Error: Time Step Too Small in Multisim
Primary Software: Electronics Workbench>>Multisim
Primary Software Version: 9.x
Primary Software Fixed Version: N/A
Secondary Software: N/A
Problem: How do I fix a
Time Step Too Small Error?
Solution: The
Time Step Too Small Error in Multisim is a very generic error that can represent a number of different simulation issues.
In smaller circuits this error is generally due to a mistake in wiring or connecting components, so this must be checked first.
If the wiring has been validated in the circuit follow these steps:
- Select Simulation » Interactive Simulation Settings
- Under Initial conditions select Set to zero
- Click the OK button
Check to see if the simulation now works. If not:
- Select Simulation » Interactive Simulation Settings
- Change Maximum Time Step (TMAX) from 1e-005 to 1e-003
- Click the OK button
Check to see if the simulation now works. If not:
- Select Simulation » Interactive Simulation Settings
- Select the Analysis Options tab
- Select the Use Custom Setting radio button and click on the Customize button
- Select the Global tab
- Set Relative Error Tolerance [RELTOL] to 0.01
- Set Shunt resistance from analog nodes to ground [RSHUNT] to 1e+9
- Select the Transient tab
- Set Integration Method [METHOD] to Gear
- Click the OK button
- Click the OK button
In Multisim 10.x and higher the Convergence Assistant conveniently tries to fix this error for you.
Related Links: NI Multisim 10.1 and NI Ultiboard 10.1 UpgradeKnowledgdebase 4LEC2OXL: Convergence Error With Digital Simulation Set to Real in Multisim and ELVIS
Attachments:
Report Date: 10/12/2006
Last Updated: 05/22/2009
Document ID: 42BBUPDK
