in 5MHz frequency position and 20dBuV amplitude, pressing the Marker to - Marker CF option will automatically switch the center frequency to the marker 2 frequency position (5MHz), which is the currently active marker.
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- Marker To Center:
Changes the center frequency to the frequency value of the active marker. To perform this action, press the button in the Marker To menu.
- Marker To Start:
Changes the start frequency value for the frequency value of the active marker. To perform this action, press the button in the Marker To menu.
- Marker To Stop:
Changes the stop frequency value for the frequency value of the active marker. To perform this action, press the button in the Marker To menu.
- Marker To Amplitude Reference:
Change the amplitude reference value to the amplitude value where the active marker is located. To perform this action, press the button in the Marker To menu.
Marker Table
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Peak
To place the selected marker over the highest peak of the measured spectrum, press the button which is located on the marker and display panel. The marker will then reposition itself, displaying the frequency and amplitude values corresponding to the highest peak.
Right Peak
To position the selected marker on the peak closest to the right, press the button which is located on the marker and display panel. The marker will then reposition itself, displaying the frequency and amplitude values corresponding to the closest peak to the right.
Left Peak
To position the selected marker on the peak closest to the left, press the button which is located on the marker and display panel. The marker will then reposition itself, displaying the frequency and amplitude values corresponding to the closest peak to the left.
Display
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To Set Representation
The representation property allows changing the way the spectrum is displayed, to access it, press the button which is located in the display submenu. Next, a menu will be displayed in which you can choose between four display options: 2D, 3D, analog, and waterfall spectrogram.
2D: To select the two-dimensional display option, press the button at represent menu. An example of the 2D display of the measured spectrum is shown in the following image.
3D: To select the three-dimensional display option, press the button at represent menu. An example of the 3D display of the measured spectrum is shown in the following image.
Analog: To select the analog display option, press the button at represent menu. An example of the analog display of the measured spectrum is shown in the following image.
Waterfall Spectrogram: To select the waterfall spectrogram display option, press the button at represent menu. An example of the waterfall spectrogram display of the measured spectrum is shown in the following image.
To Set Memory Depth
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To Set Color Map
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To Set Granularity
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To Set Arbitrary Waveform Generator Panel
When the arbitrary waveform generator is selected from the main menu, upon entering the spectrum analyzer a tab will appear at the top of the control panel . If the arbitrary waveform generator is not selected in the main menu, the tab will not appear on the spectrum analyzer.
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To Set RF Generator Panel
When the RF generator is selected from the main menu, upon entering the spectrum analyzer a tab will appear at the top of the control panel . If the RF generator is not selected in the main menu, the tab will not appear on the spectrum analyzer.
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Preset the Spectrum Analyzer
The preset returns all the Spectrum Analyzer variables to their default values. Which are listed in the next table. To make the preset on the Spectrum Analyzer, press the button in the system panel. All the Spectrum Analyzer variables will automatically change to their default value.
Variable | Value |
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Channel 1 State | ON |
Channel 2 State | ON |
Channel 3 State | OFF |
Channel 4 State | OFF |
Center Frequency | 5 MHz |
Span Frequency | 100 MHz |
Amplitude Scale | 10 dB/div |
Amplitude Reference | 110.0 dBµV |
Marker 1 | Position: 0 Hz State: OFF |
Marker 2 | Position: 0 Hz State: OFF |
Marker 3 | Position: 0 Hz State: OFF |
Marker 4 | Position: 0 Hz State: OFF |
Display Representation | Analog |
Display Memory | 16 K |
Display Color Map | Yellow |
Save and Load States
Implemented, but pending restructuring.
Taking and Saving a Screenshot
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Save a .csv File
The .csv file option allows you to generate and save a file with a .csv extension where each of the time samples and their corresponding power and frequency value are stored for each of the channels that are turned on at the time of generating the file. This file can be opened and graphed in programs like Excel and Matlab.
1 | .csv save file window. |