CN2076667U - Recording instrument for blended data - Google Patents
Recording instrument for blended data Download PDFInfo
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- CN2076667U CN2076667U CN 90215373 CN90215373U CN2076667U CN 2076667 U CN2076667 U CN 2076667U CN 90215373 CN90215373 CN 90215373 CN 90215373 U CN90215373 U CN 90215373U CN 2076667 U CN2076667 U CN 2076667U
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- relay
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Abstract
The utility model relates to a recording instrument for blended data. The recording instrument for blended data is provided with twelve input passages and each passages of the recording instrument for blended data can respectively measure any one of thermocouple, direct current voltage and processing current in five kinds of B, T, S, E, K. The temperature measuring section can be arbitrarily arranged within the range of each highest temperature of the thermocouples. The types of the thermocouples can be independently changed. The recording instrument for blended data can carry out an analogue record, or a trend record, or a listing record, or an alternating record, and the records can be displayed on a panel. The recording instrument for blended data adopts a thermosensitive print mode and the reliability is high. The recording instrument for blended data is a microcomputer data recorder which can replace an automatic balancing recorder and a digital temperature display instrument.
Description
The utility model relates to data acquisition, processing, recording technique, or rather, is a kind of with kind being used to measure d. c. voltage signal, the recorder of the microcomputerization of process current signal and temperature.
At present, to be widely used in what measure temperature signal be the self-balancing recorder of electric bridge or potential difference meter formula industrial, or the temperature digital Displaying Meter, exists following deficiency:
1. single gauge, the single cooperation, instrument can only a kind of thermopair of adapted (or thermal resistance), if change thermopair (or thermal resistance), or change temperature-measuring range, and will change instrument face plate and measure bridge circuit, very inconvenience.
2. the instrument that has adopts the print record mode, does not have numeral to show; What statistics have shown does not have a print record, and data are preserved in inconvenience, and deficiency is respectively arranged in the use.
3. though the instrument that has is a figure punch, can not trend record, can not from record, intuitively find out variation tendency, can not satisfy the user that this special requirement is arranged.
4. indivedual instrument of developing recently, though overcome these shortcomings, complex structure, used components and parts are many, and reliability is low, costs an arm and a leg, and the user is difficult to accept.XMF-01 type datalogger, printing type adopts stylus printer mechanism, and reliability is lower, should not produce in a large number.
The instrument that abroad has, though the performance height, function is complete, costs an arm and a leg, domestic being difficult to popularized.
The purpose of this utility model is to provide a kind of according to user's needs, can write down the analog quantity curve, also can digital print record number word amount, and perhaps can the two mixed and alternate record; Can show with numeral again simultaneously, and can change thermopair kind and temperature-measuring range by keyboard, so components and parts spare is few, adopt thermal printing, the reliability height, low price is beneficial to and popularizes, and can substitute a kind of hybrid microcomputer data recording instrument of self-balancing recorder or digital temperature display instrument.
Accompanying drawing 1 is the utility model basic comprising synoptic diagram.
Accompanying drawing 2 is the utility model electrical schematic diagram.
Accompanying drawing 3 is a master routine.
Accompanying drawing 4 is a 50ms clock interrupt routine.
Accompanying drawing 5 is A/D conversion and zero-bit detection interrupt routine
Accompanying drawing 6 is for printing interrupt routine ()
Accompanying drawing 7 is for printing interrupt routine (two)
The utility model is finished as follows:
According to input end illustrated in figures 1 and 2 12 signal passages are arranged, its each channel terminals respectively with B, T, S, E, five kinds of thermopairs of K, wherein any of DC voltage and process electric current joins, measurement range can be free independent selected; And border set-up function flexibly arranged;
Data acquisition unit is under the computing of computing main control unit and handling, use the signal type of keyboard to set up by the user by each passage, selected different multiples, amplify by same amplifier, after the analog to digital conversion, by the computing main control unit signal is carried out zero, the two self-correctings processing of full scale, scale transformation, linearization process, calculate simulation and print the step number value, and the alarm condition of definite each passage, carry out respective handling, and give each corresponding buffer cell respectively, get the record variation tendency ready with analog quantity by the heat pen.Or tabulate and get digital quantity, or both alternately printings, and print each alarm condition, and print the depth and be recorded on the heat-sensitive paper adjustablely, be shown in panel.
