![]() ![]() ![]() Using Multipurpose Knob a, the appropriate analog or reference channel can be selected and chosen by pressing the soft key associated with Enter Selection. The next menu selection is Advanced Math. A close-up view of the MDO3104 main front panel. The same signal is shown in two domains as opposed to in an MSO or mixed-signal oscilloscope, where separate signals from different analog or reference channels are displayed together. In an MDO instrument, they are shown in split-screen format, which is why the instrument is known as a mixed-domain oscilloscope. Notice that the original analog or reference waveform is shown in the time domain along with the frequency domain display. Then press Menu Off to get a clear view of the display. It is selected merely by turning Multipurpose Knob a. For this transform, only a single input is used, one of the four analog channel inputs or one of the four reference channels. Pressing the associated soft key brings up the vertical FFT menu. The next selection in the horizontal math menu is the very frequently used FFT. Accordingly, the math operations can be and are performed. It just happens to have a zero-volt amplitude. Notice that if there is no probe or BNC cable connnected to an analog input channel, there is still a signal/waveform present. ![]() Instantly, the math waveform appears, in its dedicated red color. The operator, add, subtract, multiply or divide, may be chosen by toggling the associated soft key. These are labeled First Source and Second Source, and may be chosen by turning the aptly-named Multipurpose Knobs a and b. Dual Waveform Math, as its name implies, performs any of the four basic arithmetic operations - add, subtract, multiply and divide - on any of two waveforms that are present at the analog inputs or reference channels. If the soft key that is directly below Dual Waveform Math is pressed, the applicable vertical submenu appears to the right of the display, each item, in turn, having an associated soft key. Each of these selections has an associated soft key directly below it. The available menu selections are Dual Waveform Math, FFT, Advanced Math, Label and Auto-Scale. For example, if the Math button has been pressed while one or more of the analog input channels is active, the Math menu appears across the bottom of the display. The menu system consists of a front-panel menu button that, when pressed, displays a menu for the desired function. Here is a survey of those in a typical contemporary instrument: Modern-day Tektronix MDO3104 flat screen oscilloscope. Most major digital storage oscilloscope models have similar controls. Many of the buttons have diverse functions as well, or serve only to open a menu that appears across the bottom of the display.Ī row of soft keys (this is industry-wide terminology) activate menu selections, which vary depending upon the operation that has been chosen by the user. It typically employs multipurpose knobs that are contextual, performing multiple tasks depending on the menu item that is active. Our contemporary digital oscilloscope has far fewer front-panel controls. In the modern digital instrument with a flat screen, there is no focus knob, as required for the CRT with its beam of electrons traveling the length of the tube. Early analog oscilloscopes had a vast number of front panel controls, mostly knobs that had to be endlessly twirled and tweaked to obtain and maintain stable waveforms on the screen. ![]()
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