An improved sweep circuit for an oscilloscope or the like has an adjustably delayed sweep which is time shared to display separate recurring events of interest alternately to provide an apparently simultaneous display of the events. The adjustable delay between sweeps may be directly indicated as a time interval between sweeps.

The fabrication of a printed circuit board (26) usually includes the step of testing the board with a testing machine (24) to verify operability. The testing machine accomplishes such testing by transmitting test signals to the board via a transmission line (36) and then analyzing each response signals returned from the board in response to the test signals. To reduce the incidence of error, the testing machine (24) is compensated for the propagation delay of the line (12) which is measured by l...

A time interval counter permits the time interval between a first signal and one of a series of timing signals to be measured to less than .+-.2 nanoseconds without using microwaves and high power-consuming devices. The time interval counter uses a first passive delay time operated from the first signal, which occurs at an unknown interval from the timing signals, to produce a plurality of binary outputs spaced from each other by known equal time intervals that are substantially less than the in...

The fabrication of a printed circuit board (26) usually includes the step of testing the board with a testing machine (24) to verify operability. The testing machine accomplishes such testing by transmitting test signals to the board via a transmission line (36) and then analyzing each response signals returned from the board in response to the test signals. To reduce the incidence of error, the testing machine (24) is compensated for the propagation delay of the line (12) which is measured by l...

An indicia display unit comprises an inner wheel bearing a number of indicia, the number being represented by an integer X, and an outer wheel bearing a number of indicia equal to nX where n is an integer. The outer wheel is also formed with a display window. The inner wheel is nestingly fitted within the outer wheel, and its indicia position is aligned with an indicia position on the outer wheel. The inner wheel is adapted to be driven for one cycle which includes (n + 1) revolutions. During th...

A balance-cock-and-regulator assembly for a timepiece movement comprising a balance cock with an opening for a bearing, an additional opening peripherally spaced from the bearing opening for rotatably mounting a regulator which cooperates with a hairspring.

A balance spring support which is blanked out or stamped to a shape such as to embrace at least two faces of the outer end of the balance spring. A bond is used for securing said outer end of the balance spring to at least one of said faces. The support is detachable from the rest of the movement.

A mechanical watch movement of the type wherein a balance-cock supports a balance arranged to pivot in bearings about a fixed axis, and a balance-spring is fixed at its inner end to the balance and at its outer end to a bent arm of a thin, blanked plate constituting a support member detachable from the remainder of the movement.

A horological instrument includes an oscillator assembly and a hairspring. The hairspring is fastened at one end to the oscillator assembly and is anchored to the frame or bridge at its opposite end. A regulator includes two spaced apart arms having slots which surround the hairspring. The regulator is designed to impart a positive isochronism characteristic to the hairspring in order to permit synchronizing of the balance wheel motor. The frequency of balance oscillation is thus made dependent ...

A frequency divider circuit having master-slave type flip-flop binary circuits formed from complementary insulated gate field effect transistors. Presetting means incorporated in one of the master or slave flip-flop circuits, the clock signal for the flip-flop circuit not having said presetting means is adapted so that said flip-flop circuit is subordinate to the flip-flop circuit incorporating the presetting means during the presetting operation.