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AM467 Scheda tecnica(PDF) 7 Page - Analog Devices |
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AM467 Scheda tecnica(HTML) 7 Page - Analog Devices |
7 / 9 page Precision amplifier for bridge circuits AM467 analog microelectronics February 2011 Analog Microelectronics GmbH Phone: +49 (0)6131/91 073 – 0 7/9 An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Rev. 1.1 Internet: http://www.analogmicro.de Email: info@analogmicro.de Once these resistors have been mounted the calibration procedure is complete. Depending on the accuracy of the resistors used an offset value of 0.5 V and a full scale signal of 4.5 V should have been obtained. Should the expected final accuracy require it, in an additional second stage (Stage 2) the offset of the output voltage can be corrected using resistor R1. To this end the AM467 output must again be measured at P = 0 bar. If at 0 bar the output is too high or too low by a few millivolts, for example, the Excel program then calculates the necessary second correction of R1 in ohms. The offset error which is then obtained if a different resistance is used in place of calculated resistance R1 can also be determined by the Excel sheet. The sensitivity in mV/ohm is instrumental here, providing information as to by how many millivolts the offset shifts when the used resistor R1 has a delta R (in ohms) to the calculated value. The given sensitivity value (mV/ohm) is multiplied by the delta R of resistor R1 to obtain a change in offset which affects both the offset (0.5 V) and the full scale signal (4.5 V). Figure 2: Ceramic sensing element with AM467 and a calibration network with external resistors. DIMENSIONING In the combination of ceramic sensing element and AM467 the operating point (the initial value of the four resistors R1 to R4) was determined for all sensing elements in a specific sensing element category. In the case of piezoceramic sensors the term "sensing element category" is used to denote sensing elements with the following characteristics: Bridge resistance: 11 kOhm ± 20% Sensitivity: 2.4 ± 1 mV/V IN+ IN- AM467 3 2 AMP VCC 8 OUT 1 GND 4 Vout GND C3 C2 R2 R1 R4 R3 Output stage with short circuit proofing C4 C1 |
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