JPH01161160A - Oscilloscope operation supporting device - Google Patents

Abstract

PURPOSE:To enable data memory operation and to obtain an inexpensive device by providing a RAM, an A/D converter, a D/A converter, etc. CONSTITUTION:The switching of the contact of a changeover switch 21 is controlled by a microcomputer(MPU) 60 and a signal from a probe or the D/A converter 30 is inputted to a C terminal connected to the CH 1 input of an oscilloscope 10. Further, a probe 16 is also connected to the A/D converter 20 and a signal changeover switch 22 similarly to the circuit of the probe 15, and the output terminal of the D/A converter 50 is connected to the on contact point of the switch 22. This switch 22 has its contact switching controlled by the MPU 60. Further, the MPU 60 sends out a digital signal to the converters 30 and 40 through a data bus. Then the MPU 60 is connected to an operator guide display device 2, a reset switch 3, a set switch 4, and an OK switch 5 and also connected to a ROM 62 and a RAM 64 as well to control various control operations.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an oscilloscope operation support device used, for example, in the maintenance and inspection of automobile equipment, and particularly for storing measurement data and controlling the oscilloscope when necessary. This invention relates to an oscilloscope operation support device that can re-display using a screen.

[Prior art]

Modern automobiles are increasingly equipped with control devices using microcomputers and various electronic devices, and for this reason, oscilloscopes have become indispensable shoulder equipment for maintenance and inspection of automobile equipment.

If an oscilloscope can be used freely, it can become a powerful general-purpose inspection device, but in automobiles, there are times when it is necessary to save data on malfunctions that occur from time to time, and the symptoms of malfunctions, and to reproduce them for the customer. is desired.

[Problem that the invention seeks to solve]

Some oscilloscopes have a memory function,
Alternatively, there are data memoryizers, but these are very expensive, complicated to operate, and have drawbacks such as lack of power backup.

The purpose of the present invention is to eliminate such drawbacks of the prior art,
An object of the present invention is to provide an oscilloscope operation support device that is capable of data memory and is inexpensive.

[Means for solving problems]

To achieve the above object, the present invention provides a control means such as a microcomputer (MPU) for data processing, a data storage memory such as a random access memory (RAM), and a vertical axis (voltage) of an oscilloscope. A display means such as a CRT display that displays operation information such as axis) knob setting values and horizontal axis (time axis) knob settings, an analog/digital converter (A/D converter), and a digital/analog converter. It is equipped with a converter (D/A converter) and is connected to an oscilloscope.

Then, a measurement signal from a device to be measured, such as an automobile device, is repeatedly taken in for a predetermined period of time, and after the data is processed by the control means, it is stored in the storage memory.

Furthermore, when necessary, the stored data (eg, waveforms, etc.) can be reproduced using the tube surface of the oscilloscope.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a front view of an oscilloscope and its operation support device, Fig. 2 is a schematic configuration diagram of the oscilloscope operation support device according to the embodiment, and Fig. 3 is a flowchart for explaining the control operation of the oscilloscope operation support device. 1 to 4 and 5 are diagrams showing display examples of the oscilloscope operation support device.

First, the schematic configuration of an oscilloscope and its operation support device will be explained using FIGS. 1 and 2.

In these figures, reference numeral 1 denotes an oscilloscope operation support device according to an embodiment, which is used in combination with an oscilloscope 10. 2 is an operator guide display consisting of a CRT display, a liquid crystal display element, etc., and displays operating guide information in text, 3 to 6 are switch groups, 3 is a reset switch, and 4 is a cellar 1- to display a number etc. to test 1. Sera 1-
The switch 5 is an OK switch for outputting a response signal in response to the instruction on the display 2, and the numeral 6 is a power switch.

Reference numeral 8 denotes a signal branch line for branching measurement signals from the signal search probes 15 and 16 to the operation support device 1 as well.

10 is an oscilloscope commonly used for maintenance and inspection of automobile equipment, 11 is a tube surface, 12 is a horizontal axis setting knob for setting the time value of the signal displayed on the tube surface, and 3 and 14 are two channel controls. Vertical axis setting knob for setting the voltage value of the screen waveform that can be displayed; 15 and 16 are signal search probes that introduce measurement signals from automobile equipment; 18 is an external (EXT) - trigger signal input terminal Then, a trigger signal from the oscilloscope operation support device 1 is input to the oscilloscope 10.

