SU976402A1 - Quartz resonator dy namic temperature frequency characteristic digital meter - Google Patents

Description

The invention relates to a measurement technique and can be used in the development of digital measurement systems for measuring the static and dynamic parameters of quartz resonators.

A device for automatically recording the temperature-frequency characteristics of quartz resonators, containing a temperature setter, a quartz oscillator oscillator temperature stabilization channel, two mixers, two reference frequency generators, a filter, a frequency multiplier, a linear frequency converter, a recorder 1.

The known device has a lack of accuracy.

The closest in technical essence to the invention is a device comprising a series-connected pulse generator, a control unit, a period-code converter, a first RAM block and a recorder, a series-connected polling unit and a second RAM block, as well as a pulse counter, divider, frequency, AND element, trigger and additional periodical converter, the first input of the frequency amplifier is connected to the first output of the control unit, the first input of the pulse counter is connected To the first input of the converter, the period is the code and the second input of the first block. And the operative array: the third input of which is connected to the second output of the polling unit, the third output of the last is connected to the second input of the recorder, the third input of the last is connected to the first output of the second block the second memory of the control unit connect5 is not connected with the second input of the second memory block, and the output of the pulse shaper is connected to the second input of the frequency divider, VESSOD of the pulse counter is connected to the first

The 20 input of the element I and to the second input of the control unit, the opio-input of the element I is connected with the first input of the control unit, the output of the element I is connected to the input of the trigger, the output of which is connected to the input of the additional period-code converter, the output of the latter is connected to the second input of the RAM block D 2. However, the known device has a low accuracy in restoring dynamic volumes; the speed of the characteristics (DGCH), since the measurement points along the axis are uniform.

The aim of the invention is to noHbiuje the measurement accuracy

This goal is achieved by the fact that a digital meter measuring the dynamic temperature-frequency characteristics of quartz resonators, containing a semiconductor connected pulse generator, a period-code converter control unit, a first RAM unit and a recorder, serially connected polling unit and a second operative unit memory, as well as a counter, pulses and a frequency divider, the first input of which is connected to the first output of the control unit, the first input of the pulse counter is connected to the first input of the transducer the period-code bar and the second input of the first memory block, the third input of which is connected to the second output of the polling unit, the third output of the last one is connected to the second input of the recorder, the third input of which is connected to the first output of the second memory block, the second output of the control unit is connected A serially connected converter unit, temperature setpoint and autogenerator are inputted to the second input of the second memory unit, and the pulse driver output is connected to the second frequency splitter input. serially connected decoder, ko 1 IUtotop, pulse selector and current time counter, the first output of which is connected to the first input of the pulse former, the second input of which is connected to the output of the autogenerator, while the second input of the current time counter is connected to the second output of the control unit, the second output counter, the current time is connected to the third input of the second memory unit, the third output of the control unit is connected to the input of the conversion unit, the output of the frequency divider is connected to the second the input of the switch, the output of which is connected to the second input of the pulse counter, the output of the latter is connected to the input of the decoder, the second input of the pulse selector is connected to the output of the pulse generator, and the output of the pulse selector is connected to the second input of the period-code converter and the fourth input of the second RAM memory unit .

FIG. 1 shows a functional diagram of the meter; in fig. 2 - time diagrams of the function of temperature variation and dynamic temperature-frequency characteristics (DFC)

 Digital simulator, DTHKH contains preset. temperature generator 2, GF € obrazptel nyp block 3, designed 1i, 1G to control the temperature in accordance with the heat source:

With heat chamber with temperature, voltage controlled), GJJOK 4 controls, driver 5 pulses, frequency divider b, switch 7 current time counter 8, block 9

RAM, selector 10, period-code converter 1.1, pulse counter 12, decoder 13, polling block 14, RAM block 15, recorder 16.

The operation of the digital meter in the measurement mode is as follows.

In the initial state, the divider 6, the counter 8, the block 9, the converter 11, the counter 12 and the block 15 are zeroed and closed for informational, signals on the inputs connected to the outputs of the control block 4. At the output of block 3, there is an initial voltage E, which corresponds to the initial temperature in the setpoint lt °. The pulses of the investigated frequency from the output of the imaging unit 5 are fed continuously to the input of the control unit 4 and to the closed inputs of the divider 6 and the selector 10.

0 at a specific point in time, with

tied to the front of the information. pulse, control block 4 opens divider 6, counter 8, block 9, period-code converter 11, counter 5, and starts block 3, the output of which begins to change the voltage according to a predetermined law. A change in voltage causes a change in temperature (FIG. 2)

0 as a result of which the frequency of the quartz resonator changes (Fig. 2),

The frequency divider 6 continuously divides the frequency f, and the outputs corresponding to different coefficients

5 divisions, connected to the second input of the switch 7.

The function of changing the frequency of a quartz resonator in both static and dynamic modes is usually complex (especially in dynamics) (Fig. 2), and with extreme accuracy it is necessary to monitor characteristic extremal points (in Fig. 2, points 17 and 18), as well as some singular points (in Fig. 2

5 point 19). The remaining parts are restored fairly accurately with a large discreteness of measurement points. Obviously, for high-precision recovery of the entire function

0, it is possible to control the oscillation frequency with a constant measurement step, providing the required accuracy in the most important areas. However, it is necessary to use multi-cell memory blocks, which is not justified and requires hardware costs.

To reduce the number of memory cells while maintaining accuracy, the frequency setting function, the nature of which is usually known and necessary only to be restored with precision, is divided into sections with different sampling coefficients (in Fig. 2, sections I, II, III, W, V , Vi), the division factors of divider 6 (in Fig. 2, the coefficients n 2, n,) are selected,

At the beginning of the measuring cycle switch 7 connects to the inputs of the meter a. 12 and selector 10 output divider with a factor of m. A positive pulse IF / n opens the selector 10, and the closest one after opening opens with a duration equal to the period of the frequency under study, which is converted into code by the converter 11. The pulse code from the output of the converter 11 is rewritten into block 15. At the end of the pulse frequency f / n, the selector 10 is closed. With the appearance of the next positive frequency pulse f / n, the selector 10 opens and the conversion — the recording of the pulse nearest to the moment of opening the selector 10 repeats.

The f / n frequency pulses are considered to be counter 12. The decoder 13 emits a switch switching pulse in the event that 12 codes of certain numbers equal to the number of measurement points in the information sections appear on the counter outputs. For example, in measurement area 1 (Fig. 2), the number of information points is four. With the appearance at the output of the counter 12 of the four-digit code, the decoder triggers the switch 7, which in turn connects to the first input of the counter 12 a divider output corresponding to the AND coefficient. After this, the conversion process of recording the periods of the frequency under study repeats until the switch 7 switches and so on. d.

At the initial measurement time, the current time counter 8 is started, the function of which is to form a time scale. At the output of the counter 8, there is always a current time code, which is recorded as follows. After the selector 10 is opened with the leading edge of a pulse arriving at the period-code converter 11, the current time code is rewritten into the operational memory block 9. The process of recording the current time codes continues until a certain point in time that has been preset, after expiry of which the driver 5 is closed at the first input by a signal from the output of the current time counter 8. The measurement process is complete.

Thus, as a result of the measurement, in blocks 9 and 15 of the working memory, the current time codes and the corresponding information period codes were recorded throughout the entire frequency variation function section.

In the read mode, polling unit 14 polls, with a certain cyclical nature, blocks 9 and 15, information from the outputs of which is recorded by the recorder 16. A current time needle is formed and the corresponding frequency change function is a dynamic temperature-frequency characteristic of a quartz resonator (Fig. 2).

The proposed digital meter can be used at the enterprises-manufacturers of quartz resonators, as well as at the input control of enterprises-consumers, since the static and dynamic temperature-frequency characteristics of the resonators are important metrological indicators.

A significant increase in the accuracy of DF measurement with given hardware costs (or a decrease in hardware costs at a given accuracy in the most important areas, achieved as a result of uneven distribution of information points, distinguishes the proposed meter from the known ones.

Claims (1)

Invention Formula A digital dynamic-frequency meter for quartz resonators containing a series-connected pulse shaper, a control unit, a period-code converter, the first 5 main memory unit and a recorder, a series-connected polling unit and a second main memory unit, and a pulse counter frequency divider, the first input of which is connected to the first output of the control unit, the first input of the pulse counter is connected to the first input of the period-code converter and the second input in the first block RAM memory, a third input of which is connected to the second output of op unit. dew, the third output of the latter is connected to the second input of the recorder, the third input of which is connected to the first output of the second RAM memory unit, the second output of the control unit is connected to the second input of the second RAM memory unit, and the output of the pulse shaper is connected to the second input of the frequency divider, which differs by that