Static disturbance signal recording system having detachable
Contents
1. the medical field monitor ing patients computer power supplies chemical indus try as well as the generation or conversion of energy What is claimed is 1 A disturbance signal recording system comprising a fixed unit located at a point suitable for detecting a disturbance said fixed unit including a processing signal means for continuously receiv ing input signals and outputting corresponding digital signals b pretriggering memory means for receiving and delaying said digital signals received from said processing signal means c disturbance detector means for receiving said digital signals from said processing signal means and detecting which ones of said digital signals are disturbance signals said disturbance detector means outputting first and second control signals at the beginning of each detected disturbance signal and a third control signal at the end of each de tected disturbance signal d solid state buffer memory means for recording from said pretriggering memory said ones of said digital signals which have been detected to be dis turbance signals by said disturbance detection means said recording occurring in response to a record control signal programmable control means for receiving said first and third control signals from said disturbance detector means and in response to said first control signal issuing said record control signal to said buffer memory means and in response to said thir2. 365 226 4 398 272 8 1983 Sibert 367 33 4 399 513 8 1983 Sullivan et al 364 551 4 417 306 11 1983 Citron et al 364 415 4 430 653 2 1984 Coon et al 343 5 NA OTHER PUBLICATIONS R Allen Microcomputer Assistance in Clinical Monitor ing of Intracranial Pressure Medical amp Biological Engi neering amp Computing May 1981 349 355 Primary Examiner Raulfe B Zache Assistant Examiner Archie E Williams Jr Attorney Agent or Firm Cushman Darby amp Cushman 57 ABSTRACT The system includes a basic recorder module where a delay element is followed by a solid state buffer mem ory digital interface circuits for transferring the re corded data processing means a printer and or mag netic memory unit a detachable programming terminal for the dialogue with the recorder and its programming as well as a separate power supply for the working part so that the latter is only supplied in the recording mode or during a connection of the programming terminal 10 Claims 6 Drawing Figures U S Patent Nov 12 1985 Sheet 1 of 3 4 553 223 SE E FiG_1 B4 19 Bn f EP 9 9 5 52 PART 1 MATCHING CIRCUITS 544 m iii 3 OISTURBANCE ME k i 50 u 6 CENTRAL UNIT AND PROGRAMMED MEMORY z 5 BUFFER POWER MEMORY SUPPLY lt
3. 1 or 2 wherein said storage recording means comprises a paper printer adapted to receive and print digital data in a graphic mode and in an alphanumeric mode 6 A system according to claim 5 comprising a plural ity of said fixed units connected across a connecting and multiplexing box to said storage recording unit wherein said plurality of fixed units are synchronized with one another or on the basis of a common external clock 7 A system according to any one of claims 3 4 1 or 2 wherein the storage recording means comprises a magnetic memory unit for a large capacity storage of successive disturbance data provided from the buffer memory means 8 A system according to claim 7 wherein the storage recording means also comprises a paper printing unit adapted to receive and print digital data in a graphic mode and in an alphanumeric mode 9 A system according to claim 8 comprising a plural ity of said fixed units connected across a connecting and multiplexing box to the magnetic memory unit and to the paper printing unit 10 A system according to any one of claims 3 4 1 or 2 comprising an emergency power supply for the time dating device said supply being constituted by an accu mulator charged by said first power supply
4. in such a way that the recording function has an absolute priority and the central unit interrupts the link between the recorder and its periph eral equipment when this is necessary It should also be noted that a test of satisfactory oper ation can be required by central unit 6 of recorder EP in connection with the peripheral equipment before or after each use or in a periodic manner in order to check that the system is ready to operate This test is received by the recorder in the form of a digital state word and is analyzed by central unit 6 and can lead to the operator being called when a fault is detected This call takes place by means of auxiliary circuits 9 The operator then has access to the state word characterizing the fault by using programming terminal TP For information pur poses auto test circuits 30 are shown in the processing part of FIG 1 said circuits serving to supply the digital state word corresponding to the satisfactory operation test on interrogation of the central unit 6 Circuits 30 can be designed in per se known manner and reference be made in this connection to the document liminary OEM Manual for a Floppy disk controller published by Scientific Micro Systems 777 East Middle field Road Mountain View Calif 94043 published Dec 9 1977 With regards to the magnetic memory unit UMM reference can be made e g to the document EX 801 820 Printers User Manual published by AX IOM Apri
