CN105699007A - Resistance vacuum transmitter - Google Patents
Resistance vacuum transmitter Download PDFInfo
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- CN105699007A CN105699007A CN201610130401.8A CN201610130401A CN105699007A CN 105699007 A CN105699007 A CN 105699007A CN 201610130401 A CN201610130401 A CN 201610130401A CN 105699007 A CN105699007 A CN 105699007A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L21/00—Vacuum gauges
- G01L21/10—Vacuum gauges by measuring variations in the heat conductivity of the medium, the pressure of which is to be measured
- G01L21/12—Vacuum gauges by measuring variations in the heat conductivity of the medium, the pressure of which is to be measured measuring changes in electric resistance of measuring members, e.g. of filaments; Vacuum gauges of the Pirani type
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Abstract
The invention discloses a resistance vacuum transmitter, which comprises a resistance vacuum gauge tube, an electrical bridge device, an amplifying device, an A/D analog-to-digital conversion device, a power supply device, a micro-control device and a display device. According to the technical scheme of the invention, the resistance vacuum transmitter is small in size and light in weight. The analog output signal of the resistance vacuum transmitter is good in linearity control. When a user adopts the analog signal, the current vacuum degree can be accurately reflected. The micro-control device judges whether to be in a decoupling state or not according to the acquired signal of a decoupling device and then displays the judgment result via a nixie tude. Therefore, the resistance vacuum transmitter is very convenient to use for users.
Description
Technical field
The present invention relates to technical field of measuring equipment, more particularly, it relates to a kind of vacuum measuring device。
Background technology
The features such as resistance vacuum transmitter is a kind of vacuum measurement instrument, has stability height within the scope of its measurement, measures accurately, can measure continuously, long service life, are widely used in the fields such as Aeronautics and Astronautics, nuclear energy, electronics and electrical equipment manufacture。
There are the following problems for existing resistance vacuum transmitter: one, existing resistance vacuum transmitter vacuum probe and measure instrument be separate, it is connected with cable between the two, cause that measuring instrument body is long-pending bigger, weight is bigger, use in little space is restricted, it is impossible to meet some fields that space and weight are had higher requirements；Two, existing resistance vacuum transmitter analog signal output Linear Control is bad, and user takes analogue signal can not reflect current vacuum level accurately。Three, the not disconnected coupling function of existing resistance vacuum transmitter, user can not judge that resistance vacuum transmitter is shown that current vacuum level and still regulates bad or be not switched under vacuum conditions。
Summary of the invention
In view of this, the present invention provides a kind of resistance vacuum transmitter, comprising: resistance vacuum is regulated, bridge unit, amplifying device, A/D analog-digital commutator, supply unit, micromonitor system, display device；
Described bridge unit is regulated with resistance vacuum and is connected, in order to regulate the operating current providing stable to resistance vacuum；
Described amplifying device is connected with bridge unit and A/D analog-digital commutator respectively, and the analogue signal in order to bridge unit is exported is transmitted to A/D analog-digital commutator after amplifying；
Described A/D analog-digital commutator is connected with micromonitor system, converts digital signal in order to the analogue signal that amplifying device is exported；
Described micromonitor system is connected with display device, in order to export after being processed by the digital signal that described A/D analog-digital commutator exports to display device to show the vacuum of test；
Described display device includes charactron and display chip。
Described resistance vacuum transmitter, in its display device display chip to be MAX7219, charactron be 7 sections green for cloudy charactrons；Wherein:
The DIN foot of described MAX7219 chip, CS foot, CLK foot are connected with micromonitor system respectively, ISET foot is connected with positive 5V by a resistance, and DIG0 foot, DIG4 foot, DIG2 foot, DIG3 foot, DIG5 foot, DIG1 foot, SEGA foot, SEGF foot, SEGB foot, SEGG foot, SEGC foot, SEGE foot, SEGDP foot, SEGD foot are green with 7 sections respectively to be connected for cloudy charactron。
