CN2148335Y - High/low speed transient waveform acquisition analyser - Google Patents
High/low speed transient waveform acquisition analyser Download PDFInfo
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- CN2148335Y CN2148335Y CN 93200039 CN93200039U CN2148335Y CN 2148335 Y CN2148335 Y CN 2148335Y CN 93200039 CN93200039 CN 93200039 CN 93200039 U CN93200039 U CN 93200039U CN 2148335 Y CN2148335 Y CN 2148335Y
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- low speed
- transient waveform
- data acquisition
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Abstract
The utility model relates to a transient waveform acquisition analyser, comprising at least one sensor used for detecting physical quantity, an amplifier used for amplifying a signal from the sensor, a data acquisition plate used for carrying out the data acquisition for the electric signal which is amplified, and a PC computer. The data acquisition plate is inserted in the I/O expansion slot of the computer. The volume is small. The transient waveform acquisition analyser is provided with a high speed passage and a low speed passage. A high frequency transient waveform signal and a low speed transient waveform signal can be collected and analysed by a real-time mode by the transient waveform acquisition analyser.
Description
The utility model relates to a kind of transient waveform analysis instrument, be particularly related to and a kind of high speed/low speed analog/digital (A/D) converter and storer be made on the wiring board, directly insert in the I/O expansion slot of pc machine, can carry out the analyser of transient waveform collection and data processing at once.
The transient waveform collection analysis is widely used in fields such as oil, geology, water conservancy, building, nuclear energy.A kind of block diagram of traditional waveform acquisition analyser as shown in Figure 1, sensor detects various physical signallings, as speed, pressure, acceleration etc., becomes electric signal (voltage or current signal).This electric signal simulated magnetic tape station institute record after amplifier amplifies.Deliver to the digital quantity that analog/digital (A/D) converter is converted to signal then, again the data of obtaining are delivered to computing machine and gone to handle.Fig. 2 is another kind of traditional transient waveform analysis instrument, sensor detects various physical signallings and changes electric signal into, this electric signal is delivered to digital storage oscilloscope after amplifier amplifies, Wave data is carried out digitizing, storage or demonstration, and oscillograph has interface to be connected with computing machine.
The shortcoming of transient waveform analysis instrument shown in Figure 1 is: obtain and the processing of data of data are separately carried out, and are unsuitable for carrying out real-time analysis at operation field; Moreover analogue magnetic recorder is not enough to the frequency response of high-speed transient signal, and has only the signal record function, does not have data processing function.
The shortcoming of waveform analyzer shown in Figure 2 is: need cost an arm and a leg and the bigger digital storage oscilloscope of volume, oscillograph only has the temporary transient storage and the display capabilities of Wave data, does not possess data-handling capacity.
The purpose of this utility model provides a kind of waveform acquisition analyser, wherein high speed/low-speed a/d converter and storer are made on the wiring board that calls data acquisition board and are inserted on the pc computing machine, make the collection of Wave data and handle under the management of computing machine, to walk abreast and carry out, can carry out the analysis of collection, record and the data of on-the-spot transient waveform.
Another object of the present invention provides a kind of waveform analyzer, has the four-way at least of high speed/low speed, is widely used in the collection and the data processing of the high low speed transient waveform of different field.
