Control circuit for a delayed sweep oscilloscope

• US 4,593,242 A
• Filed: 10/26/1983
• Issued: 06/03/1986
• Est. Priority Date: 11/19/1982
• Status: Expired due to Term

• Current Assignee: TechSearch LLC (Acacia Research Corporation)
• Original Assignee: Tektronix Incorporated (Fortive Corp.)
• Inventors: Law, William Q., Bristol, L. Rodney, Hillman, Alfred K. Jr.
• Primary Examiner(s): Levy, Stewart J.
• Assistant Examiner(s): Baker, Stephen M.
• Application Number:
  US06/545,560
• Time in Patent Office: 951 Days
• Field of Search: 324/121 R, 340/712, 340/753, 340/754, 340/802, 340/711, 340/713, 340/720, 340/749, 340/750, 340/798, 340/799
• US Class Current: 324/121.00R
• CPC Class Codes: G01R 13/20 Cathode-ray oscilloscopes

Abstract

In accordance with the present invention, a control circuit for operating a delayed sweep oscilloscope includes a reversible counter which may be selectively incremented or decremented to establish a number of trigger-circuit operating functions and modes, such as trigger source selection, coupling, level, and sweep mode. A plurality of light sources behind a plastic overlay laminated to the front panel indicate the various functions and modes.

Claims

1. A control circuit for an oscilloscope having a normal sweep circuit and a delayed sweep circuit, comprising:

electronic control means for selecting at least one of a trigger source and a coupling from a plurality of trigger sources and couplings;

indicator means for indicating the selected setting of said electronic control means;

switch means for enabling said electronic control means to control the setting for the normal sweep circuit and for the delayed sweep circuit; and

memory means coupled to said electronic control means and to said indicator means for storing the settings selected by said electronic control means.

2. A control circuit for an oscilloscope according to claim 1, wherein said indicator means comprises a plastic plate having indication characters printed thereon and a plurality of LEDs provided behind said plastic plate.

3. A control circuit for an oscilloscope acording to claim 1, wherein said LEDs emit different colors for different functions.

4. A control circuit for an oscilloscope according to claim 1, wherein said electronic control means comprises a reversible counter.