SU1138783A1 - Ribidium time and frequency standard - Google Patents

Abstract

FLEXIBLE FREQUENCY AND TIME STANDARD, containing a series-connected crystal oscillator frequency multiplier, a rubidium discriminator, a low-frequency amplifier, a synchronous detector and an integrating amplifier, the output of which is connected to the control input of the crystal oscillator and the first input of the logic circuit whose second input is connected to the second output low-frequency amplifier, the output of the crystal oscillator is connected through a series-connected high-frequency amplifier, the first, second frequency dividers with the input of Tp The divider: clock, the first output of which is connected to the second input of the synchronous detector, and the second to the second input of the frequency multiplier, the second output of the high frequency amplifier is connected to the input of the signal conditioner and through the frequency synthesizer to the third input of the frequency multiplier, sequentially switched on a pulse frequency divider and a time counting unit and a series-connected decoder and indicator, so that, in order to expand its functionality by introducing a measurement mode a relative frequency deviation of the external source of the standard signal-pa from the frequency of the rubidium standard of frequency and time, a multiplier of the relative frequency deviation, a control key, an operation mode switch, a switching device, a memory block i, and an automation unit are entered, and the output is Ls (L the high frequency through a multiplier of the relative frequency deviation is connected to the input of the automation unit and through the mode selector switch to the control input of the control key, through which the output of the key The signal signal is connected to the input of a pulse frequency divider, the information outputs of which are connected to the inputs of the memory block, the input of the recording resolution of which is connected to 00 with the first output of the automation unit, and to the output. - with the first input of the switching device, the second input of which is connected to the output of the time counting unit 5. and output - to the input of the decoder while the second output of the automation unit is connected to the installation input in O of the pulse frequency divider.

Description

one . This invention relates to a measurement technique and can be used in metrology. The rubidium standard of frequency and time (RSChV) is known, which contains a crystal oscillator, multipliers, frequency telescopes, frequency dividers, amplifiers, a synchronous detector, a frequency synthesizer, a time base generator, a time counting unit, and a D indicator. The RCBV is also known, which contains a crystal oscillator whose output is connected to the input of a high-frequency amplifier, and through a series-connected multiplier frequency, a rubidium discriminator and a low-frequency amplifier are connected to the first input of a logic circuit, the output of which is connected to l display amps, and the second input - with the input of a crystal oscillator and with the output of an integrating amplifier, whose input is connected to the output of a synchronous detector, the first input connected to the second output of the low-frequency amplifier, and the second input to the first output of the first frequency divider, the first the output of the high-frequency amplifier is connected via a serially connected second and first frequency dividers connected to the second and third inputs of the frequency multiplier, and the third output is connected to the display unit t2 via a time scaler and a time counting unit . However, the known RDIs do not directly take measurements of the frequency error of quartz standards being tested (generators). At present, the measurement of the relative frequency deviation of quartz oscillators is carried out using a system consisting of a RCCH, a frequency comparator, an electron-counting frequency counter, and a rotatable oscillator, which is quite expensive, cumbersome, and has a lot of weight. The purpose of the invention is to expand the functionality by introducing the measurement mode of the relative frequency deviation of an external source of a standard signal from the frequency of the rubidium standard of frequency and time. In the rubidium frequency and time standard, containing a sequentially connected crystal oscillator 3, a frequency multiplier, a rubidium discriminator, a low frequency amplifier, a synchronous detector and an integrating amplifier whose output is connected to the control input of the crystal oscillator and to the first input of the logic circuit, the second input of which is connected to the second output of the low-frequency amplifier, the output of the crystal oscillator is connected through a series-connected high-frequency amplifier, the first, second frequency dividers with the input of the three The second frequency divider, the first output of which is connected to the second input of the synchronous detector, and the second output - to the second input of the frequency multiplier, the second output of the high frequency amplifier is connected to the input of the signal conditioner and through the frequency synthesizer - to the third input of the frequency multiplier, sequentially connected pulse frequency divider and a time counting unit and a serially connected decoder and an indicator, a multiplier for the relative frequency deviation, a control key, an operation mode switch, a switch are entered separating apparatus, a memory unit and automation unit, the output of high frequency amplifier through multiplier otnrsitel-tion frequency error is connected to the input unit and automation. through the mode selector switch to the control input of the control key, through which the output of the signal conditioner is connected to the input of a pulse frequency divider, whose information outputs are connected to the inputs of the memory unit, the write enable input of which is connected to the first output of the automation unit, and the output is the first input of the switching device, the second input of which is connected to the output of the time counting unit, and the output - to the input of the decoder, while the second output of the automation unit is connected to the installation input in O of the pulse de Ithel frequency; FIG. Figure 1 shows the RWS scheme, which provides measurement of the relative frequency deviation over time. the bounce signal in FIG. 2 - diagram of the automation unit; in fig. 3 is a frequency multiplier multiplier circuit. The rubidium standard of frequency and time contains a crystal oscillator 1, a multiplier of 2 hours 1, a rubidium discriminator 3, a low frequency amplifier 4 (ULF), a synchronous detector 5, an integrating amplifier 6, a logic circuit 7, a high frequency amplifier 8, the first divider 9 frequency, second frequency divider 10, third frequency divider 11, frequency synthesizer 12, signal shaper 13, pulse frequency divider 14, time counting unit 15, decoder 16, indicator 17, relative frequency deviation multiplier 18, control key 19, mode switch 20 operation, switching device 21, memory block 22, automation block 23. Quartz oscillator 1, multiplier 2 frequency, rubidium discriminator 3, ULF 4 ,. a synchronous detector 5 and an integrating amplifier 6 are connected in series. One input of logic circuit 7 is connected to the output of the integrating amplifier 6, and the other is connected to the second output of the ULF 4. Amplifier 8, the first 9, the second 10 and the third 11 frequency dividers are connected in series. The outputs of the third frequency divider 11 are connected to the second inputs of the multiplier 2 frequency and the synchronous detector 5. The input of the frequency synthesizer 12 is connected to the output of amplifier 8, and the output is connected to the input of the multiplier 2 frequency Shaper 13 of the signal is connected to the output of amplifier 8. Pulse divider 14 frequency and unit 15 time accounts are connected in series. Also, the decoder 16 and the indicator 17 are connected in series. A signal from an external source is fed to one input of the multiplier 18 relative frequency deviation, and another input is connected to the output of the amplifier 8. The control key 19 is connected between the driver 13 and the divider 14, and its control input is black 20 modes of operation under the keys to the output of the multiplier 18 relative frequency deviation. The switching device 21 is connected with a switch of 20 modes of operation. The inputs of the switching device are connected to the outputs of the memory block 22 and the time counting unit 15 and the output is connected to the input of the descrambler 16. The input of the memory block 22 is connected to the information outputs of the ten-day divider 14. The outputs of the automation device 23 are connected to the inputs of the frequency divider 14 and the unit 22 memory, and the input of the automation unit 23 is connected to the output of the multiplier 18. The automation device 23 is assembled according to a scheme that generates at the end of a pulse coming from the output of the multiplier of the relative frequency deviation, at the first output is a Write command signal, and at the second output, a reset signal to O, which is terminated after the information has been written to the memory. The automation unit is assembled on two series-connected waiting multivibrators. The first multivibrator is triggered by the falling edge of a pulse from the output of the multiplier relative frequency deviation. Pulse duration The recording from the output of the first multivibrator is selected by selection in such a way that during its operation it is written to the memory block. The second waiting multivibrator is triggered by the falling edge of the pulse from the output of the first multivibrator. The pulse duration of the reset signal in O at the output of the second multivibrator is selected in the same way. FIG. 3 shows a structural diagram of the frequency multiplier multiplier. The first mixer multiplies the relative frequency deviation by the second also 10 times. The overall multiplication factor is 10. The frequency multiplier 18 multiplies the square-wave pulses at the output, the duration of which is related to the relative frequency deviation by the ratio (itK | i), to / TO IC multiplication factor where relative frequency deviation; relative deviation of the frequency of the signal being tested from the frequency of the RSPC signal. The rubidium standard of frequency and time works as follows. For the duration of the pulse from the multiplier 18, the relative frequency deviation, i.e. in the mode of measuring the relative frequency deviation, the generator key 19 is open and from the driver 13 of the signal to the input of the frequency divider 14, the number of pulses M equal to T. –t is the signal period 10 MHz, K is the multiplier of the button 18 relative to the frequency deviation; T is the pulse duration. From the multiplier with respect to the frequency deviation. And after the impulse 3 ends the relative frequency deviation or the frequency 19, the key 19 is locked and the automatic control unit 23 generates a command signal to write to the information manager 22 from the frequency divider 14. The signal from the memory block 22 goes to the decoder 16, and to the indicator 17, it. which will display the number M, which will differ from the reference frequency by an integer number of units of the relative frequency difference. When the device operates in the Time Scale mode, the key 19 is open all the time and the frequency divider 14 applies pressure from a signal with a frequency of 10 MHz to 1 Hz. The time counting unit 15 counts the pulses of the next with a period of 1 s. The switching device 21 connects the output of the time counting unit 15 to the decoder 16. Thus, in the Instrument mode of operation of the instrument, the time divider 14 of the frequency will output the time scale in the form of pulses with a following frequency of 1 Hz, and the display device will show the current time. In the invention, a new functionality is provided by changing the known RSP circuit, which, with a small amount of weight and cost, makes it possible to use devices traditionally included in the RSCH to measure the relative frequency deviation of the external signal source.

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Claims (1)

A RUBIDIUM FREQUENCY AND TIME STANDARD, comprising a quartz oscillator _t ′, a frequency multiplier, a rubidium discriminator, a low-frequency amplifier, a synchronous detector and an integrating amplifier, the output of which is connected to the control input of the crystal oscillator and to the first input of the logic circuit, the second input of which is connected to the second the output of the low-frequency amplifier, the output of the crystal oscillator is connected through a series-connected high-frequency amplifier, the first, second frequency dividers with the input of the Third a frequency divider, the first output of which is connected to the second input of the synchronous detector, and the second to the second input of the frequency multiplier, the second output of the high-frequency amplifier is connected to the input of the signal conditioner, and through the frequency synthesizer, to the third input of the frequency multiplier, _d pulse frequency divider and a time counting unit and decryptor and indicator connected in series, characterized in that, in order to expand its functionality by introducing a measurement mode of relative off The frequency of the external source of the standard signal from the frequency of the rubidium standard of frequency and time is increased, a relative frequency deviation multiplier, a controlled key, an operating mode switch, a switching device, a memory unit and an automation unit are introduced into it, and the output of the high-frequency amplifier through a relative frequency deviation multiplier is connected to the input of the automation unit and through the switch of operating modes - to the control input of the managed key, through which the output of the signal conditioner is connected to the input pulse frequency divider, whose data outputs ^ ^ podklyucheny.k inputs of the storage unit, the write enable input of which is connected to the first output of the switch box, and · yield. - with the first input of the switching device, the second input of which is connected to the output of the time counting unit, and the output - to the input of the decoder, while the second output of the automation unit is connected to the installation input at 0 pulse frequency divider. / 00 m 1 1138783 2