JPH1138046A - Oscilloscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscilloscope that can independently set the time bases of a plurality of channels, broaden the range of oscilloscope utilization methods and improve operability. SOLUTION: Each channel signal can be displayed on the same screen at a different time base by providing a plurality of sweep generators 14A and 14B corresponding to a plurality of channel signals 1 and 2 to be input, making it possible to arbitrarily set a frequency of each sweep generator corresponding to each channel and selecting the corresponding sweep generators 14A and 14B by channel selector switches 13a and 13b when displaying each channel. This constitution makes it possible to finish measurement by performing measuring work once at a desired time base by channels for effective utilization of an oscilloscope.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an oscilloscope capable of simultaneously measuring and displaying a plurality of channel signals, and more particularly to an oscilloscope capable of setting a time axis on a display screen for each channel.

[0002]

2. Description of the Related Art As a conventional oscilloscope, there is provided an oscilloscope having a configuration for simultaneously measuring a plurality of channel signals and displaying each signal on a display screen. FIG. 3 is a block circuit diagram of a conventional oscilloscope. Channel 1
The input signal input from the input terminal 1 and the input signal input from the input terminal 2 of the channel 2 are respectively amplified by the amplifier 3 and then one of them is selected by the channel switch 4. The selected signal passes through the vertical amplifier 5, the delay circuit 6, and the vertical output
It reaches the vertical deflection electrode of T (cathode ray tube) 9. Reference numeral 8 denotes a Z-axis circuit. At the same time, the signal of the selected channel 1 is also selected and input from the amplifier 3 to the trigger amplifier 10 and reaches the horizontal deflection electrode of the CRT 9 through the trigger circuit 11, the sweep generator 12, and the horizontal output amplifier 16. . Thereby, the input signal of channel 1 is displayed on the CRT screen. The same applies when the signal of channel 2 is input by the channel switch 4.
By performing this channel switching at high speed, one C
It becomes possible to display input signals of a plurality of channels on the display screen of the RT9.

[0003]

In this conventional oscilloscope, when a plurality of channels are simultaneously measured, displayed on a display screen, and observed, the frequency of a sweep signal serving as a horizontal deflection signal in each channel is constant. The length (interval) of the time axis on the screen of each channel is the same. Therefore, when the frequency of each signal of one channel is significantly different from the frequency of each signal of another channel, if the time axis is set in accordance with one channel, the waveform of the signal of the other channel may not be confirmed. . As described above, in the conventional oscilloscope, the time axis of a plurality of channels cannot be set independently, and therefore, even if a plurality of channel signals are displayed at the same time, the function cannot be effectively exerted. There is a problem that it cannot be realized. In the digital oscilloscope, a device for controlling the time for screen display and stabilizing the display waveform based on the held data has been proposed in Japanese Patent Application Laid-Open No. 61-66167. The data is changed on the same time axis, and each channel cannot independently set a time interval.

[0004] It is an object of the present invention to provide an oscilloscope capable of independently setting the time axis of a plurality of channels, thereby expanding the use of the oscilloscope and improving operability. It is in.

[0005]

According to an oscilloscope of the present invention, a plurality of channel signals are inputted, and the waveforms of these channel signals are displayed on a time axis. It is characterized in that it can be displayed on the same screen. That is, the present invention provides a vertical deflection circuit which receives a plurality of channel signals, selects one of these channel signals to generate a vertical deflection output, and a horizontal deflection circuit which is simultaneously selected to generate a horizontal deflection output. An oscilloscope comprising a display for displaying each channel signal based on each output of the vertical deflection circuit and the horizontal deflection circuit, wherein the horizontal deflection circuit includes a plurality of sweep generators each set to a different frequency. And one of the channel signals is selected at the same time. The plurality of sweep generators are provided in the same number as the plurality of channel signals,
It can be selected according to the selection of the channel signal,
In addition, each sweep generator is set to an arbitrary frequency corresponding to each channel signal.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block circuit diagram of an embodiment of the present invention. FIG. 1 shows a configuration in which the present invention is applied to a two-channel oscilloscope, and portions equivalent to those in the conventional configuration shown in FIG. The input signal input from the input terminal 1 of the channel 1 and the input signal input from the input terminal 2 of the channel 2 are respectively amplified by the amplifier 3 and then one of them is selected by the channel switch 4. The selected signal passes through a vertical amplifier 5, a delay circuit 6, and a vertical output amplifier 7, and reaches a vertical deflection electrode of a CRT (cathode ray tube) 9. Reference numeral 8 denotes a Z-axis circuit.

On the other hand, the signal of the selected channel 1 is also selected and input from the amplifier 3 to the trigger amplifier 10, passed through the trigger circuit 11, and then interlocked with the channel switch 4 a. , 13b is connected to one of the number of channels, that is, in this embodiment, one of the two channel-by-channel sweep generators 14A, 14B arranged in parallel. These channel-based sweep generators 14A and 14B are constituted by sawtooth wave generators, and have different periods (frequency) as shown in FIG. After passing through the selected channel-specific sweep generator, the horizontal output amplifier 1
6 and reaches the horizontal deflection electrode of the CRT 9. Thereby, the input signal of channel 1 is displayed on the CRT screen based on the time axis set by the output of the horizontal output amplifier 16. The same applies when the signal of channel 2 is input by the channel changeover switch 4.

Therefore, when the channel changeover switches 4 and 13a and 13b are operated to perform the measurement of the input signals of the channels 1 and 2, and the waveform obtained from the measurement is displayed on the CRT 9, the signals obtained by the respective channels are not changed. When the sweep generators 14A and 14B are selected,
The display on the time axis based on the sweep signal of the frequency set in the sweep generators 14A and 14B for each channel is executed. Thereby, even when the input signals of the channels 1 and 2 are simultaneously displayed on the CRT, the display time axis of the channel 1 and the channel 2 can be set independently, and the time axis optimal for the signal of each channel can be set. Can be displayed. For example, even when the frequencies of the input signals of channels 1 and 2 are significantly different, if the time axes are significantly different, the input signals of each channel can be displayed in a suitable state.

Here, the present invention relates to n (n is an integer of 3 or more)
The present invention can be similarly applied to an oscilloscope that can input a channel input signal. In this case, n channel-specific sweep generators corresponding to each channel are arranged in parallel,
What is necessary is just to make it selectively switch with a channel change switch. Further, it is needless to say that the sweep generator for each channel is configured such that the frequency of the sweep signal can be individually adjusted, so that the time axis of each channel can be set arbitrarily and independently.

[0010]

As described above, the present invention includes a plurality of sweep generators corresponding to a plurality of input channel signals, and the frequency of each sweep generator can be arbitrarily set corresponding to each channel. Since each channel signal is displayed on the time axis based on the sweep signal of the corresponding sweep generator when displaying each channel signal, each channel signal is displayed on the same screen with a different time axis. This makes it possible to perform a measurement on a desired time axis for each channel in a single measurement operation, thereby effectively utilizing the oscilloscope.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of an oscilloscope embodiment of the present invention.

FIG. 2 is a waveform diagram showing an example of a sweep signal of a sweep generator for each channel.

FIG. 3 is a block circuit diagram of an example of a conventional oscilloscope.

[Explanation of symbols]

 1, 2 input terminal 3 amplifier 4 channel switch 5 vertical amplifier 6 delay circuit 7 vertical output amplifier 8 Z-axis circuit 9 CRT 10 trigger amplifier 11 trigger circuit 13a, 13b channel switch 14A, 14B Sweep generator for each channel 16 horizontal output amplifier

Claims (3)

[Claims] 1. An oscilloscope that receives a plurality of channel signals and displays the waveforms of these channel signals on a time axis, wherein the plurality of channel signals can be displayed on the same screen on different time axes. An oscilloscope characterized by the following. 2. A vertical deflection circuit which receives a plurality of channel signals and selects one of the channel signals to generate a vertical deflection output, a horizontal deflection circuit which is selected at the same time and generates a horizontal deflection output, and In an oscilloscope comprising a display for displaying each of the channel signals based on each output of the vertical deflection circuit and the horizontal deflection circuit, the horizontal deflection circuit includes a plurality of sweep generators each set to a different frequency. An oscilloscope provided, wherein one of the channel signals is selected simultaneously with the selection of the channel signal. 3. The plurality of sweep generators are provided in the same number as the plurality of channel signals, and can be selected in accordance with the selection of the channel signals. 3. The oscilloscope according to claim 2, wherein the oscilloscope is set to a corresponding arbitrary frequency.