JPH01235858A - Operation aiding device for oscilloscope - Google Patents

Abstract

PURPOSE:To display the waveform of a phenomenon on an oscilloscope face by displaying a signal waveform on the tube face in the manner of sending outputs from a trigger circuit and an adding circuit to input signal terminals of the oscilloscope. CONSTITUTION:The oscilloscope 10 consists of a knob for providing a horizontal axis to settle a time value of the tube face display signal, knob for providing a vertical axis to settle tube face waveforms possible to display two channels, probe for detecting the signal to induce a measured signal from an automobile machine, and, etc. The trigger level is adjusted by a trigger adjusting knob. The adding circuit 30, trigger circuit 40 and microcomputer 60 are provided in the operation aiding device 1 for the oscilloscope. The signal come from the probe 15 is inputted to a resistor 32 side in the circuit 30 and the output side of which is connected to the signal input terminals of the oscilloscope 10. In the circuit 40, a pulse signal is automatically detected by the input signal come from the probe 15, and the detected signal is sent out to the oscilloscope 10 and a data processor respectively. The actual waveform of the phenomenon can be thereby displayed on the tube face of the oscilloscope 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oscilloscope operation support device used, for example, in the maintenance and inspection of automobile equipment, and is particularly suitable for editing input signals and displaying them on an oscilloscope. The present invention relates to an oscilloscope operation support device.

[Conventional technology]

Modern automobiles are increasingly equipped with control devices using microcomputers and various electronic devices, and the automobile maintenance industry is now required to use oscilloscopes.

An oscilloscope can be a powerful general-purpose inspection device if you can use it freely, but it is not easy to operate, so the usage varies depending on the operator's level of understanding, and the oscilloscope's functions are often not fully utilized.

Therefore, as part of the solution to this problem, we provide an operation support device that supports the operation of the oscilloscope.

There are strategies for performing various measurement methods. Conventionally known examples regarding this include 1, for example, Japanese Patent Application Laid-Open No. 54-10078.
There is an invention as described in Publication No. 9. This invention displays operating information in front of the cathode ray tube of the oscilloscope.
In addition to operating the oscilloscope by displaying information such as the standard width of the waveform on the screen using figures and characters,
J! This method employs a waveform check method in which one waveform is compared and checked.

[Problem to be solved by the invention]

Even the above-mentioned conventional technology is inappropriate for aa pulse waveforms in which the signal has a short transient period and a long repetition period.

Therefore, an object of the present invention is to provide an oscilloscope operation support device that can edit input signals by combining an inexpensive commercially available oscilloscope and an oscilloscope operation support device, and display the actual phenomenon waveform on the oscilloscope screen. It is about realization.

[Means for solving aM] In order to achieve the above-mentioned object, the present invention provides a signal automatic reading means for automatically detecting the generation timing of an I-sign from a device to be measured such as an automobile device, and a means for automatically reading the signal. The object of the present invention is an oscilloscope operation support device that is connected to and functions as an oscilloscope, and includes a data processing means for processing a signal received from the device under measurement, and an addition means for adding a predetermined signal to the signal from the device under measurement. .

The apparatus is characterized in that the output from the automatic signal reading means and the output from the addition means are outputted to an input signal end of the oscilloscope to display a signal waveform on a tube surface.

Furthermore, in order to achieve the above-mentioned object, the present invention includes a trigger circuit that detects the generation time of an I-sign from a device to be measured, and data that inputs a read signal from the device to be measured and the output of the trigger circuit and processes the data. processing means and the wave meter '1
It is equipped with an addition means for adding the read signals from the IAVa device and an operation information input means for inputting information from the operator.

The target is an oscilloscope operation support device that is connected to an oscilloscope and functions.

Then, the output of the trigger circuit and the output of the adding means are respectively input to the trigger input end and the signal input end of the oscilloscope to be displayed on the screen, and the display time period of the displayed waveform is set on the screen by the operation information input means. The present invention is characterized in that a waveform moving means for moving the waveform is provided.

〔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. FIG. 4 is a diagram showing a display example of an oscilloscope, FIG. 5 is a diagram showing a waveform at a specific point in FIG. 2, and FIGS. 6, 7, and 8 are explanatory diagrams showing each display example.

