CN1297816C - Signal collecting and processing apparatus for ion chromatograph - Google Patents
Signal collecting and processing apparatus for ion chromatograph Download PDFInfo
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- CN1297816C CN1297816C CNB031308589A CN03130858A CN1297816C CN 1297816 C CN1297816 C CN 1297816C CN B031308589 A CNB031308589 A CN B031308589A CN 03130858 A CN03130858 A CN 03130858A CN 1297816 C CN1297816 C CN 1297816C
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Abstract
The present invention relates to a signal sampling and processing device of an ion chromatograph, which comprises a pulse-generating circuit, a conductive cell, a weak signal amplifying circuit, a sample holding circuit, a secondary amplifying circuit, an A/D sampling circuit, a single chip computer processing circuit and an output display circuit, wherein two electrodes of the conductive cell are connected with the output terminal of the pulse-generating circuit; the input terminal of the weak signal amplifying circuit is connected with the conductive cell; the input terminal of the sample holding circuit is connected with the output terminal of the weak signal amplifying circuit; the input terminal of the secondary amplifying circuit is connected with the output terminal of the sample holding circuit; the input terminals of multiple switches of the collecting circuit are connected with the output terminal of the secondary amplifying circuit; the input interface of the single chip computer processing circuit is connected with the output terminal of the A/D collecting circuit, and an output interface of control signals is connected with the multiple switches of the A/D collecting circuit; the input terminal of the output display circuit is connected with the output interface of a single chip computer. The present invention uses pulse signal excitation, synchronous multiple-point sampling and the equivalent circuit of the conductive electrode in solution to compute a pulse responding math equation. Solution conductivity and double-layer capacitance value can be obtained simultaneously, and the measuring range of a conductive detector is enlarged. The present invention is suitable for the sample analysis with larger component concentration phase difference, and can avoid outer interference and instrument damage caused by false operation.
Description
(1) technical field
The present invention relates to a kind of signals collecting and treatment circuit, in particular for the signals collecting and the treating apparatus of ion chromatograph.
(2) background technology
Chromatography of ions is a novel liquid chromatography that grows up after the seventies in 20th century.This technical development is rapid, has become the strong instrument of separation, the different yin, yang ions of detection.Existing ion chromatograph signals collecting and treating apparatus, for example IC-6 type ion chromatograph (Qingdao Laoshan Electronic Instrument General Factory) and YIC-8 type ion chromatograph (the easily logical instrument research institute of Qingdao high-tech park) adopt two electrode structures basically, at sampling resistor of front end conductance cell series connection, amplifier is from the sampling resistor number of winning the confidence, and the advantage that this method does not effectively utilize the input of amplifier difference suppresses common-mode noise.Because the conductance cell signal is very faint, and concentration of component differs than very big, and existing acquisition system is for range extension, gear shift by hand basically, and the complicacy that this has increased operation has reduced the class of instrument.Therefore, exploitation high precision, high stability, multi-functional ion chromatograph conductance detection system are imperative.
(3) summary of the invention
The present invention aims to provide a kind of precision height, good stability, function ion chromatograph signals collecting and treating apparatus how.
The present invention is provided with:
Driving pulse produces circuit, is used to produce the anti-phase each other excitation pulse signal of two-way;
Conductance cell, its two electrode connect the output terminal that driving pulse produces circuit, are used to produce the solution conductivity signal;
The weak signal amplifying circuit, the solution conductivity signal output part at its input termination conductance cell two ends;
Sampling hold circuit, the output terminal of its input termination weak signal amplifying circuit is used for the solution conductivity signal is carried out peak detection;
The secondary amplifying circuit, the output terminal of its input termination sampling hold circuit is used to amplify the solution conductivity signal;
The A/D Acquisition Circuit, the output terminal of its multi pass acquisition on-off circuit input termination secondary amplifying circuit is used for timesharing ground the analog signal conversion of solution conductivity value is delivered to the single-chip microcomputer treatment circuit with becoming the digital signal parallel series;
The single-chip microcomputer treatment circuit, its input interface connects the output terminal of A/D Acquisition Circuit, its control signal output ends mouth connects the multi pass acquisition on-off circuit of A/D Acquisition Circuit, be used for system control core, finish control and data processing, and the data after will handling are sent to PC by the serial port circuit to system's each several part;
The output display circuit, its input end connects the output interface of single-chip microcomputer treatment circuit.