Next, the configuration of the oscilloscope operation support device 1 will be explained. As shown in FIG. 2, the CHI probe 15 is
It is connected to the NC contact of the A/D converter 20 and the signal changeover switch 21. Further, the output end of the D/A converter 30 is connected to the No contact of the signal changeover switch 21. This signal changeover switch 21 is connected to a microcomputer (MPt).
J) Switching of the contacts is controlled by 60, so that either the signal from the CHI probe 15 or the signal from the D/A converter 30 can be input to the C terminal connected to the CH] input of the oscilloscope IO. It has become.

The probe 16 for CH2 is also the probe 15 for CHI mentioned above.
Similarly to the circuit shown in FIG. 2, the circuit is connected to an A/D converter 20 and a signal changeover switch 22, and the output terminal of the D/A converter 40 is connected to the No contact of the signal changeover switch 22. This signal changeover switch 22 is.

Switching of contacts is controlled by the MPU 60.

The MPU 60 connects to the D/A converter 3 via the data bus.
A digital signal is sent out at 0.40. Also, MPU60
is connected to the above-mentioned operation switch 11 to display 2) reset switch 3, set I-switch 4, and OK switch 5, and is also connected to ROM 62) RAM 64 to handle various control operations.

Next, the control operation of this oscilloscope support device will be explained using FIG. 3.

First, in step (hereinafter abbreviated as S) 1, an instruction is given to select the data channel to be captured: CH1, CH2, or both CI(1 and C+-(2).
Next, in step 82, data acquisition time is set and instructed. FIG. 4 is a diagram showing an example of selecting the data acquisition time displayed on the display 2. In FIG. In this example, the data acquisition time is 1 to 1.
There are five types, 0 msec, 2-0.1 seconds, 3-1 seconds, 4-10 seconds, and 5-100 seconds, and any one of them can be selected using the set switch 4. Each time this set switch 4 is pressed once or twice, the
As shown in the figure, the display of ``rSE'rNα'' is programmed to change sequentially from 1 to 5, and the operator selects one of rSE'rNα from the display in Figure 4.
Select J to set and register the data acquisition time, then press OK switch 5. In S3,
A determination is made as to whether or not the OK switch 5 has been pressed.

Next, in 84, the input light of the A/D converter 20 is set to the channel selected in 81, and in S5, the input light of the A/D converter 20 is set to the channel selected in 81.
The acquisition of data (measurement signals) into the P U 60 is started, and data from the automobile equipment is stored at a predetermined address in the RAM 64 in S6.

In S7, it is determined whether or not the reading set time has come, and steps 84 to S7 are repeated until the set time is reached, and R
The data imported into AM64 each time is scanned in order.
a.

When the data acquisition time has been reached, in S8 the RA,
Find the maximum value from all the data stored in the M64, and from this maximum value select the maximum vertical axis (voltage axis) setting knob value that does not protrude onto the tube surface 11 of the oscilloscope 10.
It is displayed on the display 2 together with other instruction contents, and the operator is instructed to display it on the oscilloscope 10 (S9
).

FIG. 5 is a diagram showing an example of this operation instruction.

As shown in the figure, the trigger is an external (EXT) l-trigger, and the setting value of the horizontal axis (time axis) setting knob 12, the setting value of the vertical axis (voltage axis) setting knob 13, and the redisplay waveform. The horizontal axis reading data is displayed and provided to the operator. When using an external (EXT) I-trigger, if the differential coefficient of the initial value of the stored data is not sharp, it is possible to display the oscilloscope from the initial value, which cannot be done with a normal trigger.

When the operator presses the OK switch 5, the SlO outputs a single trigger signal to the EXT trigger input terminal 18, and the RAM 64
The data stored in is converted to the scale of the voltage axis setting knob value obtained in step 88 and outputted to the D/A converter 30. In this case, the flash selector switch 21 is connected to the C terminal and the NO
The contacts are controlled to conduct.

Next, in S12, the total number of data stored in R and AM64 is determined, and the output of S ], ] is repeated until all data are completed.
These processes are performed until the reset switch is pressed.

