SU1545096A1 - Device for measuring high stationary temperatures - Google Patents

Abstract

The invention relates to temperature measurements, can be used to measure temperatures above the maximum allowable for thermal converters, and improves the accuracy of the measurement by reducing the effect of interference. The signal from the output of the analog-digital converter 2 is fed to the first inputs of three comparison circuits of codes 3-5, where it is compared with three codes N ₁ , N ₂ , N ₃ proportional to three specified reference voltages. The comparison circuits of the codes control the keys 9, 10, to the inputs of which a frequency signal is provided from the output of generator 11. A reversible counter 14, a frequency divider 13, a digital divider 16 and a adder 17 generate a code proportional to the measured temperature, which is displayed by the display unit 18. 1 Il.

Description

where U n and U ,, are the values of the output signal, the thermal converter corresponding to the initial and steady-state temperatures of

dy $ b is a heat indicator

inertia thermocouple.

On the transition curve, three reference levels are specified. U4, Ug and U, which correspond to three numbers N5) N g and N 3 installed at the second inputs of the code comparison circuit 3-5, comparing the codes, the first inputs of which receive the output code of the analog-digital converter 2,

Sola system of equations (1), the displayed moments of equality of the output signal of the thermal converter to the specified reference levels

and; ik- (ik-in) e

Ml

(2)

m b (/

Nie T Tt4- ™

which is summed in the adder 17 with the code number N2. removed from the output of the coding device 8.

At the output of the adder 17 receive

.- ". -g "

those. a code that enters the display unit 18 proportional to the measured temperature.

The following measurement can be made only after cooling the thermocouple. Before measuring, the meters must be set to zero.

Claims (1)

Invention Formula A device for measuring high stationary temperatures, comprising thermal converter, two keys, whose information inputs are connected to a pulse generator, a reversible counter, the subtractive input of which is connected to the output of the second key, and the output is connected to the first input of a digital divider, the first adder, the first input of which is connected to the output of a digital divider the first output of the coding device, and the output is connected to a digital display unit, and a frequency divider, characterized in that, in order to improve the measurement accuracy, three comparison circuits are introduced into it dv, pulse counter, code inverter, multiplexer, second adder and analog-to-digital converter, whose input is connected to the output of a thermal converter, and the output is connected to the first inputs of the first, second and third comparison circuits, codes, the second inputs of which are connected respectively to the second, first and the third outputs of the code set, and the outputs are connected respectively 0 five 0 five with the first and second control inputs of the first key and the first control input of the second key, the output of which is connected to the second information input of the multiplexer, the first information input of which is connected to the output of the first key and the summing input of the reversing counter, is connected to the second control the first key input and the first control input of the second key, the second address input is connected to the first control input of the first key, and the output is connected to the first input of the frequency divider, The output of which is connected to the pulse counter, and the second input is connected to the output of the first adder, the first input of which is connected to the first output of the code set, and the second input is connected to the second output of the code set via the code inverter, the output of the pulse counter is connected to the second digital divide .