Abstract: A system for the welding of motor-vehicle bodies comprises a conveying line, for carrying the motor-vehicle bodies to be welded through a welding station, and a plurality of pairs of side gates mobile on guide means, the gates of each pair being adapted to the configuration of a corresponding type of body to be welded. According to the invention there is provided a plurality of tractors, which are independent with respect to said side gates, each tractor being selectively coupleable in an automatic way to side gates of different pairs, for the purposes of displacement of the latter between an active position, close to the welding station, and at least one parking position, remote from the welding station.

Abstract: A system for the welding of motor-vehicle bodies comprises a conveying line, for carrying the motor-vehicle bodies to be welded through a welding station, and a plurality of pairs of side gates mobile on guide means, the gates of each pair being adapted to the configuration of a corresponding type of body to be welded. According to the invention there is provided a plurality of tractors, which are independent with respect to said side gates, each tractor being selectively coupleable in an automatic way to side gates of different pairs, for the purposes of displacement of the latter between an active position, close to the welding station, and at least one parking position, remote from the welding station.

Abstract: Time jitter distortion of data pulses is measured by a test set which recovers a median leading and a median trailing edge from the data pulses, defines a point of time reference at the midpoint of the median leading and trailing edges, generates a digital representation of one-half the median pulse interval (i.e., the interval from the reference time to the median pulse edge) and digital representations of the intervals from the reference time to the data pulse edges, and calculates the difference between each data pulse digital representation and the half median pulse digital representation to obtain the distortion of each data pulse. The test set displays digital representations of selected ones of the calculated differences in accordance with a counting algorithm of the number of times that each of the various differences are calculated.