Described resistance vacuum transmitter, described amplifying device adopts the peripheral circuit of series voltage negtive backword, so can improve the stability of amplifying circuit。
Described resistance vacuum transmitter, described amplifying device includes LM358 chip, the controlled source of stable pressure of TL431, zero potential device ZR, full scale potentiometer FR and resistance R25；The positive input that the first order of described LM358 chip is amplified is connected with resistance R25, the reverse input end that the first order is amplified is connected with bridge unit, the reverse input end that the outfan that the first order is amplified amplifies with the second level is connected, the reverse input end amplified in the second level is connected with the outfan of the controlled source of stable pressure of TL431, and the outfan that the second level is amplified is connected with full scale potentiometer FR and A/D analog-digital commutator respectively；1 foot of described zero potential device ZR is connected with SGND, and 2 feet of zero potential device ZR are connected with the common port of SGND and C3, and 3 feet of zero potential device ZR are connected with resistance R22。
Described resistance vacuum transmitter, described A/D analog-digital commutator includes LM331 chip。
Described resistance vacuum transmitter, described bridge unit includes HA17741 chip, BH56 transistor, four arm electrical bridge resistance, the first input resistance R2, the second input resistance R14, protective resistance R15 and protection diode D1；Wherein, forward and reverse input of described HA17741 chip is connected with the second input resistance R2 and the first input resistance R14 respectively; the common port that first input resistance R14 regulates with the R11 in four arm electrical bridge and resistance vacuum is connected; the other end of the second input resistance R2 is connected with the common port of resistance R17 and resistance R18; the outfan of described HA17741 chip is connected with the base stage of BH56 transistor; the emitter stage of BH56 is connected with the common port of R6 and R16, and the colelctor electrode of BH56 is connected with protective resistance R15；The positive pole of protection diode D1 is connected with the resistance R6 of four arm electrical bridge, and the negative pole of protection diode D1 is connected with the voltage of 15V。
Described resistance vacuum transmitter also includes disconnected coupling device, for the break-make of the filament of monitoring resistor vacuum gauge；Described disconnected coupling device includes optocoupler P181, resistance R1, resistance R3 and resistance R4；Wherein, the 1 foot ground connection of described optocoupler P181,2 feet of described optocoupler P181 are connected with resistance R3, the other end of R3 resistance is connected with the common port of the base stage of BH56 and resistance R4, another termination DC+15V voltage of resistance R4, the 3 foot ground connection of the P181 of described optocoupler, 4 feet are connected with resistance R1 and micromonitor system respectively。
Linear in order to control resistance vacuum transmitter analog signal output, described resistance vacuum transmitter also includes analogue output unit；Micromonitor system receives and calculates vacuum after the digital voltage signal of analog-digital commutator collection, output to display device displays, and export to analogue output unit simultaneously, producing linear analog signal by analogue output unit, the analogue signal of described analogue output unit output can be current signal or voltage signal。
The analogue output unit of described resistance vacuum transmitter includes TL5615 chip, HA17741 operational amplifier, 9013NPN type audion, 9012PNP type audion, the first adjustable potentiometer W1 and the second adjustable potentiometer W2, wherein:
The DIN foot of described TL5615 chip, SCLK foot, CS foot are connected with micromonitor system respectively, 2 feet of REFN foot and the first adjustable potentiometer W1 are connected, 1 foot of OUT foot and the second adjustable potentiometer W2 is connected, 1 foot of the first adjustable potentiometer W1 is connected with the AGND foot of TL5615 chip, 3 feet of the first adjustable potentiometer W1 connect 2.5V voltage, 1 foot of the second adjustable potentiometer W2 and 2 foot short circuits；
The forward of described HA17741 enters through resistance R41 and R48 and is connected with+15V, GND foot respectively, and 3 feet reversely entering through resistance R46 and the second adjustable potentiometer W2 are connected, and the outfan of described HA17741 is connected with 1 foot of described 9012PNP type audion；
3 feet of the described 9012PNP type audion reverse input end phase by resistance R47 and described HA17741；
2 feet of described 9012PNP type audion are connected with 1 foot of described 9013NPN type audion；
2 feet of described 9013NPN type audion are connected with positive 15V voltage by resistance R40；
3 feet of described 9013NPN type audion can pass through resistance R38 or directly be connected with SGND foot。
Described resistance vacuum transmitter also includes communicator, and described communicator is connected with micromonitor system, it is achieved the communication of resistance vacuum transmitter and peripheral equipment, communicator can be RS485 here。
Resistance vacuum transmitter volume of the present invention is little；Lightweight；The Linear Control of analog output signal is better；When user takes analogue signal, it is possible to reflect current vacuum level accurately；Micromonitor system can decide whether be in disconnected coupling state and pass through numeral method out according to the signal that disconnected coupling device is collected, and brings great convenience to the use of user。
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings。
A kind of resistance vacuum structure of transmitter schematic diagram that Fig. 1 provides for the embodiment of the present invention；
The circuit diagram of a kind of resistance vacuum transmitter that Fig. 2 provides for the embodiment of the present invention；
The circuit diagram of a kind of bridge unit that Fig. 3 provides for the embodiment of the present invention；
The circuit diagram of the disconnected coupling device of a kind of resistance vacuum transmitter that Fig. 4 provides for the embodiment of the present invention；
The circuit diagram of the amplifying device of a kind of resistance vacuum transmitter that Fig. 5 provides for the embodiment of the present invention；
The circuit diagram of the analog-digital commutator of a kind of resistance vacuum transmitter that Fig. 6 provides for the embodiment of the present invention；
The circuit diagram of the micromonitor system of a kind of resistance vacuum transmitter that Fig. 7 provides for the embodiment of the present invention；
The circuit diagram of the simulation output-controlling device of a kind of resistance vacuum transmitter that Fig. 8 provides for the embodiment of the present invention；
The circuit diagram of the communicator of a kind of resistance vacuum transmitter that Fig. 9 provides for the embodiment of the present invention；
The circuit diagram of the display device of a kind of resistance vacuum transmitter that Figure 10 provides for the embodiment of the present invention；
Another resistance vacuum structure of transmitter schematic diagram that Figure 11 embodiment of the present invention provides；
The another kind of resistance vacuum structure of transmitter schematic diagram that Figure 12 embodiment of the present invention provides；
Another resistance vacuum structure of transmitter schematic diagram that Figure 13 embodiment of the present invention provides。
Detailed description of the invention
There are the following problems for existing resistance vacuum transmitter: one, existing resistance vacuum transmitter vacuum probe and measure instrument be separate, it is connected with cable between the two, cause that measuring instrument body is long-pending bigger, weight is bigger, use in little space is restricted, it is impossible to meet some fields that space and weight are had higher requirements；Two, existing resistance vacuum transmitter analog signal output Linear Control is bad, and user takes analogue signal can not reflect current vacuum level accurately。Three, the not disconnected coupling function of existing resistance vacuum transmitter, user can not judge that resistance vacuum transmitter is shown that current vacuum level under vacuum conditions is regulate bad or be not switched on。In order to solve the problems referred to above, the embodiment of the present invention provides a kind of resistance vacuum transmitter, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments。Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into protection scope of the present invention。
Refer to Fig. 1 a kind of resistance vacuum transmitter provided for the embodiment of the present invention, comprising: resistance vacuum is regulated, bridge unit, amplifying device, A/D analog-digital commutator, supply unit, micromonitor system (micromonitor system adopted in the present embodiment is STC89C54RD), display device；
Described bridge unit is regulated with resistance vacuum and is connected, in order to regulate the operating current providing stable to resistance vacuum；
Described amplifying device is connected with bridge unit and A/D analog-digital commutator respectively, and the analogue signal in order to bridge unit is exported is transmitted to A/D analog-digital commutator after amplifying；
Described A/D analog-digital commutator is connected with micromonitor system, converts digital signal in order to the analogue signal that amplifying device is exported；
Described micromonitor system is connected with display device, in order to export after being processed by the digital signal that described A/D analog-digital commutator exports to display device to show the vacuum of test；
Described display device includes charactron and display chip。
Described resistance vacuum transmitter, in its display device display chip to be MAX7219, charactron be 7 sections green for cloudy charactrons；Wherein:
The DIN foot of described MAX7219 chip, CS foot, CLK foot are connected with micromonitor system respectively, ISET foot is connected with positive 5V by a resistance, and DIG0 foot, DIG4 foot, DIG2 foot, DIG3 foot, DIG5 foot, DIG1 foot, SEGA foot, SEGF foot, SEGB foot, SEGG foot, SEGC foot, SEGE foot, SEGDP foot, SEGD foot are green with 7 sections respectively to be connected for cloudy charactron。
Described resistance vacuum transmitter, described amplifying device adopts the peripheral circuit of series voltage negtive backword, so can improving the stability of amplifying circuit, described amplifying device includes LM358 chip, the controlled source of stable pressure of TL431, zero potential device ZR, full scale potentiometer FR and resistance R25；The positive input that the first order of described LM358 chip is amplified is connected with resistance R25, the reverse input end that the first order is amplified is connected with bridge unit, the reverse input end that the outfan that the first order is amplified amplifies with the second level is connected, the reverse input end amplified in the second level is connected with the outfan of the controlled source of stable pressure of TL431, and the outfan that the second level is amplified is connected with full scale potentiometer ZR and A/D analog-digital commutator respectively；1 foot of described zero potential device ZR is connected with SGND, and 2 feet of zero potential device ZR are connected with the common port of SGND and C3, and 3 feet of zero potential device ZR are connected with resistance R22。
Described resistance vacuum transmitter, described bridge unit includes HA17741 chip, BH56 transistor, four arm electrical bridge resistance, the first input resistance R2, the second input resistance R14, protective resistance R15 and protection diode D1；Wherein, forward and reverse input of described HA17741 chip is connected with the second input resistance R2 and the first input resistance R14 respectively; the common port that first input resistance R14 regulates with the R11 in four arm electrical bridge and resistance vacuum is connected; the other end of the second input resistance R2 is connected with the common port of resistance R17 and resistance R18; the outfan of described HA17741 chip is connected with the base stage of BH56 transistor; the emitter stage of BH56 is connected with the common port of R6 and R16, and the colelctor electrode of BH56 is connected with protective resistance R15；The positive pole of protection diode D1 is connected with the resistance R6 of four arm electrical bridge, and the negative pole of protection diode D1 is connected with the voltage of 15V。
Described resistance vacuum transmitter also includes disconnected coupling device, for the break-make of the filament of monitoring resistor vacuum gauge；Described disconnected coupling device includes optocoupler P181, resistance R1, resistance R3 and resistance R4；Wherein, the 1 foot ground connection of described optocoupler P181,2 feet of described optocoupler P181 are connected with resistance R3, the other end of R3 resistance is connected with the common port of the base stage of BH56 and resistance R4, another termination DC+15V voltage of resistance R4, the 3 foot ground connection of the P181 of described optocoupler, 4 feet are connected with resistance R1 and micromonitor system respectively。
Linear in order to control resistance vacuum transmitter analog signal output, the resistance vacuum transmitter described in the present embodiment also includes analogue output unit；Micromonitor system receives and calculates vacuum after the digital voltage signal of analog-digital commutator collection, output to display device displays, and export to analogue output unit simultaneously, producing linear analog signal by analogue output unit, the analogue signal of described analogue output unit output can be current signal or voltage signal。
The analogue output unit of the resistance vacuum transmitter of the present embodiment includes TL5615 chip, HA17741 operational amplifier, 9013NPN type audion, 9012PNP type audion, the first adjustable potentiometer W1 and the second adjustable potentiometer W2, wherein:
The DIN foot of described TL5615 chip, SCLK foot, CS foot are connected with micromonitor system respectively, 2 feet of REFN foot and the first adjustable potentiometer W1 are connected, 1 foot of OUT foot and the second adjustable potentiometer W2 is connected, 1 foot of the first adjustable potentiometer W1 is connected with the AGND foot of TL5615 chip, 3 feet of the first adjustable potentiometer W1 connect 2.5V voltage, 1 foot of the second adjustable potentiometer W2 and 2 foot short circuits；
The forward of described HA17741 enters through resistance R41 and R48 and is connected with+15V, GND foot respectively, and 3 feet reversely entering through resistance R46 and the second adjustable potentiometer W2 are connected, and the outfan of described HA17741 is connected with 1 foot of described 9012PNP type audion；
3 feet of the described 9012PNP type audion reverse input end phase by resistance R47 and described HA17741；
2 feet of described 9012PNP type audion are connected with 1 foot of described 9013NPN type audion；
2 feet of described 9013NPN type audion are connected with positive 15V voltage by resistance R40；
3 feet of described 9013NPN type audion can pass through resistance R38 or directly be connected with SGND foot。
Resistance vacuum transmitter described in the present embodiment also includes communicator, and described communicator is connected with micromonitor system, it is achieved the communication of resistance vacuum transmitter and peripheral equipment, the communicator described in the present embodiment can be RS485。
The embodiment of the present invention can also adopt following form structure:
The first embodiment is the structure described in Figure 11, and described resistance vacuum transmitter is regulated by resistance vacuum, bridge unit, amplifying device, A/D analog-digital commutator, supply unit, micromonitor system, display device form；The structure of its building block is identical with above-described embodiment with annexation。
The second embodiment is the structure described in Figure 12, and described resistance vacuum transmitter is regulated by resistance vacuum, bridge unit, amplifying device, A/D analog-digital commutator, supply unit, micromonitor system, display device and disconnected coupling device form；The structure of its building block is identical with above-described embodiment with annexation。
The third embodiment is the structure described in Figure 13, and described resistance vacuum transmitter is regulated by resistance vacuum, bridge unit, amplifying device, A/D analog-digital commutator, supply unit, micromonitor system, display device, disconnected coupling device and analogue output unit form。The structure of its building block is identical with above-described embodiment with annexation。
Resistance vacuum transmitter volume described in the embodiment of the present invention is little；Lightweight；The Linear Control of analog output signal is better；When user takes analogue signal, it is possible to reflect current vacuum level accurately；Micromonitor system can decide whether be in disconnected coupling state and pass through numeral method out according to the signal that disconnected coupling device is collected, and brings great convenience to the use of user。
Claims (17)
1. a resistance vacuum transmitter, is characterised by, comprising: resistance vacuum is regulated, bridge unit, amplifying device, A/D analog-digital commutator, supply unit, micromonitor system, display device；
Described bridge unit is regulated with resistance vacuum and is connected；
Described amplifying device is connected with bridge unit and A/D analog-digital commutator respectively, and the analogue signal in order to bridge unit is exported is transmitted to A/D analog-digital commutator after amplifying；
Described A/D analog-digital commutator is connected with micromonitor system, converts digital signal in order to the analogue signal that amplifying device is exported；
Described micromonitor system is connected with display device, in order to export after being processed by the digital signal that described A/D analog-digital commutator exports to display device to show the vacuum of test；
Described display device includes charactron and display chip。
2. resistance vacuum transmitter as claimed in claim 1 a kind of, it is characterised in that in described display device display chip to be MAX7219, charactron be 7 sections green for cloudy charactron；Wherein:
The DIN foot of described MAX7219 chip, CS foot, CLK foot are connected with micromonitor system respectively, ISET foot is connected with positive 5V by a resistance, and DIG0 foot, DIG4 foot, DIG2 foot, DIG3 foot, DIG5 foot, DIG1 foot, SEGA foot, SEGF foot, SEGB foot, SEGG foot, SEGC foot, SEGE foot, SEGDP foot, SEGD foot are green with 7 sections respectively to be connected for cloudy charactron。
3. a kind of resistance vacuum transmitter as claimed in claim 1, it is characterised in that described amplifying device adopts the peripheral circuit of series voltage negtive backword。
4. a kind of resistance vacuum transmitter as claimed in claim 3, it is characterised in that described amplifying device includes LM358 chip, the controlled source of stable pressure of TL431, zero potential device ZR, full scale potentiometer FR and resistance R25；The positive input that the first order of described LM358 chip is amplified is connected with resistance R25, the reverse input end that the first order is amplified is connected with bridge unit, the reverse input end that the outfan that the first order is amplified amplifies with the second level is connected, the reverse input end amplified in the second level is connected with the outfan of the controlled source of stable pressure of TL431, and the outfan that the second level is amplified is connected with full scale potentiometer FR and A/D analog-digital commutator respectively；1 foot of described zero potential device ZR is connected with SGND, and 2 feet of zero potential device ZR are connected with the common port of SGND and C3, and 3 feet of zero potential device ZR are connected with resistance R22。
5. a kind of resistance vacuum transmitter as claimed in claim 1, it is characterised in that described A/D analog-digital commutator includes LM331 chip。
6. a kind of resistance vacuum transmitter as claimed in claim 4, it is characterised in that described A/D analog-digital commutator includes LM331 chip。
7. a kind of resistance vacuum transmitter as claimed in claim 1; it is characterized in that, described bridge unit includes HA17741 chip, BH56 transistor, four arm electrical bridge resistance, the first input resistance R2, the second input resistance R14, protective resistance R15 and protection diode D1；Wherein, forward and reverse input of described HA17741 chip is connected with the second input resistance R2 and the first input resistance R14 respectively; the common port that first input resistance R14 regulates with the R11 in four arm electrical bridge and resistance vacuum is connected; the other end of the second input resistance R2 is connected with the common port of resistance R17 and resistance R18; the outfan of described HA17741 chip is connected with the base stage of BH56 transistor; the emitter stage of BH56 is connected with the common port of R6 and R16, and the colelctor electrode of BH56 is connected with protective resistance R15；The positive pole of protection diode D1 is connected with the resistance R6 of four arm electrical bridge, and the negative pole of protection diode D1 is connected with the voltage of 15V。
8. a kind of resistance vacuum transmitter as claimed in claim 6; it is characterized in that, described bridge unit includes HA17741 chip, BH56 transistor, four arm electrical bridge resistance, the first input resistance R2, the second input resistance R14, protective resistance R15 and protection diode D1；Wherein, forward and reverse input of described HA17741 chip is connected with the second input resistance R2 and the first input resistance R14 respectively; the common port that first input resistance R14 regulates with the R11 in four arm electrical bridge and resistance vacuum is connected; the other end of the second input resistance R2 is connected with the common port of resistance R17 and resistance R18; the outfan of described HA17741 chip is connected with the base stage of BH56 transistor; the emitter stage of BH56 is connected with the common port of R6 and R16, and the colelctor electrode of BH56 is connected with protective resistance R15；The positive pole of protection diode D1 is connected with the resistance R6 of four arm electrical bridge, and the negative pole of protection diode D1 is connected with the voltage of 15V。
9. a kind of resistance vacuum transmitter as claimed in claim 1, it is characterised in that described resistance vacuum transmitter also includes disconnected coupling device, for the break-make of the filament of monitoring resistor vacuum gauge；Described disconnected coupling device includes optocoupler P181, resistance R1, resistance R3 and resistance R4；Wherein, the 1 foot ground connection of described optocoupler P181,2 feet of described optocoupler P181 are connected with resistance R3, the other end of R3 resistance is connected with the common port of the base stage of BH56 and resistance R4, another termination DC+15V voltage of resistance R4, the 3 foot ground connection of the P181 of described optocoupler, 4 feet are connected with resistance R1 and micromonitor system respectively。