(1) data acquisition unit is by CH
1～CH
12The collection lead; Resistance R
66～R
89, capacitor C
53～C
76The filter unit that constitutes; Resistance R
1～R
4, potentiometer W
1, W
2, integrated circuit 1403(T
33) reference cell that constitutes; Ic temperature transducer AD590(BG26), resistance R
5, R
6, potentiometer W
3The temperature compensation unit that constitutes; Resistance R
7～R
9, capacitor C
1～C
3, C
8Diode D
1, D
2, inductance L
1, relay J
17, operational amplifier OP-07(T
34) amplifier that constituted; Resistance R
31～R
33, capacitor C
23～C
28, potentiometer W
4, diode D
3, integrated circuit 1403(T
27), 7660(T
25), 7135(T
26) analog to digital conversion circuit that constitutes; Resistance R
55, R
65, diode D
4～D
35, relay J
1～J
16, photocoupler BG
3～BG
6The sampling switch and the diode D that constitute
36～D
39, resistance R
64With integrated circuit LS245(T
18), 2003A(T
22) control circuit that constitutes forms.
(2) computing and main control unit are by microprocessor integrated circuit 8031(T
1), address register LS373(T
3), decoding and chip select circuit LS138(T
2), communication interface circuit 1488(T
8), 1489(T
9), terminal management circuit LSO2(T
10) LS74(T
11), the ROM (read-only memory) EPROM27128(T of internal memory 16K
4), and the 2764(T of internal memory 8K
5), random access memory ram 6264(T
6), and electrically rewritable E
2PROM2864(T
7) and some resistance, electric capacity form.
(3) record cell is by integrated circuit 8255(T
16), 8155(T
15), LS08(T
12), 245(T
13), LS122(T
14), 7403(T
20), (T
21) triode BG
11～BG
17, BG
27, resistance R
61, R
56, R
24～R
30With thermal printing head P
1～P
7The print record system that constitutes and by integrated circuit LS245(T
23) resistance R
16～R
23, R
57～R
60Diode D
48～D
51Chart drive motor A
1B
1C
1D
1, balladeur train motor A
2B
2C
2D
2The paper feed that constitutes, slide block mechanism is formed.
(4) set with display unit by 00H～13H, K
1The panel and keypad of forming is by triode BG
18～BG
25, charactron LED D
40～D
47, resistance R
90～R
97, show and keyboard/display interface 8279(T
17) and 2003A(T
31) (T
32), LS138(T
38) (T
30) and resistance R
37～R
44Form.
(5) alarm unit is by integrated circuit 8255(T
16) some, LS06(T
19), diode D
52～D
55With alarm relay RL
1～RL
4, loudspeaker Y is formed.
(6) power supply is provided+5V by switching power supply, ± 12V, ± 9V ,+26V.
Below with reference to accompanying drawing the utility model is described in further detail.
Collected lead CH
1～CH
12Can with five kinds of thermopair B(600 ℃～1800 ℃), T(-150 ℃～350 ℃), S(0 ℃～1700 ℃), E(0 ℃～900 ℃), K(0 ℃～1300 ℃), two kinds of DC voltage (20mV～+ 20mV,-100mV～+ 100mV), two kinds of process electric current (0～10mA; 4mA～20mA) is any being connected in totally 9 kinds, and inserts external signal kind, printing type and temperature section by keyboard, and the messages such as requirements of reporting to the police are even this information outage still can long preservation, except that leaveing no choice but change once more.The J that ten two road input signals can be controlled by controlled circuit successively
5～J
16Relay enters amplifier T in turn
34(OP-07) input end, according to the input different token types by relay J
17Control different enlargement factor (20 or 100 times).Before each image data, by integrated circuit 1403(T
33), resistance R
1～R
4Potentiometer W
1, W
2The reference cell that constitutes.At R
3With R
4The junction produces the 100mV baseline signal, with relay J
3End points joins, as 100mV full scale self-correcting signal.At R
1With R
2The junction produces the 20mV baseline signal, with relay J
2End points joins, as 20mV full scale self-correcting signal.Relay J
1Two end points short circuits are worked as relay J
1During adhesive, make amplifier T
34The self-correcting signal is spent in addition as amplifier in the short ground of input end.This instrument cold junction compensation adopts ic temperature transducer AD590(BG
26) output current rising characteristic (1 μ A/ ℃) is surveyed the environment temperature way with the temperature rising, then by software approach, the cold junction compensation value of searching (near room temperature) pairing TCS under the current cold junction temperature from internal memory---mV value.Compensate for corresponding signal.