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

In these figures, 1 is an oscilloscope operation support device according to an embodiment, which is used in combination with an oscilloscope 10. Reference numeral 2 is an operator guide display consisting of a CRT display or liquid crystal display element, which displays operating guide information in text, 3 to 6 are switch groups, 3 is a reset switch, 4 is a set switch for setting test numbers, etc. 5 is an OK switch for issuing a response signal in response to an instruction on the display 2; 6 is a power switch, 7 and 9 are trigger-related knobs, polarity changeover switch 7 is a switch for selecting positive or negative trigger, 9 is a level adjustment knob for adjusting the trigger level, aa is a signal search probe 15. This is a signal branch line for branching the measurement signal from 16 to this operation support bag @l.

Reference numeral 10 is an oscilloscope commonly used for maintenance and inspection of automobile equipment, and reference numeral 11 is a horizontal axis setting knob for setting the time value of the signal displayed on the screen.

13 and 14 are vertical axis setting knobs for setting the voltage value of the tube waveform that can be displayed on two channels;
5 and 16 are signal search probes that introduce measurement signals from automobile equipment, 17 is a knob for setting the time axis (horizontal axis), and 18 is an external (EXT) trigger signal input terminal, which is connected to the oscilloscope operation support bag. [Input the trigger signal from 1 to the oscilloscope 10. Reference numeral 19 is a trigger adjustment knob for adjusting the trigger level, and reference numeral 20 is a trigger source selection knob for selecting an internal/external signal as the trigger source.

Next, the configuration of the oscilloscope operation support bag Ul will be explained using FIG. As shown in the figure, for example, the CHI number a search probe 15 is connected to an adder circuit 30 and a trigger circuit 40.

The adder circuit 30 is composed of resistors 32, 33, 34 and an operational amplifier 31, and is a circuit that adds the inputs to the resistor 34, 32 and outputs the result. The output side is connected to the signal input end of the oscilloscope 10.

The trigger circuit 40 includes a differentiating circuit composed of a capacitor 41 and a resistor 42, a circuit composed of a polarity changeover switch 7 and a variable resistor 9 for adjusting the trigger level, and an output from the differentiating circuit and the variable resistor 42. The voltage comparator 43 inputs and compares the output from the resistor 9.

Then, a pulse signal is automatically detected from the input signal from the probe 15, and automatic reading (
trigger).

In the figure, 60 is a microcomputer (M r' U), and 50 is a 6D/6D converter that converts digital data into analog values.
A converter, 62 is a ROM, and 64 is a RAM. Said M
r'U60 is a D/A converter 50° operator guide display 2. It is connected to the ROM 62 and RAM 64 via a bus. Further, 55 is an AND gate, one input end and output end of which are connected to MI'U60,
The output is also connected to the trigger terminal 1 of the oscilloscope 10, and the other input terminal is connected to the input side of the trigger circuit 40. Further, the reset switch 3. The set switch 4 and the OK switch 5 are also connected to the MPU 60.

Next, the operation of this oscilloscope operation support device will be explained using FIGS. 3, 4, and 5.

The example shown in FIG. 4(a) is an example in which an injection valve control signal of an automobile fuel injection device is displayed on an oscilloscope. In this embodiment, the signals shown in (a) of the same figure are converted to (a) and (b) of (b) of the same figure.

An example of editing and displaying in parallel is shown in (d).

After observing the signals from the automobile equipment, the operator starts the control operation based on the flowchart shown in FIG.

First, in step 1 (Sl), the MPU 60 determines the number of columns (M) to be displayed in parallel on the oscilloscope screen, and the external (EXT) to the oscilloscope after the -degree trigger is activated.
An instruction is given to set a mask time (T) for masking the signal input to the trigger signal input terminal 18. The operator sets these instructions while viewing the waveform displayed on the tube surface 11 of the oscilloscope 10.

An example of setting the number of columns will be explained with reference to FIG.

What is shown in this figure is the display content for instructing the setting of the number of columns on the guide display 2, in this case.

r' on the display screen OK? The J part is now flashing. The operator sees this and presses the set switch 4, and each time he presses it, 2 of 5ET = 2 becomes 3.4.5...
...It is updated in the order of 8 and 1. The operator selects and sets one of them, and presses the OK switch 5, and the MPU 50 sets this data as M to the RA.
Register at the specified address of M64. Similarly, the mask time T can also be registered in the RAM 64.

FIG. 7 is a display example of a mask time setting instruction.

Here r 5 m S OK? Make sure that the J part flashes (so the operator can press Sets, R, 4, and each time the time value changes to 5, 6, etc.).
...is updated and displayed. The operator sets the target mask time and presses the OK switch 5.

This allows the mask time T to be registered at a predetermined address in the RAM 64.

Next, at 82, output data D from the D/A converter 50 per parallel number is calculated. If the input data to the D/A converter 50 is 8 bits, the maximum is 255, so D=255/(M-1) is expressed by equation 1.

Next, in step 83, instructions are given to set knobs for the vertical axis, horizontal axis, trigger position, etc. An example of this instruction is shown in FIG.

First, set the trigger source selection knob 20 of the oscilloscope 10 to °'EXT" (trigger by external No. 43) mode,
Trigger adjustment knob 19 and trigger force knob 9 of support device 1
, and the polarity switch 7 to display the input signal stably on the screen. In this case, Mr'U 60 opens the AND gate 55 and is set in a state where a signal can be input to the external trigger signal input terminal 18 of the oscilloscope 10.

Further, the vertical axis setting knob 13 and the horizontal axis setting knob 17 of the oscilloscope 10 are instructed to values that will be the optimum position for parallel display. The operator carries out these instructions and
If OK, press OK switch 5 and proceed to step 84. Mr.
'tJ60 replaces the number of parallels M with the loop variable N in S4.

S50 to S557 show the steps when the OK switch 5 and the set switch 4 are not pressed and when they are pressed. If it is determined in S50 that the OK switch 5 is not pressed, the process moves to 554. At S54, the set switch 4 is checked, and if it is not pressed, the process moves to S5.

In S5, the process of M-1=H is executed, and in S6, the DXN data corresponding to equation 1 is inputted into the D/A converter 50, converted to an analog value, and sent to the adder 34. This signal becomes a staircase signal with a downward staircase shape, as shown in FIG. 5(d). In S7, the trigger signal shown in FIG. 5(C) is waited for, and when the trigger signal is output, as shown in FIG. 5(d),
The AND gate 55 is closed for the mask time T registered by the operator to prevent the trigger signal from entering the Mr'U 60 and the external trigger signal input terminal 18 of the oscilloscope 10 (S8). In this case, the sweep time of the tube surface is 1 with the value specified in S3. For example, if the time axis setting corresponding to that shown in FIG. 5(e) is made on the oscilloscope 10, the time axis shown in FIG. A waveform is obtained.

Next, in 89, it is determined whether N=O, and if NO, the process returns to S50, and if YES, the process returns to S4, and the above series of operations is repeated. As described above, when the input signal 15 is S, the output of the D/A converter 50 can be divided (staircase) into S, S+2D, S+D, and S, and the ffi pressure signal can be repeatedly output. Then, when the mask time T is set smaller than the pulse period (double amount Ero interval) as shown in Fig. 5, the oscilloscope 1
The external trigger signal input terminal 18 of 0 is triggered for each input signal as shown in FIG. Parallel display waveforms are obtained according to the number of columns specified.

If the mask time T is set to be longer than the pulse period shown in FIG. 5(a), the parallel waveforms can be displayed at intervals of one or more of the original waveforms. That is, FIG. 4(a)
The series path waveforms are (a), (b), and (c) in the same figure (b).
It will be edited and displayed as parallel pulse waveforms enlarged in this order.

Next, the case where the OK switch 5 is pressed in S50 of FIG. 3 and the case where the Seratos switch 4 is pressed in S54 will be described.

When the OK switch 50 is pressed in S50, the process moves to 351,
The time obtained by adding Δt to the mask time T is newly registered as a mask time, and this mask time Tffi's 52: is displayed on the display 2, and the process moves to 85 described above.

FIG. 9 shows an example of the display. For example, before processing S51, T
= 15 m s + Δt = 1 m s, the mask period after execution of S51 is set to 16 ms, and the gate 55 is controlled and displayed as shown in FIG. 9. 5519. S52 changes Δ every time OK switch 5 is pressed.
Process to add t.

If the period of the 42 pulse signals shown in Fig. 5 is 15 m5, the oscilloscope display waveform will be as shown in Fig. 5 (
b), and until 15<T<30, Fig. 5 1d)
Since T exceeds the pulse signal port, the pulse signal port is no longer displayed and the primary pulse signal [pulse signal (c) in Figure 4] is skipped over in place of the borrowed waveform port in Figure 5(b). will be displayed. The operator can manipulate this change while observing it with an oscilloscope.

Similarly, if the set switch 4 is pressed in 854, the process moves to S55, and T-Δ1=0, that is, the mask time T
Determine the minimum value of and, except for this case, if NO, proceed to S5
6, the mask time is changed by executing the process T-8t=T in the same way as 851, and the changed mask time T is displayed on the display 2 (S57).

By doing as described above, for example, when performing It) iFI of sporadic abnormal pulses, the interval between the number of abnormal pulses and only the abnormal pulses can be displayed in parallel, which is useful as an applied measurement using an oscilloscope.

According to this embodiment, it is possible to display waveforms in parallel using an apparatus using a commercially available oscilloscope, and furthermore, the operator can perform interlaced display of pulse signals by simple operations while viewing the oscilloscope.

〔Effect of the invention〕

According to the present invention, it is possible to realize an oscilloscope operation support device that is inexpensive and has high functionality, and has a great effect on improving the reliability of maintenance and the like.

[Brief explanation of the drawing]

All figures are for detailed explanation of the present invention.
2 is a schematic configuration diagram of the oscilloscope operation support device according to the embodiment; FIG. 3 is a flowchart for explaining the control operation of the oscilloscope operation support device; FIG. The figure shows the table of the oscilloscope.1... Oscilloscope operation support device, 2... Operation guide display, 3... Reset switch, 4... Sets, C , 5
...OK switch, 9.10...Trigger level adjustment knob, 10...Oscilloscope, 30...Addition circuit, 40...Trigger Circuit, 50...D/A converter, 55...
・AND gate, 60...Microcomputer, 62...ROM, 64...RAM
. Figure 3 Figure 4 Figure 5

Claims (17)

[Claims] (1) Automatic signal reading means that automatically detects the generation timing of a signal from the device under test, data processing means that processes the read signal, and adds a predetermined signal to the signal from the device under test. In an oscilloscope operation support device that is connected to an oscilloscope and functions, the output from the signal automatic reading means and the output from the addition means are outputted to an input signal end of the oscilloscope for management. An oscilloscope operation support device characterized by displaying a signal waveform on a screen. (2) In claim (1), the predetermined addition signal of the adding means is obtained by providing a digital/analog converter in the data processing means and outputting the output data from the data processing means to the digital/analog converter. An oscilloscope operation support device characterized in that the output signal is converted into an analog value by the converter. (3) In claim (1), the output of the automatic signal reading means is configured to be input to an external trigger input terminal of the oscilloscope via a signal cutting means controlled by a data processing means. An oscilloscope operation support device characterized by: (4) In claim (3), the signal cutoff means is provided with a signal input means for manually or automatically inputting a signal to the data processing means, and the cutoff time of the signal cutoff means is set by the signal input means. An oscilloscope operation support device characterized in that it is configured to be able to perform the following operations. (5) In claim (4), the output value of the analog signal can be set as divided signals at predetermined time intervals by the signal input means, and the signal waveforms can be displayed in parallel on the tube surface of the oscilloscope. Oscilloscope operation support device. (6) The oscilloscope operation support device according to claim (1), further comprising display means capable of displaying operation information of the oscilloscope. (7) The oscilloscope operation support device according to claim (6), wherein the display contents instructed by the display means are voltage axis and time axis setting knob values on the oscilloscope tube surface. (8) The oscilloscope operation support device according to claim (6), wherein the display content instructed by the display means is a trigger-related knob value. (9) In claim (5), the predetermined time is:
An oscilloscope operation support device characterized in that the input signal period is an integral multiple of the input signal period. (10) The oscilloscope operation support device according to claim (1), wherein the predetermined addition signal of the addition means is a constant voltage value. (11) A trigger circuit that detects the generation timing of a signal from the device under test, a data processing means that inputs and processes the read signal from the device under test and the output of the trigger circuit, and reads from the device under test. In an oscilloscope operation support device that is connected to an oscilloscope and functions, the oscilloscope operation support device includes an addition device that adds a predetermined signal to a signal, and an operation information input device that can input information from an operator. Waveform moving means is provided for inputting the output of the means to a trigger input end and a signal input end of the oscilloscope and displaying it on a screen, and for moving the display time period of the displayed waveform on the screen by the operation information input means. An oscilloscope operation support device characterized by: (12) The oscilloscope operation support device according to claim (11), wherein the waveform moving means is configured to mask at least a portion of the display to enable intermittent display. (13) The oscilloscope operation support device according to claim (12), further comprising means for changing the display mask time. (14) The oscilloscope operation support device according to claim (12), wherein the display mask time is an integral multiple of the waveform change period of the displayed observation target waveform. (15) The oscilloscope operation support device according to claim (11), further comprising display means capable of displaying operation information of the oscilloscope. (16) The oscilloscope operation support device according to claim (15), wherein the display contents by the display means are voltage axis and time axis setting knob values on the oscilloscope tube surface. (17) The oscilloscope operation support device according to claim (15), wherein the content displayed by the display means is a trigger-related knob value.