JPH0431770A - Oscilloscope - Google Patents

Abstract

PURPOSE:To make it very easy to discriminate a displayed waveform of each input channel by a construction wherein the luminance of the displayed waveform of each channel is switched by a switching means over to the luminance set by a luminance setting means. CONSTITUTION:When an instruction of making luminance variable is given to a first channel and an indication of fixing the luminance to a second channel from an instruction switch 17, the respective outputs of amplifiers 18 and 19 are synchronous with unblanking signals of corresponding channels which are generated by a trigger and horizontal sweep stage 5, and the luminance of a waveform display of the first channel is set by a set value of a potentiometer 9, while the luminance of the waveform display of the second channel is set by an output voltage of a power source 15. When the instruction of making the luminance variable is given to the second channel and that of fixing the luminance to the first channel from an instruction switch 16, contrariwise, the luminance of the second channel is variable, while the luminance of the first channel is fixed, and thus the luminance is varied for each channel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an oscilloscope in which the brightness of a displayed waveform can be controlled for each input channel.

(Prior Art) In a conventional oscilloscope, a brightness control circuit can be configured for each time axis (main sweep/delay sweep). Some also had an identification function for channel identification.

(Problem to be Solved by the Invention) However, in conventional oscilloscopes, it has not been possible to display at a brightness set for each input channel. Therefore, there was a problem in that the operator had to identify the channel mainly by specifying the vertical position.

Furthermore, even for devices equipped with an identification function for channel identification, the function is operated by the operator when necessary, so it is not possible to clearly identify the signals of each channel during actual operation. There was a problem.

An object of the present invention is to provide an oscilloscope that allows the waveforms of each input channel to be identified even during actual operation by allowing the brightness of the displayed waveform to be set for each input channel.

(Means for Solving the Problems) The oscilloscope of the present invention is configured to display the waveforms of a plurality of input signals substantially simultaneously, and the oscilloscope instructs to change the brightness of the displayed waveform for each channel. brightness setting means for setting brightness for each input channel display waveform;
The apparatus is characterized by comprising a switching means for switching the brightness of the displayed waveform of each channel to the brightness set by the brightness setting means when the instruction means instructs to change the brightness of the displayed waveform. be.

(Operation) In the oscilloscope of the present invention configured as described above, when the instruction means instructs to change the brightness of the displayed waveform for each channel, the brightness of the displayed waveform of each channel is changed by the brightness setting means. The brightness is switched to the set brightness by the switching means. Therefore, when the displayed waveforms of each input channel are displayed substantially simultaneously, the displayed waveforms of each input channel are displayed at the brightness set by the brightness setting means, and the brightness of the displayed waveforms is This can be made different for each channel, making it extremely easy to identify the displayed waveform of each input channel.

(Example) This invention will be explained below with reference to Examples.

FIG. 1 is a block diagram showing the configuration when the present invention is applied to a digital storage oscilloscope, and FIG. 2 is a block diagram showing the configuration of an embodiment of the brightness control portion of the present invention.

The observed input signal input to the input terminal 1 is input to the vertical input stage 2, where the observed input signal is impedance-converted and amplified. The output from the vertical manual stage 2 is input to the vertical output stage 3, where it is amplified and output to the CRT 4 as a vertical deflection signal.

The output signal of the vertical input stage 2 is input as a trigger signal to the trigger/horizontal sweep stage 5, which generates a horizontal sweep signal synchronized with the observed input signal amplified by the vertical input stage 2. Input to output stage 7, amplified and CR
It is output as a horizontal deflection signal at T4.

In the case of a digital storage oscilloscope that digitizes and stores/displays the observed input signal, a first A/D converter that A/D converts the output signal of the vertical human power stage 2;
The horizontal sweep signal output from the trigger/horizontal sweep stage 5 is
A second A/D converter that performs /D conversion, the output data of the first A/D converter is stored as observed input signal data, and the output data of the second A/D converter is read out. Memory used as address data, D/A converter, controls storage of data in memory, controls readout of data stored in memory, processes data as necessary, processes read data or a microcomputer 6 having a CPU that outputs the obtained data to a D/A converter;
Output signal from vertical manual stage 2 and trigger/horizontal sweep stage 5
The output signal from the microcomputer 6 is input to the microcomputer 6, and the output from the D/A converter of the microcomputer 6 is input to the vertical output stage 3.

On the other hand, the trigger/horizontal sweep stage 5 is synchronized with the sweep and uses timing signals 11, 12 for unblanking during the sweep period.
is generated, and the generated unblanking timing signal is output to the brightness control section 8.

The brightness control section 8 outputs a brightness control signal 14 to the CRT 4 in synchronization with the unblanking timing signal.

Furthermore, in this embodiment, the microcomputer 6 receives an output from an instruction switch 16 provided on the operation panel for instructing each channel to change the brightness. Furthermore, in this embodiment, the output voltage from the brightness adjustment potentiometer 9.10 and the voltage from the potential-fixed power supply 15 are controlled in accordance with the switching signal 13 from the microcomputer 6 which receives the output from the instruction switch 16. a multiplexer analog switch (for example, 4053) 17 configured to switch, an amplifier 18 that amplifies the output for the first channel from the multiplexer analog switch 17 only during the unblanking timing signal period of the first channel, The brightness control unit 8 is equipped with an amplifier 19 that amplifies the output from the multiplexer analog switch 17 for the second channel only during the unblanking timing signal period, and the amplifier 1
The surface outputs of 8 and 19 are combined and output from the brightness control section 8 to the CRT 4 as the brightness control signal 14 as described above.

