CN101551448A - Method for testing frequency stabilization tester - Google Patents

Abstract

A method for testing frequency stabilization tester is especially used for testing XH3596 series frequency stabilization testers belonging to frequency standard comparison instruments. The method is respectively used for testing tested input sensitivity, reference input sensitivity, maximum relative frequency difference, uncertainty of same-frequency correlative comparison and uncertainty of same-source correlative comparison of the frequency stabilization tester. The method comprises the following steps of: 1. checking appearance and normal work performance; 2. connecting equipments involving referential frequency scale and frequency synthesizer; and 3. testing the frequency stabilization tester. The method has the advantages of being capable of testing XH3596 series frequency stabilization testers belonging to frequency standard comparison instruments, accurately obtaining the input sensitivity, maximum relative frequency difference, uncertainty of same-frequency correlative comparison and uncertainty of same-source correlative comparison of the XH3596 series frequency stabilization testers, and having simple testing process.

Description

The calibration method of frequency stabilization tester

Technical field:

The invention is the calibration method that is used for frequency marking comparative device product XH3596 series frequency stabilization tester.

Background technology:

XH3596 series frequency stabilization tester is and cesium atomic frequency standard or the supporting use of rubidium atomic frequency standard, be used for setting up the important support equipment of national defence I and II frequency measurement standard, according to the highest standard of measurement that uses about department and enterprise and institution in the measurement Law, comprise primary standard device and support equipment, must carry out the regulation of compulsory verification, must carry out measurement verification to XH3596 series frequency stabilization tester according to certain calibration method, can come into operation behind the assay approval.

The existing national metrological verification regulations of frequency marking comparative device is " JJG545-2006 frequency marking comparative device measurement verification regulations ", it mainly is the calibration method of working out at the frequency marking comparative device that the multiplication output terminal is arranged, and measures input sensitivity, the maximal phase of frequency marking comparative device technical indicators such as frequency difference, comparison uncertainty all will be measured with the oscillograph sum counter; But XH3596 series frequency stabilization tester does not have output terminal, can not measure by equipment such as rules regulation use oscillograph sum counters, therefore can't examine and determine according to the method that the existing measurement verification regulations of country provide at present.No homology relevance ratio is to the calibration method of uncertainty in the existing measurement verification regulations of country.

Summary of the invention:

The purpose of the invention provides a kind of calibration method that can examine and determine XH3596 series frequency stabilization tester; The purpose of the invention is achieved through the following technical solutions: the calibration method of frequency stabilization tester, and its step is as follows:

1.1 the inspection of outward appearance and property working properly: tested comparative device does not have influences the damage of operate as normal, and every sign should be known complete, the gauge tap accurate positioning, and the button flexibility and reliability, socket connects firm;

1.2 the calibrating of the tested input sensitivity of frequency stabilization tester:

1.2.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported tested end A or the B that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.2.2 calibrating: the tested end A that 1MHz, 2MHz, 2.5MHz, 5MHz, the 10MHz signal of frequency synthesizer output is connected respectively to frequency stabilization tester, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given tested input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be the tested input sensitivity of A end; 2.048MHz, 4.096MHz, 8.192MHz, the 16.384MHz signal of the output of frequency synthesizer is connected respectively to the tested end B of frequency stabilization tester, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given tested input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be the tested input sensitivity of B end;

1.3 the calibrating of the reference input sensitivity of frequency stabilization tester:

1.3.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the tested end A of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported the reference edge that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.3.2 calibrating: the frequency synthesizer output frequency is changed to 1MHz, 5MHz, 10MHz respectively, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given reference input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be with reference to input sensitivity;

1.4 the maximal phase of the tested end A of frequency stabilization tester is to the calibrating of frequency difference:

1.4.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported the tested end A that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.4.2 calibrating: the 1MHz Frequency point of choosing tested end A carries out this calibrating.The output amplitude that frequency synthesizer is set is any one value in 0.4Vrms～1.5Vrms scope, with the given tested end maximal phase of tested frequency stabilization tester frequency difference technical indicator value is provided with the output frequency value of frequency synthesizer, it is 1 * 10 that technical specification provides this technical indicator ^-7, it is 1.0000001MHz that the frequency synthesizer output frequency then is set, at this moment the relative frequency difference of the tested end A of frequency stabilization tester be set in advance into $\left|\frac{1.0000001\mathrm{MHz}-1\mathrm{MHz}}{1\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively increasing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end A sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₁By same quadrat method, it is 0.9999999MHz that the frequency synthesizer output frequency is set, the relative frequency difference of at this moment tested end A be set in advance equally into $\left|\frac{0.9999999\mathrm{MHz}-1\mathrm{MHz}}{1\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively reducing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end A sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₂δ ₁, δ ₂For the maximum on the both direction allows relative frequency difference, get wherein the smaller as verification result;

1.5 the maximal phase of the tested end B of frequency stabilization tester is to the calibrating of frequency difference:

1.5.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester front panel with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer is exported the tested end B that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.5.2 calibrating: the 2.048MHz Frequency point of choosing tested end B carries out this calibrating.The output amplitude that frequency synthesizer is set is 0.4V _Rms～1.5V _RmsAny one value in the scope is provided with the output frequency value of frequency synthesizer with the given tested end maximal phase of tested frequency stabilization tester to frequency difference technical indicator value, and providing this technical indicator in the technical specification is 1 * 10 ^-7, the output frequency that frequency synthesizer then is set is 2.0480002048MHz, at this moment the relative frequency difference of the tested end B of frequency stabilization tester be set in advance into $\left|\frac{2.0480002048\mathrm{MHz}-2.048\mathrm{MHz}}{2.048\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively increasing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end B sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₁By same quadrat method, the output frequency that frequency synthesizer is set is 2.0479997952MHz, at this moment the relative frequency difference of the tested end B of frequency stabilization tester be set in advance equally into $\left|\frac{2.0479997952\mathrm{MHz}-2.048\mathrm{MHz}}{2.048\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively reducing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end B sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₂δ ₁, δ ₂For the maximum on the both direction allows relative frequency difference, get wherein the smaller as verification result;

1.6 the same frequency relevance ratio of frequency stabilization tester is examined and determine uncertainty:

1.6.1 equipment connects: select for use equipment to have with reference to frequency marking; To be connected to the reference edge and the tested end A of tested frequency stabilization tester with reference to the 5MHz output of frequency marking simultaneously;

1.6.2 calibrating: in the function menu of tested frequency stabilization tester panel, select " σ y (τ) ", after entering σ y (τ) submenu, sample time τ can be set as required be respectively 1ms, 10ms, 100ms, 1s, 10s, 100s, and setting and sample time corresponding measurement group number, except the group number of 10s, 100s correspondence sample time is 50 and 30, all the other are 100, press " startup " button, and frequency stabilization tester begins to measure and calculates automatically with the frequency relevance ratio uncertainty σ _y(1ms), σ _y(10ms), σ _y(100ms), σ _y(1s), σ _y(10s), σ _yMeasurement result value (100s);

1.7 the homology relevance ratio of frequency stabilization tester is examined and determine uncertainty:

1.7.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 5MHz of frequency marking output, and be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking, the 8.192MHz signal of frequency synthesizer output is connected to tested end B;

1.7.2 calibrating: in the function menu of tested frequency stabilization tester panel, select " σ y (τ) ", after entering σ y (τ) submenu, sample time τ can be set as required be respectively 1ms, 10ms, 100ms, 1s, 10s, 100s, and the corresponding measurement group of setting number with sample time, except the group number of 10s, 100s correspondence sample time is 50 and 30, all the other are 100, press " startup " button, and frequency stabilization tester begins to measure and calculate the homology relevance ratio automatically to uncertainty σ _y(1ms), σ _y(10ms), σ _y(100ms), σ _y(ls), σ _y(10s), σ _yMeasurement result value (100s).