5. is the end of recording The right hand diagram shows at 120 the test cause of the initialization of the EPT in the absence of distur bance Stage 121 represents the auto test operation triggered by circuit 30 of the processing part It can also represent a periodic test and automatic operation pro grammed by central unit 6 and initiated by a signal from the time dating device 7 Fault test 122 means that cen tral unit 6 interprets the test results and determines whether or not there is a fault In the affirmative the unit triggers off the alarm operation 123 by circuit 9 to the outside Stage 124 is the end of this sequence The final stage 125 represents an activation of the EPT from programming terminal TP i e the operator dialogue operation An disturbance signal recording system according to the invention provides the user with economic means as a result of its optimized design and modular structure compatible with all conventional informatics means for recording electric signals with random recurrences such as disturbance occurring in the transmission of electric power As a result of its digital design it is possi ble to remotely transmit data and directly process mag netic supports recorded by conventional informatics means However its use is not limited to the monitoring 4 553 223 9 of electricity systems The system can be used in re search laboratories the iron and steel industry e g power supply for furnaces
6. storage of data to be subsequently transmitted to the processing part said disturbance signal recorder also incorporating separate supply means for supplying the buffer memory and the auxiliary signal generator solely when distur bance or trouble is occurring dialogue and program ming means in the form of a detachable device digital 4 553 223 3 interface circuits constituting the said connection means between on the one hand the recorder and the process ing means and between on the other the recorder and the dialog and programming device BRIEF DESCRIPTION OF THE DRAWINGS The invention is described in greater detail hereinaf ter relative to non limitative embodiments and the at tached drawings wherein show FIG 1 a block diagram of an disturbance signal re corder system according to the invention FIG 2 a diagram of a first modular embodiment corresponding to the system of FIG 1 FIG 3 a diagram of a second modular embodiment which includes several fixed stations connected to a single exploitation unit FIG 4 a diagram of a third modular embodiment as in FIG 2 and which utilizes a peripheral magnetic memory FIG 5 a diagram of a fourth modular embodiment as in FIG 4 and which utilizes a peripheral magnetic memory FIG 6 a flowchart of a system according to the in vention DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disturbance signal trouble recorder system accord ing to the invention compris
7. P is shown in dotted line form because it is normally transported by the operator and is not involved in the normal operation of the recorder FIG 3 shows a variant of the proceding combination in which several disturbance recorders EP1 EP2 etc are combined with a single printer IP by the bias of a connection box BL serving as a multiplexing circuit in such a way that dialogue is successively possible with the different recorders EP1 EP2 etc connected by their synchronizing inputs outputs to an external clock HX The constructions according to FIGS 2 or 3 involve an operator moving or replacing the roll of paper This can be disadvantageous when movements are restricted so that recorder EP according to FIG 4 or recorders EP1 EP2 etc according to FIG 5 are connected across a connecting circuit BL in the latter option to a magnetic memory or store whose capacity can be very high e g several thousand seconds This amounts to introducing a third memory in the data chain namely unit UMM whose capacity is much higher than that of buffer memory 5 The user is able to choose the most suitable magnetic memory unit for his requirements as a function of the sought capacity and the environmental 4 553 223 7 conditions This is obviously particularly advantageous in the case of remote connection concepts when the management of one or in general several interfering signal recorders is centralized In this case it is neces sa
8. S4 12 AUX SIG GEN INTERFACES WORKING i PART PROGRAMMING TERMINAL 2 CHARACTER AUTO TEST 20 25 Y KEYBOARD CERIRAL ooon UNIT DISPLA PROCESSING gona 221 7724 U S Patent Nov 12 1985 Sheet20f3 4 553 223 Fic Fis PROGRAMMING TERMINAL MAGNETIC MEMORY UNIT U S Patent Nov 12 1985 110 lt gt YES 412 SH REGISTER gt gt FULL 143 gt SCRUTINY READ 1142 ORIENTING INTO MASS MEMORY CONTROL CALCULATIONS RECORDING FINISHED YES ui N 0 OUTPUT TO PERIPHERAL EQUIPMEN YES M7 TRANSFER TO PERIPHERAL EQUIPMENT Sheet 3 of 3 4 553 223 120 124 122 c 124 YES NO YES 1 5 42 OPERATOR DIALOGUE 4 553 223 1 STATIC DISTURBANCE SIGNAL RECORDING SYSTEM HAVING DETACHABLE PROGRAMMING TERMINAL amp PROGRAMMABLE FIXED PART WITH SELECTIVELY POWERED BUFFER MEMORY BACKGROUND OF THE INVENTION The present invention relates to disturbance signal recorders also called fault recorders These devices have two characteristic operating modes namely a watching mode during which only electrical input sig nals are monitored and a recording mode during which the electrical input signals are effectively recorded The start of recording is generally a few tenths of a second before the appearance of the disturbanc
9. United States Patent Bouhelier et al 54 STATIC DISTURBANCE SIGNAL RECORDING SYSTEM HAVING DETACHABLE PROGRAMMING TERMINAL amp PROGRAMMABLE FIXED PART WITH SELECTIVELY POWERED BUFFER MEMORY Francis Bouhelier Claude Vialatte both of Paris France 75 Inventors 73 Assignee Thomson CSF Paris France 21 Appl 395 313 22 Filed Jul 6 1982 30 Foreign Application Priority Data Jul 17 1981 FR sees 81 13977 51 Int 06 3 00 GO6F 11 30 GO6F 15 16 GO6F 15 20 2 US CL 25222 Rene 364 900 364 420 364 422 364 518 364 551 324 113 324 111 58 Field of Search 364 200 MS File 900 MS File 364 571 415 417 420 422 550 551 518 324 51 113 111 112 128 709 710 France 56 References Cited U S PATENT DOCUMENTS Re 31 222 4 1983 McCracken 364 571 4 161 782 7 1979 McCracken ees 364 571 4 216 462 8 1980 McGrath et al sarana 340 150 4 350 979 9 1982 Eberwein 340 861 4 553 223 Nov 12 1985 1 Patent Number 45 Date of Patent 4 356 475 10 1982 Neumann et al 340 521 4 361 877 11 1982 Dyer et al 364 900 4 365 290 12 1982 Nelms 364 200 4 369 497 1 1983 Poupon et al 364 422 4 375 663 3 1983 et al 364 200 4 388 706 6 1983 Butler
10. ammability of characteristics easy remote transmission of data and comparibility with automatic analysis and digital processing means great flexibility permitting combinations with high perfor mance peripheral modules high reliability due to the use of static components and low electric power con sumption when operating in the watching mode The present invention therefore provides a distur bance signal recorder system comprising a fixed part called the disturbance signal recorder installed at a recording point and set up so as to receive electric sig nals to be monitored and record disturbance a separate complementary part comprising recorded data process ing means and electrical connection means between the two parts the interfering signal recorder comprising connected in series means for the reception and match ing of electrical input signals analog digital conversion and multiplexing means a first or so called pretrigger ing memory for producing a delay and a second mem ory for recording disturbance the recorder also com prising means for the detection of disturbance supplied by the reception and matching means a time dating device control and management means having a central unit for checking the conversion and multiplexing means and for controlling the recording in the second memory and auxiliary signal generator circuits wherein the second memory is a semiconductor buffer memory having a predetermined capacity for a
11. d control signal issuing a power cut off signal f first power supply means for continuously supply ing power to said processing signal means said pretriggering memory means said disturbance de tector means and said programmable control means and g second power supply means for supplying power to said buffer memory means in response to said second control signal from said disturbance detec tor means and for cutting off power to said buffer 20 25 35 memory means in response to said power cut off 45 signal from said programmable control means a peripheral unit including a storage recording means for recording said disturbance signals recorded in said buffer memory means and a detachable pro gramming terminal including a control display unit for programming said programmable control means and digital interface means for linking said fixed unit and said peripheral unit wherein said programmable control means reads said disturbance signals recorded in said buffer memory means and transmits said read disturbance signals via said digital interface means to said peripheral unit for recording in said storage recording means 2 A system according to claim 1 wherein said fixed unit comprises 50 55 65 10 a monitoring area continuously energized by said first power supply means and a recording area ener gized and deenergized by said second power sup ply means in response to said second and third control
12. e or trouble in order to subsequently make it possible to obtain details of the complete history thereof There are two main types of disturbance signal re corders namely electromechanical and electronic re corders but the present invention relates to the latter type According to a first known embodiment falling in this category an electronic device producing a time lag or delay is inserted upstream of the device for writing on paper which uses optical galvanometers a halogen lamp and a photosensitive paper For this purpose elec trical input signals after undergoing analog digital con version pass through the delay device or pretriggering memory or store formed with the aid of a shift register and are then reconverted into analog signals for applica tion to the galvanometers This solution has a number of disadvantages due essentially to the writing devices used Galvanometers with halogen lamps are expensive and the fact that they are constantly supplied with power is prejudicial to their reliability In addition the need to periodically replace the roll of paper used leads to high operating costs Finally the photosensitive paper of the writing or recording device has a poor storage life both before and after use According to a second known solution certain of these disadvantages are obviated by using a conven tional writing or recording device having styli so that costs are reduced and the paper has a good life How eve
13. erably reduce the frequency with which the rolls of paper are replaced If the writing or recording device is detach able the operator can transport it with him and repro duce on the paper the recordings of the day of his or her visit The disadvantages of this latter electronic solution are mainly in the type of memory used the latter form ing an integral part of the recording chain For certain applications such as the monitoring of electric power transmission lines in tropical countries the characteris tics of the flexible disks temperature range for use 5 to 45 C permitted relative humidity 20 to 80 may prove inadequate Moreover a breakdown in the flexi ble disk memory automatically leads to a failure of the recorder which from then on is no longer able to col lect new information BRIEF SUMMARY OF THE INVENTION One object of the present invention is to provide a disturbance signal recorder system eliminating the dis advantages of the preceding solutions while offering the advantages of each of them In particular the system uses a buffer memory having a relatively large capacity which can work in combination with an economic writ ing or recording device permitting both alphanumeric entries dating and identification and graphic entries on a paper which is stable before and after use As can be gathered from the following description the system also provides specific advantages the most important being progr
14. erefore said processing is only performed in working part EPT Operation 104 results from the pro gramming of central unit 6 The result of the control calculations influences the sampling frequency given by control signal S3 The central diagram relates to the test and operations of the working part EPT Initialization in 110 is con trolled by signal S7 which releases power supply 11 Stage 111 represents the recording cause test which can result from disturbance detection to 112 or an auto test control to 121 or an operator dialogue re quest to 125 In the case of disturbance detection the corresponding signal is S6 received by central unit 6 Stage 112 is the test controlled by unit 6 of the state of memory 4 whether or not the latter is full If it is not full filling continues If it is full operation 113 consist ing of reading the oldest data stored in 4 takes place Stage 114 is the operation of orienting said data after processing by possible compression into mass memory 5 Test 115 corresponds to the end of recording in mem ory 5 i e the end of the disturbance to be recorded It is possible here to have several different operating types and for each of them a predetermined recording time as a function of the preprogrammed rules Test 116 corresponds to a programmed output to a peripheral device and stage 117 in the affirmative to the transfer operation to a magnetic memory unit UMM or external printer IP Stage 118
15. es several assemblies or modules These can be subdivided into a first part in stalled as a fixed station at a recording point and which constitutes the basic module or disturbance signal re corder EP whose function is to monitor the electric input signals and record possible disturbance in a solid state memory forming a buffer There is also a second partex which can be installed in the vicinity of recorder EP or at a distance therefrom The second part may be built in accordance with a centralized processing device for use by several interfering signal recorders EP This second part EX can be constructed in various ways and essentially comprises means for processing data re corded in module EP Processing part EX can be real ized by means of a paper printer IP or can incorporate a memory unit UM as will be shown hereinafter In FIG 1 the disturbance signal recorder system is represented by its essential components namely the actual recorder EP the processing circuits EX and a programming terminal TP The original construction of recorder EP ensures the high degree of flexibility of the system Recorder EP incorporates connection means for the reception of input signals to be monitored Connection takes place on terminals B1 to Bn able to receive up to n input signals SE1 to SEn The input terminals are connected to a group of matching circuits 1 which are connected to the channels for which matching is pro vided matching of level
16. ictionary and can be changed when the language of the operator changes For information purposes it is pointed out that the essential components of programming terminal TP are a series interface 20 central unit 21 a character generator 22 keyboard 23 and a display 24 apart from a power supply 25 which is controlled from power supply 11 which is started up by closing contact door 12 The latter can also be brought into the closed posi tion by the mechanical locking or engagement of the connection of the programming terminal The disturbance signal recorder EP can be combined with a printer IP constituting the processing circuits EX so as to reproduce on paper the elements stored in buffer 5 As shown in FIG 2 printer IP can be of any random type provided that it can operate both in the graphic mode for plotting curves and in the alphanu meric mode for entering data and other data and pro vided that it can be remotely started up i e made live by control of recorder EP Thus it is possible to use a thermal electrosensitive optical fibre cathode ray tube or laser printer which the user can choose as a function of requirements The arrangement does not suffer from the disadvantage of loss of monitoring in the case of the paper ending or the printer failing Thus memory 5 generally has an adequate capacity to be able to await the arrival of the operator while being ready to store any other possible recordings Programming terminal T
17. infor mation the power can be below 20 Watts A fourth feature of the system is the possibility of programming certain of its characteristics such as the pass band the sensitivity the duration of the record ings and the service identifications which makes it possible to use it for developing the recordings accord ing to the particular needs This results from the use of a conventional programming terminal TP constituted by a portable terminal having the size of a pocket calcu 0 5 25 40 45 55 60 65 6 lator and which can therefore be easily transported In the same recorder EP terminal TP comprises a central unit 21 whose programmes can evolve It is connected to digital interface links at 8 and makes it possible to produce all the controls and programming while per mitting a dialogue between the operator and the re corder EP as a result of the alphanumeric display on terminal TP Thus the interfering signal recorder EP can be designed with a box or case having substantially no manual controls on the front face which makes it possible to greatly cut down costs The dialogue and programming by the bias of terminal TP are made possi ble as a result of central unit 6 which in the read only memory 13 programmed for this purpose can convert the dialogue of the informatics type into dialogue which can be easily interpreted by a not specially trained oper ator The ROM 13 is the equivalent of a d
18. l 1979 FIG 6 shows a flow chart of a disturbance signal recording system according to the invention The verti cal left hand diagram relates to the testing and opera tions of the watching part EPV Stage 100 corresponds to the initialization of part EPV i e to it being made live Test stage 101 represents the wait from sampling control S3 processed by the central unit or a micro processor 6 This is followed by the cyclic scrutiniza tion or scanning operation 102 i e the sampling of sig 20 25 30 35 40 45 50 55 60 65 8 nals by multiplexer at 2 on periodic control by signal S3 The following operation 103 is the orientation of the digital result S1 of the scrutinization into the pretrigger ing memory 4 The digital data are entered in memory 4 in place of the oldest data previously there The oldest data are then either eliminated or transmitted to the buffer memory 5 as will be shown hereinafter during the analysis of the diagram EPT Stage 104 corresponds to control calculations performed by the central unit for making the sampling frequency dependent on the fluc tuations of the signal frequency to be checked in such a way that substantially the same samples of the consid ered signal are selected during the successive cycles thereof This operation makes it possible to prepare the sampled signals for subsequent processing by compres sion reserved for the signals resulting from interference and th
19. n prior to the disturbance for a given time which is essentially equivalent to the said delay e g of approximately a few tenths of a sec ond Memory 4 is connected by its output 52 to a sec ond memory 5 for recording disturbance A circuit 6 processes the control and synchronization signals S3 relative to conversion and multiplexing cir cuits 2 By link S4 it controls the recording of disturb ances and to this end one output S5 of circuit 3 is trans mitted to circuit 6 across a time dating device 7 The time dating device 7 serves to supply a very precise dating e g to within one thousandth of a second for each disturbance signal or the like This information as well as the date is transmitted by link S6 to circuit 6 to be recorded in the second memory 5 at the head of each recording in the form of an identifier containing in digital form all the information for the subsequent pro cessing of the data namely the characteristics of the position and apparatus where the recording was carried out together with the date and duration thereof Time dating device 7 uses circuits having a low elec trical power consumption e g of C MOS technology An accumulator 10A permanently charged by power supply 10 is used as an emergency supply for time dat ing device 7 via link S10 in the case of a temporary interruption of the general power supply 10 Link S11 connects the time dating device to the outside to enable it to receive or transmit synch
20. pass band etc The signals leaving unit 1 are transmitted on the one hand to analog digital conversion and multiplexing circuits 2 and on the other to disturbance signal detec tion circuits 3 The conversion into digital form of the signals re ceived in analog form can be carried out before or after multiplexing In the latter case it is merely necessary to have a single conversion circuit but the reliability of the system is better with the first option Obviously the system can also receive signals in digital form which are directly transmitted to the multiplexing circuits 2 as 20 25 30 35 40 45 50 55 65 4 well as to the detection circuits 3 The digital signals are received at terminals B 1 to B m In the case of analog signals the detection circuits 3 operate by threshold comparisons filtering or other procedures for the purpose of detecting specific disturb ances which can be in the form of an amplitude varia tion a frequency variation or a variation of some other characteristic parameter of the corresponding input signal In the case of digital signals the detection of interference is based on the detection of the changed state of one or more inputs The multiplexing output 1 is transmitted to a pre triggering memory 4 of the shift register type to intro duce a given delay which makes it possible during the detection of interference by circuit 3 to record in a downstream circuit the positio
21. r the stylus recorder has a reduced pass band of approximately 30 Hz at the most and for reproducing signals with a higher frequency a device is provided for slowing down the signals to make them compatible with the stylus recorder This device is constituted by a solid state electronic memory which is inserted between the shift register i e the pretriggering memory and digital analog reconversion circuits A disadvantage of the stylus recording device is the difficulty of reproducing in a simple manner and at the same time as the input signals the date information necessary for processing the recordings In addition these two solutions have two important deficiencies The first is the need of systematically re placing the roll of paper and the second is the lack of flexibility of the information support a diagram on paper not really being suitable for automatic analysis and digital processing without the use of a human oper ator A third solution obviating the aforementioned diffi culties is described in French Patent Application 2 429 998 The useful input signals are recorded on a flexible disk magnetic memory inserted between the shift register constituting the so called pretriggering 0 5 45 60 65 2 memory and the digital analog conversion circuits ceding a recorder on paper The capacity of the disk memory is equivalent to several rolls of paper Thus the size of this memory makes it possible to consid
22. ronizing signals The latter can come from an external clock HX FIG 3 or some other recorder EP FIG 5 and can be passed to one of several other recorders EP Circuit 6 comprises a central unit and associated cir cuits 2 for forming a microprocessor or microcomputer Therefore it is also provided with variable input and program memories constant data memories and bus links with the input output circuits Its structure is of a conventional nature and reference can be made in this connection e g to the document published by the MO TOROLA company entitled 6800 Microcomputer System Design Data Central unit 6 controls the writing into memory 5 and subsequently the reading of the memory for transmit ting the data to the processing means across interface circuits 8 Thus a first feature of the system results from the fact that the external links of recorder EP take place by digital interface circuits There is no digital analog re conversion at the output of the second memory The connection between recorder EP and processing means EX can be in the form of a standard digital link e g of the RS232 type This arrangement which renders su perfluous a demultiplexing operation and a digital analog reconversion operation also has the advantage 4 553 223 5 of scratching the output signals thus making it possi ble to connect numerous ancillary devices particularly of the informatics type to the recorder EP The dist
