CN201281609Y - Process check meter - Google Patents
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- CN201281609Y CN201281609Y CNU200820166591XU CN200820166591U CN201281609Y CN 201281609 Y CN201281609 Y CN 201281609Y CN U200820166591X U CNU200820166591X U CN U200820166591XU CN 200820166591 U CN200820166591 U CN 200820166591U CN 201281609 Y CN201281609 Y CN 201281609Y
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- 238000005516 engineering process Methods 0.000 abstract description 11
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- 230000009286 beneficial effect Effects 0.000 abstract 1
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- 230000015556 catabolic process Effects 0.000 description 5
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- 230000001915 proofreading effect Effects 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a process check gauge, consisting of an input channel, an output channel, a reference voltage, a constant flow source, a control unit, a keyboard, a display unit, a communication unit and a storage unit. The input channel and the output channel of the process check gauge are designed into different precisions; the input channel is designed according to the high-precision index and is calibrated with a superhigh-precision authentification and correction device, so as to establish a calibrated reference meter; the output channel is designed according to the degrading-precision index, thus being beneficial to lowering the cost of the process check gauge and improving the rate of finished products; while the precision of the output channel is improved by depending on the high-precision input channel and the calibrated reference meter and adopting the real-time feedback correction technology, so that the process check gauge has high cost performance and high precision. The self-correction technology integrated with reference can effectively overcome the measuring changefulness of the process check gauge caused by the factors such as time drift, temperature drift and the like, thus ensuring that the process check gauge has long-period high precision and high stability.
Description
Technical field
The utility model relates to instrument field, relates in particular to a kind of process checking gauge.
Background technology
Along with maximization, the intensification of production run device, supporting high accuracy number instrument comes into operation in a large number.Safe, reliable, economic, the efficient operation of production run must rely on the digital measure and control instrument that is installed on the commercial plant flow process pipeline, as: sensor, transmitter, regulator, actuator wait monitors and regulates the production process parameter.According to the relevant rules of national measurement Law,, must regularly it be examined and determine and safeguard for guaranteeing the accuracy and the traceability of measurement data with every profession and trade.The calibrating of measure and control instrument and safeguard and to be configured to down equipment: equipment such as precision resistance case, potential difference meter, digital multimeter, cold junction temperature meter, and thermopair, thermal resistance calibration table for reference etc.Traditional instrument calibration and safeguard that flow process is the dismounting field instrument send the measuring room verification, and qualified back instrument is reinstalled the scene, and the long flow path link is many, consuming time, effort, inefficiency; Simultaneously there is big gap in production on-site environment with the measuring room environment usually, causes the deviation between instrument calibration precision that measuring room provides and the scene installation instrument realistic accuracy; Therefore, traditional instrument calibration and the maintaining method requirement that can't satisfy modern production.Existing equipment is examined and determine maintenance in the production scene to measure and control instrument, then because of too much equipment carries inconvenience, and complex operation, inefficiency is easily made mistakes when cold junction compensation is handled, and calibrating and the precision of safeguarding are difficult to guarantee.Developed country generally adopts process checking gauge at present, directly measure and control instrument is calibrated at the production run scene, and work efficiency and quality are significantly improved.The basic function of process checking gauge is standard pyroelectric signals such as measurement and output voltage, electric current, resistance, frequency, temperature, is the indispensable calibration equipment that instrument calibration and maintenance are carried out in the developed country production scene.
Fluke 700 series of U.S. FLUKE company have nearly 20 different model products, have contained various individual event functions, and are multi-functional, and process authentication correcting device, and it is optional to have multiple accuracy class.The Fluke725 process checking gauge is economical product, with voltage, electric current, resistance, temperature (9 kinds of thermopairs, multiple functions such as measurement 4 kinds of thermal resistances) and output are integrated, precision 0.02%FS (www.fluke.com) is the process checking gauge that domestic recoverable amount is maximum, use is comparatively general.The typical products and the manufacturer of domestic process checking gauge have: the ID-02 comprehensive calibrator of Xian Instrument Factory and IDT-22 instrument check instrument have the measurement and the output function of voltage, electric current, resistance, precision 0.1-0.2%FS; The XF30 series multifunctional prover of Shanghai Electric Meter Factory, the precision of 0.02%FS; YJ139A type dc voltage and current tester is the precision of 0.05%FS.Domestic process checking gauge supplier also has the triumph in Shenzhen, and the golden instrument in Yuyao, Zhejiang is mainly produced the low side process checking gauge, and accuracy class is based on 0.05%FS, and function is complete inadequately.Homemade process checking gauge producer follows reverse engineering technology path figure mostly, from dissecting, analyze external process checking gauge incision, and the road of following imitated external low-end product, the technology of rarely seen autonomous innovation only can provide the basic function of external product.Because domestic electronic devices and components and Instrument Manufacturing Technique lag behind the level of going together abroad, homemade process checking gauge exists than big gap with external on Key Performance Indicators such as precision and long-time stability, and price advantage is not obvious, and market share is limited.
Summary of the invention
The utility model provides a kind of process checking gauge at the deficiency that the existing process tester exists.
Process checking gauge comprises microprocessor, LCD display, storer, communication interface, keyboard, module is selected in measurement/output, parameter type is selected module, voltage reference module, the constant current source module, input channel ADC module, output channel DAC module, output channel is to the input channel feedback module, microprocessor respectively with LCD display, storer, communication interface, keyboard, input channel ADC module, output channel DAC module is connected, output channel DAC module is selected module with parameter type respectively, the constant current source module, output channel to input channel feedback module is connected, input channel ADC module is selected module with parameter type respectively, voltage reference module, the constant current source module, output channel is connected to the input channel feedback module, and parameter type selects module and output/measurement to select module to be connected.
The pass that connects of output channel DAC module is: the pin 24 of microprocessor LPC2101,28,22,23,13,14,18,21 respectively with the pin 1 of DA conversion chip AD5362,3,47,48,49,51,55,56 are connected, the pin 12 of DA conversion chip AD5362 be connected with the pin 14 of analog switch CD4066 and an end of first resistance R 1 respectively after pin 33 is connected, and meet voltage Vc, the pin 5 of DA conversion chip AD5362,37 respectively with the pin 2 of analog switch CD4066,4 are connected, the pin 54 of DA conversion chip AD5362 is connected back ground connection with the pin 7 of analog switch CD4066, after being connected, one end of the other end of first resistance R 1 and the 4th resistance R 4 is connected with an end of the 3rd resistance R 3 and the inverting input of the second amplifier A2 respectively, after being connected, the output terminal of the other end of the 3rd resistance R 3 and the first amplifier A1 is connected with the pin 1 of analog switch CD4066 and the inverting input of the first amplifier A1 respectively, the normal phase input end of the first amplifier A1 is connected with the pin 3 of analog switch CD4066, the positive input end grounding of the second amplifier A1, after being connected, the output terminal of the other end of the 4th resistance R 4 and the second amplifier A1 is connected with an end of second resistance R 2 and an end of first capacitor C 1 respectively, the other end ground connection of first capacitor C 1, the other end of second resistance R 2 is connected with an end of second capacitor C 2, the other end ground connection of second capacitor C 2.
The annexation of the input channel ADC module of process checking gauge is: the pin 1 of analog switch CD4066,4,9,10 respectively with the pin 3 of AD conversion chip AD7799,4,8,7 are connected, the pin 5 of analog switch CD4066 is connected the back and is connected with the pin 45 of microprocessor LPC2101 with the pin 13 of analog switch CD4066, the pin 6 of analog switch CD4066 is connected the back and is connected with the pin 46 of microprocessor LPC2101 with the pin 12 of analog switch CD4066, the pin 7 of analog switch CD4066 is connected with voltage V-, the pin 14 of analog switch CD4066 is connected with voltage V+, the pin 1 of AD conversion chip AD7799,2,9,10 respectively with the pin 37 of microprocessor LPC2101,36,29,30 are connected, after being connected, one end of the pin 8 of analog switch CD4066 and the 5th resistance R 5 is connected with an end of the 6th resistance R 6 and the inverting input of the 3rd amplifier A3 respectively, the other end of the 5th resistance R 5 is connected with the pin 11 of analog switch CD4066 and the output terminal of the 3rd amplifier A3 respectively, ground connection after the other end of the 6th resistance R 6 is connected with an end of diode DWI anode and the 3rd capacitor C 3 respectively, after being connected, one end of diode DW1 negative terminal and the 7th resistance R 7 is connected with the normal phase input end of the 3rd amplifier A3 and the pin 16 of AD conversion chip AD7799 respectively, the other end of the 7th resistance R 7 respectively with the other end of the 3rd capacitor C 3, the pin 11 of AD conversion chip AD7799, the pin 12 of AD conversion chip AD7799 is connected with voltage Vc, and the pin 15 of the pin 13 of AD conversion chip AD7799 and AD conversion chip AD7799 is connected back ground connection.
The utility model is by the transmission of transport property polynomial expression benchmark, and each range accuracy of process checking gauge all obtains proofreading and correct, and makes process checking gauge have long-term high precision and high stability.The deviation of signal that the process checking gauge output channel produces carries out the real-time closed-loop feedback compensation by high precision input channel and demarcation master meter, and the precision of process checking gauge output channel is promoted.
Description of drawings
Fig. 1 is the process checking gauge panel layout;
Fig. 2 is the process checking gauge block scheme;
Fig. 3 is the schematic diagram of the function of process checking gauge;
Fig. 4 is a process checking gauge output channel circuit diagram;
Fig. 5 is a process checking gauge input channel circuit diagram;
Fig. 6 is that benchmark merges the self-correcting technology schematic diagram;
Fig. 7 is the process checking gauge FB(flow block).
Embodiment
Describe technology path of the present utility model in detail below in conjunction with accompanying drawing.
The process checking gauge outward appearance as shown in Figure 1, the function declaration of each keysym of panel sees Table 1.
The explanation of table 1 process checking gauge panel code
The process checking gauge of built-in vast capacity lithium battery is the handheld portable instrument of a kind of measurement and heat outputting electric signal, and the function of process checking gauge is consulted table 2.
Table 2 process checking gauge function list
As Fig. 2, shown in 3, the process checking gauge process checking gauge comprises microprocessor, LCD display, storer, communication interface, keyboard, module is selected in measurement/output, parameter type is selected module, voltage reference module, the constant current source module, input channel ADC module, output channel DAC module, output channel is to the input channel feedback module, microprocessor respectively with LCD display, storer, communication interface, keyboard, input channel ADC module, output channel DAC module is connected, output channel DAC module is selected module with parameter type respectively, the constant current source module, output channel to input channel feedback module is connected, input channel ADC module is selected module with parameter type respectively, voltage reference module, the constant current source module, output channel is connected to the input channel feedback module, and parameter type selects module and output/measurement to select module to be connected.
Measure (input) passage by high precision index Design process checking gauge, comprise 24 ADC, high-grade electronic devices and components etc., guarantee the high precision and the high stability of process checking gauge measurement passage; The process checking gauge output channel then by the design of degradation precision index, comprises the electronic devices and components of 16 DAC, degradation etc., helps to reduce device and tester cost, improves the yield rate of process checking gauge.Therefore, process checking gauge input, output channel have different design accuracy grades.Process checking gauge is measured the superhigh precision standard signal that passage input process authentication calibration equipment provides, and sets up in view of the above and demarcates master meter.The deviation of signal that the process checking gauge output channel produces carries out the real-time closed-loop feedback compensation by high precision input channel and demarcation master meter, and the precision of process checking gauge output channel is promoted., be example now, discuss the system design know-why of asymmetric precision with output 1V voltage in conjunction with process checking gauge schematic diagram based on asymmetric accuracy systems designing technique.The normal voltage signal of process authentication calibration equipment output 1V superhigh precision, process checking gauge input 1V standard signal is set up in view of the above and is demarcated master meter, the corresponding digital quantity 65535 of this routine 1V.
