SU779927A1 - Device for checking electric parameters of quartz resonators - Google Patents

Description

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The invention relates to the field of instrumentation and to be used for automatic tolerance control and sorting of quartz resonators, for example, for an electronic clock, depending on the value of the quality factor and the equivalent dynamic resistance.

The known devices are for automatic control of parameters of quartz resonators made using an exciter, a capacitive quadrupole indicator, a frequency meter indicator, a code converter and an actuator, automatic frequency control and program setting units, as well as a threshold selector and a control signal generator 1.

However, the measurement time is large, and the measurement accuracy does not always satisfy the need for production. The speed of such devices is constrained by both the time required to excite and attenuate the test resonator, and the time required to process the received measurement information,

A device is known that is additionally equipped with a faabi detector connected in parallel to the exciter, the output of which is connected to the reactivity compensator in the measuring quadrupole, and the BTOpbJM -threshold selector connected between the inputs of the automatic frequency tuning unit and the frequency meter, and the output of one of the control elements the driver of the connection & y with the code converter; the time switch with the code sensor / -a connection point 15 bg. automatic frequency adjustment and co Mensator - with one of the inputs of phase discriminator 2.

However, this device does not meet 2.0 of the requirements for the production of resonators due to low productivity, which is limited by the following factors: the final time of excitation of the quartz resonator, the presence of manual calibration, is necessary. DIMA to preserve the metrological characteristics of the device and carried out regularly in the measurement process, the lack of automation elements that allow mechanical screening and sorting of the tested resonators.

The aim of the invention is to increase productivity with automatic control and preserve the metrological characteristics of the device during the measurement process.

The goal is achieved by the fact that the device for monitoring the electrical parameters of quartz resonators, comprising a block, a resonator control block, a detector, an information processing block, a switch, a pulse selector and a display block, are equipped with an automatic calibration block and a clock switch connected in series, as well as three amplitude selectors , three frequency dividers and a mechanical distributor, with one of the clock inputs of the clock switch being central with the control unit, the other with the output the detector and the output - with the inputs of three amplitude selectors, the output of one of which is connected to the control unit, the output of the other with the control unit and one of the inputs of the pulse selector, and the third output - with another input of the pulse selector, the output of which is connected through serially connected frequency dividers with the switch, the outputs of the first and. the second frequency dividers are connected to other switches of the switch, and the output of the HliH control unit is connected to the input of the mechanical distributor,

 The drawing shows a block diagram of the device.

The device contains a resonator excitation unit consisting of an auto-oscillator 1 connected in series through an electronic switch.

2k measuring quadrupole

3c test resonator 4 and amplifier 5, Signal amplifier 5 goes to detector b and driver v pulses 7, as well as autogeneration 1. Detector b is connected to a clock switch 8, the second input of which is connected to the automatic calibration unit 9, the output of clock switch 8 is connected to the inputs of three amplitude selectors 10, 11, 12,

Amplitude selectors 10 and 12 are connected to the control unit 13, Amplitude selectors 11, 12 and the pulse shaper 7 are connected to the pulse selector 14, to the output of which are connected in series dividers. Frequencies 15, 16, 17, each of them is connected to the switch 18. Processing unit the information contains a comparison register 19, a storage register 20, a census unit 21, a coincidence unit 22, an operating unit 13 connected to an indication unit 53, with a mechanical distributor 24, as well as with a hot switch 8,

with the automatic calibration block 9, with the switch 18 and with the census block 21,

The device works as follows.

According to the signal from the control unit 13, the test resonator 4 is excited at the resonance frequency in the block containing the self-oscillator 1, the electronic switch 2, the measuring quadrupole 3 and the amplifier 5, the excitation voltage p and the exciter pulse 7 and the detector 6,

The rising and decaying oscillation envelope selected by the detector is fed to the inputs of three amplitude selectors 10, 11 and 12. When the rising signal reaches the first selector 10, the control unit 13 outputs a signal to the electronic switch 2, which turns off the autogenerator 1 and begins the process of damping free oscillations of the resonator.

When damping oscillations reach the second 11 and third 12 amplitude selectors, pulses are generated at their outputs, respectively, which open and close the selector pulse 14, as a result of which the pulse pulse 7 from the pulse shaper 7 is transmitted to frequency dividers 15, 16 and 17, after which the passage through the switch 18, their number is calculated by the memory register 20.

The obtained Q number, proportional to the Q factor of the resonator, through the census block 21 is recorded in the comparison register 19 in an inverted form. Then the clock switch 8 turns off the detector and connects the automatic calibration block 9 to the inputs of the amplitude selectors

At the same time, the electronic key 2 from the control unit 13 receives a signal including a resonator excitation unit to receive filling pulses of a calibrated exponent with the same frequency

Further, the device operates in the sequence described above, with the difference that the signal from the automatic calibration circuit is supplied to the amplitude selector inputs, and the pulse from the driver only passes through divider 15, mine dividers 17 and 16.

The obtained number Kj is calculated in comparing register 19 with the previously recorded number 9, If the number is Q, then the display circuit 23 illuminates the AND sign (not suitable) and simultaneously a signal is sent to the mechanical distributor 24, which 5 directs the resonator to the reject channel.

The cycle is interrupted.

If Kj 4 t °, the resonator is good in good quality, the cycle is, i.e. According to the signal from the control unit 13, the automatic calibration unit 9 outputs the next calibrated exponent through the clock switch 8 to the 5th dial selector 11, thus comparing with the number Kg. If KJ 7 / Qi resonator remains in the third class, since. In this case, the coincidence unit 22 generates an enable signal and the control unit 13 further, following the program, switches the reference resistor R in series with the measured resonator, resets the comparison register to 0 and excites the resonators with the measurement of the new number of pulses.

In contrast to the previous case, the pulses pass through dividers 15 and 16, and the resulting number is 2. Qjj (the division factor of divider 17 is always 1: 2) is written to the comparison register 19 ..

If 2 Qg OY, which corresponds to jT. E. dynamic resistance of the test resonator {. larger than the reference resistor, then the display circuit 23 illuminates the H and the resonator rejects.

The cycle is interrupted.

If) f, which corresponds to that, the display scheme flashes on the display T-W, i.e. the resonator is fit and corresponds to the third class, and the mechanical distributor directs the resonator to the channel of this class.

In the case, a comparison is made with the number K and then the work is similar to the case of K? Q.

IF Kj Of-CKf, then the resonator remains in the second class and is checked by the magnitude of the dynamic resistance as in case 1 40i

KQi with the difference that the G-2 is displayed on the board.

If K. (, then G-1 is highlighted.

Claims (2)

1. Authors certificate of the USSR 389470, cl. G 01 R 27/26, 1973. 2. Authors certificate of USSR I 427295, cl. G 01 R 29/22, 1974.