Process and system for gathering and evaluating measured data

• US 5,237,325 A
• Filed: 05/21/1992
• Issued: 08/17/1993
• Est. Priority Date: 11/21/1989
• Status: Expired due to Fees

• Current Assignee: Hans-Christoph Klein, Ludger Munch, Peter Lohberg
• Original Assignee: Hans-Christoph Klein, Ludger Munch, Peter Lohberg
• Inventors: Klein, Hans-Christoph, Munch, Ludger, Lohberg, Peter
• Primary Examiner(s): Williams, Howard L.
• Application Number:
  US07/859,351
• Time in Patent Office: 453 Days
• Field of Search: 341/141, 341/155, 341/122, 341/123, 364/550
• US Class Current: 341/155
• CPC Class Codes: G01D 9/005 Solid-state data loggers
• CPC Class Codes: G01P 3/489 Digital circuits therefor

Abstract

A process and a system for multi-channel gathering and evaluation of measured data in which measured data channels are distinguished into analog data channels and into digital or event channels. By means of a signal derived from the events, or rather from event signals, and processed in the event channels the analog measured data are synchronously sampled, (i.e. picked up, converted into a digital value and stored). Each time an identification number is stored for the event signal triggering the sampling operation, or rather of the corresponding event channel, the phase time between this sampling signal and the preceding sampling signal, the associated sampled measured data and the time sequence of the sampling operations. The signal triggering the synchronous sampling operation is preferably formed by OR-linking of all event signals which are scaled down, if applicable.

Claims

1. A method for gathering and making available for evaluation measured data comprising the steps of:

supplying, from a plurality of parallel and independent analog data channels and a plurality of event channels, analog data signals and event data signals representative of measured data, said event data signals having identification numbers corresponding to the event channels with which said event data signals are associated;

generating successive sampling signals in response to event data signals from at least one event channel;

sampling analog data signals from the analog data channels synchronously in response to each sampling signal and converting sampled analog data signals into digital data signals representing digital measured data;

measuring a time interval between successive sampling signals;

determining the identification number for the event channel providing the event data signal which causes generation of the sampling signal; and

storing the time interval, the digital measured data, and the respective identification number, for each sampling operation and making availalable for evaluation the stored digital measured data.

2. A method as set forth in claim 1, wherein the step of generating successive sampling signals comprises the steps of:

assigning each event channel to one of first and second groups;

generating a sampling signal in response to each event data signal received from an event channel in said first group;

counting the number of event data signals received from each individual event channel in said second group; and

generating a sampling signal for each individual event channel in said second group when a predetermined number of event data signals are received from said channel.

3. A system for gathering and making available for evaluation measured data comprising:

means, including a plurality of parallel and independent analog data channels and a plurality of event channels, for supplying analog data signals and event data signals representative of measured data, said event data signals having identification numbers corresponding to the event channels with which said event data signals are associated;

means for generating successive sampling signals in response to event data signals from at least one event channel;

means for sampling analog data signals from the analog data channels synchronously in response to each sampling signal and for converting sampled analog data signals into digital data signals representing digital measured data;

means for measuring a time interval between successive sampling signals;

means for determining the identification number for the event channel providing the event data signal which causes generation of the sampling signal; and

means for storing the time interval, the digital measured data, and the respective identification number, for each sampling operation and for making availalable for evaluation the stored digital measured data.

4. A system as set forth in claim 3, wherein said sampling signals generating means include means for generating a clock signal which is coupled to one of the plurality of event channels.

5. A system in accordance with claim 3, wherein said sampling signal generating means include:

means for counting the event data signals from each individual event channel; and

means for generating a sampling signal for each individual event channel when a predetermined number of event data signals have been counted for that event channel.

6. A system as set forth in claim 3, wherein said sampling signals generating means include:

means for assigning each event channel to one of first and second groups;

means for generating a sampling signal in response to each event data signal received from an event channel in said first group;

means for counting the number of event data signals received from each event channel in said second group; and

means for generating a sampling signal for each event channel in said second group when a predetermined number of event data signals are received from said channel.

7. A system in accordance with claim 3 wherein said time interval measuring means include:

means for supplying clock signals;

means for counting said clock signals;

means responsive to said sampling signals for conducting to said storing means the count of said clock signals each time a sampling signal is generated and for resetting said counting means each time a sampling signal is generated.

8. A system for gathering and making available for evaluation measured data comprising:

means, including a plurality of parallel and independent channels, for supplying analog data signals and event data signals, said event data signals having identification numbers corresponding to the channels with which said data signals are associated;

means for allocating each independent channel as one of event and analog data channels, corresponding to the data supplied by said channels;

means for generating successive sampling signals in response to event data signals from at least one independent channel allocated as an event channel;

means for sampling analog data signals from the independent channels allocated as analog data channels synchronously in response to each sampling signal and for converting sampled analog data signals into digital data signals representing digital measured data;

means for measuring a time interval between successive sampling signals;

means for determining the identification number for the independent channel providing the event data signal which causes generation of the sampling signal; and

means for storing the time interval, the digital measured data, and the respective identification number, for each sampling operation and for making availalable for evaluation the stored digital measured data.

9. A system in accordance with claim 8 further comprising:

means for supplying direction signals representative of a direction of change for the analog measured data; and

means for supplying reference signals representative of reference values for said analog measured data, and

wherein said storing means store and make availalable for evaluation said direction and reference values.

10. A process for multi-channel gathering and evaluation of measured data where analog measured data are picked up in parallel measured data channels, are converted into digital measured data and are stored in a memory for on-line or off-line evaluation, with the analog measured data in the parallel measured data channels being synchronously sampled by a digital sequence of signals or sequence of events, characterized in that the measured data channels are distinguished or divided into analog data channels and in digital or so-called event channels, in that the synchronous sampling, i.e. picking-up, processing and storing of the measured data obtained in the analog measured data channels is controlled by way of the signal (4, 4'"'"') derived from the events and processed in the event channels, in that the phase time (t_nm) between two subsequent sampling signals is measured, and in that each time there are stored an identification number of the event signal triggering the sampling operation, or rather of the corresponding event channel, the phase time (t_nm) between this sampling signal and the preceding one, and the appertaining sampled values or sampled measured data (A(nm)).

11. A process as claimed in claim 10, characterized in that the sampling signal (4, 4'"'"') is formed by OR-linking of event signals and/or of event signals scaled down.

12. A system for implementing the gathering and evaluation of measured data, with measured data channels which are operated in parallel and which are independent of one another, namely with analog data channels, provided with individual analog-to-digital converters or with multiplexers having one common analog-to-digital converter at a time and with memories;

with digital measured data channels or with so-called event channels;

as well as with circuits for controlling the sampling operation and the gathering of the measured data, characterized in that the pick-up, the processing or further handling and the storage of the measured values present in the individual analog data channels is synchronously controllable by means of a sampling signal (4, 4'"'"') derived from the event signals;

in that the sampling signal further is feedable to a channel decoder (8, 8'"'"') identifying the event channel of the event triggering the sampling signal as well as to a phase time measuring unit (9, 9'"'"') detecting the time duration (t_nm) between two subsequent sampling signals (4, 4'"'"'); and

in that each time a sampling signal (4, 4'"'"') comes up there can be stored the identification number such as the number of the triggering event channel and the phase time (t_nm) between this sampling signal and the preceding one as well as the appertaining sampled values.

13. A system in accordance with claim 12, characterized in that there is provided an event channel which a time base (14, 15) is connected to.

14. A system in accordance with claim 12, characterized in that the event channels have individual signal processing stages (5, 25, 26) followed by event rate scaling-down units (6, 27, 28).

15. A system in accordance with claim 12, characterized in that the sampling signal is formed by OR-linking (OR-stage 7, 7'"'"') of all event signals that have been processed or, if applicable, scaled down.

16. A system in accordance with claim 12 characterized in that the phase time measuring unit (9, 9'"'"') contains a central counter which is reset and restarted by any event signal that has been processed and, if applicable, scaled down, each time the counter contents being transferable as phase time into the memory (11, 11'"'"').

17. A system in accordance with claim 12, characterized in that the same is equipped with input stages (16, 17) of the same kind which comprise an input amplifier or preamplifier (21, 22) and a change-over device (19, 20) each and whose input signals are evaluatable as analog data and/or as event signals, depending on the operating position of the change-over device (19, 20).

18. A system as claimed in claim 17 characterized in that additional signals (inputs R1, R2), indicating the direction or the sign of a change, and marking signals (inputs M₁, M₂)--such as for zero marking--are feedable to and evaluatable in the input stages (16, 17).