CN220554003U - Comprehensive frequency correction device - Google Patents
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Abstract
The utility model discloses a comprehensive frequency correction device, belongs to the technical field of electronic information systems, and solves the problems that an internal frequency standard of existing time system equipment needs to be disassembled and a checking procedure is complicated and long in period, and user use is affected. The comprehensive frequency correction device comprises a receiving unit, a rubidium clock unit and a control unit, wherein the receiving unit is used for receiving satellite signals and transmitting the satellite signals to the rubidium clock unit after analyzing the satellite signals; the rubidium clock unit is used for outputting an internal frequency standard signal calibrated by the analyzed satellite signal; the input unit is used for inputting a signal to be detected and an external reference signal; the input unit and the rubidium clock unit are connected with the control unit and are used for receiving the external reference signal, the signal to be detected and the internal frequency standard signal, processing and outputting the external reference signal, the signal to be detected and the internal frequency standard signal. The comprehensive frequency calibrating device can read and calibrate the frequency of the internal frequency standard of the time system equipment in the field.
Description
Technical Field
The utility model belongs to the technical field of electronic information systems, and particularly relates to a comprehensive frequency correction device.
Background
The time system device (hereinafter referred to as "time system device") mainly receives standard time information (such as GPS, GLONASS, beidou, B-code, shortwave, etc.) and keeps high-precision synchronization with the standard time information, and provides unified standard time for each time user in various interface forms, so as to achieve time unification. The time system equipment can keep high-precision time keeping for a long time without an external signal source, the time keeping precision is dependent on the time keeping error of an internal frequency standard (mainly a rubidium atomic clock and a few of constant-temperature crystal oscillators), the time keeping error mainly comprises the frequency configured by the internal frequency standard and the drift rate thereof, the time keeping error is related to the time keeping time of the equipment, and the error can be accumulated with time. The internal frequency standard is used as one of the core components of the time system equipment, the physical mechanism determines the aging drift phenomenon of the equipment under the condition of continuous operation for a long time, and the output index is out of tolerance.
The time system equipment of early delivery does not have the function of monitoring and calibrating the internal frequency standard, can not test whether the internal frequency standard needs to have deviation, and if the deviation exists, calibration measurement is needed to be carried out, and the frequency deviation caused by aging is corrected. The operation flow is to remove the frequency standard from the time system equipment and send the frequency standard to a calibration laboratory for calibration, and then to be assembled back to the time system equipment after the calibration is completed. Removing the internal frequency standard will cause the time system equipment to fail to work normally, and the inspection procedure is tedious and long in period, affecting the use of users.
Disclosure of Invention
The utility model aims to provide a comprehensive frequency correction device, which solves the problems that the internal frequency standard of time system equipment needs to be disassembled and the checking procedure is complicated and long in period, and the use of a user is influenced.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows: the utility model provides a comprehensive frequency correction device which characterized in that includes:
the receiving unit is used for receiving the satellite signals, analyzing the satellite signals and transmitting the satellite signals to the rubidium clock unit;
the rubidium clock unit is used for outputting an internal frequency standard signal calibrated by the satellite signal after analysis;
the input unit is used for inputting a signal to be detected and an external reference signal;
the input unit and the rubidium clock unit are connected with the control unit and are used for receiving the external reference signal, the signal to be detected and the internal frequency standard signal, processing and outputting the external reference signal, the signal to be detected and the internal frequency standard signal.
In some embodiments, the integrated frequency correction device further includes a display unit, where the display unit is connected to the control unit, and is configured to display data output by the control unit.
In some embodiments, the control unit includes an external reference signal conditioning module, a signal conditioning module to be measured, a reference selection module, an error multiplication module, and a frequency measurement module, where the external reference signal conditioning module is sequentially connected with the reference selection module, the error multiplication module, and the frequency measurement module, and the signal conditioning module to be measured is respectively connected with the error multiplication module and the frequency measurement module.
