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Microcoded Sampling Oscilloscope

IP.com Disclosure Number: IPCOM000081832D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Borchsenius, E: AUTHOR [+3]

Abstract

A sampling oscilloscope built into an electronic data processing machine offers significant advantages for diagnosis and maintenance. Flexibility is enhanced by placing the oscilloscope under control of a microprogram.

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Microcoded Sampling Oscilloscope

A sampling oscilloscope built into an electronic data processing machine offers significant advantages for diagnosis and maintenance. Flexibility is enhanced by placing the oscilloscope under control of a microprogram.

As shown in Fig. 1, the waveform being measured is gated through AND 1 and OR 2 to a digital sampler 3. When triggered by a sweep signal (which could be derived, for example, from the CPU clock), the sampler will place the digital value of the waveform voltage into register 4 from which it can be written into storage 5. Storage may be addressed by a sweep counter 6 which is incremented by each sweep signal.

Sweep counter 6 can count up to N sweep signals, after which it will recycle back to zero. Likewise, N locations in storage 5 are set aside for storing successive voltage samples. When storage 5 becomes full, the microprogram can cause its contents to be moved to another storage area from which they can be logged (for example, onto a disk) for future reference, or they can be displayed or printed on an output device. Alternatively, the values written into storage 5 could be compared by the reference, or they can be displayed or printed on an output device. Alternatively, the values written into storage 5 could be compared by the microprogram to a known set of voltages for diagnostic and maintenance purposes. In order that the CPU clock may be checked, clock pulses can be gated through AND 7 to the digital sampler 3. A serializer which is part of the system can be made available to the digital sampler 3 through AND 8. A desired serializer address would be entered (for example, by keys on...