SPEEDBOX MK2 Specifications

Specification SPEEDBOX
Parameter	Value
High accuracy non-interpolated combined speed output	200Hz
Raw acceleration output	200Hz
GPS receiver	Race Technology PurePhase
Raw GPS output	20Hz
Typical GPS positional accuracy*	3m CEP
Optimum GPS positional accuracy*	1m CEP
Typical combined speed output accuracy*	0.05 kph
Accelerometer	3-axis, high precision, 0.0039g resolution, 2 or 6g range
Power supply	9-30v 2.4W (RTK option 3W)
Weight	800g
Dimensions	199mm x 135mm X 43mm
Pulse output	Either: Speed pulse: 0-5V, 10-100�S high time or 50% duty cycle 1-400 pulses per meter. Frequency range DC - 50kHz Or Time pulse: 0-5V, 1Hz @ 50% duty cycle, precisely synchronised to GPS time.
Analogue output	Up to 4, -5 to 5V @ 50ohm load, -10 to 10V @ infinite impedance
Analogue inputs	0-20V Single ended, 16 bit resolution
Connectors	RS232 ports CAN Expansion port (front) Expansion port (back) Analogue ports Power Trigger input Pulse output GPS antenna	9 way male D-type 9 way male D-type 9 way male D-type 9 way male D-type LEMO 0B 4 pin LEMO 0B 2 pin BNC female BNC female SMA female
Antennas	3.3V active antenna

IMU option specifications

Technical specification Gyroscopes
Parameter	Conditions	Min	Typ	Max	Unit
GYROSCOPE SENSITIVITY	Each axis
Dynamic range		�300	�350		�/s
Initial sensitivity		0.0495	0.05	0.0505	�/s/LSB
Temperature coefficient			40		ppm/�C
Gyroscope axis nonorthogonality	Difference from 90� ideal		�0.05		Degree
Gyroscope axis misalignment	Relative to base-plate and guide pins		�0.5		Degree
Nonlinearity	Best fit straight line		0.1		% of FS
GYROSCOPE BIAS
In run bias stability	1σ		0.007		�/s
Angular random walk	1σ		2.0		�/√hr
Bias temperature coefficient			�0.01		�/s/�C
Linear acceleration effect on bias	Any axis, 1σ		0.05		�/s/g
GYROSCOPE NOISE PERFORMANCE
Output noise	� 300�/s range, no filtering		0.9		�/s rms
Rate noise density	f= 25 Hz, � 300�/s, no filtering		0.05		�/s/√Hz rms
GYROSCOPE FREQUENCY RESPONSE
3 dB bandwidth			330		Hz
Sensor resonant frequency			14.5		kHz

Technical Specification Accelerometers
Parameter	Conditions	Min	Typ	Max	Unit
ACCELEROMETER SENSITIVITY	Each axis
Dynamic range		�18			g
Initial sensitivity		3.285	3.33	3.38	mg/LSB
Sensitivity temperature coefficient			�50		ppm/�C
Axis nonorthogonality	Difference from 90� ideal		�0.2		Degree
Axis misalignment	Relative to base-plate and guide pins		�0.5		Degree
Nonlinearity	Best fit straight line, �17g		0.1		% of FS
ACCELEROMETER BIAS
In-run bias stability	1σ		0.2		mg
Velocity random walk	1σ		0.2		m/s/√hr
Bias temperature coefficient			�0.3		mg/�C
ACCELEROMETER NOISE PERFORMANCE
Output noise	No filtering, 0g		9		mg rms
Noise density	No filtering, 0g		0.5		mg/√Hz rms
ACCELEROMETER FREQUENCY RESPONSE
3 dB bandwidth			330		Hz
Sensor resonant frequency			5.5		kHz