Dear All,

I am trying to make a mathematical model for ADIS16405.. My problem is BIAS TEMPERATURE COEFFICIENT and BIAS VOLTAGE SENSITIVITY...

How do I handle these two constants?

1. BIAS TEMP COEFF.

Bias Temp Coeff of ADIS16405 is +/-0.01 deg/sec/C

what does this +/- mean?

Reference temperature is 25 C

Assume I am using the imu at 15C for 10 min.s

Error = (25-15) x (0.01) x (600) = 60 Degrees?? ???

2. BIAS VOLTAGE COEFF.

Bias Voltage Coeff of ADIS16405 is 0.32 deg/sec/V

Nominal Voltage is 5.00 V

Does this mean:

2.1 If my power source is 5.25 V

for again 10 min of run

Error = (5,25-5) x (0.32) x (600) = 48 degrees ????

2.2 If my powe source is 4.75 V

Error = (4.75-5) x (0.32) x (600) = MINUS 48 degrees ????

Can you please help in this error calculations

Regards

No worries! Ask as much as you like! This probably warrants more discussion. For the power supply sensitivity, we expect this to be constant for a particular unit; the parameter describes a distribution across a population of units. The bias tempco is different because it represents the residual error that is left over after calibration. Since the residual error is not linear, the bias tempco can change over temperature. So, the +/-0.01 deg/sec describes what the behavior can do over temperature. We don't specify devices like this anymore, but since this is a relatively old design (3 generations ago), I am bound to the information that is available. If you look at our newer IMUs, we tend to lay the bias tempco over characterization plots that describe the behavior, as shown below: