Waveform measurement and display apparatus

• US 4,482,861 A
• Filed: 06/14/1982
• Issued: 11/13/1984
• Est. Priority Date: 06/14/1982
• Status: Expired due to Term

• Current Assignee: Tektronix Incorporated (Fortive Corp.)
• Original Assignee: Tektronix Incorporated (Fortive Corp.)
• Inventors: Andrews, Roland E., Jalovec, Lee J.
• Primary Examiner(s): Levy, Stewart J.
• Application Number:
  US06/388,008
• Time in Patent Office: 883 Days
• Field of Search: 324/77 A, 324/77 B, 324/77 C, 324/77 CS, 324/121 R
• US Class Current: 324/76.19
• CPC Class Codes: G01R 23/16 Spectrum analysis; Fourier analysis
• CPC Class Codes: G01R 23/18 with provision for recording frequency spectrum

Abstract

A waveform measurement and display apparatus comprises a pair of signal-processing channels in addition to a sweep generator arranged so as to provide both Y-T and X-Y display modes. A time marker generator system is provided to insert time markers into the same relative time positions of the respective Y-T and X-Y displays so as to precisely ascertain the time relationship between the two displays. Additionally, such time markers may be inserted into corresponding time positions for expanded and unexpanded waveforms in the Y-T display mode so as to precisely ascertain the relative time position therebetween.

Claims

1. A waveform measurement and display apparatus, comprising:

a first and second signal-processing channel, each including means for converting a respective electrical signal to digital representations thereof, digital memory means for storing said representations, and means for converting said representations to analog values for display;

means for selectively providing a Y-T display wherein at least one of said first and second signals is displayed along a time axis, and an X-Y display wherein said first signal is displayed along a first axis with respect to said second signal displayed along a second axis normal to said first axis; and

means for storing time marker data at predetermined address locations and producing time markers at corresponding time positions of said Y-T and X-Y displays.

2. A waveform measurement and display apparatus in accordance with claim 1 further comprising means for changing the timing of at least one of said signals so as to provide expanded and unexpanded displays thereof, wherein said time marker producing means also produces time markers at corresponding time positions of said expanded and unexpanded displays.

3. A waveform measurement and display apparatus in accordance with claim 1 wherein said means for producing time markers comprises means for selecting relative time positions of one or more signals and generating intensified dots corresponding thereto.