The self-correcting process of output 1V voltage is (microprocessor is controlled in real time, and substep is carried out) as shown in Figure 2:
1) CPU is according to demarcating master meter, and the digital quantity signal 65535 of sending standard 1V is to the DAC input end;
2) DAC digital-to-analog conversion, signal are after amplifying, and actual output analog quantity voltage 1.005V is to output port;
3) corresponding contacts closure in the analog switch module, output 1.005V inserts and measures passage ADC input end;
4) CPU control ADC analog to digital conversion, obtaining real output signal voltage digital amount is 65863;
5) CPU finishes deviation calculation 65535-65863=-328, provides offset correction amount-328 and send DAC;
6) the DAC input end obtains new digital quantity 65535-328=65207; Conversion back output simulating signal 0.99997V;
7) CPU control ADC measures once more, and it is 65533 that the 0.99997V analog to digital conversion gets digital quantity;
8) CPU finishes deviation calculation 65535-65533=2, provides offset correction amount 2 and send DAC again;
9) the DAC input end obtains new digital quantity 65207+2=65209; Conversion back output simulating signal 1.00001V.
Proofread and correct through twice feedback signal, output voltage has reached in 0.015% error, is judged by correction program and finishes automatic trimming process.By the process checking gauge output 1V voltage of degradation precision index design not the realistic accuracy of timing be 0.05%, output channel precision improvement to 0.0126% behind the real-time closed-loop feedback compensation.Must be pointed out that this example output 1.00001V is an idea output; In authentication calibration equipment precision is 0.002%, process checking gauge input channel precision is under 0.01% condition, and the realistic accuracy of being not difficult to draw closed-loop corrected back output channel is 0.0126% (0.01%+ (1-0.01%) * 0.002%+[(1-0.01%)-(1-0.01%) * 0.002%] * 0.5 ÷ 65535=0.0126%).The effective prerequisite of above-mentioned correction is the precision of ADC measuring accuracy much larger than the DAC output channel, i.e. the system design technology ultimate principle of asymmetric precision; Next is that ADC measures passage in advance through the demarcation of authentication calibration equipment (standard scale that has 0.002% grade of errors as the HP3458A that adopts Hewlett-Packard).The system design technology of asymmetric precision is on the basis of guaranteeing process checking gauge high precision and high reliability, because output channel by the design of degradation precision index, has improved the yield rate of process checking gauge; Reduced simultaneously the cost (the 85 yuan/sheet that the precision resistance price of Vishay company is 1ppm/ ℃, 3ppm/ ℃ is 35 yuan/sheet, the 5ppm/ of degradation ℃ is 10 yuan/sheet) of tester significantly.
Now, the operating process of output 1V voltage is described in conjunction with Fig. 1 panel figure.The operator by keyboard (MEAS/SOURCE) and (V/Hz) key signal is switched to voltage output, machine inner microprocessor control analog switch module corresponding contacts closure, this moment, the reference of DAC was input as Vref, and well-known DAC output VDA is VDA=Vref with the pass of reference input Vref
D/2
n(n=16, D are DAC input code value, from 0～2
n), so this moment is in output voltage V=(the PGA enlargement factor of instrument ' T2 ' end with ' T1 ' end
Vref
D)/65535, the operator changes the magnitude of voltage that needs simulation output by keyboard, after microprocessor obtains input value, the calibrating parameters of this machine of calling storage, calculate corresponding DAC output code value D and control DAC output, output terminal can obtain required magnitude of voltage output, and the real-time closed-loop trimming process is transparent for the user.
