JPH07120501A - Waveform recorder - Google Patents

Abstract

PURPOSE:To continuously record waveform data of a channel input signal for a long time and print out abnormal and fluctuating portions of waveforms in real time. CONSTITUTION:A waveform recorder comprises a first memory controller 2 for extracting waveform data sampled from a channel input signal at a slower clock timing to alternatively acquire a predetermined number of data into one of two memories 2a, 2b and into the other, a first external recorder MTU 7a for sequentially recording the waveform data fetched into the two memories 2a, 3b by a first CPU 4, a second memory controller 3 for comparing the waveform data of the input signal with given trigger conditions to extract the waveform data which has conformed to the conditions and fetch it into another memory 3a, a second external recorder MTU 10 for recording the waveform data in another memory 3a by a second CPU 9 and a printer to convert the recording data of the MTU 10 into an analog waveform diagram for outputting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform recording device,
More specifically, the present invention relates to a waveform recording apparatus for continuously recording the waveform of an input signal for a long period of time, and providing an abnormal variation portion of the signal waveform with a printer or the like for analysis.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional general waveform recording apparatus for recording an input signal waveform of 4 channels, for example. The analog input signal of each channel is sampled, for example, in the input amplifier 1 and the level thereof is converted into digital data. The CPU 4 commands the memory controller 2 to start the operation and causes the waveform data of each channel to be taken into a predetermined area of the memory 2a.

When these waveform data enter, for example, the final address of each area, the CPU 4 temporarily stops the data fetching operation of the memory controller 2, reads the data in the memory 2a, and transfers it to the FDD (external recording device) 7. And record. As a result, the waveform data of each channel is held in the FDD 7.

When the recording on the FDD 7 is finished, the CPU 4 restarts the operation of the memory controller 2 and loads the waveform data into the memory 2a. When the waveform data reaches the final address of the memory 2a, the CPU 4 stops the operation of the memory controller 2, reads the data stored in the memory 2a, and transcribes the data to the FDD 7, and so on until the recorded data reaches a predetermined amount. repeat. When the recording data to the FDD 7 reaches a predetermined amount, the CPU 4 causes the memory controller 2
Then, the data stored in the memory 2a is cleared.

Generally, the following procedure is used to analyze a waveform. That is, the CPU 4 first puts the memory controller 2 into an operation stop state, reads the waveform data of, for example, a desired channel from the FDD 7, and loads it from the head address to the last address of the channel area of the memory 2a.
Next, the CPU 4 reads the loaded waveform data and gives it to the display 5, for example, and the operator of the apparatus visually observes the waveform image displayed by the display 5.

In this case, if a portion requiring analysis is found, the waveform data of the portion is given to the printer 6, and an enlarged waveform diagram or the like is printed out. Below, CPU4
Then, the next waveform data is read from the FDD 7 and loaded into the memory 2a, and the loaded data is given to the display 5 to update the displayed waveform and the search for the portion requiring analysis is repeated. The operation mode of each unit, such as loading the waveform data into the memory 2a via the memory controller 2, transferring the waveform data to the FDD 7 by the CPU 4, and loading the recorded data of the FDD 7 into the memory 2a, for example, by operating the keyboard 8 It is supposed to do.

[0007]

As described above, this conventional apparatus employs a general method for locating a portion requiring analysis while visually observing the waveform displayed on the display 5. In this case, since the waveform data recorded in the FDD 7 is loaded into the memory 2a and then applied to the display 5, the memory controller 2 causes the memory 2a to operate.
Since the operation of taking in data to is temporarily stopped, the waveform data of the input signal during that time is lost, and the recording data of the FDD 7 becomes discontinuous. Therefore, if the waveform data of the portion that needs to be analyzed happens to be not recorded in the FDD 7, there is a problem that the portion is missed in the search.

The present invention has been made in view of the above circumstances, and an object thereof is to record waveform data of a channel input signal continuously in an external recording device for a long time while determining a portion requiring waveform analysis. It is to provide a waveform recording device that automatically searches and outputs the waveform data to a printer or the like.

