Automatic period and frequency measurements

Details Automatic period and frequency measurements Automatic period and frequency measurements

1989-06-19

1990-04-10

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

Electrical or electromechanical

368117, 324 78R, G04F 800, G01R 2316

Patent

active

049166778

ABSTRACT:
An automatic period and frequency measurement feature for an analog oscilloscope uses a single sweep signal and a delay trigger to detect edges. The sweep rate for the sweep signal is set to the highest rate that provides at least one cycle of the input signal on a display. By varying a programmable level that is compared with the sweep signal, a first event after the start of the sweep is searched for. Once a first event is located, then a second event is searched for in the same manner, reducing the sweep rate if necessary to provide the second event on the display. From the programmable levels corresponding to the first and second events a period and frequency are computed and displayed.

REFERENCES:
patent: 3436756 (1969-04-01), Myers et al.
patent: 3891920 (1975-06-01), Williams
patent: 4238727 (1980-12-01), Madni
patent: 4350953 (1982-06-01), Best et al.
patent: 4527907 (1985-07-01), Chan
patent: 4841497 (1989-06-01), Bateman et al.
patent: 4855968 (1989-08-01), Shank
patent: 4868465 (1989-09-01), Stevens et al.

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