In this embodiment configured as described above, a case of two channels will be explained as an example.

It is assumed that the input to the first channel is as shown in FIG. 2(a), and the input to the second channel is as shown in FIG. 2(b). Vertical input stage 2 to trigger/horizontal sweep stage 5
The signals output to are as shown in FIG. 2(C). The input signals shown in FIGS. 2(a) and 2(b) become inputs to the microcomputer 6, and each input is an A/D
It is converted and stored in the memory provided for each channel of the microcomputer 6.

The horizontal sweep signal for data readout display outputted from the trigger/horizontal sweep stage 5 is as shown in FIG. It is created by converting A.

Further, this clock signal is counted, and data stored in the memory of the microcomputer 6 is read out using the counted data as address data. This read data is D/A converted, supplied to the vertical output stage 3, amplified, and applied to the vertical deflection plate of the CRT 4.

On the other hand, the unblanking timing signals 11 and 12 generated and output by the trigger/horizontal sweep stage 5 are shown in FIG.
e), as shown in FIG. 2(f), the unblanking timing signal shown in FIG. 2(e) is for the input of the first channel, and the unblanking timing signal shown in FIG. 2(f) is for the input of the first channel. The timing signal is for the input of the second channel.

Now, if the instruction switch 16 is giving an instruction to vary the brightness for the first channel and fix the brightness for the second channel, the output voltage from the potentiometer 9 is set as the output for the first channel, The output voltage of the power supply 15 is output for the second channel (〃0〃,
A switching signal 13 of n l // ) is output from the microcomputer 6 to the multiplexer analog switch 17 .

In response to this switching signal, the output voltage from the potentiometer 9 is output to the first channel, the output voltage from the power supply 15 is output to the second channel, and each output is amplified separately by the amplifiers 18 and 19. Both amplified outputs are combined, and the combined amplified output is output from the brightness control section 8 as a brightness control signal 14 shown in FIG. 2(g). Each output of each amplifier 18,19 is connected to the trigger/horizontal sweep stage 5.
The brightness of the waveform display of the first channel is determined by the set value of the potentiometer 9, and the brightness of the waveform display of the second channel is determined by the output voltage of the power supply 15. The brightness of the first channel is variable, the brightness of the second channel is fixed, and the brightness is changed for each channel.

Conversely, if the instruction switch 16 issues an instruction to vary the brightness for the second channel and fix the brightness for the first channel, the output voltage from the potentiometer 10 is output for the second channel. , output the output voltage of the power supply 15 for the first channel ( //
1 n, n Q n ) switching signal 13 is sent from the microcomputer 6 to the multiplexer analog switch 1.
7 is output.

As a result, this switching signal causes the output voltage from the potentiometer 10 to be output to the second channel.
The output voltage of the power supply 15 is output to the first channel, the brightness of the waveform display of the second channel is determined by the setting value of the potentiometer 10, and the brightness of the waveform display of the first channel is determined by the output voltage of the power supply 15. Become. Therefore, the brightness of the second channel is variable, the brightness of the first channel is fixed, and the brightness is changed for each channel.

Note that although the above example illustrates a case where the brightness is changed by switching between the output voltage from the brightness adjustment potentiometer 9.10 and the output voltage of the power supply 15 with a fixed voltage, the voltage of the power supply 15 is not fixed. There is no problem. Furthermore, a similar configuration can be made even when the number of channels exceeds two.

In particular, in the case of a digital storage oscilloscope, since the display time of each channel is constant, the display waveform of each channel can be easily identified, which is highly effective.

(Effects of the Invention) As explained above, in the oscilloscope of the present invention, when the instruction means instructs to change the brightness of the displayed waveform for each channel, the brightness of the displayed waveform of each channel is changed by the brightness setting means. Since the brightness is configured to be switched by the switching means to the set brightness, when the displayed waveforms of each input channel are displayed substantially simultaneously, the displayed waveform of each input channel will be changed to the brightness set by the brightness setting means. The brightness can be made different for each channel, which has the effect of making it extremely easy to identify the displayed waveform of each input channel. In addition, since the displayed waveforms for each channel are identified by changing the brightness of the displayed waveforms, identification becomes clear even during actual operation, and it can be compared even when complex waveforms or overlapping observations are made. It also has the advantage of being easy to identify and easy to identify.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment in which the present invention is applied to a digital storage oscilloscope. FIG. 2 is a block diagram showing the configuration of an embodiment of the brightness control section in the present invention. FIG. 3 is a timing diagram for explaining the operation of one embodiment of the present invention. 2...Vertical input stage, 3...Vertical output stage, 4...C
RT. 5... Trigger/horizontal sweep stage, 6... Microcomputer, 7... Horizontal output stage, 8... Brightness control section, 9
and 10...potentiometer, 11 and 12...
- Timing signal for unblanking, 13... Switching signal, 14... Brightness control signal, 16... Instruction switch, 17... Analog switch for multiplexer. Figure 1

Claims (1)

[Claims] In an oscilloscope configured to display waveforms of a plurality of input signals substantially simultaneously, an instruction means for instructing to change the brightness of the displayed waveform for each channel, and an instruction means for instructing to change the brightness of the displayed waveform for each input channel, respectively. A brightness setting means for setting the brightness, and a switching means for switching the brightness of the displayed waveform of each channel to the brightness set by the brightness setting means when the instruction means instructs to change the brightness of the displayed waveform. An oscilloscope that is characterized by: