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Old 09-19-2018, 11:40 AM   #1
riclourenco's Avatar
Default PIPA Bias check

Hello everyone

Can anyone tell me if this is the correct procedure for the LEM PIPA Bias check in Apollo 9?

Measurement & Loading of PIPA Bias
1 DET - Reset
Rates < 0.1/ sec
CMC Mode - Free
2 V25N 21E, E,E,E/ Start Event Timer
3 V06 N21 (do not ENTR)
06 21 XYX PIPA Counts
4 At T+ 1:04 - ENTR
Record (X) R1 ____ (Y) R2____ (Z) R3 ____ (+- 000AB)
5 V21N 01E (Use same sign as above)
F 21 01 1452 E (Calculated X BIAS) E, E, (+- AB000)
1454 E (Calculated Y BIAS) E,E
1456 E (Calculated Z BIAS) E


Last edited by riclourenco; 09-19-2018 at 05:10 PM.
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Old 09-20-2018, 12:47 PM   #2
jalexb88's Avatar

This question was answered here:


To re-state it here for others, yes that procedure should be the correct one, however the simulated IMU is "perfect" so it would be important not to actually load any new bias as this could have bad effects in any situation where the CMC/LGC is measuring acceleration (Average-G).

Last edited by jalexb88; 09-20-2018 at 12:51 PM.
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