My memory has failed me as I have forgotten how to do this. DC operating point? Reducing the Vs to 1V and... Yes, I can do it with a pencil and paper and the answer is 1.5kΩ. The book I'm using (Malvino's Electronic Devices) uses Multisim, which I don't have or want. I need to be able to do this in LTS.

 

hi Sam,
Is this video any help, shout if you need input.
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hi Sam,
Not impressed with that video, he rambles On and On.!!!
Try this.
http://www.zen22142.zen.co.uk/ltspice/dccircuits.htm

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@ericgibbs Good intro to LTS but nothing on Resistance... There is a way to "trick" LTS into doing resistance measurements but I just flat can't remember how...

 

Try this.

Nope, all V & I, no R...

 

hi,
Not sure I follow what you are trying to do.
Are you trying to get LTS to calculate the equivalent resistance of that circuit you have posted,?

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Aha! Google found my original ask on Stack Exchange with the answer! LTspice XVII solving Thevenin Resistance basics - Electrical Engineering Stack Exchange

It's a neat trick! Now if I can just remember it the next time I need it. By putting a 1A current into the circuit it gives you the Voltage which will be the Rth value.

 

hi Sam,
This shows two ways to get the result.
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OT: Sorry about the hic up, I think its time for a coffee.

 

K, didn't think about using the calculation feature as I am not that familiar with it. Was surprised to see kΩ on the graph until I saw the heading for the plotline and then the bulb lit up over my head. I'm still low on the learning curve for LTS.

 

hi,
When using the Add Trace, you can enter chosen value from the listed values and use arithmetic symbols.
Click on the chosen symbol and it will be loaded into that text entry box at the bottom.
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