psi Pounds per square inch
PC Personal computer
Pt Total pressure (Pitot)
Pt1 Pitot pressure channel 1
Pt2 Pitot pressure channel 2
Qc Differential pressure Pt1-Ps1
QFE Local atmospheric pressure
QNH Barometric pressure at sea level
REF Reference
RGA Return Goods Authorization (Druck procedure)
RMS Root mean square
ROC Rate of climb
RS232 Serial communications protocol
Rt Rate
Rt CAS Rate of CAS
RTC Real time clock
SCPI Standard commands for programmable instruments
SST Standard Serviceability Test
ST Stainless steel
TAS True Airspeed
VVolts
VA Volt Ampere
+ve Positive
-ve Negative