JET PROPULSION LABORATORY | INTEROFFICE MEMORANDUM | |
TO: | Dave Gruel | S & I DFM 97-001 |
FROM: | Tim Schofield | 25th March 1997 |
SUBJECT: | ASI/MET Accelerometer - Data Conversion Expressions. | |
REFERENCE: | (1). AIP data conversion expressions - Revision B, S & I DFM 96-014, 18th December 1996. From: Tim Schofield To: Distribution |
This memo gives calibration expressions for the six ASI/MET science and engineering accelerometers, based on the laboratory calibration work of 2/96 and measurements taken in flight during spacecraft spin down of 12/12/96.
A linear, temperature-dependent conversion from counts to acceleration is used for each accelerometer head and gain setting, so that:
Acceleration in g's = (Counts - A(T)) / B(T)
The table below gives A0, A1, B0, and B1 for each head and gain setting. The temperature sensor channel identifications associated with each head are also given. Temperature sensor conversions are given in reference (1).
Head | Sx | Sy | Sz | Ex | E+yz | E-yz | |
---|---|---|---|---|---|---|---|
Accelerometer Channel | W-2001 | W-2002 | W-2003 | L-2001 | L-2002 | L-2003 | |
Temperature Sensor | W-4001 | W-4002 | W-4003 | L-4050 | L-4051 | L-4052 | |
40 g | A0 Counts | 2.75 | -0.97 | 0.83 | 1.35 | -0.02 | -0.66 |
Range | A1 Counts/°C | -0.023 | -0.003 | -0.003 | -0.005 | -0.000 | -0.001 |
B0 Counts/g | -184.118 | -185.581 | -183.928 | -182.776 | -183.450 | -183.924 | |
B1 Counts/g/°C | -0.028 | -0.025 | -0.030 | -0.032 | -0.032 | -0.029 | |
800 mg | A0 Counts | -4.17 | 8.40 | 1.58 | 12.33 | -4.93 | -6.67 |
Range | A1 Counts/°C | -0.012 | -0.011 | -0.003 | 0.024 | 0.043 | 0.019 |
B0 Counts/g | -9008.76 | -9031.40 | -8978.62 | -8938.97 | -8933.65 | -8976.08 | |
B1 Counts/g/°C | -0.805 | -0.731 | -0.822 | -0.798 | -0.697 | -0.729 | |
16 mg | A0 Counts | -313.76 | 408.90 | 51.90 | 562.73 | -336.07 | -287.37 |
Range | A1 Counts/°C | -0.284 | -0.512 | 0.095 | -0.854 | 1.336 | 0.401 |
B0 Counts/g | -445743.0 | -446319.0 | -444297.0 | -442228.0 | -441730.0 | -444094.0 | |
B1 Counts/g/°C | -34.0 | -33.0 | -37.0 | -35.0 | -38.0 | -26.0 |
Notes on the Calibration Table.