Scott Lowther wrote:

Following the redesign of the SRBs a higher thrust differential
between the
two boosters was allowed. The data I posted reflects rather
sensitive
instrumentation with three significant figures right? Given the
resolution
of the xducers at 1/1000 of a PSI, what do you suppose the actual
accuracy
is in PSI?

*Precision* may be down to milli-psi, but *accuracy* is another
matter.

I will also point out that the way these (and most, I imagine) pressure
transducers work is to generate a voltage, and then convert that
voltage into a psi reading. During calibration, a "X millivolts = Y
psi" factor is worked out for each xducer. So even though you might see
a reading with numerous decimal points... 892.347 psi, say, what you
are actually seeing is what the conversion factor makes of, say, 68
millivolts. There's a lot of psi between 68 and 69 millivolts, so you
don't get the pressure readings between them. And yet you still wind up
with all those decimal points.

Them's the breaks when you use a digital system.