Question: I recently purchased a new computer. I copied the entire Micro-Cap
directory over from the older system and then reinstalled the security key driver.
The program loads fine, but when I attempt to simulate one of my existing circuits, I
get the error message:
No such file or directory D:\MC8\DATA\MyCircuit.TNO
Isn't the TNO file the numeric output file? Why does it need to find it at the beginning
of the simulation and how do I resolve this error?
Answer: The TNO file is the numeric output file for transient analysis. At the
beginning of the transient simulation, Micro-Cap will create the TNO file to begin writing
data to. In this case, the file is not the problem, it is the directory path that Micro-Cap
is objecting to when trying to create the file. Most likely, when Micro-Cap was copied from
one system to the other, either the partition or the directory that it was located in changed
between the source and destination systems. Since the entire Micro-Cap directory was copied
over, the new system is using the path references set up for the old system. To remedy this,
go to the File menu and select the Paths option. Make sure that the paths specified for the
Data field actually exist on the new system. Once this path has been corrected, the error
message should no longer appear.
Question: I am trying to determine the continuous effective power at my load
resistor. I plot the following expression:
RMS(PD(RL))
but this doesn't produce the results I am looking for. When I plot the next
expression:
RMS(V(RL))* RMS(I(RL))
I get the expected curve. Why is there a difference between the two?
Answer: The difference occurs due to the point at which the RMS operator takes
effect. In the first expression, the RMS is being calculated based on the instantaneous
power of the resistor which would be equivalent to:
RMS(V(RL)*I(RL))
In the second expression, both the current and voltage have their RMS value calculated
individually, and then the two RMS values are multiplied together. The second expression
is the commonly accepted definition for determining power in AC circuits.
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