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Digital Oscilloscope: Waveform Stored in Memory and Shown on a CRT (Schumann, Nicolet, US 3,816,815, 1974)
An oscilloscope with a memory. After a trigger, an analog-to-digital converter measures the input at regular intervals and writes each reading into its own memory register, replacing the old one. The screen then shows the memory: each register's number sets the beam's height, its address sets the beam's place across. The last waveform can be held on the screen as long as you like.
Result: a digital storage oscilloscope with 4,096 points of 12 bits, refresh and hold modes and single-shot capture.
Source: R. W. Schumann (Nicolet), US 3,816,815 (1974). Unknown: sample rate, bandwidth, voltages and the parts used. Picture: the patent drawing.
전문가
Unknown
안내
1
1
Sample and convert the input
Sample and convert the input
Bring the analog input to an analog-to-digital converter, through a BNC socket. A sampling oscillator, divided by four by two flip-flops so the first reading comes soon after the sweep starts, fires a one-shot multivibrator that gives the converter its measure command. The converter holds each 12-bit result on its output lines and signals the end of each conversion. Ours: a BNC socket. Not given: the sample rate.
이 단계의 재료:
아날로그-디지털 변환기1 12-bit converter
클럭 발진기1 sampling oscillator
논리 IC 모음1 flip-flops, one-shots, gates
동축 커넥터 세트(BNC / SO-239)1 input socket필요한 도구:
인두
와이어 스트리퍼2
2
Store each reading in memory
Store each reading in memory
Wire an integrated-circuit memory of 4,096 registers, 12 bits each, that can be read without changing it. A 12-bit address counter picks the register. On each write command the register at the current address takes the last reading from the converter, and the counter steps on. When the sweep starts, a one-shot resets the counter to zero. When it reaches the last address, its last-address signal ends the sweep.
이 단계의 재료:
집적회로 메모리1 4,096 x 12-bit store필요한 도구:
인두와이어 스트리퍼3
3
Drive the CRT from the memory
Drive the CRT from the memory
Feed the addressed register's number to one digital-to-analog converter and the address to a second. Their outputs drive the vertical and horizontal deflection plates of a cathode-ray tube, so the beam always stands at the height of the stored reading and at the place of its address. Wire the sweep line to the tube's intensifier, to brighten the trace while a waveform is being taken.
이 단계의 재료:
디지털-아날로그 변환기2 vertical and horizontal
음극선관1 display tube필요한 도구:
인두와이어 스트리퍼4
4
Wire the trigger and the modes
Wire the trigger and the modes
A trigger input, usually from the leading edge of the input waveform, starts the sweep, once a measure flip-flop has armed it. Put a two-position mode switch on the face: MODE I and MODE II. Add a push button in the probe, a switch on the panel and an external initiate input; each goes through a flip-flop that removes contact bounce. Two more oscillators step the memory round to refresh the display between waveforms. Mount it all in a case with its supply. Ours: toggle switches, an aluminium case, a DC supply. Not given: the supply voltages.
이 단계의 재료:
클럭 발진기2 display sequencing oscillators
토글 스위치2 mode and panel switches
푸시 버튼1 probe switch
알루미늄 케이스1 case필요한 도구:
직류 전원 장치
탁상 드릴인두5
5
Capture and hold a waveform
Capture and hold a waveform
In MODE I, refresh: each new triggered waveform replaces the last on the screen. Press the probe or panel switch to hold: new waveforms are rejected and the last one stays on the screen. In MODE II the screen normally holds; on command, it takes the first waveform after the command, stores it and shows it steadily. Test it with a known signal.
필요한 도구:
함수 발생기재료
10- 1 12-bit converter플레이스홀더
- 2 display sequencing oscillators플레이스홀더
- 1 flip-flops, one-shots, gates플레이스홀더
- 1 input socket플레이스홀더
- 1 4,096 x 12-bit store플레이스홀더
- 2 vertical and horizontal플레이스홀더
- 1 display tube플레이스홀더
- 플레이스홀더
- 플레이스홀더
- 1 case플레이스홀더
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