Before 12 passages are gathered signal, spend self-correcting (relay J in addition
1Adhesive), 20mV full scale self-correcting (J
2The relay adhesive), 100mV full scale self-correcting (J
3And definite cold junction compensation value (relay J the relay adhesive),
4Adhesive).By two self-correctings, improved this machine precision, overcome the device temperature and float with other and float influence precision.
Controlled circuit control, relay J
1～J
16One road signal of its adhesive enters amplifier T
34Input end passes through resistance R through amplifying 20 times (or amplifying 100 times)
33Through going into integrated circuit 7135T
26A/D converter.
Each switching of gathering period is CPU8031(T
1) pass through 8155(T
15) PA
7～PA
8Composition 4 * 4 matrixes are controlled 8155 CP
5Be used to control enlargement factor K(and work as PC
5=1 o'clock, relay J
17Adhesive, enlargement factor K=20, PC
5=0 o'clock, K=100.) work as PA
5=1 when being high level, then photocoupler BG
4PA is worked as in conducting again
0=1, anti-phase back is a low level, makes diode D
12And relay J
5Conducting, relay J
5The contact adhesive, CH
1The signal of gathering the lead collection enters amplifier, and the rest may be inferred by analogy.
The main control unit of this instrument is with T
1, 8031 one chip microcomputers are core, integrated circuit 27128(T
4), 2764(T
5) form the memory under program of 24K internal memory, integrated circuit 6264(T
6), 2864(T
7) form the data memory of 16K internal memory, 8279(T
17) form and can compile keyboard/display interface, integrated circuit 8155(T
15) RAM/I
0Expansion and timer have been formed the control of collection period, and the temperature-sensitive pen is got control ready, the control interface of sound equipment and unit pilot lamp; 8255(T
16) programmable parallel interface formed the startup of A/D conversion and obtaining of value, the control interface of chart drive motor, penholder motor and the output relay of respectively reporting to the police.This instrument is undertaken by interrupt mode with the external unit information interchange.Have 6 interruptions, be respectively: detect to interrupt other position and the A/D conversion is interrupted, and taking jointly that the INT0(of CPU is promptly outer can middle fracture); Print and interrupt taking CPU timer/counter T
0Interrupt; Interruption of 50mS clock and keyboard interrupt take the INT of CPU jointly
1(being external interrupt 1) master routine initialization interrupts taking the timer/counter T of CPU
1Interrupt, make the charactron flicker.
T
29(LSOO) form crystal oscillating circuit, produce the 6.4MHZ oscillation frequency and directly supply CPU(8031) clock usefulness, 6.4MHZ also delivers to T
28Frequency division produces 400KHZ for 8279(T
17), 100KHZ is for A/D converter 7135(T
26), 50KHZ is for CPU Timer T
0, T
1Counting is used; 25KHZ is for 8155T
15, count once more in T through inside and to go out to produce the 50mS square-wave signal, as the clock reference count value.
T
4(27128) memory under program, the storage address is the program of 0000H～3FFFH, T
5(2704) memory under program, the program of storage 4000H～5FFFH, T
2(LS138) be of the gating decodings of 318 code translators as RAM and each interface chip.
T
3(LS373) eight D-latchs latch the least-significant byte address; T
12(LS08) two inputs just are used for CPU control signal RE, WR, the driving of PSEN, T with door
13(LS245) eight bus transceivers transmit driver as the data message of CPU and each peripheral hardware.
A/D converter adopts 7135(T
26) by 7135 requirements, by T
25(7660) generation-5V power supply needs T for 7135
24(LS157) four alternative data selectors (are D by selecting control (1 pin of LS157 class)
5) distinguish and select myriabit still to select other positions, D
5～D
1Be respectively ten thousand, thousand, hundred, ten, individual data drive signal end, STROBE is the signal gating end, by this gating end produce strobe pulse "
", can be sent to the binary-coded decimal data 8255 PB mouth.R/H end is held for the startup of A/D converter/maintenance, can make A/D converter work or quits work by this end.4 pin are the integration end, can be observed A/D converter double integrator signal, INHD(10 pin at this pin) be input end of analog signal, after the collection, enter A/D converter by this pin through amplifier.
8255 and (T
26) data between the A/D conversion transmit is that to be provided with 8255 be 1 working method (being the gating working method) in case the STROBE signal is arranged, and then 8255 produce IBF signals (input register full signal) automatically ... till RD reads in.
Before this instrumentation, at first to pass through 8279(T
17) each relevant running parameter is set, 8279 have been changed to the chain scanning work mode of two keys (in the scanning secondary, all be that this singly-bound closure is then effective promptly, otherwise invalid) by software in advance, and in case singly-bound is pressed into, then 8279 IRQ produces high level automatically.The FIFO(first in first out of 8279 inside) register has been deposited effective key assignments of pressing.
CPU accept and the response keyboard interrupt after, promptly read in this key assignments, carry out relevant keyboard program by this key assignments, carry out and finish, will wait for new key signal, until pressing initiate key, or end key.After reading 8279 key assignments, the always automatic step-down level of IRQ is unless there is new key to be pressed in addition at every turn.The user deposits 2864(T in mostly by the parameter of keyboard input
7) among, have only " time-division " in the clock to deposit 6264(T in
6) among.T
36(LS00 two inputs four positive Sheffer stroke gates) are to be used for still effectively being preserved in energising and the content of the moment 2864 of cutting off the power supply.
All set ready after, instrument will be carried out operate as normal, the start back is carried out master routine earlier, to each external chip or respectively mark the unit and carry out initialization, sees wherein ADC of master routine (accompanying drawing 3)
1Be the data bit counter; ADC
2For gathering the period counter; ADC
3Be the deposit data counter; MDC
1For delegation's resting period counter is printed in simulation; MDCD carries out counter for the simulation time-write interval; CDC carries out counter for 2 time intervals of tabulation.Opens interrupters then, in case there is the 50mS clock to interrupt, then this interrupt routine not only will calculate real-time time, and the result is put each time memory cell, also will require to start A/D switching time according to A/D and change; Start printing according to the requirement of simulation time-write interval; Display routine is called in time requirement according to data presentation; Start markers according to markers time requirement and print, (seeing accompanying drawing 4 for details) 50mS clock interrupt routine block diagram, wherein: RmS is a 50mS counter; RS is a second counter; R
3S is a second individual counter; RMIN is a minute counter; RH is a hour counter; RDAY is a daily counter; RYEAR is a year counter; RMON is a month counter.In case start the A/D conversion and behind the A/D EOC, to produce 5 A/D conversions continuously in turn and interrupt, this interrupt routine will read this point value, and carry out A/D conversion next time and prepare, then this value is carried out various conversion process by this some requirement, deposit corresponding units in.When touring all collection the once finishes, then tabulate two or simulation print, each result deposits corresponding units in, for showing or printing usefulness for data or for simulation, sees that accompanying drawing 5A/D conversion and other position detect the interrupt routine block diagram.BJ * C in the block diagram
1Be balladeur train present position counter; ADC
1Be data bit counter, ADC
2For gathering the period counter; ADC
3Be the deposit data counter; D
01For other point value of 20mV is deposited impact damper; D
02For other point value of 100mV is deposited impact damper; DF
1For the 20mV value of working to the last minute is deposited impact damper; DF
2For the 100mV value of working to the last minute is deposited impact damper; Ta deposits impact damper for the cold junction temperature value; Wherein the location recognition of penholder when mainly being meant each the printing is detected in other position, prints accumulated error to eliminate simulation.The so-called startup printed among the 50mS, is actually to be provided with respectively to print sign, and passes through T
0Time delay produces to print interrupts, whether each printing is always differentiated each print point position and will be printed, drive penholder then and move to the position of wanting print point recently, then give each print value, postponing certain hour (promptly printing pulsewidth) then cools off, carry out the second time and print, be all over, interrupt and close to print until each tabulation or simulation printing.Certainly, the moving and the action of paper advance mechanism of penholder in the printing all will have certain coordination in print routine, sees accompanying drawing 6 for details and prints interrupt routine () accompanying drawings 7 and print that PBRC is the print state counter in interrupt routine (two) block diagrams; PTD is that print data is deposited counter; STRC is for printing depth counter; PAPER is a paper feed step number counter; BJXC1 is a penholder present position counter; BMAX2 is a walking maximal value counter; DDTR0 is unit, the first location of forehand printing word character string; DDTR1 is for printing unit, the first location of digit strings; DRC is the character ordinal number counter; PRIC is the pin counter; MPR1 is simulation print point numerical value; MPR2 is simulation stamped mark number; MPR3 prints period for simulation; STBC is the step counter; ALAR2 is the print-on-alarm pointer; R
24Be each zone bit.
Print or data etc. when printing in simulation, relate to four motors mutually of paper feed and balladeur train, adopt two two to clap working methods, be to realize by the control signal that 8255 PA mouth is sent respectively, wherein the balladeur train motors are controlled in PA7～4, PA3～0 control chart drive motor, and these signals are through T
23(LS245) eight bus transceivers are to sledge drive unit B G
8～BG
11And the 2003A of paper feed driver element drives balladeur train motor A
2B
2C
2D
2Or chart drive motor A
1B
1C
1D
1Work.
T
14(LS122) be used to protect working time of printhead, promptly each the printing sent when several, simultaneously to T
14(LS122) give "
" information, then produce a single steady signal at the Q of LS122 end
The about 3mS of pulsewidth, even guaranteed printhead under software cas fortuit out of control, the ON time of thermal print head will not surpass 3mS.
After implementing the utility model,, simplified physical construction, processed other part and significantly reduce because of adopting the thermal printing scheme.Give full play to software function in the instrument, the large scale integrated circuit use amount reduces in a large number in making, only be XMF-01 type datalogger 1/2 less than, price also be it 1/2 less than, and reliability improves greatly.
Claims (10)
1, a kind of hybrid datalogger, by data acquisition unit, computing main control unit, setting and display unit, record cell, driving alarm unit and power supply are formed, it is characterized in that: input end has 12 signal passages, its each channel terminals respectively with B, T, S, E, five kinds of thermopairs of K, wherein any of DC voltage and process electric current joins, and measurement range can be free independent selected; And have flexibly that the border is provided with function; Data acquisition unit is under the computing of computing main control unit and handling, by the signal type of each passage by user's keyboard to set up, selected different multiples, amplify by same amplifier, after the analog to digital conversion, by the computing main control unit signal is carried out zero, the two self-correctings of full scale are handled, scale transformation, linearization process, calculate the alarm condition that simulation is printed the step number value and determined each passage, carry out respective handling, and give each corresponding buffer cell respectively, get the record variation tendency by the heat pen ready with analog quantity, or tabulation gets digital quantity, or both alternately print and print each alarm condition, prints the adjustable ground of the depth, be recorded on the heat-sensitive paper, be shown in panel;
(a) data acquisition unit is by the collection lead of CH1～CH12; Resistance R 66～R89, the filter unit that capacitor C 53～C76 constitutes; Resistance R 1～R4, the reference cell that potentiometer W1, W2 integrated circuit 1403 (T33) constitute; Ic temperature transducer AD590 (BG26), resistance R 5, R6, the temperature compensation unit that potentiometer W3 constitutes; Resistance R 7～R9, capacitor C 1～C3, C8 diode D1, D2 inductance L 1, relay J 17, the amplifier that operational amplifier OP-07 (T34) is constituted; Resistance R 31～R33, capacitor C 23～C28, potentiometer W4, diode D3, integrated circuit 1403 (T27), (T26) analog to digital conversion circuit of (T25) formation; Resistance R 55, R65, diode D4～D35, relay J 1～J16, sampling switch and diode D36～D39 that photocoupler BG3～BG6 constitutes, resistance R 64 and integrated circuit LS245 (T18), the control circuit that 2003A (T22) constitutes is formed;
(b) computing and main control unit are by microprocessor integrated circuit 8031 (T1), ground, ground working storage LS373 (T3), decoding and chip select circuit LS138 (T2), communication interface circuit 1488 (T8), 1489 (T9), terminal management circuit LS02 (T10) LS74 (T11), the electrically programable ROM EPROM27128 of internal memory 16K (T4), and 2764 (T5) of internal memory 8K, random access memory ram 6264 (T6), and electrically rewritable E
2PROM2864 (T7) and some resistance, electric capacity are formed;
(c) record cell is by integrated circuit 8255 (T16), 8155 (T15), LS08 (T12), 245 (T13), LS122 (T14), 7403 (T20), (T21), triode BG11～BG17, BG27 resistance R 61, R56, R24～R30, with the print record system of thermal printing head P1～P7 formation with by integrated circuit LS245 (T23) resistance R 16～R23, R57～R60, diode D48～D51 chart drive motor A
1B
1C
1D
1Balladeur train motor A
2B
2C
2D
2The paper feed, the slide block mechanism that constitute are formed;
(d) set with display unit by OOH～13H, K
1The panel and keypad of forming, by triode BG18～BG25, charactron LEDD40～D47, resistance R 90～R97 show and keyboard/display interface 8279 (T17), reach 2003A (T31) (T32), LS138 (T38) (T30) and resistance R 37～R44 form;
(e) alarm unit is by integrated circuit 8255 (T16) some, LS06 (T19), diode D52～D55 and alarm relay RL
1～RL
4, loudspeaker Y is formed;
(f) power supply is provided+5V by switching power supply, ± 12V, ± 9V ,+26V.
2, hybrid datalogger according to claim 1 is characterized in that, described calibration number for B, T, S, E, its maximum measurement range of five kinds of specification thermopairs of K is:
B：600℃～1800℃
T：－150℃～350℃
S：0℃～1700℃
E：0℃～900℃
K：0℃～1300℃。
3, according to claim 1 and 2, described hybrid datalogger is characterized in that the thermopair of described different calibration number, and it is measured temperature section and can set arbitrarily by keyboard and import in maximum temperature range separately.
4, hybrid datalogger according to claim 1, it is characterized in that described dc voltage measurement scope be-20mV～+ 20mV and-100mV～+ 100mV.
5, hybrid data instrument registering instrument according to claim 1 is characterized in that described process electric current, and its measurement range is 0～10mA and 4mA～20mA.
6, hybrid datalogger according to claim 1 is characterized in that describedly by the selected different multiples amplifying signal of unlike signal type, and its enlargement factor by relay J 17 controls is respectively 20 and 100.
7, hybrid datalogger according to claim 1, it is characterized in that the two self-correctings processing of described other, full scale, it is spent self-correcting in addition and is realized that by the adhesive of J1 relay the self-correcting of 20mV full scale realizes that by the adhesive of J2 relay the self-correcting of 100mV full scale is realized by the adhesive of J3 relay.
8, hybrid datalogger according to claim 1 is characterized in that each alarm condition of described printing is that instrument can be to report to the police taking place constantly or report to the police cancel and constantly carry out real time print, and prints each warning mark, period, and actuating relay number.
9, hybrid datalogger according to claim 1 is characterized in that describedly having flexibly the border that function is set to be not only can be set to the right dividing value greater than left side dividing value, left side dividing value also can be set greater than the right dividing value.
10, hybrid datalogger according to claim 1, it is characterized in that the described printing depth adjustable be to print the degree of depth 1～4 retaining is arranged, can select for use by software.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90215373 CN2076667U (en) | 1990-10-15 | 1990-10-15 | Recording instrument for blended data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90215373 CN2076667U (en) | 1990-10-15 | 1990-10-15 | Recording instrument for blended data |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2076667U true CN2076667U (en) | 1991-05-08 |
Family
ID=4894667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90215373 Expired - Lifetime CN2076667U (en) | 1990-10-15 | 1990-10-15 | Recording instrument for blended data |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2076667U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100349169C (en) * | 2005-03-01 | 2007-11-14 | 北京同方微电子有限公司 | Power management circuit for non-contact IC card reading apparatus |
| CN100349170C (en) * | 2005-03-01 | 2007-11-14 | 北京同方微电子有限公司 | Modulation circuit for non-contact IC card reading apparatus |
| CN102269779A (en) * | 2011-06-22 | 2011-12-07 | 哈尔滨电工仪表研究所 | Voltage fluctuation recording device based on DLMS (distribution line message specification)/COSEM (companion specification for energy metering) |
| CN106940225A (en) * | 2017-03-07 | 2017-07-11 | 苏州西顿家用自动化有限公司 | A kind of cooking stove temperature display control method |
-
1990
- 1990-10-15 CN CN 90215373 patent/CN2076667U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100349169C (en) * | 2005-03-01 | 2007-11-14 | 北京同方微电子有限公司 | Power management circuit for non-contact IC card reading apparatus |
| CN100349170C (en) * | 2005-03-01 | 2007-11-14 | 北京同方微电子有限公司 | Modulation circuit for non-contact IC card reading apparatus |
| CN102269779A (en) * | 2011-06-22 | 2011-12-07 | 哈尔滨电工仪表研究所 | Voltage fluctuation recording device based on DLMS (distribution line message specification)/COSEM (companion specification for energy metering) |
| CN106940225A (en) * | 2017-03-07 | 2017-07-11 | 苏州西顿家用自动化有限公司 | A kind of cooking stove temperature display control method |
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