10. a kind of resistance vacuum transmitter as claimed in claim 8, it is characterised in that described resistance vacuum transmitter also includes disconnected coupling device, for the break-make of the filament of monitoring resistor vacuum gauge；Described disconnected coupling device includes optocoupler P181, resistance R1, resistance R3 and resistance R4；Wherein, the 1 foot ground connection of described optocoupler P181,2 feet of described optocoupler P181 are connected with resistance R3, the other end of R3 resistance is connected with the common port of the base stage of BH56 and resistance R4, another termination DC+15V voltage of resistance R4, the 3 foot ground connection of the P181 of described optocoupler, 4 feet are connected with resistance R1 and micromonitor system respectively。
11. a kind of resistance vacuum transmitter as claimed in claim 1, it is characterised in that described resistance vacuum transmitter also includes analogue output unit；Micromonitor system receives and calculates vacuum after the digital voltage signal of analog-digital commutator collection, output to display device displays, and export to analogue output unit simultaneously, producing linear analog signal by analogue output unit, the analogue signal of described analogue output unit output can be current signal or voltage signal。
12. a kind of resistance vacuum transmitter as claimed in claim 10, it is characterised in that described resistance vacuum transmitter also includes analogue output unit；Micromonitor system receives and calculates vacuum after the digital voltage signal of analog-digital commutator collection, output to display device displays, and export to analogue output unit simultaneously, producing linear analog signal by analogue output unit, the analogue signal of described analogue output unit output can be current signal or voltage signal。
13. a kind of resistance vacuum transmitter as described in claim 11 or 12, it is characterized in that, described analogue output unit includes TL5615 chip, HA17741 operational amplifier, 9013NPN type audion, 9012PNP type audion, the first adjustable potentiometer W1 and the second adjustable potentiometer W2, wherein:
The DIN foot of described TL5615 chip, SCLK foot, CS foot are connected with micromonitor system respectively, 2 feet of REFN foot and the first adjustable potentiometer W1 are connected, 1 foot of OUT foot and the second adjustable potentiometer W2 is connected, 1 foot of the first adjustable potentiometer W1 is connected with the AGND foot of TL5615 chip, 3 feet of the first adjustable potentiometer W1 connect 2.5V voltage, 1 foot of the second adjustable potentiometer W2 and 2 foot short circuits；
The forward of described HA17741 enters through resistance R41 and R48 and is connected with positive 15V, GND foot respectively, and 3 feet reversely entering through resistance R46 and the second adjustable potentiometer W2 are connected, and the outfan of described HA17741 is connected with 1 foot of described 9012PNP type audion；
3 feet of the described 9012PNP type audion reverse input end phase by resistance R47 and described HA17741；
2 feet of described 9012PNP type audion are connected with 1 foot of described 9013NPN type audion；
2 feet of described 9013NPN type audion are connected with positive 15V voltage by resistance R40；
3 feet of described 9013NPN type audion can pass through resistance R38 or directly be connected with SGND foot。
14. a kind of resistance vacuum transmitter as claimed in claim 1, it is characterised in that described resistance vacuum transmitter also includes communicator, and described communication device is connected with micromonitor system, it is achieved the communication of resistance vacuum transmitter and peripheral equipment。
15. a kind of resistance vacuum transmitter as claimed in claim 13, it is characterised in that described resistance vacuum transmitter also includes communicator, and described communicator is connected with micromonitor system, it is achieved the communication of resistance vacuum transmitter and peripheral equipment。
16. a kind of resistance vacuum transmitter as claimed in claim 15, it is characterised in that described communicator is RS485。
17. a kind of resistance vacuum transmitter as described in 14 16 any claim, it is characterised in that described micromonitor system is STC89C54RD。
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