VERTICAL REFERENCE GYRO
VRS-S132-1AD Single Axis
VRS-S232-1AD Dual Axis

VRS-S132-1AD & VRS-S232-1AD

The Watson Industries vertical reference System is a solid-state gyro package used to measure angular displacement and rate, especially where dynamic motion may interfere. Under these conditions, the effects of lateral accelerations severely limit the performance of an ordinary accelerometer or pendulous device. The Watson Vertical Reference achieves improved performance by integrating the output of a vibrating structure gyro to get an estimate of the attitude, which is then compared to the output of conventional accelerometers to find the error. This error is then filtered over a long time constant and subtracted from the rate gyro output to correct biases as a closed loop error correction system. This system lets the gyro dominate the attitude accuracy above the correction loop frequency while the accelerometer reference dominates the lower frequencies.

This sensor package uses smaller MEMS gyros. This allowed us to reduce the height of the VRS-S232 to almost half that of the VRS-E232.

The Watson vertical reference can be a functional replacement for mechanical vertical gyros, which are often more expensive and less reliable than this solid-state sensor. The Vertical Reference System is especially suited for applications where there is limited bank and elevation such as ships, underwater vehicles, some land vehicles, and certain camera applications. This is because the VRS uses a linear coordinate system. For better performance, a full three axis system would be required. Consult the factory about your application.

The VRS is used to stabilize and control ships and submersibles, to stabilize antenna and camera platforms, to instrument industrial equipment, and for many other applications.

Specifications
		VRS-S132-1AD	VRS-S232-1AD
Attitude		Single Axis	Dual Axis
	Range: Bank	Not available	±75° (±30°)	Digital (Analog)
	Range: Elevation	±75° (±50°)	±75° (±30°)	Digital (Analog)
	Resolution:	0.02°	0.02°	Binary mode (14 bit)
	Analog Scale Factor:	5°/V	3°/V	±10V Output
	Accuracy: Static	±0.5°	±0.5°
*	Accuracy: Dynamic	±2%	±2%
Angular Rate
	Range: Roll	Not available	±100°/sec
	Range: Pitch	±100°/sec	±100°/sec
	Resolution:	0.01°/sec	0.01°/sec	Binary mode (14 bit)
	Analog Scale Factor:	10°/sec/V	10°/sec/V	±10V Output
	Scale Factor Accuracy:	2%	2%
	Bias: Roll	Not available	< ±0.3°/sec
	Bias: Pitch	< ±0.3°/sec	< ±0.3°/sec
	Non-Linearity:	< 0.05%	< 0.05%	Full scale range
	Bandwidth:	20 Hz	20 Hz
Acceleration
	Range: X, Z	±10g	±10g
	Range: Y	Not available	±10g
	Resolution:	4mg	4mg
	Analog Scale Factor:	1g/V	1g/V	±10V Output
	Scale Factor Accuracy:	1%	1%
	Bias: X, Z	< ±10mg	< ±10mg
	Bias: Y	Not available	< ±5mg
	Non-Linearity:	< 1%	< 1%	Full scale range
	Bandwidth:	20 Hz	20 Hz
Environmental
	Temperature: Operating	-40°C to +85°C	-40°C to +85°C
	Temperature: Storage	-55°C to +85°C	-55°C to +85°C
	Vibration: Operating	2.5g rms	2.5g rms	20 Hz to 2 kHz
	Vibration: Survival	10g rms	10g rms	20 Hz to 2 kHz
	Shock: Survival	500g	500g	10mS ½ sine wave
Electrical
	Frame Rate:	71.1Hz	71.1Hz	Maximum
	Startup Time: Data	5 sec	5 sec
	Startup Time: Fully operational	10 sec	10 sec
	Input Power:	10 to 30VDC	10 to 30VDC
	Input Current:	180mA @ 12VDC (2.2W)	210mA @ 12VDC (2.5W)
	Digital Output:	RS-232	RS-232
	Analog Output:	±10VDC	±10VDC
	Analog Output Impedance:	300 Ohm	300 Ohm	Per line
Physical
	Axis Alignment:	< 0.25°	< 0.25°
	Size: Including Mounting Flanges	3.24"Wx5.78"Lx2.38"H	3.24"Wx5.78"Lx2.38"H
	Weight:	20oz (1.2lb)	20oz (1.2lb)
	Connection: RS-232 / Analog Outputs	9 pin female "D" subminiature	9 pin female "D" subminiature
	Connection: Power	9 pin male "D" subminiature	9 pin male "D" subminiature
*	Actual accuracy can be calculated as the listed percentage multiplied by the change in value over the entire dynamic maneuver.
•	Specifications are subject to change without notice.
•	This product may be subject to export restrictions. Please consult the factory.

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