Waveform acquisition analyser of the present utility model comprises: at least one sensor that is used to survey physical quantity, one is used to amplify the amplifier from sensor signal, the data acquisition board that the electric signal that amplifies is carried out data acquisition, with a pc computing machine, it is characterized in that: described data acquisition board comprises high-speed channel and low speed passage, described high-speed channel comprises an input circuit, be used to import signal from described amplifier, one high-speed a/d converter, be connected to described input circuit, be used for high speed analog signal is converted to digital signal, a storage arrangement is connected in described A/D converter, be used for the storage digital signal of surveying, and a parallel input/output port, be connected in described storage arrangement, be used to realize being connected of data acquisition board and computing machine.Described low speed passage comprises: an analog switch is used to receive low speed input signal, a level shifting circuit, be connected in analog switch, a low-speed a/d converter is connected in level shifter, be used for signal is become digital signal, directly deliver to computing machine and handle.Described two high speed channel circuits of the present utility model are input to A/D from signal and are transformed into storer and isolate fully, two sampling channels identical two cover circuit have been adopted, every channel sample speed is 1MHZ, the chip of used A/D converter is TDC1001, the chip of the A/D converter of low speed passage is ADC0804, data acquisition board of the present utility model also comprises the internal trigger device, the external trigger device, the numerical control device of activation threshold value and triggering lead, described data acquisition board is directly inserted the I/O expansion slot of pc machine, realizes the collection of signal by the control of computing machine.High-speed channel can guarantee the data acquisition of fast signal up to the sampling rate of 1MHZ, its every passage 4K bytes store amount guarantees the record of transient signal.And slow-changing signals can be gathered by the low speed passage, and low speed channel sample frequency is divided fourth gear 10,100,200,1000HZ, is selected by computer control.Can write down the high low speed signal of four passages simultaneously and deliver to Computer Processing, and pass through the control function of pc machine, the collection of data is carried out with processing is parallel, and make move, compress, the calculate peak value and frequency and waveform drafting of waveform become possibility.
The utility model has the advantages that:
The data acquisition function plate directly is inserted on the pc machine, makes the hardware configuration of whole waveform analyzer simple, and can make full use of the function of computing machine; Because waveform acquisition and data processing can walk abreast and carry out, and have improved work efficiency; In conjunction with the software engineering of computing machine, make the simple to operate of this waveform analyzer, easy to use, wave form analysis is more accurate effectively.Applied range is applicable to catching and handling of each field high low speed transient state dynamic load signal.Near region, quick-fried source transient state high frequency detonation stresses involves collection, record, the analysis of far field low-frequency vibration ripple during particularly to explosion.
Below, describe the realization of the purpose of this utility model in conjunction with the accompanying drawings in detail:
Fig. 1 is a kind of block diagram of prior art waveform analyzer.
Fig. 2 is the block diagram of another kind of prior art waveform analyzer.
Fig. 3 is the block diagram of the utility model waveform analyzer.
Fig. 4 is the signal flow graph of data acquisition board of the present utility model.
Fig. 5 is the block diagram of the utility model data acquisition board.
Fig. 6-the 11st, the wiring diagram of the utility model data acquisition board.
Fig. 3 is the schematic diagram of the transient waveform acquisition and analysis instrument of utility model.Wherein 1 is sensor, the effect of sensor is to be used to survey various physical signallings, as displacement, speed, acceleration, pressure, strain etc., and they are become electric signal (voltage, electric current), the electric signal that comes out from sensor is sent to amplifier 2 and amplifies, amplifier commonly used has voltage amplifier, charge amplifier, high dynamic strain indicator, signal conditioner etc., and the amplifying signal that comes out from amplifier is sent to the microcomputer that has data acquisition board and handles.In the solution of the present invention, sensor, amplifier and microcomputer all are to have bought from market.For this professional those of ordinary skill, the connection between them also all can not need creative work to finish.
Fig. 4 is the signal flow graph of data acquisition board of the present invention, from the input signal Ui of amplifier if high speed signal then enters high-speed channel, if low speed signal then enters the low speed passage; Below we describe respectively, high speed input Ui(H from amplifier) signal enters input circuit, making Ui(H) conversion of signals is the signal that is suitable for A/D conversion, and deliver to A/D converter and carry out mould/number conversion, analog signal conversion becomes to deliver to RAM behind the digital quantity temporary, this is because the lower pc machine of some dominant frequency, can not utilize the way of software programming for the sample frequency of 1MHZ, each transformation result is delivered at any time the internal memory of computing machine.Therefore, in interface circuit, be provided with a RAM data working storage and preserve the total data that the sampling transient waveform obtains, then sampled data is read in calculator memory.
Enter A/D converter from the low speed input signal of amplifier by analog switch and carry out analog to digital conversion, transformation result is sent into calculator memory at any time with the way of software programming and is handled.The low speed passage is totally independent of high-speed channel.
For transient waveform acquisition and analysis instrument of the present utility model can be worked better, can also increase the digital control circuit of internal trigger, external trigger, activation threshold value and triggering lead.
Fig. 5 is the block diagram of utility model digital collection plate.This collection plate can be measured four road signals simultaneously, as high speed signal Ui(H1) and Ui(H2), low speed signal Ui(L1) and Ui(L2).In order to avoid each road mutual interference among signals as far as possible, the high-speed sampling passage is transformed into storer from the input circuit to A/D, adopted identical two cover circuit.Trigger circuit also are shown among Fig. 5, trigger lead circuit and activation threshold value circuit.Fig. 6-the 11st, the wiring diagram of Fig. 5 data acquisition board.Below in conjunction with Fig. 5-Figure 11 in detail, the groundwork process of high-speed a/d data acquisition of the present utility model is described in detail.
At first, by the signal wire in the software program set I/O expansion slot of computing machine, through the parallel input/output port 8255 of decoding scheme gating, with PA, PB, the initialization of PC mouth of parallel input/output port.PA, PB mouth are changed to input mode, and following PC mouth (PC3-PC0) is changed to the way of output, are used for selecting at a high speed or low speed sampling, internal trigger or external trigger working method, and sample or send number state, and address counting unit is in addition clear.Last PC mouth is made as input mode, and whether superthreshold and sampling finish to be used for detecting the Ui signal.
The course of work of high-speed sampling circuit:
A. writing under the state:
The external trigger working method, trigger pip is provided by the scene, this moment, PC0(was outer/inner)=1, the PC1(number of sampling/send)=0, PC2(is high/low)=1.After external trigger pulse comes, start flag flipflop U28(1) the Q end put 1, open the clock door.The high frequency clock signal of 20MHZ is sent to two-way A/D sampling channel through U14, begins sampling.Simultaneously, the 20MHZ signal is sent to two-way A/D sampling channel through U14, begins sampling.Simultaneously, the 20MHZ signal is delivered to A/D(U4 and U6 simultaneously with the frequency of 1MHZ behind U16, U1720 frequency division) starting end sc and the ck of address counter (U19, U20, U21) end, make address counter begin counting.Circuit deposits each sampled result in RAM(U8, U9, U10, U11 in proper order with 1 microsecond/each speed) in the corresponding address location.After finishing the sampling of 4k byte, address counter produces a carry pulse, starts flag flipflop U28 by U22 and goalkeeper and puts other again.Close the clock door, sampling stops.
The internal trigger working method, at this moment, PC0(is outer/inner)=0, PC1(gathers/send number)=0, PC2(is high/low)=1.At first threshold value latch U38, U39 squeezed in the threshold value control word, the lead control word is sent into lead latch U36, U37 by program.The triggering lead can be any number among the 0-4096.Give 368 ports, one negative pulse with program again, make startup flag flipflop U28 put 1 equally, circuit begins to sample from the internal trigger input end.Different with the external trigger working method is: if Ui does not surpass given threshold value, then this sampling process can be that a circulation ad infinitum continues with 4096, and the carry pulse of address counter can not make this sampling process stop.Simultaneously, computing machine detects Ui with inquiry mode and whether surpasses given threshold value Uy, in case | Ui|＞| Uy|, then computing machine can be squeezed into a negative pulse from 369 ports, thereby make former at U36, the triggering lead that keeps among the U37 is sent into lead counter U32, U33, U34, and from then on number begins to carry out the plus coujnt synchronous with address counter.In case the full 4k numerical value of this counter meter, then carry pulse can by U22 another with door, make to start flag flipflop U28 and reset, sampling stops.Calculate forward the address of the sampled result that deposit in the storer this moment when stopping to sample, deducting the data that deposit in the unit that presets lead by 4096 is | Ui|〉| the result that Uy| measures later on, and what deposit in remaining storage unit is that Ui surpasses the data before the threshold value, thereby triggers the requirement of lead when having realized internal trigger.
