Sherborne Releases Digital Servo Inclinometers

Sherborne Sensors has released a range of high-precision single- and dual-axis digital servo inclinometers for industrial, military and aerospace customers. The DSIC series is suitable for use in applications such as gun fire control systems, platform levelling, antenna control systems, geophysical systems, level control and calibration systems or in applications where precision angular measurements are required over a wide temperature range.

The series offers RS485 ASCII digital output and built-in active temperature compensation, with a total error band of 0.08deg from true input angle, at any temperature and any angle, for high-precision tilt measurements over an operating temperature range of -20C to +70C (-4F to +158F). Available in ranges of +/-15deg to +/-60deg and rugged to 1,500G mechanical shock, the DSIC series incorporates a servo-inclinometer element and 19-bit analogue-to-digital conversion capabilities to sense inclination to a high degree of accuracy with near-zero hysteresis and better than 0.001deg resolution.

Units incorporate dynamic filtering to eliminate unwanted vibration and noise, also facilitating fast response times. During factory calibration, each DSIC series inclinometer is programmed with individual output characteristics over temperature. Output bandwidth ranges are configurable to 20Hz, with options for custom connectors and electrical filters. A low-pass filter with a -3dB cut-off frequency at 20Hz ensures an attenuation of -40dB per decade. The dynamic filter also accommodates lower cut-off frequencies for vibration rejection without sacrificing the step-response time.

A window comparator monitors differences between filter input and output. When the difference exceeds a preset threshold, the filter increases its slew rate by setting filter output equal to input. The default setting of this threshold is 0.1 per cent of full-range output, user configurable to suit the application. The internal sampling rate is 4.8kHz. The default measurement update rate is 10Hz, but this may also be user configured.

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