How do I correct this error: "spectrum cannot be displayed for continuous or infinite times"

I draw rf energy harvesting circuit for my project in simscape electrical and connected a scope to the circuit for display. When I run the simulation, a blank page displays saying "spectrum cannot be displayed for continuous or infinite times". Fiind attached snip cut of the rf circuit and the displayed error screen.

How do I please solve this issue?

[Stephen23]

An AI tool that I asked gave this advice:

This error occurs when you're trying to view the frequency spectrum of a signal in a scope, but your simulation is set up for continuous time or runs indefinitely. Here are the solutions:Quick Fixes1. Set a Finite Stop Time

The most common solution:

• Go to Simulation → Model Configuration Parameters (or press Ctrl+E)
• Under Solver settings, change the Stop time from inf to a finite value (e.g., 0.01, 0.1, 1, etc.)
• The appropriate value depends on your circuit - for RF energy harvesting, start with 0.001 or 0.01 seconds

2. Switch Scope to Time Domain View

If you want to keep infinite/continuous simulation:

• Double-click your Scope block
• In the scope window, look for the display mode selector (usually a toolbar button)
• Switch from Spectrum Analyzer mode to Time Domain view
• This will show the waveform over time instead of frequency spectrum

3. Use Discrete Solver (if applicable)

Sometimes this helps:

• In Model Configuration Parameters → Solver
• Change Type from "Variable-step" to "Fixed-step"
• Set a reasonable Fixed-step size (e.g., 1e-6 for RF circuits)

For RF Energy Harvesting Circuits Specifically

Given your application, I recommend:

1. Set Stop Time: Use 0.01 or 0.001 seconds (10ms or 1ms) - enough to capture several RF cycles
2. Check your RF frequency: If you're working with MHz frequencies, ensure your simulation time is long enough to capture multiple periods
3. Solver settings: Use ode23t or ode15s solver for electrical circuits with fast dynamics

Additional Scope Settings

If you want spectrum analysis:

• Right-click the scope → Configuration Properties
• Under Time span, ensure it's not set to "Auto" if causing issues
• Set a specific time window for analysis

Try the finite stop time solution first - it's the most straightforward fix for your error!

[David Kwabena Amesimenu]

Thank you so much for the solution. I will try the solution and let you know what the outcome will be.

Also, I would like to know how to appreciate my answerer by adding a vote?

Thank you.