JPS6276630U - - Google Patents

Description

[Brief explanation of the drawing]

Figures 1 to 5 of the accompanying drawings relate to an embodiment of the digital thermometer according to this invention, with Figure 1 being an explanatory diagram of its measurement principle, Figure 2 being a functional block diagram, and Figure 3 being a circuit block diagram. , FIG. 4 is a signal timing diagram, and FIG. 5 is a flowchart. 6 is a general basic circuit diagram of a thermocouple, FIG. 7 is a block diagram of a conventional device, and FIG. 8 is a diagram explaining the principle of measurement. In the figure, 21 is a thermocouple, 22 is an A/D converter, 23 is a temperature sensor, 24 is a microcomputer, 25 is a display, 26 is a frequency divider, 27 is a microprocessor, 29 is a ROM, and SW is a switch. be.

Claims (1)

[Scope of Claim for Utility Model Registration] The electromotive force of a thermocouple generated in response to the temperature to be measured and the output from a temperature sensor that detects the reference junction temperature of the thermocouple are digitally converted by an A/D converter, A digital thermometer that displays a measured temperature by correcting the converted data to a linear characteristic includes a switching device that switches and inputs the electromotive force of the thermocouple and the detection output of the temperature sensor to the A/D converter at a predetermined timing. , a first step of replacing the digitally converted value of the temperature sensor output sent from the A/D converter with a linear characteristic consisting of a polygonal line similar to the electromotive force of the thermocouple;
a correction means for adding the output of the first correction means to the digitally converted value of the thermocouple electromotive force; 1. A digital thermometer, comprising a second correction means, and displays the temperature to be measured based on the output from the second correction means.