Electronic Test Equipment: Adding non-idealities

Hello Autodesk/TinkerCAD,

We are absolutely loving your on-line tool.  We're using it to teach introductory circuits to first-year college students.

One major feature I like about TinkerCAD is that it looks realistic, meaning, circuits looks like they are built in the lab.

I'm finding, however, several key non-idealities are missing when it comes to laboratory test equipment:

1. Function generators have no series resistance, when, in fact, every function generator has a 50-Ohm series resistance.  

2. Multimeters have no series resistance when measuring current.  Typical values are 5-Ohms when measuring current up to 100-mA.  Making this a variable would allow it to measure higher currents.  Regardless, every current meter adds some resistance in series.

3. Multimeters have no parallel resistance when measuring voltage.  Typical values are 10-MOhms.

You might say that adding non-idealities makes things annoying.  Nevertheless, students have to "learn to use laboratory instruments," just like they have to learn to create circuits.

Thank you very much!



Please sign in to leave a comment.