CN2687689Y - Portable signal generation calibrating instrument - Google Patents
Portable signal generation calibrating instrument Download PDFInfo
- Publication number
- CN2687689Y CN2687689Y CN 200320104684 CN200320104684U CN2687689Y CN 2687689 Y CN2687689 Y CN 2687689Y CN 200320104684 CN200320104684 CN 200320104684 CN 200320104684 U CN200320104684 U CN 200320104684U CN 2687689 Y CN2687689 Y CN 2687689Y
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- microprocessor
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- signal generation
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Abstract
The utility model discloses a portable signal generation calibrating apparatus, which is chiefly composed of a microprocessor, an input signal process circuit, an output signal process circuit, a monitoring circuit, an eeprom memory circuit, a display circuit, a status switch detection circuit, etc. The portable signal generation calibrating apparatus takes the microprocessor as the core; the status of the signal can be detected through relevant keys, and the signal detection or the signal output which can satisfy the requirements of the users can be displayed. The calibrating apparatus which has higher accuracy and stability, and convenient operation and usage can not only simulate the standard signal emitted by all kinds of industrial process apparatuses, but also can measure the standard signal generated by industrial process control apparatuses; the portable signal generation calibrating apparatus can not only be used for the alignment and check of the automation apparatus and the automatic control system, but also can be used for the detection, calibration, and maintenance of the site equipment.
Description
Technical field
The utility model belongs to industrial instrumentation instrument detection technique field, is specifically related to a kind of portable signal generation tester.
Background technology
There are the following problems and shortcoming for the portable signal generation tester of domestic manufacturer's production now:
1, adopts the potentiometer circuit structure
When the portable signal generation tester of domestic production at present, its internal circuit adopt the potentiometer circuit design, carry out self adjustment by the adjustment of potentiometer parameter, just be easy to generate drift in case be subjected to vibration in given eigenwert.
2, the inconvenience of output signal
The input of the signal source of domestic production at present can only be adopted simple increase and reduce mode of operation.For example: want output is become 12.5mA by 4mA, can only slowly become 12.5mA to output from 4mA constantly by increasing key, the utmost point is unfavorable for by the adjustment of school instrument.
Summary of the invention
The purpose of this utility model is the above-mentioned shortcoming that exists at prior art, a kind of portable signal generation tester is provided, adopt intelligent chip technology and 16 A/D converter designs, make precision and degree of stability be enough to satisfy 0.1% requirement, in signal output, both can adopt the trace increase and decrease mode of operation that increases and reduce, be provided with the step mode of operation again, make output convenient and swift.
For realizing the object of the invention, technical solution of the present utility model is as follows:
Portable signal generation tester, mainly by microprocessor, the input signal treatment circuit, output signal processing circuit, the eeprom memory circuit, compositions such as display circuit and status switch testing circuit, with the microprocessor is core, design input signal treatment circuit connects the I/O interface of microprocessor, the control end of microprocessor connects output signal processing circuit, the status switch testing circuit is connected with the I/O interface of microprocessor, the I/O interface of microprocessor connects eeprom memory circuit and display circuit, instrument is by relevant bonded state input, satisfy input or signal output and demonstration that the user requires, and the data storage method of employing eigenwert, get for potentiometer adjustment mode, make the stable more and extremely strong anti-vibration ability of this tester input/output signal.
This portable signal generation tester does not adopt the potentiometer structure in design, avoided the drifting problem that adopts potentiometer to bring, adopted intelligent chip technology and 16 A/D converter designs, made precision and degree of stability be enough to satisfy 0.1% requirement, it is convenient especially to manipulate.Simultaneously, in signal output, both can adopt the mode of operation that increases and reduce that output signal is carried out trace increase and decrease control, the step mode of operation that is provided with 4mA, 8mA, 12mA, 16mA and 20mA or 1V, 2V, 3V, 4V and 5V is again carried out large span control to output signal, makes output convenient and swift.This tester both can have been simulated the standard signal that various industrial process instrument are sent, and also can measure the standard signal that the industrial process control instrument is produced, and was the good assistant of the debugging and the verification of instrument and meter for automation, automatic control system.Can be used for the instrument debugging and the verification of instrument manufacturer, and the detection of field apparatus, adjustment and maintenance.
Description of drawings
Fig. 1 is the circuit block diagram of this tester;
Fig. 2 is the circuit theory diagrams of this tester.
Specific embodiments:
Referring to Fig. 1, this portable signal generation tester mainly is made up of microprocessor, input signal treatment circuit, output signal processing circuit, supervisory circuit, eeprom memory circuit, display circuit and status switch testing circuit etc.With the microprocessor is core, the input signal treatment circuit connects the I/O interface of microprocessor, the control end of microprocessor connects output signal processing circuit, the status switch testing circuit is connected with the I/O interface of microprocessor, the I/O interface of microprocessor connects eeprom memory circuit and display circuit, also connect supervisory circuit, during line under-voltage automatically locking with under-voltage sign of output signal shown.
Referring to Fig. 2, main circuit is partly set forth:
1) microprocessor
Microprocessor adopts the 89C51 single-chip microcomputer, interrupts outside the employing waking mode of operation up in program design, makes self to be in little power consumption state, by relevant bonded state input, satisfies input or signal output and demonstration that the user requires.
