Triggered display for telephone line characteristic measuring in

Details Triggered display for telephone line characteristic measuring in Triggered display for telephone line characteristic measuring in

1975-09-03

1976-10-12

Olms, Douglas W.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324121R, H04B 346

Patent

active

039859800

ABSTRACT:
There is disclosed an improved display, of the type described in my co-pending application Ser. No. 455,197 now Pat. No. 3,906,173 issued on Sept. 16, 1975, for use with a telephone line characteristic measuring instrument. A signal representing the instantaneous in-phase component of the total disturbance on a received test tone is applied to one set of deflection plates of a storage oscilloscope, and a signal representing the instantaneous quadrature component of the total disturbance on the received test tone is applied to the orthogonal deflection plates. The display is formed only in response to the detection of a disturbance. By detecting a disturbance and maintaining a display of it, the display can be studied at length.

REFERENCES:
patent: 3115605 (1963-12-01), Coulter
patent: 3201641 (1965-08-01), Thorne
patent: 3551733 (1970-12-01), Johnson
patent: 3814868 (1974-06-01), Bradley
patent: 3836735 (1974-09-01), Bradley
patent: 3836851 (1974-09-01), Schumann

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