Troubleshoot a Space Pressure Transducer on a Trane Voyager 3

I calculated what I believe the formula should be to find what your output signal should be if you know your space pressure. The formula to tell what the VDC output signal should be per the space pressure is (to the best of my ability) as follows:

Minimum VDC Output of 0.25 + Multiplier of 0.384 × ( Space Pressure + Negative Pressure Rating of 0.75) = VDC Output Signal

See the following example. If my building space pressure is 0.06" WC I can calculate the output VDC signal as follows.

Example: 0.25 + .384 x (.06 + 75) = 0.561VDC

At 0.06" WC, I expect to see a signal closely approximating 0.561 VDC. The greater the pressure, the greater the VDC output. This is a linear change and could be really plotted on a chart. If I find a chart, l'll share it. In the video I mentioned if the supply fan is off and the space pressure is 0"WC, then your output signal should be 0.25. That is incorrect. It would be 0.25 VDC output only if the space pressure was -0.75"WC. If the space is at 0"WC, then your reading should be about 0.54 VDC. You can also disconnect the tubing to the transducer and that should create a 0"WC signal.