JP2560604Y2 - Multi-phenomenon oscilloscope - Google Patents

Description

The present invention relates to a multi-phenomenon oscilloscope, and more particularly to a multi-phenomenon oscilloscope suitable for simplifying a channel switching operation when displaying a large number of signals.

(B) Conventional technology As a conventional multi-phenomenon oscilloscope, for example, the one shown in the block diagram of FIG. 3 has been provided.

In the figure, 21 to 23 are first to n-th signal input terminals,
Reference numerals 24 to 26 denote first to n-th signal amplifier circuits, 27 denotes a display channel switching circuit, 28 denotes a display device, 29 denotes a horizontal sweep circuit, and 30 denotes a trigger signal switching circuit.

The circuit block configuration is such that signal amplifiers 24 to 26 are connected to the first to n-th signal input terminals 21 to 23, respectively, from the outputs of the signal amplifiers 24 to 26, the display channels 27 and , And a trigger signal switching circuit 30.

The output from the trigger signal switching circuit 30 is
The horizontal sweep circuit 29 outputs a sawtooth signal that is driven to be swept in the horizontal direction.

Further, from the horizontal sweep circuit 29, a switching signal (for example, an alternate or chop signal) for switching the display channel switching circuit 27 is connected to the display channel switching circuit 27.

To explain the operation of the circuit block, the signal input terminals 21 to
The signal input from 23 is amplified by a predetermined amount in signal amplifier circuits 24-26 and applied to a display channel switching circuit 27, while a trigger signal switching circuit 30 is used to manually operate a signal from which channel to trigger the horizontal sweep circuit 29. Is selected.

The signal amplification circuits 24 to 24 selected by the trigger signal switching circuit 30
The input signal from 26 becomes the trigger signal and becomes the horizontal sweep circuit.
29 is started, and a switching signal is output to the display channel switching circuit 27 in accordance with the sweep switching method that is selected from the alternate sweep, the chop sweep, and the manual.

In addition, the horizontal sweep circuit 29 outputs a sawtooth signal for sweeping the display device 28 according to the above-described sweep switching method.

Therefore, in the display channel switching circuit 27, the input signals from the signal amplifier circuits 24 to 26 are switched based on the switching signal from the horizontal sweeping circuit 29 and transmitted to the display device 28 for display.

(C) Problems to be Solved by the Invention However, in the conventional multi-phenomenon oscilloscope described above, when a plurality of signal inputs are to be displayed on the display device 28 as shown in FIG. It is difficult to determine which waveform is displayed on the display device 28, and conversely, even if one input signal is added, it is necessary to perform operations such as channel setting in accordance with the input signal. .

In addition, when many channels are used in many combinations, the operation is further complicated.

This invention has been made in view of the above points,
The purpose is to provide a multi-phenomenon oscilloscope that eliminates the drawbacks of the conventional example and that does not require channel selection setting to display which channel the signal is input to even when observing multiple signals. .

(D) Means for Solving the Problem The multi-phenomenon oscilloscope of the present invention includes a display device for displaying a waveform, a plurality of signal amplifier circuits for amplifying and outputting an input signal, and signals from the plurality of signal amplifier circuits. A display channel switching circuit for switching the output to the display device, a trigger signal switching circuit for outputting a trigger signal in response to outputs from the plurality of signal amplifier circuits, and receiving an output from the trigger signal switching circuit. A horizontal sweep circuit that outputs a sweep signal to the display device and outputs a signal synchronized with the sweep signal; and a multi-phenomenon oscilloscope that displays a plurality of signal waveforms on a single display screen. A plurality of signal presence / absence determination circuits for determining presence / absence of output signals output from the plurality of combined signal amplification circuits, respectively A display for outputting a trigger signal switching signal in response to signals from the plurality of signal presence / absence determining circuits and outputting a channel switching signal to the display channel switching circuit in response to a signal synchronized with the sweep signal from the horizontal sweep circuit; A channel determination circuit;
A trigger signal switching circuit for selecting an output signal from the signal amplifying circuit corresponding to a trigger signal switching signal from the display channel discriminating circuit and outputting a trigger signal is provided.

The display device may further include a selection channel display circuit for transmitting channel display data of a channel corresponding to an output signal from the plurality of signal presence / absence determination circuits in accordance with an output signal from the plurality of signal presence / absence determination circuits. It was done.

(E) Function According to the present invention, a display device for displaying a waveform, a plurality of signal amplifier circuits for amplifying and outputting an input signal, and switching signals from the plurality of signal amplifier circuits to output to the display device A display channel switching circuit, a trigger signal switching circuit for outputting a trigger signal corresponding to an output from the plurality of signal amplifier circuits, and a sweep signal to the display device upon receiving an output from the trigger signal switching circuit. And a horizontal sweep circuit that outputs a signal synchronized with the sweep signal, and a multi-phenomenon oscilloscope that displays a plurality of signal waveforms on a single display screen. A plurality of signal presence / absence determining circuits for determining the presence / absence of output signals output from the combined plurality of signal amplifying circuits; and a signal from the plurality of signal presence / absence determining circuits. And a display channel discriminating circuit for outputting a trigger signal switching signal in response to the signal and receiving a signal synchronized with the sweep signal from the horizontal sweep circuit and outputting a channel switch signal to the display channel switching circuit. And a trigger signal switching circuit for selecting an output signal from the signal amplifying circuit corresponding to the trigger signal switching signal and outputting a trigger signal.

Also, the display device includes a selection channel display circuit for transmitting channel display data of a channel corresponding to the output signal from the plurality of signal presence / absence determination circuits in accordance with the output signals from the plurality of signal presence / absence determination circuits. , The input signal is displayed automatically when observing multiple signals,
In addition, since which channel is indicated, there is no need for a selection operation, and the observation operation is facilitated.

(F) Example The first example of the multi-phenomenon oscilloscope according to the present invention is given below.
Explanation will be made based on FIG. 2 and FIG.

FIG. 1 is a circuit block diagram of the present invention, and FIG. 2 is a circuit block diagram having a channel display function.

In the figure, 1-3 are signal input terminals, 4-6 are signal amplifiers,
7 to 9 are signal presence / absence determination circuits, 10 is a display channel determination circuit, 11 is a display channel switching circuit, 12 is a horizontal sweep circuit,
13 is a trigger signal switching circuit, 14 is a display device, and 15 is a selected channel display circuit.

As for the configuration of the circuit block, the outputs of the signal amplifier circuits 4 to 6 to which the signal input terminals 1 to 3 are connected are supplied to the display channel switching circuit 11, the signal presence / absence determination circuits 7 to 9, and the trigger signal switching circuit 13. Each is connected.

Outputs of the signal presence / absence determination circuits 7 to 9 are connected to a display channel determination circuit 10, and a switching signal for switching display channels is applied from the display channel determination circuit 10 to a display channel switching circuit 11.

Further, from the display channel discriminating circuit 10, a switching signal for switching the signals from the signal amplifying circuits 4 to 6 added to the trigger signal switching circuit 13 and selecting the trigger signal to the horizontal sweep circuit 12 is sent to the trigger signal switching circuit 13. Have been added.

A trigger signal is applied from the trigger signal switching circuit 13 to the horizontal sweep circuit 12, and a display device is output from the output of the horizontal sweep circuit 12.
A sweep signal for sweeping the drive 14 is connected to the display device 14.

Further, a display channel discriminating circuit is provided from the horizontal sweep circuit 12.
10 is connected to a signal synchronized with an alternate sweep or chop sweep signal.

The operation of the circuit block is as follows. The input signal applied to the signal input terminals 1 to 3 and amplified by a predetermined amount in the signal amplifier circuits 4 to 6 is applied to the display channel switching circuit 11 while the signal level is determined by the signal presence / absence determination circuits 7 to 9 Is determined.

Signals are output to the display channel determination circuit 10 for the channels for which the signal presence / absence determination circuits 7 to 9 determine that there is a signal level.

The display channel discriminating circuit 10 which has received a signal from the channel having the signal level from the signal presence / absence discriminating circuits 7 to 9 triggers a switching signal for switching the trigger signal switching circuit 13 in accordance with the channel having the signal level. The signal is output to the signal switching circuit 13.

In the trigger signal switching circuit 13, the display channel discriminating circuit 10
When the switching signal is received from the signal amplification circuits 4 to 6, a signal corresponding to the switching signal is selected from the channel signals from the signal amplification circuits 4 to 6, and is transmitted to the horizontal sweep circuit 12 as a trigger signal.

The horizontal sweep circuit 12 receives the trigger signal from the trigger signal switching circuit 13, sends out a sawtooth wave signal as a horizontal sweep signal to the display device 14, and outputs a signal synchronized with the sawtooth signal to the display channel discriminating circuit 10. Output to

In the case of alternate display due to multiple phenomena, the display channel discriminating circuit generates a signal for alternate display based on a signal synchronized with the sawtooth wave signal and sends the signal to the channel display circuit. The display channel discriminating circuit 10 which has received the signal synchronized with the sweep signal from the horizontal sweep circuit 12 sends a switching signal to the display channel switching circuit 11 so as to display only the channel which has received the signal from the signal presence / absence discriminating circuits 7 to 9. I do.

The display channel switching circuit 11 switches the input signals from the signal amplifier circuits 4 to 6 based on the switching signal sent from the display channel discriminating circuit 10 and outputs it to the display device 14 to display the input signal on the display device 14. Is done.

If the signals input to the signal input terminals 1 to 3 as described above are a plurality of signal inputs or a signal input of only one channel, a channel switching operation for display becomes unnecessary, and the observation operation can be simplified. it can.

An embodiment provided with a function for indicating which channel is currently displayed as shown in FIG. 2 will be described. The output of the signal presence / absence determination circuits 7 to 9 and the display device
The signal presence / absence determination circuits 7 to 9 send signals to the selected channel display circuit 15 only for channels having a signal level.

When a signal is transmitted from the signal presence / absence determination circuits 7 to 9, the selected channel display circuit 15 displays channel display data corresponding to the channel of the transmitted signal on the display device.
It is sent to the display 14 and displayed on the display device 14 simultaneously with the input signal.

Therefore, the operation for displaying the input signal can be simplified, and the channel of the automatically input signal can be clearly displayed.

This invention can also be applied to a trigger signal selection determination function to activate the horizontal sweep circuit 12 using a signal of a channel having a specific trigger level or higher as a trigger signal.

In addition, a single-effect oscilloscope having a plurality of input terminals and automatically selecting and displaying the input signal regardless of which input terminal receives the signal can be used.

Furthermore, it is possible to provide a number of external synchronization signal input terminals, determine which input terminal the synchronization signal is input to, and automatically use the input signal as a synchronization signal.

According to the multi-phenomenon oscilloscope according to the present invention, in a multi-phenomenon oscilloscope displaying a plurality of signal waveforms on one display screen, a signal presence / absence determination circuit for determining the presence / absence of a plurality of input signals, According to the output of the signal presence / absence determination circuit, a display channel determination circuit for selecting a channel to be displayed is provided, and further, a selection channel display circuit for displaying which channel is currently displayed is provided. When observing a plurality of input signals, it is not necessary to determine which channel the signal is being input to, so that the operation is simplified.

Further, a switch for selecting a channel on the oscilloscope panel can be omitted. Further, since the channel being displayed is indicated, there is an effect that the observation work becomes easier.

In addition, it has excellent features such as simple structure and easy implementation because it can be configured at low cost.

[Brief description of the drawings]

1 and 2 show an embodiment of the multi-phenomenon oscilloscope according to the present invention. FIG. 1 is a circuit block diagram of the present invention, and FIG. 2 is a circuit block diagram having a channel display function. FIG. 3 is a circuit block diagram of a conventional example. Explanation of main reference numerals 1-3: 1st to nth signal input terminals 4 to 6: 1st to nth signal amplifier circuits 7 to 9: 1st to nth signal presence / absence determination circuits 10: display channel determination Circuit 11: Display channel switching circuit 12: Horizontal sweep circuit 13: Trigger signal switching circuit 14: Display device 15: Selected channel display circuit

Claims (2)

(57) [Scope of request for utility model registration] 1. A display device for displaying a waveform, a plurality of signal amplifying circuits for amplifying and outputting an input signal, and a display channel switching circuit for switching a signal from the plurality of signal amplifying circuits and outputting the signal to the display device A trigger signal switching circuit that outputs a trigger signal in response to outputs from the plurality of signal amplifier circuits; a trigger signal switching circuit that receives an output from the trigger signal switching circuit and outputs a sweep signal to the display device; A multi-phenomenon oscilloscope that includes a horizontal sweep circuit that outputs a signal synchronized with the plurality of signal amplifier circuits, and displays a plurality of signal waveforms on a single display screen. A plurality of signal presence / absence determination circuits for determining the presence / absence of an output signal output from the signal amplification circuit; and a trigger in response to signals from the plurality of signal presence / absence determination circuits A display channel discriminating circuit for outputting a signal switching signal and receiving a signal synchronized with the sweep signal from the horizontal sweep circuit and outputting a channel switch signal to the display channel switching circuit; and a trigger signal from the display channel discriminating circuit. A multi-phenomenon oscilloscope comprising: a trigger signal switching circuit for selecting an output signal from the signal amplification circuit corresponding to a switching signal and outputting a trigger signal. 2. A selection channel display circuit for transmitting channel display data of a channel corresponding to an output signal from the plurality of signal presence / absence determination circuits to the display device in accordance with an output signal from the plurality of signal presence / absence determination circuits. The oscilloscope according to claim 1, wherein the oscilloscope is provided.