SU859840A1 - Device for measuring transducer graduation - Google Patents

Description

(54) DEVICE OF GRADUAL MEASURING CONVERTER

The invention relates to the control of the HC-measuring technique, namely to the calibration systems of the measuring transducer. Known systems for testing and checking pressure transmitters include a reference signal source, a pressure transmitter, and a Cll recording instrument. The disadvantages of the known systems are the limited possibilities of using when performing calibration works with a large number of similar measuring transducers with individual non-linear characteristics. Calibration systems of the measuring transducer are also known, which contain a reference signal adjuster, a measuring transducer, a recorder, and a memory device 2. The disadvantages of such systems are comparatively low accuracy and limited use in group calibrations of the same type of transducers with individual non-linear characteristics, for example, of a parabolic type. The massive use of measuring transducers calibrated with lime calibration systems is difficult because of the need to store a large amount of information in the memory of the memory device. The purpose of the invention is to improve the accuracy and enhance the possibilities of use. The goal is achieved by the fact that two differentiating devices, a delay unit, two adders, three additional recorders with a second device are entered into the calibration device of the measuring converter, the main recorder with memory device. memory devices, two threshold devices, two dividers., comparison unit, coincidence circuit, key and schema} are avlenn, with one output of the set otnonchika The first signal is connected to a measuring transducer, the first output of which is connected through the main recorder with a memory device to the first input of the first adder, to the second input of which through the first additional recorder with a snapshot device and

The first threshold device is connected to the second output of the measuring transducer, the third output of which is connected through the first differentiating device to the first input of the first delrell, the second input of which is connected to the second output of the reference master. signal through the second differentiating device and the first output of the delay unit, the second output of which is connected through the second additional recorder with a storage device to the first input of the second adder, the second input of which is connected to the third output of the delay unit through the third additional recorder with a storage device and the second threshold the device, and the output of the second adder is connected with the first input of the second divider, the second input of which is connected with the output of the first adder, and the output of the second divider is connected to the first input of the comparator unit, the second input of which is connected to the output of the first divider and whose output is connected via a coincidence circuit with the key for outputting the calibration coefficient of the measuring transducer, the first output of the key is connected to the storage device and the output of the key is connected via the control circuit with the input of the reference signal adjuster.

The drawing shows a diagram of the device.

In the calibration scheme, the setpoint 1 of the reference signal by one output 2 is connected to the measuring transducer 3. The first output 4 of the measuring transducer 3 is connected through the main recorder 5 with a memory device 5 to the first input 6 of the first adder 7. To the second input 8 of the first adder 7 through the first additional recorder a second output 12 of the measuring transducer 3 is connected to the storage device 9 and the output 10 of the first threshold device 11. The third output 13 of the measuring generator 3 is connected through the first trim The lateralization device 14 is connected to the first input 15 of the first divider 16, the second output 17 of the first divider 16 is connected to the second output 18 of the unit 1 of the reference signal through the second differentiating device 19 and the first output 20 of the delay unit 21.

 the output 22 of the delay block 21 is connected via the second additional recorder with a storage device 23 to the first input 24 of the second adder 25. The second input 26 of the second adder 25 is connected via trty an additional recorder with the pressing device 27 and the output 28 of the second threshold device 29 to the third output 30 block 21 delayed The output 31 of the second adder 25 is connected with the first input of the second divider 32. The second input 33 of the second divider 32 is connected with the output of the first adder 7. The output 34 of the second divider 32 is connected to the first input of the comparison unit 35. The second input 36 of the comparator unit 35 is connected to the output of the first divider 16. The output 37 of the comparator unit is connected via a coincidence circuit 38 by a line 39 to the key 40 for issuing the channel calibration coefficient. The first output 41 of the switch 40 is connected to the storage device 42. The second output 43 of the switch 40 is connected to the input 45 of the setpoint 1 of the reference signal via the control circuit 44.

The calibration system of the measuring transducer works as follows.

