JPH0426372U

JPH0426372U -

Info

Publication number: JPH0426372U
Application number: JP6816590U
Authority: JP
Priority date: 1990-06-27
Filing date: 1990-06-27
Publication date: 1992-03-02

Description

[Brief explanation of drawings]

第１図は本考案に係るデジタルオシロスコープ
における時間計測機能部分の一実施例を示す構成
図、第２図はサンプリング波形を示す図、第３図
は従来のデジタルオシロスコープの時間計測機能
部分の一例を示す構成図である。１……ＡＤ変換器、２……メモリ、３……比較
器、４……カウンタ、５……演算回路、６……ク
ロツク発生器、７……補間回路。 Fig. 1 is a configuration diagram showing an example of the time measurement function part of a digital oscilloscope according to the present invention, Fig. 2 is a diagram showing sampling waveforms, and Fig. 3 is an example of the time measurement function part of a conventional digital oscilloscope. FIG. 1... AD converter, 2... Memory, 3... Comparator, 4... Counter, 5... Arithmetic circuit, 6... Clock generator, 7... Interpolation circuit.

Claims

[Claims for Utility Model Registration] Analog signals are sampled in synchronization with a clock, converted into digital data, and stored in memory.
After that, in addition to the normal function of sequentially reading out the waveform data stored in the memory and displaying the waveform on a display device such as a CRT display, the waveform data sequentially read out from the memory is compared with a threshold value and the comparison results are binarized. a comparator that outputs a signal; a counter that counts the clock during the period during which the analog input signal crosses the threshold; and a period during which the analog input signal crosses the threshold based on the count value of this counter and the period of the clock. In a digital oscilloscope, the digital oscilloscope is composed of an arithmetic circuit that calculates the time width of the analog input signal and has a function of measuring the time width of the period in which the analog input signal crosses the threshold value. an interpolation circuit that interpolates by a specified function and calculates the time difference from the time of the sampling point to the time when the analog input signal crosses the threshold; From the obtained time difference, the time width of the period in which the analog input signal crosses the threshold is calculated by calculation, and the period width can be measured with a resolution higher than the clock period. Digital oscilloscope with time measurement function.