DATA SHEET Operating Specifications Description The 0711-0744-99 Sensor has been used successfully in applications that demand a high accuracy for small angle ranges and excellent null repeatability. The sensor offers excellent stability over time and wide range of temperatures. The hermetic glass to metal construction and solid platinum electrodes guarantee a long operating life and stable operating characteristics. Angle Range Resolution Null Repeat Applications Include Construction Laser Instruments and Transits Aircraft Avionics Geophysical Monitoring Machine Tool Leveling Medical Positioning and Monitoring Physical Dimensions Vial length Vial diameter Lead length Impedance of the electrolyte may be changed to limit null current Viscosity of the electrolyte may be modified to meet individual requirements to reduce vibration Sensor Test Circuitry Tests were conducted by exciting the left and right electrodes with an AC signal of 400 Hz and an rms voltage to produce the maximum current at null as per operating specifications. Output readings are taken between the center electrode and the center of the balanced resistors R1 and R2. Tests were conducted at a temperature of +25 C. See sensor test circuitry in figure 3. Output curve is shown in figure 1. OUTPUT SENSITIVITY Figure 1 100 PERCENT OUTPUT 3 Operating Range (max.) Linear Range ± 5 arc minute Null Voltage ≤0.010 Volts Null Current(max.) 0.5 mA (continuous) Null Impedance (nom)1 1000 Ohms (25°C) (measured left to right electrode)see fig. 2 Null Repeatability < 5 arc seconds Resolution < 1 arc second Symmetry (typ) < 20 % -20 C to +50 C Operating Temperature -50 C to +100 C Storage Temperature Time Constant (1) 2 < 500 msec Materials non-magnetic ≤ 0.5 arc seconds / C Temperature coefficient at null (when properly mounted) Descrition of Test Values Caution!-Ensure that all test and operating circuits are entirely free of direct current. Direct current will cause level damage and/or instability. IMPEDANCE / TEMPERATURE Figure 2 2 IMPEDANCE (Kohms) TILT ANGLE (arc minutes) AC input voltage = Null Current (max) times Null Impedance (nom) Eout = Angle of tilt from null (Direction of tilt determined by phase of Eout) The Fredericks Company l 2400 Philmont Ave ● HuntingdonValley, PA 19006-0067 Tel: 215.947.2500 l Fax: 215.947.7464 l Email: [email protected] l www.frederickscom.com 0711-0744-99data sheet Revision: A