In some embodiments, the external reference signal conditioning module conditions the external reference signal and then outputs an external frequency standard signal, and the output external frequency standard signal is fed back to the reference selection module and the frequency measurement module;
the signal to be measured conditioning module conditions the signal to be measured and then outputs a standard signal to be measured, and the output standard signal to be measured is fed back to the error multiplying module and the frequency measuring module;
the reference selection module is connected with the rubidium clock unit, and is used for selecting an internal frequency standard signal output by the rubidium clock unit and an external frequency standard signal output by the external reference signal conditioning module and respectively transmitting the selected signals to the error multiplication module and the frequency measurement module;
the error multiplication module is used for identifying the frequency difference signals of the signals output by the reference selection module and the standard signals to be tested and transmitting the results to the frequency measurement module;
the frequency measurement module measures the external frequency standard signal, the internal frequency standard signal, the standard signal to be measured and the frequency difference signal.
In some embodiments, the control unit further includes a drive isolation module connected to the reference selection module, the drive isolation module receiving the signal output by the reference selection module and transmitting it to an external device.
In some embodiments, the rubidium clock unit and the control unit are both connected to the terminal device for monitoring the status of the rubidium clock unit and the external timing device.
In some embodiments, the external reference signal is 5/10MHz.
In some embodiments, the integrated frequency correction device further comprises a power supply unit, wherein the power supply unit is connected with an external device to be tested and supplies power for the integrated frequency correction device.
In some embodiments, the power supply unit comprises a power supply filter, and a DC/DC power supply connected with the power supply filter, wherein the power supply filter converts alternating current 220V into direct current 24V, and the DC/DC power supply outputs direct current 24V into two paths of direct current 12V and direct current 24V respectively.
In some embodiments, the signal to be measured is connected to a constant temperature crystal oscillator of an external time system device or a rubidium clock of the external time system device.
Compared with the prior art, the comprehensive frequency correction device can read and correct the frequency of the internal frequency standard of the time system equipment in the field, so that the frequency accuracy of the internal frequency standard of the time system is improved, the maintenance time is shortened, and the use of a user is not influenced.
Drawings
FIG. 1 is a schematic diagram of a comprehensive frequency correction device according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a control unit in the integrated frequency correction device according to an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be clearly understood that terms such as "vertical", "horizontal", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of describing the present utility model, and do not mean that the apparatus or element referred to must have a specific orientation or position, and thus should not be construed as limiting the present utility model. In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The comprehensive frequency correction device provided by the embodiment of the utility model, as shown in fig. 1, comprises:
the receiving unit is used for receiving the satellite signals, analyzing the satellite signals and transmitting the satellite signals to the rubidium clock unit;
the rubidium clock unit is used for outputting an internal frequency standard signal calibrated by the analyzed satellite signal;
the input unit is used for inputting a signal to be detected and an external reference signal;
the input unit and the rubidium clock unit are connected with the control unit and are used for receiving the external reference signal, the signal to be detected and the internal frequency standard signal, processing and outputting the external reference signal, the signal to be detected and the internal frequency standard signal.
After the scheme is adopted, the comprehensive frequency correction device can read and calibrate the frequency of the internal frequency standard of the time system equipment on site, so that the frequency accuracy of the internal frequency standard of the time system is improved, the maintenance time is shortened, and the use of a user is not influenced.
More specifically, the receiving unit is a receiver, and receives and parses the satellite signal to obtain a standard 1PPS signal. The embodiment adopts the WXJ-GB21 of the satellite, the dual-mode baseband chip and the radio frequency chip are integrated in the module, and the dual-mode baseband chip and the radio frequency chip have the characteristics of small size and low power consumption, and the module can realize BD2 or GPS single positioning time service and BD2/GPS dual-system hybrid positioning time service. The timing precision is better than 100ns, and the performance is stable.
The outdoor CPU of the control unit adopts an ARM chip STM32F207ZET6 of ST company, the size is only 20 multiplied by 20, the internal resources are rich, the processing capacity is strong, the highest clock can reach 120MHz, and the peripheral interface is provided with a LOCAL BUS BUS, so that the functions of receiver control and information analysis, taming of rubidium clock, parameter storage and external monitoring are realized.
The model of the interface of the rubidium clock unit is SMA, the rubidium clock unit is connected with the control unit in a wire arrangement mode, and the interface of the rubidium clock side is DB-9S.
In a specific implementation process of this embodiment, the integrated frequency correction device further includes a display unit, where the display unit is connected to the control unit and is configured to display data output by the control unit.
More specifically, the display unit may be a display key board, where the display key board includes a key, an LED lamp and a liquid crystal screen, and the liquid crystal screen displays data output by the control unit by adjusting brightness of the LED lamp through the display key.
In a specific implementation process of this embodiment, as shown in fig. 2, the control unit includes an external reference signal conditioning module, a signal conditioning module to be detected, a reference selection module, an error multiplication module, and a frequency measurement module, where the external reference signal conditioning module is sequentially connected with the reference selection module, the error multiplication module, and the frequency measurement module, and the signal conditioning module to be detected is respectively connected with the error multiplication module and the frequency measurement module.
In a specific implementation process of the embodiment, as shown in fig. 2, the external reference signal conditioning module conditions an external reference signal and outputs an external frequency standard signal, and the output external frequency standard signal is fed back to the reference selection module and the frequency measurement module;
the signal to be measured conditioning module conditions the signal to be measured and then outputs a standard signal to be measured, and the output standard signal to be measured is fed back to the error multiplying module and the frequency measuring module;
the reference selection module is connected with the rubidium clock unit, selects an internal frequency standard signal output by the rubidium clock unit and an external frequency standard signal output by the external reference signal conditioning module, and transmits the selected signals to the error multiplication module and the frequency measurement module respectively;
the error multiplication module is used for identifying the frequency difference signals of the signals output by the reference selection module and the standard signals to be tested and transmitting the results to the frequency measurement module;
and the frequency measurement module is used for measuring the external frequency standard signal, the internal frequency standard signal, the standard signal to be measured and the frequency difference signal.
More specifically, the external reference signal conditioning module conditions an external reference signal and outputs an external frequency standard signal to the reference selection module and the frequency measurement module;
the external reference signal conditioning module consists of an external reference signal conditioning circuit, wherein the external reference signal conditioning circuit comprises a first radio-frequency circuit, a first frequency selector, a first band-pass filter and a first time-frequency distributor; after the standard 5/10MHz signal is amplified by the current of the first radio-following circuit, the standard 5/10MHz signal enters a first frequency selector and a first band-pass filter to select a 10M sinusoidal signal, and the standard 10M signal is multiplexed and output by a first time-frequency distributor;
the signal to be measured conditioning module conditions the signal to be measured and outputs a standard signal to be measured to the error multiplying module and the frequency measuring module;
the signal conditioning module to be tested consists of a signal conditioning circuit to be tested, and the signal conditioning circuit to be tested comprises a second radio-frequency circuit, a second frequency selector, a second band-pass filter and a second time-frequency distributor; after the 5/10MHz signal to be measured is amplified by the current of the second radio-following circuit, the amplified signal enters a second frequency selector and a second band-pass filter to select a 10M sinusoidal signal, and the 10M signal to be measured is multiplexed and output by a second time-frequency distributor;
the reference selection module selects an external frequency standard or an internal frequency standard according to user setting, when the external frequency standard is effective, the external frequency standard is automatically selected, and when the external frequency standard is invalid, the internal frequency standard is automatically selected; the reference selection module selects a reference source according to the presence or absence of satellite signals, the comprehensive frequency correction device receives the satellite signals and analyzes the satellite signals to obtain standard 1PPS signals, the standard 1PPS signals are used for correcting the rubidium clock in the rubidium clock unit, and the internal frequency standard signals, namely standard 5/10MHz signals, are output; if the satellite signal is not available, the field standard 5/10MHz signal is used as an external frequency standard signal for reference, the reference selection module is connected with the rubidium clock unit, the internal frequency standard signal output by the rubidium clock unit and the external frequency standard signal output by the external reference signal conditioning module are selected, and the selected signals are respectively transmitted to the error multiplication module and the frequency measurement module;
the error multiplication module is used for identifying the frequency difference signals of the signals output by the reference selection module and the standard signals to be tested and transmitting the results to the frequency measurement module; the error multiplication module is a filtering, amplifying and shaping circuit, and the filtering, amplifying and shaping circuit realizes the filtering of the output 500Hz signal;
the frequency measurement module measures the external frequency standard signal, the internal frequency standard signal, the standard signal to be measured and the frequency difference signal.
In a specific implementation process of this embodiment, as shown in fig. 2, the control unit further includes a driving isolation module, where the driving isolation module is connected to the reference selection module, and the driving isolation module receives a signal output by the reference selection module and transmits the signal to an external device.
More specifically, the signal output by the reference selection module in the control unit of the comprehensive frequency comparison device can also provide reference for external equipment.
In a specific implementation process of this embodiment, the rubidium clock unit and the control unit are both connected to the terminal device, so as to monitor the states of the rubidium clock unit and the external time system device.
More specifically, the rubidium clock unit realizes the taming function of built-in rubidium clock and external rubidium clock, and rubidium clock unit and the control unit are all connected with terminal equipment, can monitor rubidium clock unit and control unit through the serial ports and adjust its frequency, the RS232 interface that the serial ports adopted, and terminal equipment can record and analyze data simultaneously.
In a specific implementation of this embodiment, the external reference signal is 5/10MHz.
More specifically, the waveform of the signal to be measured is a sine wave or a square wave, the external reference signal is standard 5/10MHz, and the waveform is a sine wave. The comprehensive frequency correction device can provide universal reference signals for various external devices on the market.
In a specific implementation process of this embodiment, as shown in fig. 1, the comprehensive frequency correction device further includes a power unit, where the power unit is connected to an external device to be tested and supplies power to the comprehensive frequency correction device itself.
In a specific implementation process of this embodiment, the power supply unit includes a power supply filter and a DC/DC power supply connected to the power supply filter, where the power supply filter converts the ac power 220V into the DC power 24V, and the DC/DC power supply outputs the DC power 24V into two paths of DC power 12V and DC power 24V, respectively.
More specifically, the rubidium clock and the external serial port level are in the RS232 standard, and the CPU interface standard is in the LVTTL standard, so that the level conversion circuit is required to realize the level standard conversion. The power supply unit can convert alternating current 220V into stable 24V and 12V direct current, and can supply power for an external device to be tested as well as self power supply. The rubidium clock unit is also connected with the power supply unit in a flat cable mode, and meanwhile, an interface of the rubidium clock side is DB-9S.
The CPU power supply in the control unit is 3.3V, the efficiency of the mode of directly converting +12V into 3.3V through a low dropout linear voltage regulator (namely LDO) is low, and the mode of directly adopting DC/DC conversion is often overlarge in ripple, so that the mode of combining DC/DC and LDO is adopted, the DC/DC is converted into +5V from +12V and then converted into +33.3V from +5V through LDO, in the embodiment, the DC/DC adopts a mature module circuit, the LDO adopts a special LDO chip, and only a simple external capacitor is needed to filter input and output.
AMS1117-3.3 is adopted uniformly by LDO, and the LDO has the characteristics of small voltage drop, high precision, small volume and large output current, and can meet the 3.3V power supply requirement of each module in the comprehensive frequency correction device.
In a specific implementation process of this embodiment, the signal to be measured is connected to a constant temperature crystal oscillator of an external time system device or to a rubidium clock of the external time system device.
More specifically, when a signal to be detected is connected with a constant-temperature crystal oscillator of external time system equipment, the comprehensive frequency correction device enters a starting interface after being installed and connected, the comprehensive frequency correction device receives satellite signals, and a rubidium clock in a rubidium clock unit is calibrated; the working mode selects a measuring mode, at the moment, the comprehensive frequency correction device is used as frequency test equipment for measuring the frequency accuracy of the 5/10MHz signal of the constant-temperature crystal oscillator, and a user can manually rotate the mechanical terminal of the crystal oscillator according to the measurement result of the comprehensive frequency correction device, so as to adjust the output frequency until the frequency accuracy meets the requirement.
When a signal to be detected is connected with a rubidium clock of external time system equipment, the comprehensive frequency correction device enters a starting interface after being installed and connected, the comprehensive frequency correction device receives satellite signals, and the rubidium clock in the rubidium clock unit is calibrated; the working mode selects a calibration mode (a measurement mode can be selected firstly to check whether the current measured frequency source meets the requirement or not); selecting rubidium Zhong Leixing, selecting and setting a frequency threshold value for rubidium clock calibration, e.g. 5×10 -11 After the setting is completed, the frequency correction work can be automatically started; after the display unit reads the frequency accuracy of the rubidium clock of the current external time system equipment, the frequency accuracy is compared with a set threshold value, when the frequency of the rubidium clock to be measured is deviated, the frequency is adjusted through the serial port, then the frequency is compared after the adjustment, and the frequency is adjusted until the output frequency reaches the threshold value requirement.
The rubidium clock types are three types of XHTF1021, WR1011 and LPFRS01, and are not limited to the three types of rubidium clock.
The working flow provided by the embodiment of the utility model is as follows: when a signal to be detected is connected with a constant-temperature crystal oscillator of external time system equipment, the integrated frequency correction device enters a starting interface after being installed and connected, a reference selection module selects a reference source according to the existence of satellite signals, the integrated frequency correction device receives the satellite signals and analyzes the satellite signals to obtain standard 1PPS signals, the standard 1PPS signals are used for correcting a rubidium clock in a rubidium clock unit, and an internal frequency standard signal, namely a standard 5/10MHz signal, is output; if no satellite signal exists, the field standard 5/10MHz signal is used as an external frequency standard signal for reference; the reference selection module is connected with the rubidium clock unit, selects the internal frequency standard signal output by the rubidium clock unit and the external frequency standard signal output by the external reference signal conditioning module, and transmits the selected signals to the error multiplication module and the frequency measurement module respectively; the error multiplication module is used for identifying the frequency difference signals of the signals output by the reference selection module and the standard signals to be tested and transmitting the results to the frequency measurement module; and the frequency measurement module measures the external frequency standard signal, the internal frequency standard signal, the standard signal to be measured and the frequency difference signal until the frequency accuracy meets the requirement. The working mode selects a measuring mode, at the moment, the comprehensive frequency correction device is used as frequency test equipment for measuring the frequency accuracy of the 5/10MHz signal of the constant-temperature crystal oscillator, and a user can manually rotate a mechanical terminal of the crystal oscillator according to the measurement result of the comprehensive frequency correction device to adjust the output frequency; the signal conditioning module to be tested conditions the constant-temperature crystal oscillator and outputs a standard signal to be tested to the error multiplying module and the frequency measuring module.
When a signal to be measured is connected with a rubidium clock of external time system equipment, the comprehensive frequency correction device enters a starting interface after being installed and connected, and a working mode selects a calibration mode (a measurement mode can be selected firstly to check whether a current measured frequency source meets the requirement or not); selecting rubidium Zhong Leixing, selecting and setting a frequency threshold value for rubidium clock calibration, e.g. 5×10 -11 After the setting is completed, the frequency correction work can be automatically started; the reference selection module selects a reference source according to the presence or absence of satellite signals, the comprehensive frequency correction device receives the satellite signals and analyzes the satellite signals to obtain standard 1PPS signals, the standard 1PPS signals are used for correcting the rubidium clock in the rubidium clock unit, and the internal frequency standard signals, namely standard 5/10MHz signals, are output; if no satellite signal exists, the field standard 5/10MHz signal is used as an external frequency standard signal for reference; the comprehensive frequency correction device receives satellite signals, and a rubidium clock in the rubidium clock unit is corrected; the reference selection module is connected with the rubidium clock unit, the reference selection module is connected with the rubidium clock unitThe method comprises the steps that an internal frequency standard signal output by a rubidium clock unit and an external frequency standard signal output by an external reference signal conditioning module are selected, and the selected signals are respectively transmitted to an error multiplication module and a frequency measurement module; the error multiplication module is used for identifying the frequency difference signals of the signals output by the reference selection module and the standard signals to be tested and transmitting the results to the frequency measurement module; and the frequency measurement module measures the external frequency standard signal, the internal frequency standard signal, the standard signal to be measured and the frequency difference signal until the frequency accuracy meets the requirement. After the display unit reads the frequency accuracy of the rubidium clock of the current external time system equipment, the frequency accuracy is compared with a set threshold value, when the frequency of the rubidium clock to be measured is deviated, the frequency is adjusted through the serial port, then the frequency is compared after the adjustment, and the frequency is adjusted until the output frequency reaches the threshold value requirement. The working mode selects a measuring mode, and the comprehensive frequency correction device is used as frequency test equipment to measure the frequency accuracy of a rubidium clock 5/10MHz signal of external time system equipment.
