I send the following questions to analog technical support an I was redirected here. Hope you can help me!
1、In the ADXRS453.pdf the artical describes "excellent 16°/hour null bias stability "
but in the MEMS_Inertial_Sensors_Selection_Tables.pdf it describes In-Run Bias Stability 16°/Hr.
Do the two features have the same value?
2、Can the registers "PIDx" have other values expect 0x5201,0x5202 and so on? The num I have read
is 0x0100, am i wrong?
3、I have three ADXRS453(two LCC_V and one SOIC_CAV) in my system to sense x,y axis(LCC_V)and z-axis(SOIC_CAV).
For null calibration, i do the average of 2000 values sampled at the static condition .
My sampling cycle is 20.8ms,and i restart the system for 8 times. For each axis the 8 average values are:
x (0.394, 1.23, 1.186, 1.119, 1.142, 1.156, 1.183, 1.188)
y (-1.155, -3.459, -2.713, -2.307, -2.392, -2.636, -3.193, -2.999)
z (2.127, 2.318, 2.644, 2.574, 2.616, 2.515, 2.310, 2.354)
Then my question is: For one ADXRS453, why the average value is obviously different from the others(the y-axis the most notable)?
For example, the y-axis( -1.155 and -3.459)( -2.636 and -3.193). In this case,how can i do null calibration?or Did i get the wrong data?
4、What is the difference between the parameter "NULL ACCURACY"(in the ADXRS453.pdf p3 table1)
and "Initial Null"(in ADIS16130.pdf p3)?