The temperature control meter is an integrated intelligent temperature control instrument that uses a fully digital integrated design. It has programmable temperature curve or fixed-point constant temperature control, multiple PID adjustments, output power limiting curve programming, manual/automatic switching, soft Startup, alarm switch output, real-time data query, communication with computer and other functions, the composition and principle of digital display temperature control meter The temperature control instrument is an integrated intelligent temperature control instrument that uses a fully digital integrated design and has a temperature curve Programmable or fixed-point constant temperature control, multiple PID adjustment, output power limiting curve programming, manual/automatic switching, soft start, alarm switch output, real-time data query, communication with computer and other functions, digital display temperature meter and ZK thyristor voltage The regulator combines two into one, integrating temperature measurement, adjustment, and driving. The meter directly outputs the thyristor trigger signal, which can drive all kinds of thyristor loads.

Principle: The digital display meter first converts the continuously changing analog quantity into the intermittently changing digital quantity (A/D conversion), and then the counter (if the input signal is a digital quantity, then the counter directly), registers, The decoder is then displayed on the LED digital tube.

In fact, most digital display meters are mainly based on voltmeters. A large number of physical quantities are transformed into corresponding electrical signals after sensing and transmission. The input part of the meter processes these electrical signals into regular voltage signals, so The main body of most digital meters is just a voltmeter, the difference lies in the input conversion part. Introduction:

With the continuous development of digital technology and microcomputer technology, digital display meters and new display and recording instruments centered on single-chip microcomputers are more and more widely used in the fields of industrial automation and industrial control. The digital display meter, like the pointer meter, is matched with various sensors and transmitters to measure electricity, pressure, level, liquid level, flow, temperature, etc., and directly display the measured results in digital form. Composition:

A digital display meter should have three parts: A/D conversion, nonlinear compensation and scale conversion. Scale conversion: There is often a proportional relationship between the measured value and the engineering value. The digital display should not display the input value, but the actual engineering value, so the scale conversion is required. Generally, the display range of the digital display meter can be set in the whole range.

Of course, although the principle and composition of the digital display meter are relatively simple, it is not easy to do it well. Many factors will affect the quality of the meter, such as design ideas, processing details, and component selection. A/D conversion: Convert analog quantity into digital quantity, there is a special single chip.

Non-linear compensation: There is a nonlinear relationship between most of the measured parameters and the displayed value. In order to eliminate the nonlinear error, a nonlinear compensation circuit is added to the meter. Commonly used methods are: analog nonlinear compensation method, nonlinear digital-to-analog conversion compensation method, digital nonlinear compensation method, etc.