The weight of wheat seeds is an important physical indicator of wheat. Depending on the conditions at the time of the assay, it can usually be determined by the weight of wheat under 1000 or 200 proof standard conditions of compaction. According to the specification, the measurement error should be less than 39 and 0.69 for 1000 and (550~9509) and Zooml (x7o~1909), respectively. Therefore, an instrument that can satisfy both of the above measurement methods at the same time should have an accuracy of 0.06%F·s. However, the current general electronic scale on the market cannot meet this requirement. For this purpose, the 8039 SCM and capacitive frequency type weight sensors were used to develop a bulk density tester.
The volumetric analyzer measures the frequency of the cycle to 8039 counter T; the counting cycle determines that the sensor pulse signal passes through the interrupt port I to specify the period of the measurement cycle. T, the maximum count rate of the mouth does not exceed }/3ALE, so the ALE signal is input to the T1 port after dividing by the Q24 of the counter 4040(2), and the sampling quantization error is 1 at the main oscillation of 6 MHz. four. For synchronization, P and 7 are used to control their clearing cr, and the sampling quantization error is smaller. Because the pulse frequency of the sensor is generally between 7~1IkHz, if it is measured directly, the error is too large. For this purpose, the signal from the sensor is level-shifted, after the 4069 Schmidt inverter is reshaped, it passes through the counter 404 . (1) It is divided into 51 frequency divisions, from Q, output, reversed by 4069, and sent to 80,391 wattage, which generates an interruption request and specifies the sampling period. 8039 ... P,. versus;. 40 (1) is connected to the control terminal cr and controls it.
To ensure the accuracy of the bulk density tester, the 4040(l) start-up must be synchronized with the sensor pulse, otherwise a large error will occur, and Pl is used for this purpose. The 4040(1) input pulse is detected, its falling edge is determined, and the 4040(1) and the counter are started, in fact due to the program execution delay, when 404. (1) After the start, the falling edge of the pulse has just passed, and the 4040 (1) counts the next pulse, which is equivalent to each sampling taking more than one pulse time, which does not affect the accuracy. In addition, due to T, the interrupt overflow and the IR coin interruption compete to produce timing error. However, its probability is very small and will be eliminated by software measures and digital filtering.
The volumetric analyzer measures the frequency of the cycle to 8039 counter T; the counting cycle determines that the sensor pulse signal passes through the interrupt port I to specify the period of the measurement cycle. T, the maximum count rate of the mouth does not exceed }/3ALE, so the ALE signal is input to the T1 port after dividing by the Q24 of the counter 4040(2), and the sampling quantization error is 1 at the main oscillation of 6 MHz. four. For synchronization, P and 7 are used to control their clearing cr, and the sampling quantization error is smaller. Because the pulse frequency of the sensor is generally between 7~1IkHz, if it is measured directly, the error is too large. For this purpose, the signal from the sensor is level-shifted, after the 4069 Schmidt inverter is reshaped, it passes through the counter 404 . (1) It is divided into 51 frequency divisions, from Q, output, reversed by 4069, and sent to 80,391 wattage, which generates an interruption request and specifies the sampling period. 8039 ... P,. versus;. 40 (1) is connected to the control terminal cr and controls it.
To ensure the accuracy of the bulk density tester, the 4040(l) start-up must be synchronized with the sensor pulse, otherwise a large error will occur, and Pl is used for this purpose. The 4040(1) input pulse is detected, its falling edge is determined, and the 4040(1) and the counter are started, in fact due to the program execution delay, when 404. (1) After the start, the falling edge of the pulse has just passed, and the 4040 (1) counts the next pulse, which is equivalent to each sampling taking more than one pulse time, which does not affect the accuracy. In addition, due to T, the interrupt overflow and the IR coin interruption compete to produce timing error. However, its probability is very small and will be eliminated by software measures and digital filtering.
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