As shown in Figure 4, the pass that connects of output channel DAC module is: the pin 24 of microprocessor LPC2101,28,22,23,13,14,18,21 respectively with the pin 1 of DA conversion chip AD5362,3,47,48,49,51,55,56 are connected, the pin 12 of DA conversion chip AD5362 be connected with the pin 14 of analog switch CD4066 and an end of first resistance R 1 respectively after pin 33 is connected, and meet voltage Vc, the pin 5 of DA conversion chip AD5362,37 respectively with the pin 2 of analog switch CD4066,4 are connected, the pin 54 of DA conversion chip AD5362 is connected back ground connection with the pin 7 of analog switch CD4066, after being connected, one end of the other end of first resistance R 1 and the 4th resistance R 4 is connected with an end of the 3rd resistance R 3 and the inverting input of the second amplifier A2 respectively, after being connected, the output terminal of the other end of the 3rd resistance R 3 and the first amplifier A1 is connected with the pin 1 of analog switch CD4066 and the inverting input of the first amplifier A1 respectively, the normal phase input end of the first amplifier A1 is connected with the pin 3 of analog switch CD4066, the positive input end grounding of the second amplifier A1, after being connected, the output terminal of the other end of the 4th resistance R 4 and the second amplifier A1 is connected with an end of second resistance R 2 and an end of first capacitor C 1 respectively, the other end ground connection of first capacitor C 1, the other end of second resistance R 2 is connected with an end of second capacitor C 2, the other end ground connection of second capacitor C 2.
As shown in Figure 5, the annexation of input channel ADC module is: the pin 1 of analog switch CD4066,4,9,10 respectively with the pin 3 of AD conversion chip AD7799,4,8,7 are connected, the pin 5 of analog switch CD4066 is connected the back and is connected with the pin 45 of microprocessor LPC2101 with the pin 13 of analog switch CD4066, the pin 6 of analog switch CD4066 is connected the back and is connected with the pin 46 of microprocessor LPC2101 with the pin 12 of analog switch CD4066, the pin 7 of analog switch CD4066 is connected with voltage V-, the pin 14 of analog switch CD4066 is connected with voltage V+, the pin 1 of AD conversion chip AD7799,2,9,10 respectively with the pin 37 of microprocessor LPC2101,36,29,30 are connected, after being connected, one end of the pin 8 of analog switch CD4066 and the 5th resistance R 5 is connected with an end of the 6th resistance R 6 and the inverting input of the 3rd amplifier A3 respectively, the other end of the 5th resistance R 5 is connected with the pin 11 of analog switch CD4066 and the output terminal of the 3rd amplifier A3 respectively, ground connection after the other end of the 6th resistance R 6 is connected with an end of diode DW1 anode and the 3rd capacitor C 3 respectively, after being connected, one end of diode DW1 negative terminal and the 7th resistance R 7 is connected with the normal phase input end of the 3rd amplifier A3 and the pin 16 of AD conversion chip AD7799 respectively, the other end of the 7th resistance R 7 respectively with the other end of the 3rd capacitor C 3, the pin 11 of AD conversion chip AD7799, the pin 12 of AD conversion chip AD7799 is connected with voltage Vc, and the pin 15 of the pin 13 of AD conversion chip AD7799 and AD conversion chip AD7799 is connected back ground connection.
As shown in Figure 6, the built-in high-precision voltage reference of process checking gauge utilizes the dividing potential drop of precision resistance to obtain a plurality of reference voltages, makes up the transport property polynomial expression thus.Based on the transport property polynomial expression, the temperature difference or time difference threshold values criterion according to appointment, process checking gauge is measured the metering circuits such as operational amplifier, analog to digital converter of passage and proofreaied and correct, eliminate process checking gauge and measure the uncertainty that passage causes because of time drift, temperature drift etc.By the transmission of benchmark, make each range of tester all obtain proofreading and correct, guarantee high precision and high reliability that process checking gauge is long-term.Now merge the self-correcting technology schematic diagram, discuss the self-correcting technology principle that benchmark merges in conjunction with benchmark.The temperature and time that writes down when merging self-correcting according to benchmark, the temperature difference that writes down when environment temperature and self-correcting be greater than temperature difference threshold values, or the mistiming during with self-correcting greater than time difference during threshold values, start benchmark fusion self-correcting.Voltage reference send amplifier A to amplify through a plurality of reference voltage V i that dividing potential drop obtains after the switching by analog switch, get conversion value Di through the A/D analog to digital conversion and pass to CPU.If each reference voltage Ui (i=0,1 ..., n), corresponding analog to digital conversion value is Di, voltage Vx to be measured, corresponding analog to digital conversion value Dx, do the polynomial of degree n match:
V
0＝a
0+a
1D
0+a
2D
0 2+...+a
nD
0 n
V
1＝a
0+a
1D
1+a
2D
1 2+...+a
nD
1 n (1)
......
V
n＝a
0+a
1D
n+a
2D
n 2+...+a
nD
n n
Can get the column vector that coefficient ai constitutes by match:
A＝(D
R TD
R)
-1D
R TU
R (2)
U wherein
RBe the column vector that Ui constitutes, D
R0 matrix for Di to high order power composition.Therefore, can try to achieve voltage Vx to be measured by following polynomial expression:
V
X＝a
0+a
1D
X+a
2D
X 2+...+a
nD
X n (3)
As shown in Figure 7, the process checking gauge power-up initializing reads in environment temperature and time.The temperature difference that writes down when environment temperature and self-correcting is greater than temperature difference threshold values, or the mistiming during with self-correcting greater than time difference during threshold values, start benchmark and merge self-correcting, upgrade benchmark and merge self-tuning time and thermograph, otherwise disregard.Judged whether that key presses, as no key operation, processor enters dormant state, otherwise carries out bonding analysis.According to button,, then enter corresponding module as belonging to measurement function; As belong to output function, then enter and need carry out close-loop feedback behind the corresponding module and proofread and correct.
Claims (3)
1. process checking gauge, it is characterized in that process checking gauge comprises microprocessor, LCD display, storer, communication interface, keyboard, module is selected in measurement/output, parameter type is selected module, voltage reference module, the constant current source module, input channel ADC module, output channel DAC module, output channel is to the input channel feedback module, microprocessor respectively with LCD display, storer, communication interface, keyboard, input channel ADC module, output channel DAC module is connected, output channel DAC module is selected module with parameter type respectively, the constant current source module, output channel to input channel feedback module is connected, input channel ADC module is selected module with parameter type respectively, voltage reference module, the constant current source module, output channel is connected to the input channel feedback module, and parameter type selects module and measurement/output to select module to be connected.
2. a kind of process checking gauge according to claim 1, the pass that connects that it is characterized in that described output channel DAC module is: the pin 24 of microprocessor LPC2101,28,22,23,13,14,18,21 respectively with the pin 1 of DA conversion chip AD5362,3,47,48,49,51,55,56 are connected, the pin 12 of DA conversion chip AD5362 be connected with the pin 14 of analog switch CD4066 and an end of first resistance R 1 respectively after pin 33 is connected, and meet voltage Vc, the pin 5 of DA conversion chip AD5362,37 respectively with the pin 2 of analog switch CD4066,4 are connected, the pin 54 of DA conversion chip AD5362 is connected back ground connection with the pin 7 of analog switch CD4066, after being connected, one end of the other end of first resistance (R1) and the 4th resistance (R4) is connected with an end of the 3rd resistance (R3) and the inverting input of second amplifier (A2) respectively, after being connected, the output terminal of the other end of the 3rd resistance (R3) and first amplifier (A1) is connected with the pin 1 of analog switch CD4066 and the inverting input of first amplifier (A1) respectively, the normal phase input end of first amplifier (A1) is connected with the pin 3 of analog switch CD4066, the positive input end grounding of second amplifier (A1), after being connected, the output terminal of the other end of the 4th resistance (R4) and second amplifier (A1) is connected with an end of second resistance (R2) and an end of first electric capacity (C1) respectively, the other end ground connection of first electric capacity (C1), the other end of second resistance (R2) is connected with an end of second electric capacity (C2), the other end ground connection of second electric capacity (C2).
3. a kind of process checking gauge according to claim 1, the annexation that it is characterized in that described input channel ADC module is: the pin 1 of analog switch CD4066,4,9,10 respectively with the pin 3 of AD conversion chip AD7799,4,8,7 are connected, the pin 5 of analog switch CD4066 is connected the back and is connected with the pin 45 of microprocessor LPC2101 with the pin 13 of analog switch CD4066, the pin 6 of analog switch CD4066 is connected the back and is connected with the pin 46 of microprocessor LPC2101 with the pin 12 of analog switch CD4066, the pin 7 of analog switch CD4066 is connected with voltage V-, the pin 14 of analog switch CD4066 is connected with voltage V+, the pin 1 of AD conversion chip AD7799,2,9,10 respectively with the pin 37 of microprocessor LPC2101,36,29,30 are connected, after being connected, one end of the pin 8 of analog switch CD4066 and the 5th resistance R 5 is connected with an end of the 6th resistance (R6) and the inverting input of the 3rd amplifier (A3) respectively, the other end of the 5th resistance (R5) is connected with the pin 11 of analog switch CD4066 and the output terminal of the 3rd amplifier (A3) respectively, ground connection after the other end of the 6th resistance (R6) is connected with an end of diode DW1 anode and the 3rd electric capacity (C3) respectively, after being connected, one end of diode DW1 negative terminal and the 7th resistance (R7) is connected with the normal phase input end of the 3rd amplifier (A3) and the pin 16 of AD conversion chip AD7799 respectively, the 7th resistance (other end of R7 respectively with the other end of the 3rd electric capacity (C3), the pin 11 of AD conversion chip AD7799, the pin 12 of AD conversion chip AD7799 is connected with voltage Vc, and the pin 15 of the pin 13 of AD conversion chip AD7799 and AD conversion chip AD7799 is connected back ground connection.
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|---|---|---|---|
| CNU200820166591XU CN201281609Y (en) | 2008-10-31 | 2008-10-31 | Process check meter |
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| CNU200820166591XU CN201281609Y (en) | 2008-10-31 | 2008-10-31 | Process check meter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339815B (en) * | 2008-08-14 | 2010-08-18 | 浙江大学 | Process checking gauge and design method thereof |
| CN102768314A (en) * | 2012-07-05 | 2012-11-07 | 四川电力科学研究院 | Double-closed-loop testing device for intelligent substation and control method thereof |
| CN103995226A (en) * | 2013-12-27 | 2014-08-20 | 杭州长川科技有限公司 | Method for improving accuracy of analog integrated circuit test system |
| CN113125940A (en) * | 2021-04-16 | 2021-07-16 | 桥弘数控科技（上海）有限公司 | Circuit board correction method and device and electronic equipment |
-
2008
- 2008-10-31 CN CNU200820166591XU patent/CN201281609Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339815B (en) * | 2008-08-14 | 2010-08-18 | 浙江大学 | Process checking gauge and design method thereof |
| CN102768314A (en) * | 2012-07-05 | 2012-11-07 | 四川电力科学研究院 | Double-closed-loop testing device for intelligent substation and control method thereof |
| CN102768314B (en) * | 2012-07-05 | 2014-09-24 | 四川电力科学研究院 | Double-closed-loop testing device for intelligent substation and control method thereof |
| CN103995226A (en) * | 2013-12-27 | 2014-08-20 | 杭州长川科技有限公司 | Method for improving accuracy of analog integrated circuit test system |
| CN103995226B (en) * | 2013-12-27 | 2017-01-04 | 杭州长川科技股份有限公司 | For the method improving analog integrated circuit test system precision |
| CN113125940A (en) * | 2021-04-16 | 2021-07-16 | 桥弘数控科技（上海）有限公司 | Circuit board correction method and device and electronic equipment |
| CN113125940B (en) * | 2021-04-16 | 2022-08-23 | 桥弘数控科技（上海）有限公司 | Circuit board correction method and device and electronic equipment |
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