[0009]

In order to solve the above problems, the present invention includes the following means. That is, the first CPU, the operation of which is controlled by the same CPU, the first memory controller which alternately takes in a predetermined number of waveform data of an input signal into two memories, and the waveform data of the memory is sequentially recorded. A first external recording device for holding the same.

A second CPU and its operation are controlled by the CPU, the waveform data of the input signal is compared with a given trigger condition, and the waveform data matching the condition is extracted and loaded into a memory. And a second external recording device for recording and holding the waveform data of the memory.

[0011]

In the above means, for example, the first memory controller fetches a predetermined number of waveform data into one of the memories and then fetches the predetermined number of waveform data into the other memory. During the period in which the waveform data is captured in the other memory, when the waveform data of the period immediately before that captured in one memory is sequentially transferred to the first external recording device by the first CPU, The external recording device holds continuous waveform data of an input signal.

Further, in the above-mentioned means, abnormal fluctuation data, etc., which require analysis in the waveform data of the input signal,
If there is data that meets the given trigger conditions, they will be automatically extracted and loaded into memory by the second memory controller. This waveform data is the second CP
When the data is transferred to the second external recording device at U and given to the display or printer, the waveform data of the input signal can be continuously collected by the above means while performing the waveform analysis without interruption. You can

[0013]

FIG. 1 is a block diagram of a waveform recording apparatus according to an embodiment of the present invention.
Shown in. The input signals of channels 1 to 4 are respectively sampled in the input amplifying section 1, and the digitally converted waveform data thereof are added to, for example, the first memory controller 2 and the second memory controller 3. Here, the operation of each unit will be described with reference to FIG. 2 in combination with the case where the input signal of channel 1 is, for example, a triangular waveform.

FIG. 2 (A) shows the input signal waveform of the above-mentioned channel 1, and its sampling data (waveform data) is shown in FIG. 2 (B). The input amplifying section 1 uses a relatively high-speed sampling clock as in the conventional device, and can sufficiently capture even if the input signal has a pulse-like level fluctuation.

The sampling data shown in FIG. 2B is applied to the first memory controller 2 and the second memory controller 3, for example. The first memory controller 2
Is a data acquisition operation under the control of the CPU 4,
The sampling clock of the input amplifier 1 is divided into, for example, 1 / n, and the low-speed sampling clock is used.
The waveform data of 1 is taken into the channel 1 area of one memory 2a. An example thereof is shown in FIG. That is, the waveform data sent from the input amplifier 1 is stored in the memory 2a at a rate of 1 in n.

When a predetermined number of data fetched in the channel 1 area of the memory 2a, for example, reaches the final address of the area, the memory controller 2 switches the data input path to the channel 1 area of the other memory 2b, and Similarly, data acquisition is continued. An example of this is shown in FIG.

While the memory controller 2 is fetching data into either the memory 2a or the memory 2b, the CPU 4 reads the data fetched in the immediately preceding period from the other memory, and the external recording device (eg magnetic tape). (Device) Transfer to MTU7a. Figure 2
It shows in (E). By repeating the operations of FIGS. 2C, 2D, and 2E, the waveform data of the input signal is continuously recorded in the MTU 7a.

When the sampling data shown in FIG. 2 (B) is added from the input amplifier 1, the second memory controller 3 automatically extracts the waveform data that matches the trigger condition given in advance, and the memory 3a. It is designed to be imported into. For example, if pulsed external noise enters the input signal at the points A and B in FIG. 2A, the memory controller 3 uses the sampling data in FIG.
(F)) is extracted and loaded into the memory 3a.

The CPU 9 first transfers the data (i) taken into the memory 3a to, for example, the second external recording device MTU10. An example thereof is shown in FIG. The CPU 9 loads the transcribed data into the memory 3a, and then the printer 6
2H, a detailed fluctuation waveform diagram shown in FIG. 2H, for example, is output from the printer 6. The waveform diagram is similarly set out at the place of (b).

Here, the first external recording device MTU7
The continuous waveform data recorded in a is used for monitoring the channel input signal. For example, when setting a new trigger condition, the waveform data of the MTU 7a is given to the display 5 to reproduce the analog waveform. The operator of the device sets the trigger condition for the portion requiring the waveform analysis while looking at it. In this case, it is not necessary to capture detailed waveform data in the MTU 7a because it is only necessary to visually confirm the place where the trigger condition is set for the monitor waveform. Therefore, in this embodiment, as described above, the waveform data is captured by a low-speed clock obtained by dividing the sampling clock of the input amplifier 1 into 1 / n.

In the second memory controller 3, for example, the size of the sampling data applied from the input amplifier 1 is compared with a preset comparison reference value,
It is provided with a digital comparator (not shown) that issues a trigger signal when it exceeds or falls below the same reference value, a counter that counts the number of sampling data added before and after the time when the trigger signal is issued, and the like. When the operator of the apparatus sets, for example, a desired comparison reference value, the total number of data to be fetched, and the number of data before and after the trigger signal is generated by the keyboard 8 as the trigger condition, the sampling data conforming to the trigger condition is stored in the memory 3a as described above. Is automatically taken into.

The comparison reference value is set, for example, by binary data having the same number of bits as the sampling data of the input signal. It is also possible to set comparison reference values of two levels, high and low, and to take in sampling data that falls between both reference values or sampling data that exists outside both reference values.

[0023]

As described above in detail, according to the present invention, while the waveform data of the channel input signal is continuously recorded in the first external recording device, the input signal level changes abnormally without interruption. It is possible to automatically capture the waveform data of a portion requiring analysis, record the waveform data in the second external recording device, and simultaneously output the detailed waveform image from a printer or the like. Therefore, since there is no omission in the continuous waveform data, it is possible to provide a highly reliable and convenient waveform recording device.

Since the sampling clock for continuously capturing the waveform data of the input signal is set at a relatively low speed so that the abnormal variation portion can be visually recognized when the analog waveform is displayed, the sampling clock for the external recording device is It is also suitable for long-term recording.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a waveform recording device to which the invention is applied.

FIG. 2 is an explanatory diagram of a data processing operation in each unit of the waveform recording device to which the present invention is applied.

FIG. 3 is a block diagram showing an electrical configuration of a conventional device.

[Explanation of symbols]

 1 Input Amplifier 2 Memory Controller 2a Memory 2b Memory 3 Memory Controller 3a Memory 4 CPU 6 Printer 7a External Recording Device 9 CPU 10 External Recording Device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G01D 9/00 A 6947-2F G06F 3/12 A

Claims (1)

[Claims] 1. Waveform data sampled from a channel input signal is recorded in a memory and then transferred and held in an external recording device, and desired data is extracted from the waveform data of the input signal and added to a printer. In a waveform recording device that provides a waveform diagram output from the printer for waveform analysis of the input signal, a predetermined number of waveform data sampled from the input signal are output at a clock timing lower than the sampling clock of the waveform data. A first memory controller that alternately takes in at least one of the two memories and the other memory, and controls the data taking operation of the first memory controller, and the first memory controller causes the first memory controller to take a predetermined number of times into one of the memories. During the period when the waveform data of Et first CP reading the waveform data acquired during the period just before
U, a first external recording device for sequentially recording the waveform data of the one and the other memories read by the first CPU, and holding the waveform data as continuous waveform data of the input signal; and A second memory controller that receives waveform data sampled from an input signal, compares the waveform data with preset trigger conditions, extracts waveform data matching the trigger conditions, and loads the waveform data into another memory different from the above two memories; A second CPU that controls the data fetching operation of the second memory controller, reads the waveform data fetched in the other memory, and records the waveform data read by the second CPU. The second external recording device that holds the waveform data held by the second external recording device via the second CPU, Waveform recorder, wherein a and a printer that enables output analog waveform in real time is provided in the trigger condition fit portion in the input signal.