SU1696909A1 - Temperature gauges calibrating instrument - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to improve the performance and accuracy of calibration of temperature meters. After the recorder finishes recording by the recorder 4 values of the output signals of the sample 2 and 24 temperature meters being checked at the established temperature of the heat chamber 1, the control unit commands the temperature setter 14 to set the new temperature of the heat chamber 1. At the moment of reaching the specified temperature, the pulse former the signal from the output of the temperature controller 5 switches on the time relay 7. Time relay 7 using the element OR 8 and trigger 9 starts the recorder 4 in the registration mode, after which the control unit 13 sets the new temperature of the heat chamber 1. 3 Il.

Description

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The invention relates to a measuring technique and may find application in the creation of calibration equipment,

The aim of the invention is to improve the performance and accuracy of calibration.

FIG. 1 shows a block diagram of the device; in fig. 2 is a block diagram of a signal conditioner; in fig. 3 is a block diagram of a control unit.

The device (Fig. 1) contains a heat chamber 1 with built-in heaters, an exemplary temperature meter 2 with a thermal converter 3 placed in the chamber 1 for measuring the temperature inside the chamber, the recorder 4, the temperature controller 5, the driver 6 signals, the time relay 7, the OR element 8, the trigger 9, the first element 10, the pulse counter 11, the second element 12, the control unit 13, the temperature setpoint 14, the switch 15 and the start button 16.

The signal conditioner 6 (FIG. 2) contains a circuit for eliminating contact bounce, element 18 and trigger 19. Time relay 7 includes a pulse generator and counters (not shown) counting the pulses from the generator. The signals from the output of the pulse generator of the time relay 7 arrive at the input of the element I 12, and the signal for filling the counters of the relay 7 to the input of the element OR 8. The switch 15 is designed to connect the heaters of the heat chamber 1 to the power network. Its structure is determined by the power and the switching circuit of the heating elements.

The control unit 13 (Fig. 3) contains a pulse counter 20, a decoder 21, converts the binary code of the counter 20 into a decimal, an amplifier block 22 for amplifying the outputs of the decoder 21 and a relay block 23. At the same time, the control inputs of each relay included in block 23 are connected via power amplifiers to the corresponding outputs of the decoder 21, and the outputs (the corresponding contacts of the relay) are connected to the input of temperature setpoint 14.

The device works as follows.

Thermocouples of turnable temperature meters 24 are placed in heat chamber 1, and the outputs of temperature meters are connected to the inputs of recorder 4 (in Fig. 1, one temperature measureable is shown). After loading the thermocouples, the signal from the Start button is triggered, while the blocks 13, 6, 7 and 11 are set to the initial state, and the output signal of the trigger 9 forms an enable signal to one of the second turns of the And 12 element. Through the And 12 element Starting pulses from the time relay 7 output to the recorder 4 and the counter 14 begin to flow. When each pulse arrives, the recorder 4 records the value of the input signals from the reference and calibrated temperature meters. The number of registrations is determined by the capacity of the counter 11.

After filling the counter 11, at its output a filling signal is generated of the counter, which passes through the second element 10 to the input of the trigger 9, translation

him to another steady state. As a result of triggering the trigger 9, the element And 12 ceases to pass the trigger pulses. At the same time, a pulse from the output of the element 10 is supplied to the control unit 13, which changes the temperature setpoint value at the temperature setpoint adjuster 14 of the temperature controller 5. By the signal from the output of the controller 5, the switch 15 turns on all the heaters

heat chambers 1, which ensures quick heating of heat chambers 1 and reaching a predetermined temperature. As soon as the temperature in the chamber reaches the set temperature, the driver 6 according to a signal from the controller 5

temperature gives a signal to the switch 15, which turns off all the powerful heaters and leaves only the supporting heater turned on and off by the controller 5, thus maintaining the set temperature. At the moment when the set temperature reaches the signal from the signal generator 6, the time relay is also started for the time interval required for completion

transient process in the heat chamber and the heating of thermal converters of the temperature measuring instruments under test.

At the end of the exposure time from the output of the relay 7 time signal is given through

the element OR 8 on the trigger 9, the triggering recorder 4 in the registration mode of the current parameters, after which the device goes from the next temperature level, and so on, until

passed the entire temperature range.

A signal proportional to the temperature inside the heat chamber. 1 may be fed to the input of the temperature controller 5 from the output of the reference temperature meter 2 or

with its thermal converter.

Claims (1)

The invention of the device for calibration of temperature meters, containing a heat chamber with heaters, an exemplary meter temperature controller, the input of which is connected to the reference temperature meter, and the control input is connected to the output of the temperature setpoint, the switch, the first input of which is connected to the first output of the temperature regulator, and the outputs are connected to heaters, characterized in that in order to improve performance and accuracy of verification, a signal driver, a time relay, an OR element, a Start button, two AND elements, a trigger, a pulse counter, a control unit and a recorder, whose first input is connected, are entered into it. with the output of the reference temperature meter, and the control input with the input of the pulse counter, the first input of the first element And and the output of the second element And, From 5l.5K com. 15 From 6l. 8 Fig2 the first input of which is connected to the trigger output, and the second input is connected to the first output of the time relay, the second output of which is connected to the first input of the element OR, and the first time relay input is connected to the first output of the signal conditioner, the second output of which is connected to the second input of the switch, and the second input to the first input of the trigger, the second input of the time relay, the second input of the counter and the output of the OR element, the second input of which is connected to output of the Start button and the first input of the control unit, the output of which is connected to the setpoint temperature, and the second input is connected to the second input of the trigger and the output of the first element And, the second input of which is connected to the output of the pulse counter. to 6l. TO