Sensors » Crista IMU

Crista IMU
CCT Part No. 900-00458-00

The Crista Inertial Measurement Unit

(IMU) is a small, three axis inertial sensor that provides high resolution angular rate and acceleration data via a serial interface. The standard serial interface provides temperature compensated rate and acceleration readings. The user controls data update rate and over-sample averaging of output data. A GPS Pulse-Per-Second (PPS) input signal interface allows time correlation of IMU and GPS data. The OEM Sensor Head is also available as a stand alone unit.

Key Features:

Calibration corrected raw data outputs
Three Axis Sensing, 300 deg/sec. rate and 10G acceleration.
GPS PPS input for data time stamping
RS232 and CAN interfaces
Output data rates >200 Hz, internal sample rates > 1 KHz, user selectable

Download the Crista IMU Data Sheet for complete specifications of the Crista IMU.

Specifications

Interface

Serial Interface:
Data Output Rate:
Internal A/D Rate:

RS232 and CAN
> 200 Hz User settable
> 1 KHz

Electrical

Vin:
Power:

4.4 – 8 Volts
0.5 W (typical)
0.75 W (max)

Mechanical

Size:
Weight:

2.05” x 1.55” x 1.00
36.8 grams (1.3 oz)

Gyros

	¹Range:	300 º /sec
	²Scale Factor Error:	< 3 º/sec (@ 25 ºC)
	In-Run Bias Error
	Fixed Temperature:	< 0.2 º/sec (warmed up)
	Over Temperature:	< 0.6 º/sec
	Linear Acceleration Effects:	<0.2 º /sec / G typical; 1.5 º /sec / G max uncorrected.
	Noise: (1, no over-samples)	< ± 0.7 º /sec
	³Cross Axis Rate Error:	2.6 % uncorrected (Includes alignment and off axis acceleration)
	A/D Measurement Resolution:	0.0155 º /sec
	Converted Data Rate Resolution:	0.009 º /sec (max rate = 300 º /sec)
	Bandwidth:	2 order LPF Fc=100 Hz

Accelerometers

	Range:	±10 G
	Scale Factor Error:	< 100 mG (0.98 m/s) (@ 25 ºC)
	In-Run Bias Error:
	Fixed Temperature:	< 25 mG (0.245 m/s)
	Over Temperature:	< 51 mG (0.500 m/s)
	Turn-on to Turn-on Bias	< 30 mG (0.295 m/s)
	Noise: (1, no over-samples)	< ± 12 mG (0.120 m/s)
	³Cross Axis Error:	2.6 % uncorrected (Includes alignment and off axis acceleration)
	A/D Measurement Resolution:	0.62 mG
	Converted Data Rate Resolution:	0.30 mG (max rate = 10 G)
	Bandwidth:	Simple LPF. Fc=100 Hz.

Higher rate ranges for the Gyros are possible. Contact CCT for more information.
Based on room ambient temperature. Nonlinearity from best fit straight line. Typically much better at lower rates/accelerations.
Includes alignment and off axis acceleration.

Environmental

Operating Temp:
Max Acceleration:

-40C to +70C (Calibrated Temp. Range)
500 G