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ADXL50 Arkusz danych(PDF) 4 Page - Analog Devices |
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ADXL50 Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 16 page ADXL50 –4– REV. B Polarity of the Acceleration Output The polarity of the ADXL50 output is shown in the Figure 1. When oriented to the earth’s gravity (and held in place), the ADXL50 will experience an acceleration of +1 g. This corre- sponds to a change of approximately +19 mV at the VPR output pin. Note that the polarity will be reversed to a negative going signal at the buffer amplifier output VOUT, due to its inverting configuration. Mounting Considerations There are three main causes of measurement error when using accelerometers. The first two are alignment and transverse sen- sitivity errors. The third source of error is due to resonances or vibrations of the sensor in its mounting fixture. Errors Due to Misalignment The ADXL50 is a sensor designed to measure accelerations that result from an applied force. Because these forces act on the sensor in a vector manner, the alignment of the sensor to the force to be measured may be critical. The ADXL50 responds to the component of acceleration on its sensitive X axis. Figures 2a and 2b show the relationship be- tween the sensitive “X” axis and the transverse “Z” and “Y” axes as they relate to the TO-100 package. Figure 2c describes a three dimensional acceleration vector (AXYZ) which might act on the sensor, where AX is the compo- nent of interest. To determine AX, first, the component of accel- eration in the XY plane (AXY) is found using the cosine law: AXY = AXYZ (cos θ XY) then AX = AXY (cos θ X) Therefore: Typical VPR = 19 mV/g (AXYZ) (cos θ XY) cos θ X Note that an ideal sensor will react to forces along or at angles to its sensitive axis but will reject signals from its various trans- verse axes, i.e., those exactly 90 ° from the sensitive “X” axis. But even an ideal sensor will produce output signals if the trans- verse signals are not exactly 90 ° to the sensitive axis. An accel- eration that is acting on the sensor from a direction different from the sensitive axis will show up at the ADXL50 output at a reduced amplitude. Table I. Ideal Output Signals for Off Axis Applied Accelerations Disregarding Device Alignment and Transverse Sensitivity Errors % of Signal Appearing Output in gs for a 50 g θ X at Output Applied Acceleration 0 100% 50 (On Axis) 1 ° 99 98% 49.99 2 ° 99.94% 49.97 3 ° 99.86% 49.93 5 ° 99.62% 49.81 10 ° 98.48% 49.24 30 ° 86.60% 43.30 45 ° 70.71% 35.36 60 ° 50.00% 25.00 80 ° 17.36% 8.68 85 ° 8.72% 4.36 87 ° 5.25% 2.63 88 ° 3.49% 1.75 89 ° 1.7% 0.85 90 ° 0% 0.00 (Transverse Axis) +1g TAB PIN 5 Figure 1. Output Polarity at VPR Z Z X TRANSVERSE Z AXIS SENSITIVE (X) AXIS SIDE VIEW X TAB PIN 5 Figure 2a. Sensitive X and Transverse Z Axis TRANSVERSE Y AXIS TOP VIEW Y X Y SENSITIVE (X) AXIS X TAB PIN 5 Figure 2b. Sensitive X and Transverse Y Axis θx θxy Y Axis X Axis Axy Ax Axyz –Z Axis Figure 2c. A Vector Analysis of an Acceleration Acting Upon the ADXL50 in Three Dimensions |
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