[Sam Cree]

I think the guy said that offscale low means that the thing had just quit reading at all, maybe burned up?

[snopercod]

Yes, "offscale low" means it just quit reading. Shuttle measurements are normally scaled 1-5 volts (1 volt is the lower range limit). So if the signal drops to zero volts, you know the wires have been cut, the excitation has failed, or the sensor itself has gone open.