Method of operating an oscilloscope

• US 6,947,043 B1
• Filed: 03/27/2000
• Issued: 09/20/2005
• Est. Priority Date: 03/27/2000
• Status: Expired due to Fees

• Current Assignee: Tektronix Incorporated (Fortive Corp.)
• Original Assignee: Tektronix Incorporated (Fortive Corp.)
• Inventors: Davidson, Scott A., Klingman, Kayla R.
• Primary Examiner(s): Jankus, Almis R.
• Assistant Examiner(s): CHUNG, DANIEL J
• Application Number:
  US09/536,205
• Time in Patent Office: 2,003 Days
• Field of Search: 345/324, 345/440, 345/440.1, 345/691, 345/208, 345/53, 345/94, 702/66, 702 67- 74
• US Class Current: 345/440.1
• CPC Class Codes: G01R 13/0236 for presentation of more than one variable
• CPC Class Codes: G01R 13/28 Circuits for simultaneous or sequential presentation of more than one variable
• CPC Class Codes: G01R 13/345 for displaying sampled signals by using digital processors by intermediate A.D. and D.A. convertors (control circuits for CRT indicators)

Abstract

An oscilloscope that is capable of displaying simultaneously multiple waveforms representing time evolution of a signal during respective acquisition intervals acquires waveform data using a first set of acquisition parameters and generates a display based on that waveform data. If the display includes a waveform that is visually distinct from other displayed waveforms, the user selects a feature that distinguishes the visually distinct waveform from other displayed waveforms. The oscilloscope automatically derives updated acquisition parameters that discriminate between the selected feature and other features of the displayed waveforms. The oscilloscope then acquires waveform data using the updated acquisition parameters and generates a display based on that waveform data.

Claims

1. A method of operating an oscilloscope that is capable of displaying simultaneously multiple waveforms representing time evolution of a signal during respective acquisition intervals, comprising:

(a) acquiring waveform data using a first set of acquisition parameters,

(b) generating a display based on the waveform data acquired in step (a), in the event that the display generated in step (b) includes a waveform that is visually distinct from other displayed waveforms,

(c) selecting a feature within the displayed waveforms that distinguishes the visually distinct waveform from other displayed waveforms,

(d) automatically deriving a second set of acquisition parameters that discriminate between the selected feature and other features of the displayed waveforms,

(e) acquiring waveform data using the second set of acquisition parameters derived in step (d), and

(f) generating a display based on the waveform data acquired in step (e).

2. A method according to claim 1, wherein step (c) includes graphically defining a template that specifies the selected feature and step (d) includes employing information regarding the template to derive said second set of acquisition parameters.

3. A method according to claim 1, wherein the oscilloscope has multiple trigger modes, step (c) includes graphically defining a template that specifies the selected feature and step (d) includes employing information regarding the template to select a trigger mode for preferentially acquiring waveforms that include the selected feature.

4. A method according to claim 3, wherein the template is a scalable rectangular box and step (c) includes positioning and sizing the box so that it contains the selected feature.

5. A method according to claim 2, wherein the oscilloscope has a display screen on which the waveforms are displayed and the template is a sketch generated on the display screen.

6. An oscilloscope that is capable of displaying simultaneously multiple waveforms representing time evolution of a signal during respective acquisition intervals, said oscilloscope comprising:

an acquisition means for acquiring waveform data using a first set of acquisition parameters,

a display means for generating a display based on the waveform data acquired by the acquisition means,

a user control means that can be used in the event that the display generated by the display means includes a waveform that is visually distinct from other displayed waveforms to select a feature within the displayed waveforms that distinguishes the visually distinct waveform from other displayed waveforms, and

an oscilloscope control means for automatically deriving a second set of acquisition parameters that discriminate between the selected feature and other features of the displayed waveforms, and for supplying the second set of acquisition parameters to the acquisition means, whereby the acquisition means can acquire waveform data using the second set of acquisition parameters and the display means can generate a display based on the waveform data acquired by the acquisition means using the second set of acquisition parameters.