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| Single Axis (VRS-E132-1AD) |
Solid State Vertical Reference
VRS-E132-1AD
VRS-E232-1AD
Click here to see our ADS series vertical gyro.
Description:
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.
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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, with either an Euler or Quaternion coordinate system would be
required. Consult the factory about your application.
Applications:
The VRS is used to stabilize and control ships and submersibles, to stabilize
antenna platforms, to instrument automobiles, and for many other applications.
Features:
| • | | Solid State, Strapdown System |
| • | | High Accuracy |
| • | | Low Cost, Low Power |
| • | | Rugged, High Reliability |
| • | | Analog and RS-232 Digital Outputs |
| • | | Two Year Limited Warranty |
| • | | Engineering Support |
Vertical Reference
VRS-E232-1AD / VRS-E132-1AD
Specifications |
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 | ±0.3° | ±0.3° |
| * | 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: | 1% | 1% |
| Bias: Roll | Not available | < ±0.02°/sec |
| Bias: Pitch | < ±0.02°/sec | < ±0.02°/sec |
| Non-Linearity: | < 0.03% | < 0.03% | Full scale range |
| Bandwidth: | 20 Hz | 20 Hz |
Acceleration |
| Range: X, Y, Z | ±10g | ±10g |
| Resolution: | 4mg | 4mg |
| Analog Scale Factor: | 1g/V | 1g/V | ±10V Output |
| Scale Factor Accuracy: | 1% | 1% |
| Bias: X, Y, Z | < ±5mg | < ±5mg |
| Non-Linearity: | < 1% | < 1% | Full scale range |
| Bandwidth: | 20 Hz | 20 Hz |
Environmental |
| Temperature: Operating | -30°C to +60°C | -30°C to +60°C |
| Temperature: Storage | -55°C to +85°C | -55°C to +85°C |
| Vibration: Operating | 5g rms | 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: | 210mA @ 12VDC (2.5W) | 270mA @ 12VDC (3.2W) |
| Digital Output: | RS-232 | RS-232 |
| Analog Output: | ±10VDC | ±10VDC |
Physical |
| Axis Alignment: | < 0.25° | < 0.25° |
| Size: Including Mounting Flanges | 3.24”W x 5.78”L x 2.75”H | 3.24”W x 5.78”L x 4.08”H |
| Weight: | 21oz (1.3lb) | 26oz (1.6lb) |
| 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 |
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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. |
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VRS Vertical Gyro Dimensions |
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Single Axis VRS-E132-1AD |
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Dual Axis VRS-E232-1AD |