The reference signal adjuster 1 is adjusted to output the maximum reference signal for the measuring transducer 3 with its lowering value to the minimum. From the setpoint of the reference signal through one output 2, the signal goes to the measuring converter 3. Through the second output 18 of the setting unit of the reference signal, the signal goes to the block 21 of the delay. The output signal from the first output 4 of the measuring transducer 3 is continuously fed to the main recorder with memory 5. From the second output 12 of the measuring transducer 3, the signal goes to the first threshold device 11, which is set to output the maximum output signal of the measuring transducer 3. Maximum output signal of the measuring transducer 3 arrives at the first additional recorder with a memory device 9. From the second output 22 of the delay unit 21, delayed in time to constant th time reference transducer 3 signal is supplied to the second additional register to a memory 23. Device stvom outlet 30 from the third block 21 delays the reference signal is fed to a second threshold device is configured for issuing maksimalnoe transducer 3 for a reference signal from the reference signal 1 Setpoint. A delayed maximum reference signal is fed to a third additional register with a memory device 27. In the first adder 7, the maximum output signal and the current output signals of the measuring converter 3 are continuously summed. In the second adder 25, the time delayed constant of the measuring converter 3 is continuously summed maximum and flowing reference signals from the setpoint 1 of the reference signal. In addition, the output signals from the third output 13 of the measuring transducer 3 are differentiated in the first differentiating device 14, and delayed in Bp KieHi. the reference signals through the first output 20 of the delay unit 21 are fed to the second differentiating device 19, where they are also differentiated. The first divider 16 performs a continuous operation of dividing the differentiated output signal of the measuring transducer 3 by a differentiated, time-delayed reference signal from the setpoint 1 of the reference signal. The second divider 32 at the same time implements the division of the total maximum and current output signals of the measuring converter by the total, time delayed, maximum and current reference signals. The signals from the first divider 16 and the second divider 32 arrive at the comparison unit 35, where they are continuously compared. At the moment of equality of the signals, the coincidence circuit 38 generates a signal for the actuation of the key 40 to increase the channel calibration coefficient. When the key is triggered, the signal is stored, which is a measure of the calibration coefficient in the storage device 4 2. In addition, the key 40 acts on the control circuit 44, which generates a signal to stop the operation of the setpoint 1 of the reference signal.

The calibration device establishes and stores the calibration coefficients of the measuring transducers that meet the condition of a linear approximation characteristic with a zero initial signal and with a minimum approximation error for any two points of the characteristic in the operating range. The system has high performance and efficiency, since for a number of measuring transducers, only calibration coefficients for each of the measuring gels are transformed into the memory of the storage device. The performance of the horizontal calibration work is due to the fact that the system is provided with devices for terminating the discrepancies in determining the optimal calibration factor for each measuring transducer. The operation of measuring transducers calibrated by the proposed system is simplified, since the linear dependencies without the free term are used when deciphering the measurement results.

Claims (2)

The invention The calibration device of the measuring converter, containing the reference signal generator, the main recorder with a storage device, characterized in that, in order to improve the accuracy and increase the possibilities of use, two differential devices, a delay unit, two totalizers, three additional recorders with memory are introduced into it. devices, two threshold devices, two dividers, a comparison unit, a coincidence circuit, a key, and a control circuit with one output of the reference transmitter The signal is connected to a measuring converter, the first output of which is connected through a main recorder with a storage device to the first input of the first adder, to the second input which through a first additional recorder with a storage device and the first threshold device is connected to the second output of the measuring converter, the third output of which is through the first differentiating device connected to the first input of the pee divider, the second input of which is connected to the second output of the reference signal setting device and through the second differentiating device and the first output of the delay unit, the second output of which is connected through the second additional recorder with a storage device to the first input of the second adder, the second input of which is connected to the third output of the delay unit through the third additional recorder with a storage device and second threshold the output, the output of the second adder is connected to the first 1 input of the second divider, the second input of which is connected to the output of the first adder, the output of the second divider is connected to the first input One of the comparator unit, the second input is connected to the output of the first divider and the output via a matching circuit is connected to the key for outputting the calibration coefficient of the measuring transducer, the first output of the key is connected to a storage device, and the second output of the key is connected to the reference signal setpoint through a control circuit Sources of information taken into account in the examination . 1, Krivonosov I.I., Electromechanical pressure transducers of high-temperature media, M., Energie, 1975, p. 90, Fig.46. 2. Erler, V., Walter L, Electrical measurements of non-electric quantities by semiconductor strain gauges, Trans. Ed., I.V., Molkov. M ,, Mir, 1974, p.233 fig, 8.18 (prototype /.