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When I use a current source -- particularly a switched current source -- in a time-domain simulation, my plotted time scale is always out to 1 second, no matter what I specify as the stop time and time increment. this doesn't happen for voltage sources. I wouldn't rule out incompetence, but I haven't yet found out how to defeat this highly undesirable outcome. Any thoughts?

Hi Dr.Moon, could you please make the circuit public and post it here so I can take a look?

Just a thought: if you have a current source with a time-controlled or voltage-controlled switch in series, is there some current path for both states of the switch position? For example, a current source that has one end disconnected will result in a singular system.

Hi -- Yep, that was it. The current source was flapping in the breeze after the switch. Once I put another simultaneous switch in place to provide a current flow path, I got exactly what I expected. Thanks very much!! There's nothing special about the circuit, so I'd be glad to share it if you still want to see it, but it was just a learning exercise. Lesson learned. Thanks again -- Jim