Question: When the parts are being tested, is it possible for the computer to miscalculate the air pressure and gravity? If so what effects could this have?

Alessandra Treviso answered on 20 Jun 2017:

Air pressure and gravity are constant and they are normally already implemented in the software I use. However, as a user, you can modify these values if you believe the conditions in which the test is performed are different.
The effect is different, depending on thetype of test you are running. If you want to measure something that depends on pressure, that is it varies as the sorrounding pressure varies, then your results might not be accurate. In some cases however, you can get away with it if you know what relationship exists between the air pressure and the quanitity you want to know. At the same time though, the instruments you are using can be sensitive to that. Instrumentations is always calibrated before doing a test. It’s like resetting them to zero to account for the room conditions. Calibration is a very broad and important field.
It is good practice when doing a test to record the conditions in the room. Some tests require that these conditions are ketp under contol during the tests to avoid errros.
Hope that was clear, there was a lot in there!