23. ry to combine with recorder EP a supplementary interface component adapted to the remote connection mode telephone lines high voltage lines optical fibres radio links etc whereby this component can be e g a modulator demodulator in the case of a telephone link Units UMM can be of the flexible disk or magnetic tape type said two supports being detachable or it is also possible to use memory units of the fixed disk magnetic bubble or other types In each of these cases the opera tor can program recorder EP in such a way that when the memory support is full in magnetic memory unit UMM it erases the oldest recordings and replaces them by more recent recordings In the arrangements of FIGS 4 or 5 which use a magnetic memory unit UMM a printer IP is indicated by dotted lines and it is possible to reproduce on the latter the recording when this is desired by the operator Printer IP can be carried to the location by the operator at the same time as terminal TP By means of the central unit 6 of recorder EP or one of them case of FIG 5 the operator transfers data from the magnetic memory unit UMM to printer IP In the described arrangements incorporating one or more recorders EP it should be noted that decisions are centralized by the recorder and not by the associated peripheral equipment As by defi nition disturbance is of a random nature it can intervene during a dialogue or a data transmission The central unit 6 is programmed
24. s of the working part Following a corresponding recording through the buffer memory 5 the central unit via link 8 controls the stopping of the power supply of the working part by circuit 11 However a manual control 12 makes it possi ble for the working part EPT to be made live by the operator during the use of the programming terminal TP Working part EPT incorporates the second or buffer memory 5 auxiliary circuits 9 interface circuits 8 as well as a programmed read only memory 13 which is used by the bias of the central unit 6 during dialogue with recorder EP by means of programming terminal TP It should also be noted that central unit 6 can form part of the working part EPT by means of the use of a second central unit in the watching part ensur ing the control links S3 to the conversion and multiplex ing circuits 2 and S9 to the detector circuits 3 Link S9 makes it possible for central unit 6 to interrogate circuit 3 in order to obtain information on the origin of the triggering process and can then place this information in the identifier at the head of the recording When a second central unit or a small microprocessor is used said second unit is obviously connected to the central unit located in the working part As a result of the subdivision of recorder EP into two separate and entirely static parts whereof only the watching part is constantly live the average absorbed part is greatly reduced and reliability is high For
25. signals respectively said monitoring area including said processing signal means which includes analog digital conversion and multiplexing circuits for feeding said digital signals to said disturbance detection means and to said pretriggering memory means said disturbance detection means said pretriggering memory means said programmable control means a time dating device connected between said disturbance detection means and said programmable control means for supplying a precise dating to each of said disturbance signals detected by said disturbance detection means and said first power supply said recording area including said buffer memory said digital interface means and said second power supply 3 A system according to claim 2 wherein said re cording area also comprises a read only memory for operating in conjunction with said programming termi nal via said programmable control means 4 A system according to claim 3 wherein the pro grammable control means comprises a first processor in said monitoring area which is continuously energized to control and synchronize the analog digital conver sion and multiplexing circuits as well as the disturbance detection means and the time dating device and a sec ond processor in said recording area for controlling said buffer memory means and said read only memory said second processor being controlled by said first proces sor 5 A system according to any one of claims 3 4
26. urbance signal recorder EP also comprises in per se known manner so called auxiliary circuits 9 for processing service signals indicating e g by the closing of a relay contact that recording is taking place or for controlling the making live of the ancillary equipment for receiving the data These service signals are trans mitted to the outside in digital form across interface circuits 8 A second feature of the recorder is that solid state memory 5 is a static memory instead of being dynomic such as a disk or tape memory Semiconductor memory 5 has an average capacity which can be e g about 10 seconds of recording In fact it forms a buffer memory between the recorder and the external analysis and processing means EX According to a third feature of the system recorder EP is subdivided into two parts namely a constantly supplied watching part EPV and a working part EPT which only receives power in the recording mode In actual fact part of EPT is also supplied when recorder EP is used with programming terminal TP in the man ner described hereinafter This is brought about by means of separate supplies for each of the parts power supply 10 relating to the watching part and rendering live the circuits involved in this part as soon as the recorder is started up The second power supply 11 relating to the working part EPT is only triggered by output S7 of detector 3 during the detection of interfer ence in order to render live the circuit
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