The advantage of the invention: with the calibration method of the invention, can be to XH3596 series frequency stabilization tester calibrating in the frequency marking comparative device product, the input sensitivity, maximal phase of measuring XH3596 series frequency stabilization tester exactly to frequency difference, with relevance ratio frequently to uncertainty, homology relevance ratio to uncertainty, calibration method is simple.

Description of drawings:

Fig. 1 is the calibration equipment connection diagram of frequency marking comparative device in the national existing vertification regulation;

Fig. 2 is the tested input sensitivity calibration equipment connection diagram of XH3596 series frequency stabilization tester;

Fig. 3 is the reference input sensitivity calibration equipment connection diagram of XH3596 series frequency stabilization tester;

Fig. 4 is that the maximal phase of the tested end A of XH3596 series frequency stabilization tester is to frequency difference calibration equipment connection diagram;

Fig. 5 is that the maximal phase of the tested end B of XH3596 series frequency stabilization tester is to frequency difference calibration equipment connection diagram;

Fig. 6 is that the same frequency relevance ratio of XH3596 series frequency stabilization tester is to uncertainty calibration equipment connection diagram;

Fig. 7 is that the homology relevance ratio of XH3596 series frequency stabilization tester is to uncertainty calibration equipment connection diagram.

Embodiment:

The metering performance of XH3596 series frequency stabilization tester requires:

1), input sensitivity: (input sensitivity is defined as the minimum voltage value that makes frequency stabilization tester energy operate as normal):

With reference to input sensitivity: 0.5Vrms

Tested input sensitivity: 0.4Vrms

2), maximal phase is to frequency difference: 1 * 10 ^-7

3), same relevance ratio frequently is to uncertain: σ _y(τ)≤3 * 10 ^-12/ τ

τ is sample time

Unit is s

4), the homology relevance ratio is to uncertainty: σ _y(τ)≤5 * 10 ^-12/ τ

τ is sample time

Unit is s

5), examine and determine the equipment of selecting for use:

A, with reference to frequency marking

Output frequency is 1MHz, 5MHz, 10MHz

Frequency stability is less than or equal to 10 times of tested frequency stabilization tester comparison uncertainty

Output amplitude 〉=0.5Vrms

B, frequency synthesizer

Frequency range: 100kHz～80MHz minimum frequency resolving power: 1 μ Hz

Output level: 10mVrms～2Vrms minimum levels resolving power: 1mVrms

Output impedance: 50 Ω or high resistant

External Reference frequency marking input function is arranged

6), calibrating environmental baseline

A, environment temperature: choose wantonly a bit in 15～30 ℃, temperature variation should be above ± 2 ℃ in the verification process

B, envionmental humidity :≤80%

Though XH3596 series frequency stabilization tester does not have output terminal not monitor or to measure output terminal with equipment such as oscillograph of stipulating in the existing national verification rules or counters, but here XH3596 series frequency stabilization tester is connected with the equipment of selecting for use, utilizes frequency stabilization tester inside counting unit and microprocessor system can finish calibrating frequency stabilization tester.

The calibration method of frequency stabilization tester, its step is as follows:

1.1 the inspection of outward appearance and property working properly: tested comparative device does not have influences the damage of operate as normal, and every sign should be known complete, the gauge tap accurate positioning, and the button flexibility and reliability, socket connects firm;

1.2 the calibrating of the tested input sensitivity of frequency stabilization tester:

1.2.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported tested end A or the B that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.2.2 calibrating: the tested end A that 1MHz, 2MHz, 2.5MHz, 5MHz, the 10MHz signal of frequency synthesizer output is connected respectively to frequency stabilization tester, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given tested input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be the tested input sensitivity of A end; 2.048MHz, 4.096MHz, 8.192MHz, the 16.384MHz signal of the output of frequency synthesizer is connected respectively to the tested end B of frequency stabilization tester, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given tested input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be the tested input sensitivity of B end;

1.3 the calibrating of the reference input sensitivity of frequency stabilization tester:

1.3.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the tested end A of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported the reference edge that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.3.2 calibrating: the frequency synthesizer output frequency is changed to 1MHz, 5MHz, 10MHz respectively, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given reference input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be with reference to input sensitivity;

1.4 the maximal phase of the tested end A of frequency stabilization tester is to the calibrating of frequency difference:

1.4.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported the tested end A that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.4.2 calibrating: the 1MHz Frequency point of choosing tested end A carries out this calibrating.The output amplitude that frequency synthesizer is set is any one value in 0.4Vrms～1.5Vrms scope, with the given tested end maximal phase of tested frequency stabilization tester frequency difference technical indicator value is provided with the output frequency value of frequency synthesizer, it is 1 * 10 that technical specification provides this technical indicator ^-7, it is 1.0000001MHz that the frequency synthesizer output frequency then is set, at this moment the relative frequency difference of the tested end A of frequency stabilization tester be set in advance into $\left|\frac{1.0000001\mathrm{MHz}-1\mathrm{MHz}}{1\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively increasing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end A sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₁By same quadrat method, it is 0.9999999MHz that the frequency synthesizer output frequency is set, the relative frequency difference of at this moment tested end A be set in advance equally into $\left|\frac{0.9999999\mathrm{MHz}-1\mathrm{MHz}}{1\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively reducing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end A sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₂δ ₁, δ ₂For the maximum on the both direction allows relative frequency difference, get wherein the smaller as verification result;

1.5 the maximal phase of the tested end B of frequency stabilization tester is to the calibrating of frequency difference:

1.5.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester front panel with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer is exported the tested end B that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.5.2 calibrating: the 2.048MHz Frequency point of choosing tested end B carries out this calibrating.The output amplitude that frequency synthesizer is set is 0.4V _Rms～1.5V _RmsAny one value in the scope is provided with the output frequency value of frequency synthesizer with the given tested end maximal phase of tested frequency stabilization tester to frequency difference technical indicator value, and providing this technical indicator in the technical specification is 1 * 10 ^-7, the output frequency that frequency synthesizer then is set is 2.0480002048MHz, at this moment the relative frequency difference of the tested end B of frequency stabilization tester be set in advance into $\left|\frac{2.0480002048\mathrm{MHz}-2.048\mathrm{MHz}}{2.048\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively increasing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end B sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₁By same quadrat method, the output frequency that frequency synthesizer is set is 2.0479997952MHz, at this moment the relative frequency difference of the tested end B of frequency stabilization tester be set in advance equally into $\left|\frac{2.0479997952\mathrm{MHz}-2.048\mathrm{MHz}}{2.048\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively reducing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end B sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₂δ ₁, δ ₂For the maximum on the both direction allows relative frequency difference, get wherein the smaller as verification result;

1.6 the same frequency relevance ratio of frequency stabilization tester is examined and determine uncertainty:

1.6.1 equipment connects: select for use equipment to have with reference to frequency marking; To be connected to the reference edge and the tested end A of tested frequency stabilization tester with reference to the 5MHz output of frequency marking simultaneously;

1.6.2 calibrating: in the function menu of tested frequency stabilization tester panel, select " σ y (τ) ", after entering σ y (τ) submenu, sample time τ can be set as required be respectively 1ms, 10ms, 100ms, 1s, 10s, 100s, and setting and sample time corresponding measurement group number, except the group number of 10s, 100s correspondence sample time is 50 and 30, all the other are 100, press " startup " button, and frequency stabilization tester begins to measure and calculates automatically with the frequency relevance ratio uncertainty σ _y(1ms), σ _y(10ms), σ _y(100ms), σ _y(1s), σ _y(10s), σ _yMeasurement result value (100s);

1.7 the homology relevance ratio of frequency stabilization tester is examined and determine uncertainty:

1.7.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 5MHz of frequency marking output, and be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking, the 8.192MHz signal of frequency synthesizer output is connected to tested end B;

1.7.2 calibrating: in the function menu of tested frequency stabilization tester panel, select " σ y (τ) ", after entering σ y (τ) submenu, sample time τ can be set as required be respectively 1ms, 10ms, 100ms, 1s, 10s, 100s, and the corresponding measurement group of setting number with sample time, except the group number of 10s, 100s correspondence sample time is 50 and 30, all the other are 100, press " startup " button, and frequency stabilization tester begins to measure and calculate the homology relevance ratio automatically to uncertainty σ _y(1ms), σ _y(10ms), σ _y(100ms), σ _y(1s), σ _y(10s), σ _yMeasurement result value (100s).

