g Value?

Hello

there are 4 possible values for g coefficient to be used to convert the accelerometer values into m/s2: 

 1- the standard value  (1 g  =  9.80665 m/s^2)

2- the value of g at the calibration site (1g = 9.798 m/sec^2 as explained in   Definition of "g" )

3- the value of g at the location of using and navigating the IMU (calculated by the formula depending on Latt & Alt )

4- using any of above mentioned values dosnot affect gps-ins accuracy.

I think the standard value is the best answer but i am not sure .

please help. thanks

Hello taghi 

1g = 9.798 m/sec^2 for our parts

Here you can find some more info: Definition of "g" - Documents - MEMS Inertial Sensors - EngineerZone

Hope you question is solved,

Mario SM

Is it for all parts?

This value must had been stated clearly in datasheet!

Thanks

It was featured in older parts, and it is also mentioned in some app notes, but we will gather the feedback.

many thanks for your time!

Mario SM

Hello MarioSM

which of the old parts or app notes mention this number?(9.798)

many thanks for your reply.

taghi

Hello MarioSM

which of the old parts or app notes mention this number?(9.798)

many thanks for your reply.

taghi

Hello taghi, you can find old datasheets with basic introduction to this concepts as in the page 4 of this one: ADXL150/250 data sheet

As mentioned in my first answer, if you need more accuracy than that you can relay on WGS-84 calculations, which are our current standard.