How to alter LTspice simulation graph to show x-axis in decreasing resistance rather than increasing

[SuzanneOC]

I am modelling the voltage output of a basic circuit with respect to decreasing variable resistors. However the resistance is shown increasing(x-axis) in my graph rather than decreasing. Is there a way to alter the graph?

 

[SuzanneOC]

In fact, is there a way to plot the simulations from LTspice and edit axes, units, title etc? For inclusion in a report.

 

[MikeMl]

Why do you care about reversing the X-axis? The information you asked the simulator to get you is all in the plot.

Here is a much better way of presenting the plotted data: Note how I modified the .STEP command to make the simulation run 50x faster than yours. Note how much easier it is to read the log plot.

I took some liberties with your circuit, trying to figure out what you actually wanted to do. I didn't understand R5/R6 in your circuit.

Did you really need to connect a 1KΩ resistor R1 in-series with a voltage source that already has a 1KΩ internal resistance?

 

[eTech]

Hi

I agree with MikeML, however...

If you really want to show a decreasing value you can change the horizontal axis "Quantity Value" from R to -R
But the quantity will be shown as a negative value.

 

[crutschow]

In fact, is there a way to plot the simulations from LTspice and edit axes, units, title etc? For inclusion in a report.

You can modify axis increments and values by left-clicking he desired parameter axis on the graph.
You can add graph annotations by clicking on Notes and Annotations under the Plot Settings Tab.

 

[SuzanneOC]

You can modify axis increments and values by left-clicking he desired parameter axis on the graph.
You can add graph annotations by clicking on Notes and Annotations under the Plot Settings Tab.

Yes, i tried that also but it wont look right in a report.

Is there a way to export the simulated data to excel for plotting against another parameter?
For instance, from this simulation I would like to take the output voltage values and plot them against a non-electrical parameter.

Is it possible to export data from LTspice?

 

[MikeMl]

...

Is it possible to export data from LTspice?

Google is your friend. So is reading LTSpice's help file...

 

[eTech]

Here's another way to plot the result.

I've modifed the R value calculation to help convergence.
Notice I've change the analysis to .tran and added a .meas statement.

There are some other mods but I'll let you review the schematic I posted.

Anyway, Run the simulation (it takes about 5 minutes to complete).
After it completes:
1. View->Spice error log.
2. Rht-clk the any of the ".step r=nnn" row entries
3. select "Plot .step'ed .meas data" from the pop-up menu.
a new graph will appear
4. Rht-clk in the new graph
5. Select "Visible Traces"
6. Select "Out"from the pop-up menu, to add the Out measurement to the graph
The Output should now be shown in the graph.

After doing step 6, the new graph should show a decreasing R value in the horizontal axis and the Output voltage in the vertical axis.

See attached.