Between sampling hold circuit output terminal and secondary input amplifier, can establish signal pre-processing circuit, be used to remove the various interfering components of peak value solution conductivity signal.
Between secondary amplifying circuit and A/D Acquisition Circuit, can establish signal switching circuit, between conductance cell and signal switching circuit, establish temperature sensing circuit, the temp probe of temperature sensing circuit is located in the conductance cell, temperature sensing circuit is used to obtain the temperature signal of conductance cell, and signal switching circuit is used for the A/D Acquisition Circuit is sent in the temperature value signal timesharing of solution conductivity signal and conductance cell.
For electric conductivity value size according to different base solution, change the enlargement factor of weak signal amplifying circuit, can in the weak signal amplifying circuit, establish gain control circuit.For start time and the duration of controlling peak detection, in sampling hold circuit, establish sampling and keep pulse control circuit.Between secondary amplifying circuit and single-chip microcomputer treatment circuit, can establish D/A button substrate circuit, be used to send the electric conductivity value that solion to be measured does not detect preceding substrate solution.Between the analog detection disposal system of compositions such as weak signal amplifying circuit, sampling hold circuit, secondary amplifying circuit, signal switching circuit and digital collection disposal system and single-chip microcomputer treatment circuit, can establish optical coupling isolation circuit, realize the conversion of light signal and electric signal.
Can establish the hardware check reference signal generating circuit, be used for by scm software control the above-mentioned main hardware of the instrument back performance checking of starting shooting, the output termination weak signal amplifying circuit of hardware check reference signal generating circuit.
The present invention adopts pulse signal excitation and synchronous multi-point sampling, utilizes the equivalent electrical circuit of conductance electrode in solution, finds the solution the math equation of its paired pulses response, can obtain solution conductivity and double-layer capacitance value simultaneously, enlarges the measurement range of electric conductivity detector.Can design auto-gain circuit and 16 s' serial a/d data acquisition circuit, to adapt to concentration of component than the sample analysis that differs greatly.Designed perfect holding circuit simultaneously, prevented external interference and maloperation damage instrument.
If adopt the high-performance instrumentation amplifier of difference input, directly get the differential signal at conductance cell two ends, then can suppress common mode interference effectively, successfully extract faint useful signal; Analog detection collecting part and digital signal processing part can be used light-coupled isolation fully, effectively reduce noise, software filtering and software anti-jamming in the single-chip microcomputer digital signal processing, have been used, sampling holder spare is selected in obtaining of useful signal for use, it is adopted protect width and the sampling location can according to circumstances change.Table 1 provides the contrast of the present invention and some major product technical indicator.
(4) description of drawings
Fig. 1 is the circuit composition frame chart of the embodiment of the invention 1.
Fig. 2 is the circuit composition frame chart of the embodiment of the invention 2.
Fig. 3 is that the driving pulse of the embodiment of the invention produces circuit theory diagrams.
Fig. 4 is the weak signal amplifying circuit and the sampling hold circuit schematic diagram of the embodiment of the invention.
Fig. 5 is an embodiment of the invention signal pre-processing circuit schematic diagram.
Fig. 6 is an embodiment of the invention secondary amplifying circuit schematic diagram.
Fig. 7 is embodiment of the invention D/A button substrate circuit, signal switching circuit, temperature sensing circuit schematic diagram.
Fig. 8 is an embodiment of the invention A/D Acquisition Circuit schematic diagram.
Fig. 9 is the single-chip microcomputer treatment circuit schematic diagram of the embodiment of the invention.
Figure 10～12 are the optical coupling isolation circuit schematic diagram of the embodiment of the invention.
Figure 13 is the single-chip microcomputer master routine in the Single Chip Microcomputer (SCM) program process flow diagram.
Figure 14 is the startup subroutine in the Single Chip Microcomputer (SCM) program process flow diagram.
Figure 15 is the sample introduction subroutine in the Single Chip Microcomputer (SCM) program process flow diagram.
Figure 16 is the self check subroutine in the Single Chip Microcomputer (SCM) program process flow diagram.
Figure 17 is the A/D interruption subroutine in the Single Chip Microcomputer (SCM) program process flow diagram.
Figure 18 is the gain-adjusted subroutine in the Single Chip Microcomputer (SCM) program process flow diagram.
Figure 19 is the transmission subroutine in the Single Chip Microcomputer (SCM) program process flow diagram.
Figure 20 is the reception subroutine in the Single Chip Microcomputer (SCM) program process flow diagram.
(5) embodiment
As shown in Figure 1, the present invention is provided with driving pulse and produces circuit 1, is used to produce the anti-phase each other excitation pulse signal of two-way; Conductance cell 2, its two electrode connect the output terminal that driving pulse produces circuit, are used to produce the solution conductivity signal; Weak signal amplifying circuit 3, the solution conductivity signal output part at its input termination conductance cell two ends; Sampling hold circuit 4, the output terminal of its input termination weak signal amplifying circuit is used for the solution conductivity signal is carried out peak detection; Secondary amplifying circuit 5, the output terminal of its input termination sampling hold circuit is used to amplify the solution conductivity signal; A/D Acquisition Circuit 6, the output terminal of its multi pass acquisition on-off circuit input termination secondary amplifying circuit is used for timesharing ground the analog signal conversion of solution conductivity value is delivered to the single-chip microcomputer treatment circuit with becoming the digital signal parallel series; Single-chip microcomputer treatment circuit 7, its control signal input interface connects the output terminal of A/D Acquisition Circuit, its output port connects the multi pass acquisition on-off circuit of A/D Acquisition Circuit, be used for system control core, finish control and data processing, and the data after will handling are sent to PC by the serial port circuit to system's each several part; Output display circuit 8, its input end connects the output interface of single-chip microcomputer treatment circuit.
As shown in Figure 2, between the input end of the output terminal of sampling hold circuit 4 and secondary amplifying circuit 5, can establish signal pre-processing circuit 11, be used to remove the various interfering components of peak value solution conductivity signal.Between secondary amplifying circuit 5 and A/D Acquisition Circuit 6, can establish signal switching circuit 13, between conductance cell and signal switching circuit 13, establish temperature sensing circuit 14, the temp probe of temperature sensing circuit 14 is located in the conductance cell, temperature sensing circuit is used to obtain the temperature signal of conductance cell, and signal switching circuit is used for the A/D Acquisition Circuit is sent in the temperature value signal timesharing of solution conductivity signal and conductance cell.
For electric conductivity value size according to different base solution, change the enlargement factor of weak signal amplifying circuit 3, can establish gain control circuit 9.
For start time and the duration of controlling peak detection, can establish sampling and keep pulse control circuit 10.
Between secondary amplifying circuit 5 and single-chip microcomputer treatment circuit 7, can establish D/A button substrate circuit 12, be used to send the electric conductivity value that solion to be measured does not detect preceding substrate solution.
Between the analog detection disposal system of compositions such as weak signal amplifying circuit, sampling hold circuit, secondary amplifying circuit, signal switching circuit and digital collection disposal system and single-chip microcomputer treatment circuit 7, can establish optical coupling isolation circuit 15, realize the conversion of light signal and electric signal.
For performance checking after by scm software control the above-mentioned main hardware of instrument being started shooting, can establish hardware check reference signal generating circuit 16, its output termination weak signal amplifying circuit.In addition, output display circuit 8 still connects the single-chip microcomputer treatment circuit.
The course of work of the present invention is summarized as follows:
At first, the start hardware check, self check single-chip microcomputer, parallel port, timer, software watchdog circuit, A/D Acquisition Circuit, D/A detain substrate circuit etc. respectively, and carry out enlargement factor and proofread and correct, after self check is finished, driving pulse exciting conductance pond, the front end signal that is obtained is the more strongly disturbing ultra-weak electronic signal that superposeed, amplify through low noise difference instrumentation amplifier, the output function of amplifier is V
Out=(V
In+-V
In-) * G
1, G
1Be preamplification gain.The common mode interference that conductance cell and system produce can effectively be suppressed.In addition, establish G
2For the gain of back level amplifying circuit, according to the gain allocation principle circuit full gain G of multistage amplifier circuit
Always=G
1* G
2Through sampling hold circuit, the secondary amplifying circuit is after the A/D Acquisition Circuit, send into single-chip microcomputer by light lotus root buffer circuit again, after single-chip microcomputer carries out software filtering and digital processing, send into PC through serial port and show, simultaneously, single-chip microcomputer also receives the control command of PC, according to the substrate value preamplification gain is automatically adjusted, and judge whether baseline is steady, if steadily then send the information that allows sample introduction.Testing sample solution injects (being sample introduction), in sample introduction moment, single-chip microcomputer according to the substrate value control D/A converter of measured eluent with basic voltage value V
SubstrateBe sent to subtracter, then:
V
Substrate=V
Id1* G
1
Single-chip microcomputer is regulated the gain of back level amplifying circuit more automatically then, only the testing sample conductance signal is carried out one-level again and amplifies.Make output signal voltage be:
V
o=(V
Id* G
1-V
Substrate) * G
2=[(V
Id1+ V
Id2) * G
1-V
Id1* G
1] * G
2=V
Id2* G
1* G
2
Not only guaranteed output voltage V
oIn the input voltage allowed band of A/D, and make measured signal voltage V
Id2Fully amplified.
Fig. 3～12 provide the schematic diagram of some main circuits of the embodiment of the invention.
Referring to Fig. 3, integrated circuit U1 (1) (MC1403P type) is a 2.5V reference source in driving pulse generation circuit, by dividing potential drop, switches generation 0.5V square wave through integrated circuit U4 (1) (MAX4519CPD type) switch, delivers to conductance cell two electrodes.Another integrated circuit U2 (1) (MC1403P type) passes through dividing potential drop, produce the 60mv signal, be used as hardware check and demarcate the reference source of enlargement factor, two paths of signals switches output by relay U5 (1) (JRC-19FD type), and the differential input end of weak signal amplifying circuit is delivered in output.
Referring to Fig. 4, in the weak signal amplifying circuit, integrated circuit U1 (3) (AMP01AX/883 type) is low noise, high-precision meter amplifier, and the signal after amplifying is delivered to sampling hold circuit.Two integrated circuit U2 (3), U3 (3) (MAX352CPE type) is used for switching the enlargement factor of U1 (3).Integrated circuit U5 (3) (MC14028BCP type) is a code translator, the input of single-chip microcomputer is deciphered controlled U2 (3), U3 (3).
Solution conductivity signal after sampling hold circuit: integrated circuit U4 (3) (LF398N type) amplifies weak signal carries out delivering to signal pre-processing circuit behind the peak detection.
Referring to Fig. 5, in signal pre-processing circuit, operational amplifier U1 (2), U2 (4) (TLE2144 type) forms Butterworth type low-pass filter, remove the various interference components of peak value solution signal, and its amplitude is carried out 1/3 decay, to adapt to the collection of back A/D signal.
Referring to Fig. 6, in the secondary amplifying circuit, integrated circuit U4 (4) (PGA203KP type) is digital control programmable gain amplifier, SIGNAL1 signal and SIGNAL4 signal are subtracted each other the back amplification, use integrated circuit U1 (4) (MC1403P type) and operational amplifier U2 (4) (TLE2144 type) to carry out polar switching again.Conversion back output SIGNAL6 signal entering signal commutation circuit.
Referring to Fig. 7, in D/A button substrate circuit, the electric conductivity value SIGNAL4 signal of the substrate solution before D/A chip U1 (6) (DAC7611P type) does not detect solion to be measured is sent.
