Frequency Plotter


The frequency plotter measures a circuit’s frequency response and displays its measurements in a small graph.

The Input/Output tab allows you to set up the test in regards to the circuit. Under this tab, choose two nodes in a B2 A/D Spice circuit or an input part. (Behind the scenes, the Sweep instrument adds a voltage source to the circuit or if there is already a voltage source connected to the node and ground, it takes over its settings.) You should also choose two output nodes. Then select a Signal Amplitude and you are ready to run the test.

Set up the sweep for the test under the Sweep tab. Here you can set whether the graph’s display should reflect a logarithmic or linear labeling of frequency. Select a starting and ending frequency and the number of steps per interval for the test to run.
Set up the graph under the Graph Settings tab. Here you can control the graph's display of both the amplitude and the phase across the frequency sweep’s range. The Y-axis settings are the maximum and minimum limits of the graphs display, with the option to set the graph display to linear or in dB. Pressing the “Auto” button overrides the fixed Y-axis tick makings and it auto adjusts the graph’s Y-axis limits to twice the highest current reading it sees. The X-axis settings are the beginning and ending frequencies.
The last tab, Export, allows you to export the graph to various formats, including graphic files, text tables, or even copy it to the Project's graph window. You can even copy the graph into memory to paste into other applications.

Pressing the “Setup” button toggles the length of the Sweep meter, so that when its setup is complete, the sweep meter becomes only as tall as its display band. Press the Amplitude/Phase to switch between the two modes. Press the "Run Sweep" button to proceed with the test.
Pressing the “Zoom” button brings up a new window with just the graph portion of the small frequency sweep instrument.