Using the Cursors

The cursors can be used to obtain numerical values from traces. To display the cursors, click the cursor button as shown below  

After clicking the button, the cursors will be displayed  

The cursors are positioned at the leftmost data point of the first trace so they cannot be easily seen. A new dialog box is displayed on the Probe screen. This dialog box displays the coordinates of each cursor and the difference between the two cursors. (There are two cursors.) 

Difference between coordinate values of cursor 1 and cursor 2. 

For this example and any other examples that use the cursors, the numerical values of the coordinates of your cursors may be slightly different than those shown in the examples since the points you choose may be different than those chosen in the examples. 

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A menu system was designed for screen presentation. Keywords in the main menu are activated using the cursor keys or the first letter in the keyword. They are then displayed in a highlighted format, and a question connected with their usage is displayed in an accompanying line. The main menu choices are Chemical, Task, Attributes, Search, Match, Options, Print, and Quit. 

Using the cursors to locate the maximum, we see that the maximum power to the load occurs when the load is 1000 Q, equal to the source resistance ... 

SDLUTIOIl Sweep 1 1 from -15 V to +15 V as in the previous example. Plot the voltage at node VL and use the cursors to mark the inflection points ... 

Suppose we wanted to show the values of VIL) VIH, V0L, and V0H on the Probe screen. This can be done using the cursors. Rrst, select Window from the menus and then select the first plot we generated to display a trace of V(Vo) by itself on the Probe window ... 

We see that the 2N3904 BJT has a maximum DC current gain at a collector current of about 10 mA. Use the cursors and label the maximum value of current gain ... 

We have specified a linear sweep from -25°C to 125°C with 1-degree increments. Click the OK button to the schematic. Simulate the circuit and display the results with Probe. Add the trace IC (Q1) to plot the collector current. Use the cursors to label the end points of the range. 

We will now run the same temperature sweep that we did in the previous section. Plot IC(Q1) and use the cursors to label the values at the end points of the trace. 

We can now use the cursors to find the 3 dB frequency. (See Section 2.K for a full explanation of cursors.) To display the cursors, select Trace, Cursor, and then Display from the Probe menus. The cursors will appear ... 

EXERCISE 5-V. Plot the Bode phase and magnitude plots for frequencies from 1 Hz to 1 MHz. Use the cursors to find the ... 

Run the PSpice simulation Select PSpice and then Run from the Capture menu bar. When the simulation is complete, the Probe window will open. Add the trace DB(V(VO) ) to plot the gain in decibels. Use the cursors to label the mid-band gain, and upper and lower -3 dB frequencies. Your cursor values may be slightly different than those shown here. 

This plot shows us that the gain of the amplifier is 30. If we wish to find the 3 dB frequency for this amplifier, we must display the trace in dB. We will add a second window to display the new trace. Select Window and then New Window to open a new window and then add the trace DB (V (VO)). Use the cursors to locate the -3 dB frequency ... 

We see that the input voltage signal contains only one frequency at 1 kHz. Since the signal source was a 1 kHz signal it should contain only one frequency. If you look at the schematic, you will remember that the amplitude of Vin was a 45 mV amplitude sine wave. We can use the cursors to find the value of the frequency component at 1 kHz ... 

Notice that the largest frequency component contained in the output is at the fundamental (1 kHz), but there is also a large component at the second harmonic (2 kHz). There are other frequencies contained in the output, but they are too small to be seen on the graph. Using the cursors we find that the magnitude of the component at 1 kHz is 7.4665 V, and the magnitude of the component at 2 kHz is 1.3958 V. 

We will zoom in on the Vo trace to see it more closely. Use the cursors to find the magnitude of the ripple. 

Three traces are shown, one for each temperature. The result shows that temperature does not have too much of an effect on the input voltage. Remove the trace and plot the output voltage. Zoom in on the traces and use the cursors to display the magnitude of the ripple. 

A data management system is an integral part of the program. This allows the operator to store experimental data on the computer s disks and to reanalyze stored data, or to simply review results without reanalysis. Using the cursor controls, the operator can select stored runs from the menu and print the results for those runs in tabular form. Selected runs can be deleted in a similar fashion. 

Select < UNIFAC-FV Method >. (To select an item from any menu screen, you can use the cursor keys to highlight the item and press ENTER or simply type the first letter of the item.)... 

First, BASIC 7.0 includes a simple sprite editor. Just type SPRDEF, and a box appears on the screen. Enter which sprite you d like to define, then use the cursor keys and the number keys 1-4 to draw squares on the grid. When you re through, the sprite is stored into a reserved section of memory. This memory can be saved to disk with BSAVE, then recalled within your program with BLOAD, eliminating the need for DATA statements. 

This limit on line length means it s a good idea to press RETURN only when you re editing a line. To move around the screen, use the cursor keys (or SHIFT-RETURN, which does not enter the line in program memory and is also a way to get out of quote mode). 

You can use the cursor keys (up, down, left, right) to move the large red cursor to any character you want to edit. If you move to a character not on the large grid (out of the window), the window automatically scrolls to make the character appear. You can also look at the bottom of the screen to move the larger cursor, since the flashing square on the character set moves with the main grid. 

Although a mouse can be used with the program, the default is to use the cursor keys to move around the screen. When the desired menu item is highlighted, press ENTER to select it. You can also select menu items by typing the first letter of the desired item. Below is the result of choosing the File menu. 

The signal-to-noise ratio is a measure of the quality of a peak. The signal is determined by measuring the size of a peak, which can easily be done using the cursor in the software program used to display the spectrum. In Figure 1.8 the size of the peak is 0.0215 absorbance units. Noise is error, in this case in the y-axis of a spectrum. 

When a semicolon is used in the print statement, the cursor on the screen will not move to a new line and will not advance. Subsequent printing continues immediately after the last item printed. When a comma is used, the cursor will not move to a new line but will advance to the next tab stop which can be set with dep tab. The default is usually about 5 spaces. A print statement alone causes the cursor to advance to a new line. For example,... 

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