Do not have the homology relevance ratio in the existing rules to the uncertainty calibration method, because the frequency marking comparative device that rules are surveyed has only a tested input end, incoming frequency value 5MHz or 10MHz can be provided by the reference frequency marking usually when measuring the comparison uncertainty; And XH3596 series frequency stabilization tester has two tested input end A and B, when measuring the comparison uncertainty, A end incoming frequency value 5MHz or 10MHz can be provided by the reference frequency marking, B end incoming frequency value is 2.048MHz, 4.096MHz, 8.192MHz, 16.384MHz, can not provide by the reference frequency marking, can only be external with reference to synthetic output after the frequency marking by frequency synthesizer.Therefore the homology relevance ratio of this method is to provide calibration method to existing rules to the calibrating of uncertainty.

Following table is the calibrating data at a frequency stabilization tester in the XH3596 series

Claims (1)

1. the calibration method of frequency stabilization tester, its step is as follows:

1.1 the inspection of outward appearance and property working properly: tested comparative device does not have influences the damage of operate as normal, and every sign should be known complete, the gauge tap accurate positioning, and the button flexibility and reliability, socket connects firm;

1.2 the calibrating of the tested input sensitivity of frequency stabilization tester:

1.2.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported tested end A or the B that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.2.2 calibrating: the tested end A that 1MHz, 2MHz, 2.5MHz, 5MHz, the 10MHz signal of frequency synthesizer output is connected respectively to frequency stabilization tester, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given tested input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be the tested input sensitivity of A end; 2.048MHz, 4.096MHz, 8.192MHz, the 16.384MHz signal of the output of frequency synthesizer is connected respectively to the tested end B of frequency stabilization tester, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given tested input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be the tested input sensitivity of B end;

1.3 the calibrating of the reference input sensitivity of frequency stabilization tester:

1.3.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the tested end A of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported the reference edge that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.3.2 calibrating: the frequency synthesizer output frequency is changed to 1MHz, 5MHz, 10MHz respectively, the output amplitude of frequency synthesizer is that starting point progressively increases with 1/10th of the given reference input sensitivity index of tested frequency stabilization tester, observe the reading of the frequency accuracy " Δ f/f " that the inner counting unit of tested frequency stabilization tester records, normal up to this reading, write down the output amplitude value of frequency synthesizer, be with reference to input sensitivity;

1.4 the maximal phase of the tested end A of frequency stabilization tester is to the calibrating of frequency difference:

1.4.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer will be exported the tested end A that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.4.2 calibrating: the 1MHz Frequency point of choosing tested end A carries out this calibrating.The output amplitude that frequency synthesizer is set is any one value in 0.4Vrms～1.5Vrms scope, with the given tested end maximal phase of tested frequency stabilization tester frequency difference technical indicator value is provided with the output frequency value of frequency synthesizer, it is 1 * 10 that technical specification provides this technical indicator ^-7, it is 1.0000001MHz that the frequency synthesizer output frequency then is set, at this moment the relative frequency difference of the tested end A of frequency stabilization tester be set in advance into $\left|\frac{1.0000001\mathrm{MHz}-1\mathrm{MHz}}{1\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively increasing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end A sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₁By same quadrat method, it is 0.9999999MHz that the frequency synthesizer output frequency is set, the relative frequency difference of at this moment tested end A be set in advance equally into $\left|\frac{0.9999999\mathrm{MHz}-1\mathrm{MHz}}{1\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively reducing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end A sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₂δ ₁, δ ₂For the maximum on the both direction allows relative frequency difference, get wherein the smaller as verification result;

1.5 the maximal phase of the tested end B of frequency stabilization tester is to the calibrating of frequency difference:

1.5.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester front panel with reference to the 10MHz output of frequency marking, the signal of frequency synthesizer is exported the tested end B that is connected to tested frequency stabilization tester, will be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking;

1.5.2 calibrating: the 2.048MHz Frequency point of choosing tested end B carries out this calibrating.The output amplitude that frequency synthesizer is set is 0.4V _Rms～1.5V _RmsAny one value in the scope is provided with the output frequency value of frequency synthesizer with the given tested end maximal phase of tested frequency stabilization tester to frequency difference technical indicator value, and providing this technical indicator in the technical specification is 1 * 10 ^-7, the output frequency that frequency synthesizer then is set is 2.0480002048MHz, at this moment the relative frequency difference of the tested end B of frequency stabilization tester be set in advance into $\left|\frac{2.0480002048\mathrm{MHz}-2.048\mathrm{MHz}}{2.048\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively increasing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end B sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₁By same quadrat method, the output frequency that frequency synthesizer is set is 2.0479997952MHz, at this moment the relative frequency difference of the tested end B of frequency stabilization tester be set in advance equally into $\left|\frac{2.0479997952\mathrm{MHz}-2.048\mathrm{MHz}}{2.048\mathrm{MHz}}\right|=1\×{10}^{-7},$ The absolute value of observing " Δ f/f " that the inner counting unit of tested frequency stabilization tester records should equal the value of setting in advance 1 * 10 ^-7, progressively reducing the output frequency of frequency synthesizer then, the absolute value of " the Δ f/f " that shows up to frequency stabilization tester is not equal to the relative frequency difference value that tested end B sets in advance, and the relative frequency difference value when writing down last subnormal demonstration is made as δ ₂δ ₁, δ ₂For the maximum on the both direction allows relative frequency difference, get wherein the smaller as verification result;

1.6 the same frequency relevance ratio of frequency stabilization tester is examined and determine uncertainty:

1.6.1 equipment connects: select for use equipment to have with reference to frequency marking; To be connected to the reference edge and the tested end A of tested frequency stabilization tester with reference to the 5MHz output of frequency marking simultaneously;

1.6.2 calibrating: in the function menu of tested frequency stabilization tester panel, select " σ y (τ) ", after entering σ y (τ) submenu, sample time τ can be set as required be respectively 1ms, 10ms, 100ms, 1s, 10s, 100s, and setting and sample time corresponding measurement group number, except the group number of 10s, 100s correspondence sample time is 50 and 30, all the other are 100, press " startup " button, and frequency stabilization tester begins to measure and calculates automatically with the frequency relevance ratio uncertainty σ _y(1ms), σ _y(10ms), σ _y(100ms), σ _y(1s), σ _y(10s), σ _yMeasurement result value (100s);

1.7 the homology relevance ratio of frequency stabilization tester is examined and determine uncertainty:

1.7.1 equipment connects: select for use equipment to have with reference to frequency marking, frequency synthesizer; To be connected to the reference edge of tested frequency stabilization tester with reference to the 5MHz of frequency marking output, and be connected to the External Reference input end of frequency synthesizer with reference to the 10MHz output of frequency marking, the 8.192MHz signal of frequency synthesizer output is connected to tested end B;

1.7.2 calibrating: in the function menu of tested frequency stabilization tester panel, select " σ y (τ) ", after entering σ y (τ) submenu, sample time τ can be set as required be respectively 1ms, 10ms, 100ms, 1s, 10s, 100s, and the corresponding measurement group of setting number with sample time, except the group number of 10s, 100s correspondence sample time is 50 and 30, all the other are 100, press " startup " button, and frequency stabilization tester begins to measure and calculate the homology relevance ratio automatically to uncertainty σ _y(1ms), σ _y(10ms), σ _y(100ms), σ _y(1s), σ _y(10s), σ _yMeasurement result value (100s).

Images