DE824474C - Procedure for the direct display of the clock progress - Google Patents

Description

Procedure for the direct display of the clock rate All previously known «-ordered Devices for controlling the rate of watches can be essentially three different Assign procedure: a) In the coincidence procedure, the strokes of the to be examined Clock (X o'clock) compared with the beats of a clock known gangs (_V o'clock). the The period between two beat coincidences is then a measure of the rate of the X-Uhr, with its time deviation from the true time is understood in a1 hour.

b) After a stroboscopic procedure, the balance spoke of the X watch illuminated with flashes of light derived from the beats of an N o'clock or vice versa. Wandering the stroboscopic image allows conclusions to be drawn about the progress of the X o'clock.

Another stroboscopic method works with a rotating disk known speed and is illuminated with flashes of light from the blows of the X clock are derived. There are also methods with a rotating strohoscope light source known. In each case, the apparent migration speed of the rotating Relative conclusions to the rate of the watch to be examined.

c) There are registering gait control devices of various designs became known, which 'all have in common, that the rate of the registered clock must be determined from the angle of inclination of the recorded curve.

All devices that work according to one of the methods described, has in common that the interesting value of the clock rate only takes a certain amount of time is available after the start of the measurement. The only attempt known so far Creating a directly displaying gear control device works according to the following principle: X o'clock and N o'clock switch the charging currents of two identical capacitors; first The stroke of the X clock switches on the charging current of the first capacitor, the first stroke the N clock switches it off, the third stroke of the X clock switches the charging current of the second capacitor a third stroke of the N o'clock switches it the end. If there is a rate difference between the two clocks, the distance is third strikes slightly different from that of the first strikes. That means one Charge difference of the two capacitors in a measuring arrangement for display is brought. The exact value can be read off in less than r sec. This method requires considerable equipment expense; there is also the disadvantage that gear fluctuations the IV clock, as they are unavoidable during a mainspring sequence, into the measurement result and falsify this.

In order to obtain a device with direct readability of the gear value, the avoids the disadvantages of the previously known methods, according to According to the invention, a harmonic harmonic of the impact frequency from the strong harmonic content Beat pulse of the X clock with an active or passive frequency standard known Frequency brought for comparison. The frequency comparison value obtained enables the rate determination of the X-Uh r.

In a possible embodiment of the invention with an active frequency standard, a grid-controlled gas discharge tube converts the X-o'clock beats picked up by a microphone and amplified in an amplifier into periodic voltage pulses and brings with it a harmonic of the voltage pulses n - f, freed from neighboring harmonics by filters a normal frequency f "for superposition. The normal frequency is equal to the nominal value n - f, of a watch with no rate deviation. The difference frequency obtained can be read off with a directly indicating frequency meter and is proportional to the rate of the X-watch. As an example, a standard frequency f" = 8640o Hz assumed. Then a difference frequency of r Hz means a rate deviation of r sec / day. However, the direction of the gear deviation cannot be recognized from the value of the difference frequency alone. Therefore, the normal frequency is selected a little above or below (learn setpoint of the multiplied impact frequency. For example, n # f, = 86 400 Hz, f "= 86,000 Hz, then a difference frequency of 400 Hz is formed, which corresponds to the rate deviation O. A difference frequency of 420 Hz would mean an instantaneous rate deviation of 20 sec / day. In general, the following applies: Here A = rate deviation / day in seconds, can be positive or negative; f, '= beat frequency of a correct clock in Hz. Another embodiment uses the method described above to obtain voltage pulses derived from the X clock. An electrical, piezo-electrical or electromechanical filter, the bandwidth of which must be smaller than twice the pulse frequency, has a resonance frequency that is so different from the ii-th harmonic of the beat frequency of a clock that is running correctly that the frequency n - f5. on the rising or falling: Is the filter resonance curve falling. The filter then supplies an alternating voltage, the level of which can be read on a voltage indicator after rectification. If the X clock has a rate deviation, the harmonic u - f changes with the beat frequency, and with it the voltage value obtained on the instrument.

To waste errors of the X clock in the embodiments described zti can determine, one can hit a sequence from your first. third, fifth etc. beat and then one from the second, fourth, sixth etc. beat the X clock for measurement. Measurement differences obtained indicate error errors in the Clock. The '' experience means a frequency division 2: i and can be combined with known Realize means.

Finally, the electrical rate values obtained can be calculated using a recorder. Register strips are then obtained; on which the rate of the examined watch can be read directly on a coordinate system. That Integral of the areas enclosed by the rate curve above bz "-. Below the abscissa is proportional to the time deviation of the X clock within the registered period.

Claims (3)

PATENT TANSPRCCIIE: r. Method for the electrical rate control of watches, characterized in that by multiplying the frequency of the beat frequency of a watch to be examined, a harmonic to the beat frequency becomes available, the frequency deviation of which from the known frequency of an active or passive frequency standard is a measure of the rate deviation of the examined watch. 2. The method according to claim t, characterized by the use of the even and odd numbers Clock beats in separate measurements to determine waste defects in a clockwork. 3. Registration device for performing the method according to claims r or 2, characterized by the recording of the measurement voltage obtained.