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Oscilloscope: Two-Channel Digital, with a Delay per Channel and a Common Delay (Anritsu, US 4,727,288, 1988)
A two-channel digital oscilloscope. Each channel has its own converter and delay circuit. One knob, with a main and a sub button, sets the delays. The sub button shifts only the sub channel's wave, so you can line it up against the main one. The main button shifts both waves together and keeps the gap between them.
Result: a 2-channel digital oscilloscope that can move both traces along the time base without losing their phase difference.
Source: K. Nakatsugawa et al. (Anritsu), US 4,727,288 (1988). Unknown: sample rate, bandwidth, memory size and the display. Picture: the patent drawing.
Experte
Unknown
Anweisungen
1
1
Convert the two channels
Convert the two channels
Bring the main channel and the sub channel each to its own analog-to-digital converter. Ours: BNC sockets. Not given: the sample rate, the bandwidth.
Materialien für diesen Schritt:
Analog-Digital-Wandler2 main and sub converters
Koaxialstecker-Satz (BNC / SO-239)1 input socketsBenötigte Werkzeuge:
Lötkolben
Abisolierzange2
2
Delay, store and display
Delay, store and display
Pass each channel's digital signal through its own delay circuit, whose delay is set by its own delay value setting device. Store both delayed signals in a wave memory and show them on the display. Ours: logic ICs for the delay circuits and setting devices, IC memory, and a CRT driven through D/A converters. Not given: how the delay circuits are built, the memory size, the display.
Materialien für diesen Schritt:
Logik-IC-Sortiment1 delay circuits and setting devices
Halbleiterspeicher1 wave memory
Digital-Analog-Umsetzer2 display drive
Kathodenstrahlröhre1 displayBenötigte Werkzeuge:
LötkolbenAbisolierzange3
3
Build the delay panel and processor
Build the delay panel and processor
Make a delay operation panel with a main switch, a sub switch and one dial, with an encoder on the dial so each turn is read as a change in its output. Connect the panel to a microprocessor with a common memory that holds the sub channel's delay S in one area and the main channel's delay M in another. Mount it all in a case with its supply. Ours: push buttons, an aluminium case, a DC supply.
Materialien für diesen Schritt:
Drucktaster2 main and sub switches
Drehgeber1 delay dial
Mikroprozessor1 command devicesHalbleiterspeicher1 common memory
Aluminiumgehäuse1 caseBenötigte Werkzeuge:
Gleichstromnetzgerät
StandbohrmaschineLötkolben4
4
Program the two commands
Program the two commands
When the dial turns, read the encoder change e and which switch is held. Sub switch: add e to S, set the sum in the sub channel's setting device and store it back as the new S. Main switch: add e to both M and S, set M + e in the main channel's device and S + e in the sub channel's, and store both back. The main command so moves both channels by the same amount and keeps their relative delay.
Benötigte Werkzeuge:
Lötkolben5
5
Compare two waves
Compare two waves
Feed two signals in. Hold the sub switch and turn the dial to slide the sub channel's wave against the main one. Then hold the main switch and turn the dial: both waves move along the time base together, with the phase difference between them unchanged. Test it with a known signal.
Benötigte Werkzeuge:
FunktionsgeneratorMaterialien
10- 2 main and sub convertersPlatzhalter
- 1 input socketsPlatzhalter
- 1 delay circuits and setting devicesPlatzhalter
- 1 common memoryPlatzhalter
- 2 display drivePlatzhalter
- 1 displayPlatzhalter
- Platzhalter
- Platzhalter
- 1 command devicesPlatzhalter
- 1 casePlatzhalter
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