During Sll processing, the data output from the operation support device 1 continues to be displayed on the screen of the oscilloscope 10, and the voltage 111
11 (vertical axis) and the time axis (horizontal 1i111) can be confirmed by the operator guide display 2.

In this case, the maximum setting time is 100 seconds, and the time for redisplaying this on the oscilloscope 10 is about several tens of milliseconds, so this is particularly effective for redisplaying for a long time that cannot be observed well with the oscilloscope 10 or the like.

FIG. 6 is a flowchart for explaining the control operation according to another embodiment of the present invention. In this embodiment, a function is added to shift the waveform displayed on the tube surface 11 of the oscilloscope 10 to the left or right. ing.

In this flowchart, the contents from S21 to S30 are exactly the same as from S1 to 810 explained in FIG. 3, so the explanation thereof will be omitted.

In S31, it is determined whether either the switch 1-switch 4 or the OK switch 5 is pressed, and if the set switch 4 is pressed, the OK switch 5 is pressed in S32.
If has been pressed, the process advances to S33. That is, by instructing the operator to shift the displayed waveform of the redisplayed screen H to the left by pressing the set switch 4 and to the right by pressing the OK switch 5, the operator can shift the displayed waveform to the left by pressing the set switch 4. By operating either of these, you can display the waveform with a delay.

When the process moves to S32, it is determined in S34 whether the data first sent to the D/A converter 30 is the first data stored in the RAM 64.

If this judgment is YES, shift further to the left I~
Since it is not possible, the process is the same as that shown in FIG.
The data of RAM6/I to be outputted to is changed to the previously stored data.

When the process is moved to S33, the D/
A determination is made whether the data passing through A converter 30 (40) is the last data stored in RAM 64.

If this judgment is YES, the process cannot be shifted further to the right, so the process is the same as that shown in Figure 3, and if the judgment is No, S3
In step 7, one piece of RAM 64 data is first output to the D/A converter 30 (40), and then the data [scanned] is output to the D/A converter 30 (40).

Subsequent steps 838, S39 and S40 are S1. shown in FIG. ], S12 and S ], 3, so their explanation will be omitted.

According to this embodiment, if the cell switch 4 is pressed and the branch number is shifted, the reproduced waveform on the screen will be automatically shifted to the left to shift 1, and if the OK switch 5 is kept pressed, the reproduced waveform will be shifted to the left side. Automatically shift to the right. Furthermore, in the case of this embodiment, the supply voltage value of the data sent to the D/A converter 30 (4, 0) first, and the delay time from the captured data are displayed at 825. It is possible to display on 2.

FIG. 7 is a circuit diagram for explaining still another embodiment of the present invention, and in this embodiment, data in the RAM 64 can be stored for a long period of time.

The MPU 60 of this embodiment is supplied with power between Vcc and Vss, and the MPU 60 is of the so-called C-MO8 type. A coil 85b of the relay 85 and a series circuit consisting of a resistor 86, a diode 87, and a rechargeable battery 88 are installed in this power supply line, and the contact 85a of the relay 85 is N.

The contact is connected to the + side, the NC contact is connected to the + side of the battery 88, and the C terminal is connected to the Vcc end of the RAM 64.

When power is supplied, the C terminal and No contact of the relay 85a are electrically connected, and Vcc of the RAM 64 receives this power supply directly. At this time, the battery 88 is charged via the resistor 86 and diode 87. Next, when power is no longer supplied due to, for example, a power outage, the C terminal of relay 85a is electrically connected to the NC contact, so RAM 64 receives power from battery 88, allowing long-term storage of stored data.

FIG. 8 is a diagram for explaining yet another embodiment of the present invention, in which data stored in the RA and M64 can be permanently stored.

90 in the figure is, for example, a floppy disk drive device (
FDD device), MPU 6 via connector 9]
Connected to 0. Therefore, M P '[R of J 60
The data stored in AM64 is F D II) device 9
Permanent preservation is possible by recording on the disk-shaped recording medium 92 of 0. Note that instead of the FDD device 90, for example, a control device such as a personal computer may be used.

