Tektronix, Inc.

Marshall Bond Borchert

David W Allen

A digital time base for producing sample clock pulses is provided with a control circuit to permit coherent switching from one sample rate to another. A plurality of predetermined sampling rates and number of samples to be acquired at each rate are stored in a memory. The predetermined sampling rates provide count moduli to a counter which divides the frequency of a base clock in accordance therewith to produce the actual sample clock pulses. A counter is provided to count the sample clock pulses, and when the desired number of pulses are generated, a next succeeding sampling rate and number of samples to be acquired are accessed from the memory. The rate switching to change the count modulus takes place between last sample clock pulse generated for a particular sampling rate and the next succeeding base clock pulse so that such switching is coherent.

Digital time base with coherent rate switching

An oscilloscope and a digital multimeter are combined in a single housing to provide a portable electronic measurement instrument wherein a substantial portion of circuitry is common to both measurement systems. A cathode-ray tube provides the display for both waveform and alpha-numeric information.

Electronic measuring instrument combining an oscilloscope and a digital

A multiple-line display signal generating apparatus is disclosed in which each of a plurality of lines is generated in a normally fixed raster format, wherein any one of the plurality of lines may be selected and positioned wiith respect to the other lines. Programmed current generators provide a fixed displacement current for each line, and a variable displacement current may be selected to replace any of the fixed values.

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Aloha, OR, United States of America

Marshall Bond Borchert