B. under read states:
At this moment, the PC1(number of sampling/send)=1.PA mouth, PB mouth by the parallel input/output port 8255 of program gating alternately read in internal memory with data from the ram cell of upper and lower two-way.During write operation, address count pulse and sampling pulse are synchronous, and two passages sequentially write corresponding memory with data separately.During read operation, the address count pulse produces (when carrying out an IN instruction, occurring a negative pulse on the IOR line) by the IOR signal of I/O expansion slot, and twice effective low level of IOR causes the once change of address pulse.
Through above process, can obtain the high-speed sampling digital quantity of 8 4K unit of two-way.After sampling finishes,, the 8K bit data sent in the pc machine handle according to computer instruction.
The sampling process of low speed signal:
The sampling of low speed signal only is suitable for the external trigger mode.After the external trigger signal comes,, selection Ui(L1 is set by program by parallel input/output port 8255-PC4 end input sign) or Ui(L2) input.Input signal shifts through level and sends into U42 ADC0804 and be transformed into digital signal and send into computing machine and store and handle.
The memory capacity of its sample frequency and every channel signal all can be provided with by software.
Claims (4)
1, transient waveform acquisition and analysis instrument, comprise at least one sensor that is used to survey physical quantity, an amplifier that is used to amplify from sensor signal, the data acquisition board that the electric signal that amplifies is carried out data acquisition, with a PC computing machine, it is characterized in that: described data acquisition board comprises high-speed channel and low speed passage; Described high-speed channel comprises: input circuit is used to import the high speed signal from described amplifier; (2.5MHZ) A/D converter is connected in described input circuit at a high speed, is used for high speed analog signal is converted to digital signal; The memory RAM device of each passage 4K is connected in described A/D converter, is used to store described digital signal; And parallel input/output port, be connected in described storage arrangement, be used to realize and being connected of computing machine; Described low speed passage comprises: an analog switch is used to receive low speed input signal; One level shifter is connected in analog switch; One low-speed a/d converter is connected in level shifter, and the numerical data that is used for directly output collection is given computing machine.
According to the transient waveform acquisition and analysis instrument of claim 1, it is characterized in that 2, the chip of the described A/D converter of described high-speed channel is TDC1001.
According to the transient waveform acquisition and analysis instrument of claim 1, it is characterized in that 3, the chip of the described A/D converter of described low speed passage is ADC0804.
According to the transient waveform acquisition and analysis instrument of claim 1, it is characterized in that 4, described data acquisition board also comprises the numerical control device of internal trigger device, external trigger device, activation threshold value and triggering lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93200039 CN2148335Y (en) | 1993-01-07 | 1993-01-07 | High/low speed transient waveform acquisition analyser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93200039 CN2148335Y (en) | 1993-01-07 | 1993-01-07 | High/low speed transient waveform acquisition analyser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2148335Y true CN2148335Y (en) | 1993-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93200039 Expired - Fee Related CN2148335Y (en) | 1993-01-07 | 1993-01-07 | High/low speed transient waveform acquisition analyser |
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| Country | Link |
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| CN (1) | CN2148335Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759675A (en) * | 2012-07-27 | 2012-10-31 | 深圳市中电软件有限公司 | On-line electric energy quality monitoring device |
-
1993
- 1993-01-07 CN CN 93200039 patent/CN2148335Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759675A (en) * | 2012-07-27 | 2012-10-31 | 深圳市中电软件有限公司 | On-line electric energy quality monitoring device |
| CN102759675B (en) * | 2012-07-27 | 2015-04-01 | 深圳市中电软件有限公司 | On-line electric energy quality monitoring device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |