CN204376875U - A kind of high stability crystal oscillator - Google Patents
A kind of high stability crystal oscillator Download PDFInfo
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- CN204376875U CN204376875U CN201420830779.5U CN201420830779U CN204376875U CN 204376875 U CN204376875 U CN 204376875U CN 201420830779 U CN201420830779 U CN 201420830779U CN 204376875 U CN204376875 U CN 204376875U
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Abstract
The utility model relates to a kind of high stability crystal oscillator, is connected and composed by Beidou satellite navigation receiver, rubidium atomic clock, frequency counter and computer for controlling; Beidou satellite receiver is connected to the 1PPS IN port of rubidium atomic clock by 1PPS signal port, the external reference signal input port REF IN of frequency counter is connected to from rubidium atomic clock 10MHZ output, computer for controlling is connected to the gpib interface of frequency counter through USB GPIB patchcord, the test frequency input IN of the signal output part OUTPUT rate of connections counter of tested oscillator, outputs to frequency counter by the signal of tested oscillator; Have employed high stable frequency reference, substantially increase frequency measurement accuracy, the error brought by frequency counter has dropped to negligible degree, eliminates the nearly one hour pre-heat-stable time that frequency counter is started shooting at every turn, accomplishes that start can use.Adopt computer recording data, decrease operating personnel and read the charactron frequently flashed and manually to estimate and the error brought of record data and data are omitted, all data record are preserved hereof.
Description
Technical field
The utility model relates to electronic product production test field, in particular to a kind of high stability crystal oscillator, the crystal oscillator in communication equipment is accurately debugged, be applicable to communication equipment and accurately measure and calibration frequency error, and record adjustment process data, the application of analytical error trend.
Technical background
In the scientific research of digital communication product and in producing, the precision of transmitting and receiving frequency is an important indicator of communication equipment, the precision of reception, tranmitting frequency is determined by the high stability crystal oscillator in product, oscillator frequency is adjusted to specification error scope and ensures that long-term stability is an important process in communication equipment research and production.
Existing problems: the way in the past adjusting oscillator frequency is: the input interface rate-adaptive pacemaker of tested crystal oscillator being terminated to frequency counter, according to the reading of frequency counter, operating personnel judge whether frequency of oscillation meets technical specification, then adjust tested crystal oscillator make it to meet the requirements as exceeded error range, when adjusting within the scope of specification error, observed frequency stability need be continued, must ensure that the range of readings of frequency counter can not exceed technical requirement within the continuous time of regulation.This method has following shortcoming: 1. frequency counter itself can not be determined when stable operation personnel test, and needs the stabilization time of 1 hour after frequency counter start.2. operating personnel's frequency counter screen of wanting long-term observation constantly to flash when measuring, easily because of visual fatigue generation error, too fastly hand-writtenly cannot catch up with data jump because flashing, can only with estimated record.3. the observation of frequency stability can only observe display data whether within the scope of technical indicator for a long time by operating personnel.Trend can only be moved towards according to reading evaluated error, there is no data record, be not easy to quality of production management and follow-uply carry out data analysis.
How to address this problem the problem just becoming those skilled in the art and will study and solve.
Summary of the invention
The purpose of this utility model is exactly for overcoming the deficiencies in the prior art, reading for existing frequency counter judges the accurate problem of frequency of oscillation, a kind of High Precision Frequency equipment is provided to carry out crystal oscillator debugging, adopt big-dipper satellite time signal Tame Rubidium Clock, the high accuracy 10MHZ signal supply frequency counter exported by rubidium clock, by computer installation frequency counter breaking inner crystal oscillator, adopt the external reference signal that rubidium clock provides.By the characteristic utilizing the time signal of big-dipper satellite synchronous with the high accuracy atomic clock of Big Dipper ground station, realize the long-time stability of frequency counter, thus make the frequency accurate adjustment of tested crystal oscillator within the scope of specification error, greatly improve Measurement sensibility degree.
The utility model is realized by such technical scheme: a kind of high stability crystal oscillator, is characterized in that, is connected and composed by Beidou satellite navigation receiver, rubidium atomic clock, frequency counter and computer for controlling;
Satellite earth antenna is connected to the ANT interface of Beidou satellite receiver, the 1PPS IN port of rubidium atomic clock is connected to by 1PPS signal port through Beidou satellite navigation receiver, the external reference signal input port REF IN of frequency counter is connected to from rubidium atomic clock 10MHZ output, computer for controlling is connected to the gpib interface of frequency counter through USB GPIB patchcord, the test frequency input IN of the signal output part OUTPUT rate of connections counter of tested oscillator, outputs to frequency counter by the signal of tested oscillator;
The beneficial effects of the utility model: actual use in production process, this scheme will have employed high stable frequency reference, substantially increase frequency measurement accuracy, the error brought by frequency counter has dropped to negligible degree, eliminate the nearly one hour pre-heat-stable time that frequency counter is started shooting at every turn, accomplish that start can use.Adopt computer recording data, decrease operating personnel and read the charactron frequently flashed and manually to estimate and the error brought of record data and data are omitted, all data record are preserved hereof.Adopt the design philosophy of visual production, long-time for operating personnel observed frequency timer number shown and the process reading, estimate, judge, be reduced to and the trend tendency of red green two curves is judged, need not personnel on duty for a long time.Long-term stability for examination frequency stability provides a new thinking.Data basis is provided for improving product total quality control.
Accompanying drawing explanation
Fig. 1, High Precision Frequency device connection diagram.
Embodiment
Understand the utility model in order to clearer, describe the utility model in detail in conjunction with the accompanying drawings and embodiments:
As shown in the figure, the adjustment method of crystal oscillator, utilize a kind of High Precision Frequency equipment to carry out the debugging of crystal oscillator, described High Precision Frequency equipment is connected and composed by Beidou satellite navigation receiver, rubidium atomic clock, frequency counter and computer for controlling;
Satellite earth antenna is connected to the ANT interface of Beidou satellite receiver, and the high accuracy 1PPS signal demodulated through Beidou satellite navigation receiver outputs to the 1PPS IN port of rubidium atomic clock by 1PPS signal port, for taming rubidium atomic clock; The external reference signal input port REF IN of frequency counter is sent to from the 10MHZ signal of rubidium atomic clock 10MHZ output output, computer for controlling is connected to the gpib interface of frequency counter through USB GPIB patchcord, the test frequency input IN of the signal output part OUTPUT rate of connections counter of tested oscillator, outputs to frequency counter by the signal of tested oscillator.
Adopt big-dipper satellite time signal Tame Rubidium Clock, the high accuracy 10MHZ signal exported by rubidium clock supply frequency counter, the external reference signal adopting rubidium clock to provide by computer installation frequency counter breaking inner crystal oscillator.
Due to the time signal of big-dipper satellite and the high accuracy atomic clock of Big Dipper ground station synchronous, there are excellent long-time stability.Taming this scheme of the excellent rubidium atomic clock of short-term stability by satellite-signal can provide precision to reach the frequency stability of 10E-12, is better than more than measured signal 2 orders of magnitude.
Rubidium atomic clock and satellite receiver long-time running, external reference signal with connect with, eliminate the start warm-up time of frequency counter, make the certainty of measurement of frequency counter meet the requirement of research and production completely.
Be connected with frequency counter through USB GPIB connecting line by computer for controlling, read all frequency data measuring tested oscillator and send, and with EXCEL form, the data at every turn measured are recorded in specified file, thoroughly avoid the human error that operating personnel bring.The data file of preserving can be used for scientific research personnel and quality department for analytic product quality problems.
The measurement data that computer for controlling reads from frequency counter, is labeled on frequency stability tendency chart in real time.Operating personnel need not observe ground measurement data estimated frequency error change trend of frequently beating as before for a long time.Only need namely can determination frequency variation tendency according to the curvilinear motion on tendency chart, there is an objective evaluation to the quality of oscillator.
According to the above description, scheme of the present utility model can be realized in conjunction with art technology.
Claims (1)
1. a high stability crystal oscillator, is characterized in that, is connected and composed by Beidou satellite navigation receiver, rubidium atomic clock, frequency counter and computer for controlling; Satellite earth antenna is connected to the ANT interface of Beidou satellite receiver, the 1PPS IN port of rubidium atomic clock is connected to by 1PPS signal port through Beidou satellite navigation receiver, the external reference signal input port REF IN of frequency counter is connected to from rubidium atomic clock 10MHZ output, computer for controlling is connected to the gpib interface of frequency counter through USB GPIB patchcord, the test frequency input IN of the signal output part OUTPUT rate of connections counter of tested oscillator, outputs to frequency counter by the signal of tested oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420830779.5U CN204376875U (en) | 2014-12-24 | 2014-12-24 | A kind of high stability crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420830779.5U CN204376875U (en) | 2014-12-24 | 2014-12-24 | A kind of high stability crystal oscillator |
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| CN204376875U true CN204376875U (en) | 2015-06-03 |
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| CN201420830779.5U Active CN204376875U (en) | 2014-12-24 | 2014-12-24 | A kind of high stability crystal oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181504A (en) * | 2017-12-28 | 2018-06-19 | 南京中电熊猫晶体科技有限公司 | Constant-temperature crystal oscillator reads frequency and scanning system and method for transmitting signals |
-
2014
- 2014-12-24 CN CN201420830779.5U patent/CN204376875U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181504A (en) * | 2017-12-28 | 2018-06-19 | 南京中电熊猫晶体科技有限公司 | Constant-temperature crystal oscillator reads frequency and scanning system and method for transmitting signals |
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