JPS6157860A - Waveform observation device - Google Patents

Abstract

PURPOSE:To display overscaled in a display screen by converting an input waveform into digital waveform data, and processing the waveform data when a displayed waveform is too large to display on the display screen and displaying the excess of the waveform part at a specific position in the display screen. CONSTITUTION:The input waveform inputted from an input terminal 1 is passed through an amplifying circuit 2 and an AD converting circuit 3 and written in a memory circuit 4 under the control of a writing circuit 5, and the waveform is read out by a readout circuit 6, processed by an overscale circuit 7, and displayed on a liquid-crystal display element 8. When some or all of data 9 before overscale (OS) processing among waveform data values from a minimum value to a value Dd are between Da and Db or Dc and Dd, the waveform extends to outside the display screen 11 and an OS state is entered. The data 9 is converted to Db when between Da-Db or to Dc when betweh Dc-Dd, and the OS waveform is displayed at the lower end 12 or upper end 13 of the display screen.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to an improvement in the display of a waveform observation device.

Conventional technology Conventional oscilloscopes have a sensitivity selector switch, a sensitivity fine adjustment knob, and a vertical position fine adjustment knob as operation parts for controlling the vertical axis, and by operating these, a waveform can be displayed on the display screen of the ORT. However, when the waveform to be displayed extends beyond the display surface (hereinafter referred to as overscale) due to the settings of these operating sections, conventional oscilloscopes display the overscaled portion of the waveform. has a structure that cannot be displayed.

Problems to be Solved by the Invention In a conventional oscilloscope, when all displayed waveforms are overscaled, the waveforms are not displayed at all on the display surface of the OI (T). Poor adjustment ii) It is difficult to determine whether there is a malfunction in the device, and it takes a long time to properly display a waveform.

Means for Solving the Problem The present invention solves the above problem by converting an input waveform into waveform data, which is a digital signal, and applying appropriate data processing to the waveform data when overscaling occurs. Accordingly, the overscaled waveform portion is displayed at a predetermined position within the display surface.

Effect: By having the above-mentioned features, the present invention can clearly display information regarding overscaling on the display screen.
In particular, even when the entire waveform is overscaled, the location of the waveform can be easily known.

Example Embodiments of the present invention will be described with reference to the drawings.

First, the present invention will be explained in detail with reference to FIG.

An input waveform input from an input terminal 1 is amplified by an amplifier circuit 2, converted to waveform data as a digital signal by an AD conversion circuit 3, and written into a memory circuit 4. The operations up to this point are controlled by the write circuit 5. Once stored, the waveform data is read out by a readout circuit 6, and further subjected to overscale data processing by an overscale circuit 7. The interlocking crystal display element 8 displays a waveform on the liquid crystal display surface 11 (FIG. 2) based on this waveform data.

Next, a data processing method for overscaling of this waveform observation device will be explained with reference to FIG.

The pre-overscale processing data 9 and the post-overscale processing data 10 are waveform data before and after data processing for overscaling, respectively, and particularly I) a.
, Db, Dc, and Dd are, in order, the minimum value of the waveform data, the value of the waveform data corresponding to the lower end of the display surface, the value of the waveform data corresponding to the upper end of the display surface, and the maximum value of the waveform data. Alright, all data 9 before overscaling is Db~D
If the value is between c, the waveform will fit within the display surface 11. However, if part or all of the pre-overscale data 9 takes a value between Da-Dbi or 1) c-Dd, the waveform will extend beyond the display screen 11 and will be in an overscale state. turn into. Therefore, in the overscale circuit 7, when the pre-overscale processing data 9 takes a value between I) Da and Db, the value is converted to Db, and when it takes a value between 1i) Dc and Dd, the value is converted to Db. Convert the value to Dc, ii) otherwise take the value as it is, and convert the overscaled data lO
By doing so, the overscaled waveform portion is displayed at the lower end 12 of the display screen or at the top edge 13 of the display surface, and the occurrence of overscaling and its direction can be known.

Note that the arrangement of the overscaler circuit 7 is 1. In addition to the example shown in FIG. A I) It may be between the conversion circuit 3 and the memory circuit 4 or between the memory circuit 4 and the readout circuit 6.

Furthermore, by setting the minimum value 1) a and the maximum value red of the waveform data that can be output by the AD conversion circuit 3 to match the values nb and Dc of the waveform data corresponding to the lower and upper ends of the display screen, respectively, A similar function can also be achieved without using the overscale circuit 7.

Effects of the Invention As described above, the present invention applies appropriate data processing to waveform data and displays the overscaled waveform portion at the bottom or top of the display screen, thereby preventing the occurrence of overscaling and its direction. Easy identification [-1 Improves the operability of waveform observation equipment]

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a circuit showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the relationship between internal signals and display in FIG. 1.

Claims (1)

[Claims] Converts the input waveform to waveform data, which is a digital signal, and when the waveform to be displayed extends beyond the display surface, data processing is applied to the waveform data to move the waveform portion that extends beyond the display surface to a predetermined position within the display surface. A waveform observation device characterized by displaying.