In summary, the comprehensive frequency correction device of the utility model can read and calibrate the frequency of the internal frequency standard of the time system equipment in the field, and can read the rubidium clock of the external time system equipment in real time, and the measurement resolution is better than 1×10 -11 The high-performance rubidium clock is needed inside the comprehensive frequency correction device, the self-calibration can be carried out through a satellite, and the accuracy after the self-calibration is better than that of 5 multiplied by 10 -11 The frequency measuring device can be externally connected with a 5/10MHz signal to serve as a reference signal for measuring the frequency of a universal rubidium atomic clock, can provide stable 24V and 12V direct current power supplies, can monitor the state of external time system equipment through a serial port and adjust the frequency of the external time system equipment, can read and calibrate the frequency of the internal frequency standard of the time system equipment on site, improves the frequency accuracy of the internal frequency standard of the time system, shortens the maintenance time, and does not affect the use of users.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides a comprehensive frequency correction device which characterized in that includes:
the receiving unit is used for receiving the satellite signals, analyzing the satellite signals and transmitting the satellite signals to the rubidium clock unit;
the rubidium clock unit is used for outputting an internal frequency standard signal calibrated by the satellite signal after analysis;
the input unit is used for inputting a signal to be detected and an external reference signal;
the input unit and the rubidium clock unit are connected with the control unit and are used for receiving the external reference signal, the signal to be detected and the internal frequency standard signal, processing and outputting the external reference signal, the signal to be detected and the internal frequency standard signal.
2. The comprehensive frequency correction device according to claim 1, further comprising a display unit, wherein the display unit is connected to the control unit, and is configured to display data output by the control unit.
3. The comprehensive frequency correction device according to claim 1 or 2, wherein the control unit comprises an external reference signal conditioning module, a signal conditioning module to be detected, a reference selecting module, an error multiplying module and a frequency measuring module, the external reference signal conditioning module is sequentially connected with the reference selecting module, the error multiplying module and the frequency measuring module, and the signal conditioning module to be detected is respectively connected with the error multiplying module and the frequency measuring module.
4. The comprehensive frequency correction device according to claim 3, wherein the external reference signal conditioning module conditions the external reference signal and outputs an external frequency standard signal, and the output external frequency standard signal is fed back to the reference selection module and the frequency measurement module;
the signal to be measured conditioning module conditions the signal to be measured and then outputs a standard signal to be measured, and the output standard signal to be measured is fed back to the error multiplying module and the frequency measuring module;
the reference selection module is connected with the rubidium clock unit, and is used for selecting an internal frequency standard signal output by the rubidium clock unit and an external frequency standard signal output by the external reference signal conditioning module and respectively transmitting the selected signals to the error multiplication module and the frequency measurement module;
the error multiplication module is used for identifying the frequency difference signals of the signals output by the reference selection module and the standard signals to be tested and transmitting the results to the frequency measurement module;
the frequency measurement module measures the external frequency standard signal, the internal frequency standard signal, the standard signal to be measured and the frequency difference signal.
5. The integrated frequency correction device of claim 4, wherein the control unit further comprises a drive isolation module, the drive isolation module is connected with the reference selection module, and the drive isolation module receives the signal output by the reference selection module and transmits the signal to an external device.
6. The integrated frequency correction device of claim 1, wherein the external reference signal is 5/10MHz.
7. The comprehensive frequency correction device according to claim 1 or 2, further comprising a power supply unit, wherein the power supply unit is connected to an external device to be measured and supplies power to the comprehensive frequency correction device itself.
8. The integrated frequency correction device according to claim 7, wherein the power supply unit includes a power supply filter, a DC/DC power supply connected to the power supply filter, the power supply filter converts the alternating current 220V into the direct current 24V, and the DC/DC power supply outputs the direct current 24V into two paths of direct current 12V and direct current 24V, respectively.
9. The comprehensive frequency correction device according to claim 8, wherein the signal to be measured is connected to a constant temperature crystal oscillator of an external time system device or a rubidium clock of the external time system device.
Priority Applications (1)
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|---|---|---|---|
| CN202321838964.4U CN220554003U (en) | 2023-07-12 | 2023-07-12 | Comprehensive frequency correction device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321838964.4U CN220554003U (en) | 2023-07-12 | 2023-07-12 | Comprehensive frequency correction device |
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| CN220554003U true CN220554003U (en) | 2024-03-01 |
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