Signal switching circuit: multi-way switch integrated circuit U1 (5) (ADG408BN type) sends SIGNAL1～7 road signal timesharing, through operational amplifier U2 (5) (OP296G type), diode RD1 (5), RD3 (5), the back output of stabilivolt RD2 (5) clamp buffering, pass through relay (RELAY U4 (6) again, U5 (6)) and 0.5V, the A/D Acquisition Circuit is sent in the 60mV timesharing.
Referring to Fig. 8, ∑ in the A/D Acquisition Circuit-Δ type serial a/d chip U3 (5) (AD7715AN-5 type) provides outside reference by integrated circuit U2 (6) (AD780 type), and the input end of photoelectrical coupler is delivered to the analog signal conversion of solution conductivity value and temperature value on timesharing ground with becoming the digital signal parallel series.
Referring to Figure 10～12, in optical coupling isolation circuit, light-coupled isolation device LOPT01～03 (TLP521-4 type) will isolate transmission by the low speed part signal that converts single-chip microcomputer and digital circuit part and artificial circuit part of light signal and electric signal.Light-coupled isolation device HOPT01～12 (TLP559 type) will be isolated by the high speed part signal that converts single-chip microcomputer and digital circuit part and artificial circuit part of light signal and electric signal transmits.
Referring to Fig. 9, in the single-chip microcomputer treatment circuit, single-chip microcomputer U1 (AT89C52 type), control whole flow process, integrated circuit U2 (8255 type) is the expansion parallel port, and integrated circuit U3 (8253 type) is a timer, produce sampling pulse and control sampling maintenance width, integrated circuit U7 (HC7424 type) is the demonstration of seven sections LED encoded control hardware check indication charactrons, and integrated circuit U4 (MAX232 type) is a level transferring chip, communicates by letter with upper PC.
Figure 13～20 provide embodiment of the invention Single Chip Microcomputer (SCM) program process flow diagram.
A. single-chip microcomputer master routine (referring to Figure 13):
After self check was passed through, program was carried out the initialized work of program and peripheral chip, as the initialization of singlechip, the original state of interrupting setting, some preset parameters and exterior I/O being set, the original state of timer etc.
After initialization was finished, program entered normal state.
Constantly inquire about each zone bit in the master routine, the state that changes according to zone bit calls different processing subroutines.
If ● the zone bit set that PC has instruction to transmit, then call to start to receive and instruct subroutine to handle.
If ● the data ready flag set, then call and send the subroutine processing.
If ● the set of sample introduction request mark, then call sample introduction and handle the subroutine processing.
It below is the explanation of each subroutine.
B. startup subroutine (referring to Figure 14):
Startup subroutine calls the reception subroutine, and whether inquiry receives the startup command zone bit then, if this sign is set, then carry out start-up operation, the startup opening flag is set, to PC host computer transmitting system self calibration parameter, start AD then and interrupt, allow sample introduction to interrupt.Like this, single-chip microcomputer will all read in that single-chip microcomputer is handled to the result of each A/D conversion and the result that loses each A/D no longer before starting disregards.
C. sample introduction subroutine (referring to Figure 15):
The sample introduction subroutine is responsible for sending the sample introduction signal to upper PC, and sample introduction sign notice master routine is set simultaneously.Then, return behind the time-delay 50ms.
D. self check subroutine (referring to Figure 16):
After the start, carry out hardware check behind the program power-up initializing earlier, go up the step that shows self check at seven sections light emitting diodes (LED) in the time of self check, as self check to the 3 steps, then LED shows 3, and any step hardware check does not pass through, program is just put to death circulation at this, which the last demonstration of LED is parked in and goes on foot, and is undesired as 8253 self checks, and then the LED demonstration just is parked in 3.
Self check divides 7 steps:
1, singlechip self check;
2, single-chip microcomputer ram in slice self check;
3,8255 parallel expansion self checks;
4,8253 timer self checks;
5, software cryptography code check;
6, A/D self check;
7, D/A self check.
