CN2200175Y

CN2200175Y - Digital meter

Info

Publication number: CN2200175Y
Application number: CN 94214127
Authority: CN
Inventors: 谢仰东
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-06-11
Filing date: 1994-06-11
Publication date: 1995-06-07
Anticipated expiration: 2004-06-11

Abstract

The utility model relates to a digital meter taking luminous diode digitrons as the display screen, two diodes with different luminous colors are arranged in each digitron, and an alarm circuit is composed of a comparator, a driver, an electric relay and luminous diodes in digitrons. When the numerical value of the test parameter changes in different intervals, the display displays signals of different colors, the signals are both numeral signals and alarm signals, and the two kinds of signals form an organic contact, so the alarm signals provided by the utility model is more reliable and more visual.

Description

Digital meter

The utility model relates to a kind of with the digital instrument of light-emitting diodes charactron as display screen.

The basic circuit of digital instrument is made up of sensor, metering circuit, A/D change-over circuit and charactron, its effect is the actual numerical value of a certain measured parameter in the direct display industry process, digital instrument also has some functional circuits that are provided with according to request for utilization, is exactly wherein a kind of for a certain parameter in changing directly provides the warning circuit of indicator signal with the comparative result of a certain setting value for example.This warning circuit is to adopt the design proposal of being made up of comparer, driver, relay and pilot lamp at present, because this warning circuit only output terminal of the metering circuit from basic circuit obtains voltage signal, therefore, the demonstration of pilot lamp is incoherent mutually with the demonstration of charactron.In case when warning circuit broke down, though the charactron parameter value in continue to show changing still, this warning circuit had lost warning function.

The purpose of this utility model provides a kind of digital instrument that alarm signal is contacted directly with the shows signal of charactron.

Solution of the present utility model is to be provided with two light emitting diodes that illuminant colour is different in every charactron, and warning circuit then is made up of the light emitting diode of two kinds of different colors in comparer, driver, relay and the charactron.

Further illustrate detailed content of the present utility model below in conjunction with drawings and Examples.

Fig. 1: frame principle figure of the present utility model;

Fig. 2: the sign picture of charactron;

Fig. 3: the circuit diagram of A/D change-over circuit and charactron part;

The warning circuit circuit diagram of Fig. 4: embodiment one;

The warning circuit circuit diagram of Fig. 5: embodiment two.

The utility model comes down to a kind of digital instrument with warning circuit, be provided with two

light emitting diodes

1 and 2 that illuminant colour is different in every charactron a, b of the present utility model, c, d, e, f, g, the h, and form warning circuit by comparer, driver, relay and two

light emitting diodes

1 and 2 of being located in every charactron a, b, c, d, e, f, g, the h, wherein charactron a, b, c, d, e, f, g anyhow, interior two

light emitting diodes

1 and 2 are respectively with the normally closed contact K in one group of contact in the relay ₁With normally opened contact K ₂Series connection, two light emitting diodes 1 in the point charactron h and 2 are respectively with the normally closed contact K of another group contact in the relay ₁With normally opened contact K ₂Series connection.Warning circuit can be a cover, also can be two cover combinations, and this will be one or two according to the number of the pre-set parameter of needs supervision in using and decide.

Embodiment one: adopt a cover warning circuit, be applicable to that pre-set parameter is one a situation.The quantity that is described comparer, driver and relay respectively is a comparer N, a driver V and a relay J.

Embodiment two: adopt the combination of two cover warning circuits, be applicable to that pre-set parameter is two a situation.The quantity that is described comparer, driver and relay respectively is two comparer N ₁And N ₂, two driver V ₁And V ₂With two relay J ₁And J ₂, and two relay J ₁And J ₂Middle for the moving contact K in one group of contact of charactron a, b, c, d, e, f, g wiring use anyhow ₃Parallel connection is for the kinetic energy point K in another group contact of point charactron h wiring use ₃Also in parallel.

If relay J, J at embodiment one and embodiment two ₁And J ₂In utilize one group of contact again, and known pilot lamp caution scheme is used in the above-described embodiments, so, the utility model just becomes the digital instrument with dual warning way.

Present embodiment adopts 7,017 3 ¹/ ₂The position A/D converter is made the A/D change-over circuit and is controlled four groups of charactron H ₁, H ₂, H ₃, and H ₄, be example with embodiment two now, the process of once warning is described.

When the numerical value of measured parameter does not reach lower limit set value, two cover relay J ₁And J ₂All not conductings, normally closed contact K ₁Closure, light emitting diode 1 follow procedure under the control of A/D change-over circuit is switched on luminous, shows a kind of illuminant colour; When the numerical value of measured parameter reaches lower limit set value, relay J ₁Conducting, its normally opened contact K ₂Closure, at this moment,

light emitting diode

1 and 2 follow procedures are all luminous, show a kind of neutral color; When the numerical value of measured parameter meets or exceeds upper limit set value, relay J ₂Also be switched on its normally opened contact K ₂Closure, at this moment, light emitting diode 1 is turned off the light, and light emitting diode 2 continues luminous, shows another kind of illuminant colour.In general,

light emitting diode

1 and 2 is selected green and red two kinds of illuminant colours respectively for use, and its neutral color is yellow.

According to the character of measured parameter, select suitable sensor and metering circuit, can make the utility model be used for the detection and the demonstration of technological parameters such as temperature, pressure, flow, voltage, electric current, and can reach the purpose of automatic control as required.

The essence of the digital instrument of said structure is to change the digital signal that monochrome shows into digital signal that variable color shows, and with this directly as the alarm signal of warning circuit, therefore, the alarm signal of this digital instrument has homogeneity with digital signal, thereby make alarm signal more reliable, more directly perceived.

Claims

1, a kind of digital instrument with warning circuit, it is characterized in that: every charactron (a, b, c, d, e, f, g, h) be provided with two light emitting diodes (1 that illuminant colour is different in, 2), and by comparer, driver, relay and be located at every charactron (a, b, c, d, e, f, g, h) Nei two light emitting diodes (1,2) form warning circuit, charactron (a anyhow wherein, b, c, d, e, f, g, h) Nei two light emitting diodes (1,2) respectively with normally closed contact (K1) in one group of contact in the relay and normally opened contact (K2) series connection, two light emitting diodes (1 in the point charactron (h), 2) respectively with normally closed contact (K1) and normally opened contact (K in another group contact in the relay ₂) series connection.

2, digital instrument according to claim 1 is characterized in that: the quantity of described comparer, driver and relay respectively is a comparer (N), a driver (V) and a relay (J).

3, digital instrument according to claim 1 is characterized in that: the quantity of described comparer, driver and relay respectively is two comparer (N ₁, N ₂), two driver (V ₁, V ₂) and two relay (J ₁, J ₂), and two relay (J ₁, J ₂) middle for the moving contact (K in one group of contact of charactron (a, b, c, d, e, f, g) wiring use anyhow ₃) parallel connection, for the moving contact (K in another group contact of point charactron (h) wiring use ₃) also in parallel.