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Practical digital pressure sensor circuit

7; 4 standard pressure gauge for the quasi-Prism flooded and three semi-number table test, uniformly distributed within the range of five points on the measurement error and linearity error are zero. (3) The wide use. O ~ 5V output standard analog voltage signal. Digital meter can be displayed directly, but also with the computer or other automatic measuring instrument directly interface. (4) performance and stability. After several months of actual use and testing, proven to work reliably, no drift. Circuit as shown in photo, YC for the bridge arm resistance 350Q of the strain gauge pressure sensor, the actual use of visual specification used in this article are asked to select the measuring range is 0 ~ L5MPa: ~ t0mV/MPa the sensor sensitivity. Sensor voltage signal after conversion by the output of ② and ④ feet were added to the Ict ② against bad input pin and inverting input pin to zoom ③ treatment. Sensor ①,ugg milano, ③ feet to the positive and negative power input. s and wind resistance for the buck. Should be used in power is greater than (1 / 2) W error of less than ± l rhyme precision resistors. VD and m diode limiter circuit composed of two-way. To prevent excessive pressure, the sensor output voltage greater damage IC,. Icl compensation for use of the general-purpose linear amplifier LM741, ⑦, ④ respectively, then the foot and a 15V +15 V power supply. RPt to zero potential, both ends of the connection ①, ◎ feet,tory burch shoes, the center head to the negative Tuen source. Potentiometer RiPz and!. Triple vessel:. Lan Wong! II:: feedback loop composed of resistors connected in series. Ic-connected to the inverting input and output ⑥ ② feet between the foot and change the value of R2. Linear amplifier gain can be changed. Therefore, R can be used as full-scale adjustment. Wind, RPs and wind component partial pressure measuring circuit output signal, adjusting the value of resistors, can voltmeter shows the voltage values consistent with the measured pressure value. If the direct use of O ~ 5v analog signal, you can remove this part of the circuit, the Ic-@ pin output directly. Convex and the power supply filter capacitor. J1 all components of a welding is completed, check and correct power can be done after the debugging. Debugging should be used three half-number table or other high-accuracy digital voltmeter to ensure the accuracy of measurement. The following steps: (1) power measurement sensor ①, ③ pin voltage should be +1.50 V, respectively, and a 1.50V, allowing the error absolute value is not greater than 0.05V, if the deviation of the larger, may be appropriate Buck Island, or Phoenix to adjust resistance, the voltage to meet the requirements (2) Zero adjustment: the pressure is zero (no added pressure),ugg italia, the measured Ic-◎ pin output voltage, while regulating RP-, the voltage meter reading to 0. 00V; (3) full-scale adjustment: a pressure sensor range limit imposed by the pressure, regulate RP, so that the output voltage of IC1 ◎ pin 5.00V; (4) measurement shows adjustment: the full-scale, measuring RPa center head output voltage. Indicates the voltage value of the same value with the full scale pressure. If full-scale pavilion is 1.5MPa,ugg boots billig, the regulator RPs,stivali ugg, so that the voltage table shows 1.50v. Thus, the voltage display to replace the measured pressure value can be directly read. Deposition times repeated adjustment, is correct. Can be put into use. Electronic meter for continuous count 1 (Mo, double-City Water Company meter factory, 43071) 'Count the implementation of electronic water meters, with a simple calculator chip is very easy to implement, but to achieve a continuous count and display, reduce counting error, then there is how sensor signals are processed on the issue. Use of rotating impeller mounted on a plug-in for the Hall switch sensor. The flow test, 100 ~ 800mm diameter pipes, each pulse corresponding to the flow switch in 0.014s ~ 0.9475m between value (the value of this traffic system as a core set of values, see below). To achieve continuous counting, must make each switch pulse output of 148 ~ 9475 corresponds to a count of consecutive pulse (counting the results of the decimal point position can be man-made), the use of PLL frequency and frequency technology to solve this problem. Is the counting error was 0.001m. As an example for analysis of their body, Figure 1 shows the block diagram. l of a frequency, cycle 2 is the multiplier circuit, including the town of Central and sub-Xuan device, which is spear-phase ring CC4046, CC4518 composed of two tactics - 10 divider. Function of the circuit switching pulse frequency extension is 1O times. CC4046 has a maximum operating frequency of 1200kHz. Therefore, the frequency of the pulse signal switching up to l2OH2 (does not meet the actual value of the two). . l2. Coefficient of frequency, Figure 3 shows the coefficient of frequency circuit. Formed by the four coefficient multipliers 034,527, and its coefficient is 8421BCD code dial switch presets. The figure shows the core set coefficient of 9475. This corresponds to a switch circuit of each pulse, the output 9475 consecutive pulses.

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