When carrying out 8 these steps, program enters the hardware self calibration stage, carries out 60mv reference source self calibration respectively, the preamplification gain self calibration, and 1/3 attenuator self calibration, 500mv reference source self calibration, after self check was finished, panel indication green light was bright.
E.A/D interruption subroutine (referring to Figure 17):
At first preserve on-the-spot in the A/D interruption subroutine, read the A/D transformation result then, then judge various zone bits, according to various zone bits data are handled, if what gather is that temperature data just is provided with the several signs of sending of temperature, then gather average treatment after 5 point data, corresponding marker bit notice master routine is set then the data of handling are read away; If electric derivative send number sign and current gain according to what just be provided with that electricity leads, follow per 25 electric derivatives according to after average again, corresponding marker bit notice master routine is set then the data of processing is read away.In the A/D interruption subroutine counting unit is set and counts, whenever once interrupt just counting adding one, count down to 29 and just change peripheral multi-way switchs, remove the collecting temperature signal, switch multi-way switch after having adopted again, gather electricity and lead, guaranteed like this to gather a temperature data every 15s.
F. gain-adjusted subroutine (referring to Figure 18):
The gain-adjusted subroutine is at first judged the shelves number of current gain, and the value according to the A/D that reads in judges whether the big gain of needs accent then, if need to regulate, then transfers big one to keep off gain; If do not need, judge whether again and need turn down, if need to regulate, then turn a retaining gain down; If do not need to regulate, then keep present situation to return.
G. send subroutine (referring to Figure 19):
Send subroutine and judge that at first the data that will send are that temperature or electricity are led, if temperature, then send temperature data and Status Flag byte to host computer after 8 temperature data smoothing processing, if electricity is led, judge again that then current state is for before the sample introduction or behind the sample introduction, if before the sample introduction, then send electric derivative according to flag byte to the PC host computer, if behind the sample introduction, then, also to call the gain-adjusted subroutine and regulate weak signal amplifying circuit gain (gain per stage promptly) except send electric derivative certificate and flag byte to host computer.
H. receive subroutine (referring to Figure 20):
Receive subroutine and do corresponding action according to the order that receives PC, start-up operation, manually still automatic gain is regulated, and square wave frequency is set, the sampling location, the constant current source setting is adopted and is protected the width setting.Carrying out corresponding setting if the instruction that receives also will further receive the data of PC, whether be the sign of command byte, further receive data setting if then just removing, be provided with finish after, again whether being the command byte flag set.
Obviously, the present invention has following features:
A. this device adopts the input of both-end difference, directly gets the signal at conductance cell two ends, has effectively reduced common mode disturbances;
B. this device photoelectric coupling circuit has been realized the fully isolation of digital signal processing circuit and analog detection Acquisition Circuit, Effectively reduced the interference of data signal to the simulation weak signal;
C. select ∑-Δ type serial a/d, the noise of not only introducing in the simulation part is little, and the inner 13.1Hz number that carries The word low pass filter has been realized the filtering to signal;
D. in single-chip microcomputer, carry out again software filtering, go the digital processings such as singular value;
E. carry out hardware check before the start, charactron monitoring self check step is arranged, can locate fast trouble location;
F. software control sampling holding position and sampling keep width, and it can conveniently be changed;
G. use a reference source to proofread and correct the multiple of small signals amplification, make multiplication factor more accurate;
H. the multiplication factor automatic gain has been finished the instrument range and has automatically been cut off, and has improved the automaticity that instrument detects.
Claims (8)
1, ion chromatograph signals collecting and treating apparatus is characterized in that being provided with:
Driving pulse produces circuit;
Conductance cell, its two electrode connect the output terminal that driving pulse produces circuit;
The weak signal amplifying circuit, the solution conductivity signal output part at its input termination conductance cell two ends;
Sampling hold circuit, the output terminal of its input termination weak signal amplifying circuit;
The secondary amplifying circuit, the output terminal of its input termination sampling hold circuit;
The A/D Acquisition Circuit, the output terminal of its multi pass acquisition on-off circuit input termination secondary amplifying circuit;
The single-chip microcomputer treatment circuit, its input interface connects the output terminal of A/D Acquisition Circuit, and its control signal output ends mouth connects the multi pass acquisition on-off circuit of A/D Acquisition Circuit;
The output display circuit, its input end connects the output interface of single-chip microcomputer treatment circuit.
2, ion chromatograph signals collecting as claimed in claim 1 and treating apparatus is characterized in that establishing signal pre-processing circuit between sampling hold circuit output terminal and secondary input amplifier.
3, ion chromatograph signals collecting as claimed in claim 1 and treating apparatus, it is characterized in that between secondary amplifying circuit and A/D Acquisition Circuit, establishing signal switching circuit, establish temperature sensing circuit between conductance cell and signal switching circuit, the temp probe of temperature sensing circuit is located in the conductance cell.
4, ion chromatograph signals collecting as claimed in claim 1 and treating apparatus is characterized in that establishing gain control circuit in the weak signal amplifying circuit.
5, ion chromatograph signals collecting as claimed in claim 1 and treating apparatus is characterized in that establishing sampling and keep pulse control circuit in sampling hold circuit.
6, ion chromatograph signals collecting as claimed in claim 1 and treating apparatus is characterized in that establishing D/A button substrate circuit between secondary amplifying circuit and single-chip microcomputer treatment circuit.
7, ion chromatograph signals collecting as claimed in claim 1 and treating apparatus is characterized in that establishing optical coupling isolation circuit between analog detection disposal system that weak signal amplifying circuit, sampling hold circuit, secondary amplifying circuit, signal switching circuit are formed and digital collection disposal system and single-chip microcomputer treatment circuit.
8, ion chromatograph signals collecting as claimed in claim 1 and treating apparatus is characterized in that establishing the hardware check reference signal generating circuit at the weak signal input amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031308589A CN1297816C (en) | 2003-05-15 | 2003-05-15 | Signal collecting and processing apparatus for ion chromatograph |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031308589A CN1297816C (en) | 2003-05-15 | 2003-05-15 | Signal collecting and processing apparatus for ion chromatograph |
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| CN1548956A CN1548956A (en) | 2004-11-24 |
| CN1297816C true CN1297816C (en) | 2007-01-31 |
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| CNB031308589A Expired - Fee Related CN1297816C (en) | 2003-05-15 | 2003-05-15 | Signal collecting and processing apparatus for ion chromatograph |
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| CN102854275B (en) * | 2012-07-29 | 2014-11-12 | 安徽皖仪科技股份有限公司 | Ion chromatography digital conductance detecting device based on digital signal processor (DSP) |
| CN105374265B (en) * | 2015-12-15 | 2018-05-22 | 徐州医学院 | A kind of high performance liquid chromatograph experimental teaching model of cobalt and experimental method |
| WO2017115841A1 (en) * | 2015-12-29 | 2017-07-06 | 株式会社アイスティサイエンス | Analysis preprocessing method for sample containing multiple constituents in significantly different concentrations |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2033514U (en) * | 1988-06-09 | 1989-03-01 | 成都科技大学 | Low-pressure ion chromatograph for cation analysis |
| CN1034817A (en) * | 1988-02-05 | 1989-08-16 | 南京新技术应用研究所 | Multi-user chromatographic data processor |
| JP2000310624A (en) * | 1999-04-28 | 2000-11-07 | Shimadzu Corp | Data processing device for chromatograph |
-
2003
- 2003-05-15 CN CNB031308589A patent/CN1297816C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034817A (en) * | 1988-02-05 | 1989-08-16 | 南京新技术应用研究所 | Multi-user chromatographic data processor |
| CN2033514U (en) * | 1988-06-09 | 1989-03-01 | 成都科技大学 | Low-pressure ion chromatograph for cation analysis |
| JP2000310624A (en) * | 1999-04-28 | 2000-11-07 | Shimadzu Corp | Data processing device for chromatograph |
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