Altronics Air Quality Computer User Manual page 16

Sea Level ET OA: ET car will run at 0' oxygen altitude.
(Optional)
Alt Ratio DA: Time in seconds ET will change with a
100' change in density altitude.
Alt Ratio OA: Time in seconds ET will change with a
100' change in oxygen altitude. (Optional)
TS Ratio DA: Time in seconds Throttle Stop will need to
change in order to change ET of car
0.01sec in density altitude.
TS Ratio OA: Time in seconds Throttle Stop will need to
change in order to change ET of car
0.01sec in oxygen altitude. (Optional)
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