According to the configuration of the above embodiment, the M1 measurement data can be saved and redisplayed by combining the oscilloscope and its operation support device. For example, -15 ~ In the example, data for up to 100 seconds can be read and displayed repeatedly on the oscilloscope in a very short time, so this is especially useful for observing waveforms that change over a long period of time and are difficult to confirm on an oscilloscope. It is effective in detecting abnormal signals when there are sporadic abnormalities in the equipment being measured.

In other embodiments, data can be saved, so if the device to be measured is an automobile device, the results may be used to perform an actual vehicle test, memorize the results, take them back to the factory and reproduce them, or explain the results to the customer at a later date. It is extremely useful, and also enables the accumulation and processing of data.

In the above embodiment, the case of measuring automobile equipment was mainly described, but the present invention is not limited to this, and can be applied as an operation support device for an oscilloscope used for measuring other various equipment. be.

〔Effect of the invention〕

Since the present invention has the above-described configuration, it is possible to provide an oscilloscope operation support bag holder that is inexpensive and has high functionality.
Various characteristics such as operability, inspection accuracy, and inspection efficiency are improved.

[Brief explanation of the drawing]

All figures are only for detailed explanation of the invention.
The figure is a front view of the oscilloscope and its operation support device.
The figure is a schematic configuration diagram of the oscilloscope operation support device, FIG. 3 is a flowchart for explaining the control operation of the oscilloscope operation support device according to one embodiment, and FIGS. 4 and 5 are explanations showing examples of display on the display. 6 are flowcharts for explaining control operations according to other embodiments, and FIGS. 7 and 8 are configuration diagrams for explaining still other embodiments. 1: Oscilloscope operation support device, 2: Operator guide display, 3: Reset switch, 4: Set switch, 5: OK switch, 10: Oscilloscope, 11. ・Tube surface, 18
...EXT l~Riga signal input terminal, 20-A, /D
Converter, 21.22・Signal changeover switch, ;30,4
0...D/A converter, 60...MPU,
64...RAM, 88...Battery, 92...
...Disc-shaped recording medium.

Claims (13)

[Claims] (1) Connected to the oscilloscope, including a control means for data processing, a memory for data storage, a display means for displaying operation information of the oscilloscope, an analog/digital converter, and a digital/analog converter. The measurement signal from the device to be measured is repeatedly taken in for a predetermined period of time, and after data processing by the control means, it is stored in the storage memory, and the stored data can be reproduced on the screen of the oscilloscope when necessary. An oscilloscope operation support device characterized by being configured as follows. (2) The oscilloscope operation support device according to claim (1), wherein the device to be measured is an automobile device. (3) In claim (1), when displaying the stored data on the screen of an oscilloscope, a pulse signal from the oscilloscope operation support device is output to an external trigger input terminal of the oscilloscope, and the oscilloscope An oscilloscope operation support device characterized in that the oscilloscope operation support device is configured to be synchronized with the oscilloscope operation support device. (4) The oscilloscope operation support device according to claim (1), wherein the measurement signal can be captured in one channel or two channels. (5) An oscilloscope operation support device according to claim (1), wherein the operation information is a vertical axis knob setting value of an oscilloscope. (6) An oscilloscope operation support device according to claim (1), wherein the operation information is a horizontal axis knob setting value of an oscilloscope. (7) In claim (1), when displaying the stored data on the screen of the oscilloscope, it is possible to display from any data, and subsequent data display is stored in the storage memory. An oscilloscope operation support device characterized in that the oscilloscope operation support device is configured to display images in the order in which the images are displayed. (8) An oscilloscope operation support device according to claim (7), wherein the display means displays an absolute voltage value of first data to be output to the oscilloscope. (9) An oscilloscope operation support device according to claim (7) or (8), wherein the display means displays a delay time of first data to be output to the oscilloscope. (10) The oscilloscope operation support device according to claim (1), wherein a backup power source is connected to the control means. (11) The oscilloscope operation support device according to claim (1), wherein the data storage memory includes an external memory. (12) The oscilloscope operation support device according to claim (11), wherein the external memory is a disk-shaped recording medium. (13) The oscilloscope according to claim (1), characterized in that the time required to capture the measurement signal from the device under measurement is shortened so that it can be reproduced on the tube surface of the oscilloscope. Operation support equipment.