Patent US3787618A successfully refreshed from Google Patents.
US3787618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube display device including test probe adapter
Assignee: AT&T Teletype Corp
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Filing: 1972-10-24
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Granted: 1974-01-22
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Expires: 1992-10-24
Abstract
Abstract A system for using the video amplifier and the X and Y axis raster scanning circuits of a CRT display device in conjunction with a measuring probe to form a Z-axis oscilloscope observing the output of intermediate signals in the CRT display logic circuit in order to obviate a separate service-man-supplied oscilloscope.
Inventors
- 👤 H Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:07
CPC Classifications
G; G01; G01R; G01R35/00; G01R35/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A method of displaying the internal operation of a cathoderay-tube display device having a normal sweep time base, a video amplifier and control circuits by using a test probe, without the use of an external cathode-ray-tube, which comprises: disconnecting the video amplifier from the control circuits; connecting the test probe to the video amplifier of the cathoderay-tube display device; and sampling the internal signals of the control circuits of the cathode-ray-tube device with the test probe, thereby displaying the internal signals of the control circuit on the cathode-raytube display screen using the normal sweep time base of the cathode-ray-tube display device.
Claim 2
Independent Claim
101 words
A method of displaying the internal operation of a cathoderay-tube display device having a normal sweep time base, a video amplifier and control circuits by using a test probe, without the use of an external cathode-ray-tube, which comprises: disconnecting the video amplifier from the control circuits; connecting the test probe to the video amplifier of the cathoderay-tube display device; and sampling the internal signals of the control circuits of the cathode-ray-tube device with the test probe, thereby displaying the internal signals of the control circuit on the cathode-raytube display screen using the normal sweep time base of the cathode-ray-tube display device.
Claim 3
Dependent Claim
156 words
A self-testing apparatus for a cathode-ray-tube display device having means for producing a time base for the display device, deflection circuitry for controlling the deflection of the cathode-ray-beam, means for amplifying the video signals for the cathode-ray-tube and means responsive to the timing means and to input data signals or delivering these data signals to the video amplifying means for display on the screen of the cathode-ray-tube, wherein the improvement comprises: a plurality of accessible test points in the control circuitry, said test points connected to the internal control circuitry and carrying timing, control, and data signals present in the control circuitry; manually operable test probe adapted for use with the test points of the control circuitry for monitoring the signals present thereon without altering the nature of the signal; and means for disconnecting the video amplifying means from the control circuitry and for connecting the video amplifying means to the output of the signal probe.
Claim 4
Dependent Claim
156 words
A self-testing apparatus for a cathode-ray-tube display device having means for producing a time base for the display device, deflection circuitry for controlling the deflection of the cathode-ray-beam, means for amplifying the video signals for the cathode-ray-tube and means responsive to the timing means and to input data signals or delivering these data signals to the video amplifying means for display on the screen of the cathode-ray-tube, wherein the improvement comprises: a plurality of accessible test points in the control circuitry, said test points connected to the internal control circuitry and carrying timing, control, and data signals present in the control circuitry; manually operable test probe adapted for use with the test points of the control circuitry for monitoring the signals present thereon without altering the nature of the signal; and means for disconnecting the video amplifying means from the control circuitry and for connecting the video amplifying means to the output of the signal probe.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |