SU1647263A1 - Indicator device - Google Patents

Abstract

This invention relates to a measurement technique and can be used in digital devices. Indicating devices are known that contain digital indicators connected to the output of the control circuit. The purpose of the invention is to expand the functionality of the display device. The display device contains a digital liquid crystal indicator 1, the segments of digits and decimal points of which are connected to the outputs of the indication control unit 2, the first control inputs of which are connected to the outputs of the analog-digital converter 3, the second control inputs of the block 2 are connected to the first output of the clock pulse generator , the second output of which is connected to the common electrode of the digital liquid crystal indicator, the block 6 controls the order of the displayed value. An element 5 is entered into the device, the first inputs of which are connected to the outputs of block 6, the second inputs are connected to the information input of the first monitored parameter, and the output is connected to the third control inputs of block 2, key 8, the control input of which is connected to the information inputs of the second monitored parameter and the output is connected to the control input of the generator 4. 1 sludge. W ё

Description

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This invention relates to a measurement technique and can be used in digital measurement instruments.

The purpose of the invention is to expand the functionality by indicating additional parameters.

The drawing shows a functional diagram of the display device.

The device consists of a digital indicator 1, the segments of which are connected to the output of the indication control unit 2, the first control inputs of the digit segments of which are connected to the analog-digital converter 3, and the second to the first output of the generator 4 clock pulses, the second output of which is connected to the common indicator electrode 1, elements 5, the outputs of which are connected to the third control inputs of the decimal segments of the display control unit 2, and the first inputs to the block 6 controlling the order of the displayed value, the second inputs Are the first information input 7 of the display device and the key 8, which controls the frequency of the clock generator 4 connected to its frequency-dependent elements, the control input of which is the second information input 9 of the display device.

The device works as follows.

An analog-to-digital converter (ADC) 3 converts the input DC voltage into a seven-segment code and directly controls the digital indicator. The output code of the A / D converter 3 is fed to the first inputs of the indication control unit 2. The second inputs of block 2 receive a signal from the first (non-inverse) generator output of 4 clock pulses. Its second (inverse) output is connected to the common electrode of the indicator 1. When the ADC 3 arrives at the input of block 2, a logical zero signal from the clock generator 4 is fed to the output of block 2 without inversion. The signals on the common electrode of the indicator 1 and on the corresponding segment become inverse, i.e. a potential difference arises between them and the segment becomes visible. Otherwise, the segment remains invisible. Similarly, the segments of the decimal points of the indicator 1 from the block 6 controlling the order of the displayed value are controlled through the elements AND 5. This block performs the role of a switch of the measurement limits. In normal mode, the second inputs of the And 5 elements receive a logical unit signal from the overload control circuit of the instrument's amplifier stages, and on the indicator 1, depending on the selected measurement limit, the switch of unit 6 displays one corresponding segment of the decimal point indicating the order of the measured value .

If the monitored parameter exceeds the set value, the control circuit outputs to the input 7 a logical zero signal, which through elements 5 includes

0 at the same time all segments of decimal points of indicator 1. Thus, the instrument operator receives information about the need to move to another, more rough measurement limit. In normal mode, the frequency

The 5 clock generator 4 is chosen such that, due to the inertia of the vision, there are no blinking digits, i.e. more than 16 Hz. If at some point in time at the output of the comparator there is a logic zero level,

0 in accordance with the truth table, a multiplexer connects to the outputs X and Y the first inputs X1 and Y1. A positive reference voltage source is connected to the comparator's inverting input.

5 directly, and to the non-inverting one through the NS-chain.

When capacitor C is charged, the signal at the output of the comparator will switch to the state of a logical unit and the capacitor

0 will start reloading. When the battery discharge control circuit is triggered, input of switch 8 is sent to input 9. In this case, an additional capacitor is connected to capacitor C and the frequency of generator 4 decreases, the numbers on indicator 1 begin to flash, which signals the device operator to replace the power batteries.

Claims (1)

Invention Formula 0 A display device containing a display control unit, a clock pulse generator, a control unit for the order of the displayed value, an analog-to-digital converter, a digital 5 indicator, digit segments and decimal points of which are connected to the outputs of the indication control unit, the first control inputs of which are connected to the outputs of the analog-digital converter, the second control inputs of the indication control unit are connected to the first output of the clock generator, the second output of which is connected with a common electrode of a digital indicator, which differs5 with the fact that, in order to extend the functionality by indicating additional parameters, a key, elements And in the number n are entered About the number of display elements of the order, the first inputs of which are connected to the outputs of the unit pack displaying the indicated indication control magnitude, the control input us, the second inputs are connected to the first key connected to the second information the information input of the device with the india-input of the display device, and the output of the sub-enclosure. And the outputs of the elements And are connected by keys to the control input of the generator the third control inputs of the clock pulse block 5.