DE1028228B - Procedure for checking switching operations - Google Patents

Description

Method for checking switching operations The invention relates to refer to a method and a circuit arrangement for checking switching operations when forwarding work or when supplying energy, especially when it is discontinuous En.ergi) ezufuhT, e.g. B. in contact bouncing of switches.

With different switching operations it is very important to know whether it is a work to be managed by the weather, an added energy, a tension or a Go current continuously or d'iskaatinuously over the switching point. A discontinuous one Forwarding takes place, for example, in the event of contact bruises.

Even if this happens in various cases after a certain period of time the work required on the consumer can still be effective, so it is often the time delay caused by the discontinuous forwarding of the actual switching process is not acceptable, not to mention the stresses and strains the switching points. When studying the inertia in circuits involving a consumer included, the z. B. responds to the work done, are two problems of Interest.

On the one hand the recognizability of the energy supply and on the other hand the transfer of work to the consumer, since the supply is continuous or discontinuous can. With the continuous transfer of work to the consumer, the Response ohm, which is decisive for the way the consumer works, the fastest achieved.

But as soon as the work forwarding becomes discontinuous, ch i, st, accordingly, as a result of the pauses occurring in the loading, a longer one Time needed. Such processes can advantageously be carried out with the aid of a counting device be examined, the observer the encountered discontinuity of the feed can determine.

Di, known production of periodic switching operations i. st not applicable in all cases. One-off processes that run in a short time with a Observing and evaluating oscillographs means a lot of effort, namely either synchronized special cameras, whose images also only after are available for a longer period of time, or afterglow umbrellas that are used for quick one-off processes always show blurring, so there. ß for example the statement is unsafe for a number of bruises.

In the case of switching operations that cannot be repeated with the same object, such as B. in the case of the switched object destructive mitia or thermal flash ignitions, is also now a device for checking the tripping times by a repeated Usable replica is particularly advantageous because a contact is made with regard to your secure and timely Lich correct functionality examined in the simplest way can be. the defects in the contacts and Schaltverbimdtengen can be remedied without the object for which the switching process is intended for each Destroy or claim an investigation. These disadvantages are discussed in the introduction The mentioned method is eliminated by the fact that the number of interruptions and the time of the total switching process under operating conditions or with supply an auxiliary power is measured by means of electronic counters and the measured values directly are displayed.

With the method according to the invention it is possible that any interruption is displayed during feed and forwarding. From the number of interruptions the observer can obtain information about the properties of the switching point, while the test result immediately after the test process for any length of time Time ablesbawr is available.

Checking is considered to be the preferred field of application of the invention of synchronous flash camera contacts, especially so-called M-contacts for the Triggering of thermal flashes mentioned. Here it is very important to make contact initiated ignition process to run within a certain time, so the greatest intensity of the heat flash even within the hold-open position of Closure is @ contact bruises would be z. B. Occurrence for time delays that would make the camera unusable for this recording technique, because the intensity peak may not occur until or after the closing of the Camera misalignment occurs.

In addition to this area of application, there would also be relay-controlled Point out contact, in which the invention can also be used to advantage can.

The invention is described in more detail using the drawing, with 1 shows a diagram to explain the processes involved in making contact, and FIG. 2 a circuit diagram of the new Vorric. attention shows.

Curves 1 and 2 represent the transfer of work A as a function from the time t, namely the curve 1 with a single firm contact and the Curve 2 for bruises on the test item. With continuous forwarding, i. H. at immediate firm contact, the threshold, which is indicated by the reference line 3, after the time tk is reached, which is used as a reference time for a draw of the process impeccable contact. can apply. In the case of discontinuous forwarding, i. H. in the case of contact bruises, the release process only takes place after the time td, since the work required to trigger the switching process, for example flash ignition must only be collected in a slower integrating process.

For a better illustration there are the energy supply diagrams, d. H. the supplied energy E is recorded as a function of time t, at which curve 1 'with a single contact and curve 2' for example in the case of bruises. Provided the reference time for a secure contact previously determined or determined. is can from exceeding this Time immediately to be closed on defects in contact, the z. B. to the belated Flash triggering would lead to M contacts on cameras.

The Prüfvorridhtung itself can according to Fig. 2 from a voltage source 4, a capacitor 5 and a resistor 6, with another changeable Longitudinal resistor 7 is provided.

The contact 8 to be checked is placed in the line 8 '. The resistance 7 can be used to determine the RC value of the posture of the inertia of the test object be adjusted.

In addition, the test device includes a pulse star stage 10, a Tilt level 9 with t r. adjustable cathode resistor 9 ', one as a time interval generator serving pulse generator 11 and a pulse gate 17 and a counter 12, 13. When Closing the contact 8, the switching process is initiated. The first flank of the The ignition process is fed to the pulse control stage 10 via the connecting line 14.

Under the influence of the first flank of the switching process arises La the control stage 10 a control pulse that opens the Pulse 17 so that the The pulses generated in the pulse generator 11 reach the counter 12, 13. Under the The effect of the holding process occurs on the capacitor 5, according to the selected Inertia at the control grid of the flip-flop 9, a voltage that is generated when the the previously set response initiates the tipping process. When achieved This initial voltage of the flip-flop 9 produces a control signal at the output of the flip-flop, that via line 16 that Impulstor 17 blocks and thus interrupts the counting process.

The RC element 5, 6 can optionally be designed to be changeable, in order to be able to better adapt the time scale of the tripping time. The tension setting the electron tube can be done very precisely, so that a simulation of the trigger voltage or the ignition voltage can be reproduced at any time without the actually switched Object such as the flash lamp indicated in the figure or an ignition mine a check of the contact is required.

In addition, the bouncing process can be carried out via line 14 of the pulse control stage 10 are fed, with the counting pulses coming from the flanks or turning points the discontinuous supply or forwarding processes (see. Fig. 1, Kruve 2) derived by differentiation, arising over the lei; tion 15 the counter 12, 13 are fed.

This will reduce the number of bruises or broken contacts established. In this case, one from the pulse control stage can also be sent to the test object removable auxiliary voltage. The examinee can also take his actual operating conditions are examined. In both cases there are buyers placed on the line 8 ', which is connected to the pulse control stage 10 via cables could be. The start impulse for starting or opening the Impulstores 17 of the oscillator 11 or the stop pulse for the termination of the time measurement be fed to the pulse control stage 10 or the oscillator 11 via pickups.

Claims (5)

PATENT CLAIMS: 1. Method for checking switching operations when forwarding work or when supplying energy, especially when it is discontinuous Energy supply, e.g. B. in contact bruises from. Switches, characterized that the number of interruptions and the time of the total switching process below Operating conditions or when an auxiliary energy is supplied by means of electronic counters measured and the measured values are displayed directly. 2. The method according to claim 1, characterized in that when arising the switching connection initiates the counting process and when the set The compensation voltage point of a breakover voltage level measures the time the energy supply is stopped. 3. The method according to claim l, characterized in that from the Flanks of the fluctuation curves that occur with discontinuous forwarding or supply Counting pulses for the number of interruptions can be derived. 4. Circuit arrangement for performing the method according to claim 1, characterized in that an integration element in the lattice circle on one certain grid bias adjustable tilting stage is provided and this Occurring integration process of the work forwarding bi, to compensate for the Grid bias measured by means of counting pulses with constant spacing as triggering time or is displayed. 5. Sohaltungsanordnung for performing the method according to claim l or one of the following, characterized in that the integration element in terms of its Zett constant can be changed and with continuous energy supply resp. Work forwarding, d. H. one-time permanent contact, measured release time serves as a reference value. Documents considered: Patent No. 9,631 des Office for Invention; nd patent system in the Soviet occupation zone of Germany ; U.S. Patent Nos. 2,212,634, 2,244,338.