2) input signal treatment circuit
This circuit selects circuit and A/D change-over circuit to form by input signal.Three key interlocks difference corresponding voltage that input signal selects circuit to be provided with by this tester panel, electric current and break-make are carried out input signal and are extracted, microprocessor is carried out corresponding software according to the state of triple bond, extracts input signal data and the corresponding with it signal numerical value of control display circuit demonstration by control A/D change-over circuit.
3) output signal processing circuit
This circuit is made up of D/A change-over circuit and controlled constant-current source circuit.The D/A change-over circuit is under the control of microprocessor, realize the conversion of numeral and simulating signal, control controlled constant current source output, under the condition of supply voltage, satisfy constant current output greater than 12V according to the size of simulating signal output, its pull-up resistor R≤500 Ω, voltage output load R 〉=20K Ω.
4) eeprom circuit
This circuit is made up of power-down data protection circuit and working condition supervisory circuit.The power-down data protection circuit is mainly stored whole parameters of entire equipment, even data still are saved after the power down, the holding time is 10 years.The effect of supervisory circuit is the unconventional fault that prevents that program from flying out and external control equipment causes, the duty of this equipment is monitored, in case device fails was finished in 1 second from recovering.
5) display circuit
This circuit is made up of LCM405 liquid crystal display and control circuit, except 4 bit digital show, also provides 6 state show labels, and under the prompting of 6 Status Flags, the user is very easy to use.
6) status switch testing circuit
This circuit is formed from locking switch and 5 operating keys and treatment circuit by 3,3 from locking the detection signal mode that switch provides the user to select this equipment, electric current, voltage and logical short three kinds of detections are arranged, 5 operating keys are used for the operation to output signal, wherein " I/O " key is used for control and is shown as input signal or output signal, and provide the corresponding prompt show label, all the other 4 keys are used to control the trace increase and decrease of output signal and the increase and decrease control of jumping, and are specially adapted to the adjustment of industrial instrumentation instrument.
Principle of work: this product is core with the microprocessor technology, finishes the control of various circuit according to key operated switch and treatment circuit, not only can be to the detection of voltage, electric current and the break-make of input signal, and can also control the control of voltage or current output signal.
When detecting voltage input signal: 3 are pressed from the switch that locks indicating in the switch " voltage ",
The test pencil that connects input is touched in the measured point.Concrete body is referring to Fig. 2.
When detecting current input signal: 3 are pressed from the switch that locks indicating in the switch " electric current ",
The test pencil that connects input is touched in the measured point.Concrete body is referring to Fig. 2.
Detect break-make: 3 are pressed from the switch that locks indicating in the switch " break-make ",
The test pencil that connects input is touched in the measured point.
When resistance≤500 Ω, liquid crystal display " 0.000 ", expression is communicated with.
When resistance＞500 Ω, liquid crystal display "----", expression disconnects.Specifically
Referring to Fig. 2.
Claims (5)
1, portable signal generation tester, it is characterized in that: be core with the microprocessor, the input signal treatment circuit connects the I/O interface of microprocessor, the control end of microprocessor connects output signal processing circuit, the status switch testing circuit is connected with the I/O interface of microprocessor, and the I/O interface of microprocessor connects eeprom memory circuit and display circuit.
2, portable signal generation tester according to claim 1 is characterized in that: the input signal treatment circuit selects circuit and A/D change-over circuit to form by input signal, and output signal processing circuit is made up of D/A change-over circuit and controlled constant-current source circuit.
3, portable signal generation tester according to claim 1 is characterized in that: the status switch testing circuit is formed from locking switch and 5 operating keys and treatment circuit by 3.
4, portable signal generation tester according to claim 1, it is characterized in that: the I/O interface of microprocessor also connects supervisory circuit, during line under-voltage automatically locking with under-voltage sign of output signal is shown.
5, portable signal generation tester according to claim 1 is characterized in that: the eeprom memory circuit adopts the data storage method of eigenwert, gets for potentiometer adjustment mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320104684 CN2687689Y (en) | 2003-12-26 | 2003-12-26 | Portable signal generation calibrating instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320104684 CN2687689Y (en) | 2003-12-26 | 2003-12-26 | Portable signal generation calibrating instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2687689Y true CN2687689Y (en) | 2005-03-23 |
Family
ID=34661561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320104684 Expired - Fee Related CN2687689Y (en) | 2003-12-26 | 2003-12-26 | Portable signal generation calibrating instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2687689Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101526423B (en) * | 2008-12-23 | 2011-12-07 | 上海发电设备成套设计研究院 | Intelligent check gauge of steam turbine monitor protection instrument and check method |
| CN102565740A (en) * | 2011-12-29 | 2012-07-11 | 广东中钰科技有限公司 | Portable intelligent signal generation calibration device |
| CN106771420A (en) * | 2016-11-25 | 2017-05-31 | 国网河南省电力公司平顶山供电公司 | Portable zero-pressure lifting device |
-
2003
- 2003-12-26 CN CN 200320104684 patent/CN2687689Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101526423B (en) * | 2008-12-23 | 2011-12-07 | 上海发电设备成套设计研究院 | Intelligent check gauge of steam turbine monitor protection instrument and check method |
| CN102565740A (en) * | 2011-12-29 | 2012-07-11 | 广东中钰科技有限公司 | Portable intelligent signal generation calibration device |
| CN106771420A (en) * | 2016-11-25 | 2017-05-31 | 国网河南省电力公司平顶山供电公司 | Portable zero-pressure lifting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |