CN102262187B - Device and method for testing and compensating frequency characteristics of power sensor - Google Patents
Device and method for testing and compensating frequency characteristics of power sensor Download PDFInfo
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Abstract
The invention relates to a device and a method for testing and compensating, in particular to a device and a method for testing and compensating frequency characteristics of a power sensor. The device comprises a frequency characteristic tester and a power sensor testing and compensating small box. Resistance and capacitance jacks of a debugging and compensating network and diode jacks X5 and X6 are arranged on a panel of the testing and compensating small box. A radio frequency connector is arranged on the small box near the side surfaces of the jacks of the debugging and compensating network. The radio frequency connector is connected with a high-frequency signal output end of the frequency characteristic tester. A direct current output connector is arranged on a side surface near the diode jacks. The direct current output connector is connected with an input end of a frequency characteristic tester. An input end of the debugging and compensating network is connected with the radio frequency connector. An output end of the debugging and compensating network is connected with the diode jack X5. The diode jack X6 is connected with the direct current output connector. According to the device and the method disclosed by the invention, a high-efficiency solution for designing and debugging the power sensor is provided; the debugging problem is reduced; and properties of products are improved.
Description
Technical field
The present invention relates to a kind of test compensation system and method thereof, particularly a kind of power sensor frequency characteristic test compensation system and method thereof for high-power transmitter.
Background technology
The detection of high-power transmitter output power is very important to the normal operation of transmitter and protection.Conventionally output terminal access directional coupler or the voltage divider at transmitter takes out suitable high frequency output signal, after corrective network, by detector diode, is transformed into d. c. voltage signal, then delivers to indicating circuit or microprocessor is processed.Before entering practicality, must carry out to detector diode and compensating circuit thereof debugging and the calibration of pointing accuracy and frequency response.This need to carry out conventionally on complete machine.First transmitter is received in the fictitious load of corresponding power by the power detection instrument of a station symbol standard, then outputed rated power, respectively the performance number of the power of recorder indication and the machine indication.In operating frequency range, at least to open more than 10 Frequency points, just can find out the variation tendency of frequency characteristic.By adjusting the parameter of corrective network circuit component, adjust the frequency response of detecting circuit, by adjusting detecting circuit voltage divider afterwards, calibrate its pointing accuracy.To the debugging of frequency response, sometimes carry out very smoothly, sometimes but quite difficult, no matter how the parameter of corrective network is adjusted, be all difficult to obtain desirable result.
High-power transmitter generally adopts directional coupler as power detection module, for power indication and the fault detect of transmitter.Directional coupler can adopt different detections and accessory circuit thereof, but its detection principle is basic identical, for more intuitive understanding, we are referred to as " power sensor " by directional coupler or other high frequency sampling circuit together with their detection and accessory circuit (corrective network) thereof.As shown in Figure 1, mainly by radio frequency sampling circuit 1, corrective network 2 and detection and filtering circuit 3 three parts form the typical circuit structure of existing directional coupler power detection module.The current transformer M that radio frequency sampling 1 consists of inductance L 1 and the voltage divider sample circuit that comprises capacitor C 1, C2 form.Through suitable parameter adjustment, the high-frequency signal that after two kinds of sampled signal stacks, output is directly proportional to incident wave or reflection wave.The high-frequency signal of radio frequency sampling circuit output is through diode V1 detection, then the filtering circuit forming through C4, R4 is delivered to DC meter to show the power of transmitter after level and smooth.Inconsistency due to diode junction capacitance and other parameter, the detection frequency characteristic of different diodes differs very large, what have is level, being of having risen or declined, and the amplitude that rises or decline is not identical yet, need between sample circuit and detector diode V1, a corrective network be set and adjust.Corrective network generally consists of divider resistance R3, R4 and building-out capacitor C3.Its essence is by RC parallel circuit the high-frequency signal of different frequency is had to different resistance values, thereby frequency high-side signal is promoted to compensation (detection characteristic of supposition diode itself is high-end decline).Finally make the signal demodulator output amplitude of different frequency consistent.Inconsistency due to the detection frequency characteristic of diode, this corrective network cannot be designed to the circuit of unified parameter, can only be powered on and be debugged preparation by start, and need frequency one by one to debug and measure, comprise and change resistance, electric capacity, even detector diode.The length of debug time, power consumption is big, well imagines, and need to have abundant commissioning experience.And existing diode standard there is no the index of relevant detection frequency characteristic, more without the method and apparatus of test diode detection frequency characteristic.
Along with high-power transmitter is more and more higher to the requirement of power sensor accuracy of detection and direct current detection frequency characteristic, existing design, debugging technique have been difficult to meet the needs of production and debugging.Therefore need a kind of new method that comprises design, processing and manufacturing and debugging technique, in order to improve the properties of product of the power sensor in directional coupler, and improve production efficiency.
Because the above-mentioned defect that above-mentioned existing high-power transmitter exists during power sensor is produced, the design people is based on being engaged in this type of product design manufacture abundant practical experience and professional knowledge for many years, and coordinate the utilization of test philosophy, positive research and innovation in addition, to founding a kind of power sensor frequency characteristic test compensation system and method thereof, in order to strengthen the properties of product of power sensor, and improve production efficiency.Through constantly research, design, and after repeatedly studying sample and improving, finally create the present invention who has practical value.
Summary of the invention
Technical matters to be solved by this invention is, for the above-mentioned deficiency of prior art, to provide a kind of power sensor frequency characteristic test compensation system and method thereof.
The technical matters of object of the present invention and solution is to adopt following technical scheme to realize.A kind of power sensor frequency characteristic test compensation system proposing according to the present invention, comprise frequency-characteristic measuring-testing instrument and power sensor test compensation capsule (being called for short test compensation capsule), the panel of described test compensation capsule is provided with resistance and the electric capacity jack of debugging corrective network, diode jack X5, X6; In described capsule, be also provided with input impedance matching circuit, filter network; Described capsule is provided with the radio frequency connector of the high-frequency signal output terminal that connects described frequency-characteristic measuring-testing instrument near the jack side of debugging corrective network; Near diode jack side, be provided with the direct current out connector of the input end that connects described frequency-characteristic measuring-testing instrument; The input end of described debugging corrective network connects described radio frequency connector by described input impedance matching circuit, and its output terminal connects described diode jack X5, and described diode jack X6 connects and connects described direct current out connector by described filter network.
Power sensor frequency characteristic test compensation system of the present invention can also be further achieved by the following technical measures.
Aforesaid power sensor frequency characteristic test compensation system, wherein said frequency-characteristic measuring-testing instrument is sweep generator or scalar network analyzer, and the frequency range of a. instrument must cover the operating frequency range of detecting circuit; B. instrument must be provided with detection input interface outside at least one road; C. the vertical resolution of instrument display is better than every lattice 1dB.
Aforesaid power sensor frequency characteristic test compensation system, is also provided with hilted broadsword two position conversion switch S1, double-pole two position conversion switch S2 on the panel of wherein said test compensation capsule, is also provided with reference diode in described capsule.The lock seat S1-1 of the output order cutter two position conversion switch S1 of described debugging corrective network, the tool rest S1-3 of described hilted broadsword two position conversion switch S1 connects described diode jack X5, and the lock seat S1-2 of described hilted broadsword two position conversion switch S1 connects described input impedance matching circuit; Described reference diode is in parallel with described diode jack X5, X6 by described double-pole two position conversion switch S2.
Aforesaid power sensor frequency characteristic test compensation system, the radio frequency connector of wherein said test compensation capsule is the radio frequency socket of N-type or BNC type or other type; Described direct current out connector is BNC socket or independent binding post or other terminal formation.
Aforesaid power sensor frequency characteristic test compensation system, wherein said reference diode is in high-power transmitter operating frequency range, to have the detector diode that approaches horizontal frequency characteristic.
The present invention also provides a kind of method of using said apparatus to carry out the compensation of power sensor frequency characteristic test, comprises the following steps:
1-1 test prepares to connect sweep generator and test compensation capsule, on test compensation capsule, between X5, X6 jack, do not take over what diode, double-pole two position conversion switch S2 are by reference diode place in circuit, hilted broadsword two position conversion switch S1 select test to connect input matching network, the detection frequency characteristic of test diode;
1-2 instrument arranges swept-frequency signal output attenuatoin 0dB, and swept frequency range is set as working frequency range, and vertical resolution is selected 1dB/ degree;
1-3 adjusts the perpendicular displacement knob of sweep generator input signal, and input signal curve is moved on to correct position, and the low side of curve is alignd with certain horizontal scale line;
If the high low side response error of 1-4 analysis and judgement curve, within 0.5dB, illustrates that instrument and whole test macro are working properly, can carry out next step; If do not have curve to occur, or the curve error showing is very bad, expression system breaks down, and need to check that whether tie cable is reliable, and whether instrument breaks down, and after fixing a breakdown, carries out next step;
1-5 checks that the whether normal hilted broadsword two position conversion switch S1 of corrective network path are by corrective network place in circuit, and by capacitor and divider resistance access corrective network, regulating capacitor, should be able to be transferred to level by response detection frequency family curve; If regulate variable condenser inoperative or adjust less than smooth, belong to fault, should check that whether the contact of each element of corrective network is good, whether parameter is accurate, and fault is got rid of;
2-1 disconnects reference diode and corrective network, inserts measured diode and measured diode is inserted to diode jack X5 and the X6 of test compensation system, by switch S 2, reference diode is disconnected; Switch S 1 is selected test, and obstructed over-compensation network directly connects input impedance matching circuit;
2-2 measures the measured diode detection frequency family curve of not compensated, and concrete method of adjustment is with step 1-3;
The curve tilt condition that 2-3 shows according to sweep generator, judges that whether measured diode frequency characteristic is qualified, qualified, enters step 3; Defective, get back to the measured diode that 2-1 more renews;
The frequency response curve shape that step 3, the parameter of determining each element of corrective network show according to sweep generator and high, the minimum difference in frequency range, choose suitable capacitance resistance parameter, makes the curve after compensation approach level.
The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, power sensor frequency characteristic test compensation system of the present invention and method thereof can reach suitable technical progress and practicality, and have the extensive value in industry, and it at least has following advantages:
1, the screening that power sensor frequency characteristic test compensation system of the present invention is high frequency detection diode provides means of testing, can be cost-saving aspect the buying of components and parts, avoid waste; Aspect the production of power sensor, can shorten components and parts delivery cycle, the construction delay that the components and parts of avoiding purchasing on a barter basis cause.For the design of power sensor, debugging provide efficient solution, reduced debugging difficulty, improved properties of product.Through comprehensive, analyze, high-power transmitter power sensor test macro has very high economic and social benefit.
2, the design that power sensor frequency characteristic test compensation system of the present invention and method thereof are power sensor, former device screening and high-power transmitter output response debugging provide total solution.
3, to the debugging of directional coupler direct current detection frequency response, can only on transmitter, carry out, the independent debug system of the disengaging transmitter that the present invention develops, more can adapt to the needs of mass production in the past.The detecting circuit of directional coupler is transplanted in test accessories, detecting circuit is detected and debugged.After having debugged, a whole set of power sensor that comprises diode and corrective network thereof is installed in directional coupler, reinstalls transmitter and verify.The debugging that can only carry out on high-power transmitter before making like this can be transferred on small-signal instrument and carry out, and has saved a large amount of human and material resources and electric energy, has reduced production cost.
In sum, power sensor frequency characteristic test compensation system of the present invention and method thereof have above-mentioned plurality of advantages and practical value, there is technically significant progress, and produced handy and practical effect, and the outstanding multinomial effect compared with prior art with enhancement, thereby being more suitable for practicality, and having the extensive value of industry, is really a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, for better understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above and other object of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing directional coupler and power detection module.
Fig. 2 is detecting circuit frequency characteristic test installation drawing of the present invention
Fig. 3 is power sensor frequency characteristic test compensation system test system block diagram of the present invention.
Fig. 4 is power sensor frequency characteristic test compensation method process flow diagram of the present invention.
Fig. 5 is the test curve figure of reference diode, measured diode compensation front and back to Figure 10.
Embodiment
Relevant aforementioned and other technology contents of the present invention, Characteristic can clearly present in the following detailed description coordinating with reference to graphic preferred embodiment.By the explanation of embodiment, when can be to reach technological means and the effect that predetermined object takes to obtain one more deeply and concrete understanding to the present invention, yet appended graphic being only to provide with reference to the use with explanation be not used for the present invention to be limited.
Refer to shown in Fig. 2, Fig. 3, a kind of power sensor frequency characteristic test compensation system provided by the present invention, comprise frequency-characteristic measuring-testing instrument 10 and power sensor test compensation capsule 20 as test, the panel 21 of wherein said test compensation capsule 20 is provided with resistance and the electric capacity jack 22 of debugging corrective network 30, the jack of two groups of multipair debugging corrective network elements specifically, every pair of jack all can insert resistance R 2, R3, capacitor C 3.On the panel of test compensation capsule, be also provided with measured diode jack X5 and X6; Described capsule is provided with radio frequency connector XS1 near the side of corrective network jack, for connecting the high-frequency signal output interface of described frequency-characteristic measuring-testing instrument, near measured diode jack side, be provided with direct current rectified signal out connector XS2 (BNC socket or 2mm contact pin, two kinds of output interface forms can be optionally), for connecting the input interface of described frequency-characteristic measuring-testing instrument; In described capsule, be provided with input impedance matching circuit and filtering circuit, the output impedance of described input impedance matching circuit and frequency-characteristic measuring-testing instrument matches.The input end of described corrective network connects described radio frequency connector XS1, and the other end connects described diode jack X5, and described diode jack X6 meets direct current out connector XS2 by described filtering circuit.
While detecting the detection frequency characteristic of diode, tested detector diode is inserted to diode jack X5, X6, jack with short-circuit line short circuit corrective network element, make the positive pole of tested detector diode by the high-frequency signal output interface of described input matching circuit rate of connections characteristic tester, the negative pole of tested detector diode connects the input interface of frequency-characteristic measuring-testing instrument, tested detector diode is carried out to preliminary survey qualified to judge whether, then according to tested detector diode preliminary survey result, select the resistance R 2 of the corrective network of certain parameter, R3 and capacitor C 3, insert respectively in the described resistance and electric capacity jack on the little box panel of test compensation, compensate, adjust component parameters, make the frequency characteristic of power sensor approach level.After having debugged, a whole set of power sensor that comprises diode and corrective network thereof is installed in directional coupler, reinstalls transmitter and verify.Make the debugging that can only carry out on high-power transmitter, transfer on small-signal instrument and carry out, saved a large amount of human and material resources and electric energy, reduced production cost.Concrete test and compensation will be described in detail in aftermentioned method.
Described frequency-characteristic measuring-testing instrument is sweep generator or scalar network analyzer, and the frequency range of a. instrument must cover the operating frequency range of detecting circuit; B. instrument must be provided with detection input interface outside at least one road; C. the vertical resolution of instrument display is better than every lattice 1dB.
For improving debugging speed, reduce the plug-in mounting time, avoid standard compensation network and reference diode to lose, on the panel of described test compensation capsule, be also provided with hilted broadsword two position conversion switch S1, double-pole two position conversion switch S2, in described capsule, be also provided with reference diode.The lock seat S1-1 of the output order cutter two position conversion switch S1 of described debugging corrective network, the tool rest S1-3 of described hilted broadsword two position conversion switch S1 connects described diode jack X5, and the lock seat S1-2 of described hilted broadsword two position conversion switch S1 connects described input impedance matching circuit; Described reference diode is in parallel with described diode jack X5, X6 by described double-pole two position conversion switch S2.By switching over, can detect debugging work.
The radio frequency connector of described test compensation capsule is the radio frequency socket of N-type or BNC type or other type; Described direct current out connector is BNC socket or independent binding post or other terminal formation.
Described reference diode is in high-power transmitter operating frequency range, to have the detector diode that approaches horizontal frequency characteristic.
Power sensor frequency characteristic test compensation system of the present invention, while being used as the detection frequency characteristic that detects measured diode, first do not access this diode, by the resistance R of reference diode V1 and corrective network 2, R3 and variable capacitance C3 access, sweep generator and whole test macro are calibrated.And then measured diode is replaced to reference diode and insert in diode jack X5, X6, with sweep generator, detect the frequency characteristic of measured diode, can also this screening as high frequency detection diode.
Refer to Fig. 4 the present invention a kind of method of using said apparatus to carry out the compensation of power sensor frequency characteristic test be also provided, comprise the following steps:
1-1 test prepares to connect sweep generator and test compensation capsule, on test compensation capsule, between X5, X6 jack, do not take over what diode, double-pole two position conversion switch S2 are by reference diode place in circuit, hilted broadsword two position conversion switch S1 select test to connect input matching network, directly the detection frequency characteristic of test benchmark diode;
1-2 instrument arranges swept-frequency signal output attenuatoin 0dB, and swept frequency range is set as working frequency range, and vertical resolution is selected 1dB/ degree;
1-3 adjusts the perpendicular displacement knob of sweep generator input signal, and input signal curve is moved on to correct position, and the low side of curve is alignd with certain horizontal scale line; The detection frequency characteristic of the reference diode of measuring as shown in Figure 5;
If the high low side response error of 1-4 analysis and judgement curve, within 0.5dB, illustrates that instrument and whole test macro are working properly, can carry out next step; If do not have curve to occur, or the curve error showing is very bad, expression system breaks down, and need to check that whether tie cable is reliable, and whether instrument breaks down, and after fixing a breakdown, carries out next step;
1-5 checks that the whether normal hilted broadsword two position conversion switch S1 of corrective network path are by corrective network place in circuit, by in capacitor and divider resistance access corrective network, regulating capacitor, can be transferred to level (as shown in Figure 6) by response detection frequency family curve; If regulate variable condenser inoperative or adjust less than smooth, belong to fault, should check that whether the contact of each element of corrective network is good, fault is got rid of;
2-1 disconnects reference diode and corrective network, inserts measured diode and measured diode is inserted to diode jack X5 and the X6 of test compensation system, by switch S 2, reference diode is disconnected; Switch S 1 is selected test, and obstructed over-compensation network directly connects input impedance matching circuit;
2-2 measures the measured diode detection frequency family curve of not compensated, and concrete method of adjustment is with step 1-3;
The curve tilt condition that 2-3 shows according to sweep generator, judges that whether measured diode frequency characteristic is qualified, qualified, enters step 3; Defective, get back to the measured diode that 2-1 more renews; Judge whether that qualified standard rule of thumb requires to determine with batch and the accuracy of detection of task.Fig. 7, Fig. 9 show respectively the characteristic example of the detection frequency of qualified and defective diode.
The frequency response curve shape that step 3, the parameter of determining each element of corrective network show according to sweep generator and high, the minimum difference in frequency range, choose suitable capacitance resistance parameter, makes the curve after compensation approach level.
For qualified detector diode.In corrective network, in the jack in parallel with R2, insert the capacitor C3 of different capabilities, just can change the slope of response curve.(value of resistance R 2 and R3 is that rule of thumb data in advance is determined, applicable great majority are identified as qualified detector diode); Specifically, the curve shape showing according to sweep generator and high, the minimum difference in frequency range, select a suitable capacitor, makes slope of a curve minimum, as shown in Figure 8 the detection characteristic curve after qualified diode compensation.At this moment the parameter of each element of corrective network is substantially definite.
For defective diode, also can, by compensation, reach the level of approaching.If measured diode detection frequency characteristic is very poor or be identified as defectively, no matter change the building-out capacitor of which kind of numerical value, the error of response curve is still very large, or does not change.At this moment will change the value of adjusting again building-out capacitor after the ratio of divider resistance.This work need be carried out repeatedly repeatedly, even also needs to access compensating inductance.Generally, always can find out the network parameter that is suitable for this diode.This step under extreme conditions can be used as the solution that power sensor frequency characteristic compensation network parameter is adjusted, but in the situation that producing in batches or multiple devices are had to higher coherence request, debugging difficulty is very high, and production efficiency is very low.Figure 10 is the detection characteristic curve after defective diode compensation.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (5)
1. a power sensor frequency characteristic test compensation system, it is characterized in that comprising frequency-characteristic measuring-testing instrument and power sensor test compensation capsule, the panel of described test compensation capsule is provided with resistance jack and the electric capacity jack of debugging corrective network, diode jack X5, X6; In described capsule, be provided with input impedance matching circuit, filter network, debugging corrective network, reference diode; Described capsule is provided with the radio frequency connector of the high-frequency signal output terminal that connects described frequency-characteristic measuring-testing instrument near the jack side of debugging corrective network; Near diode jack side, be provided with the direct current out connector of the input end that connects described frequency-characteristic measuring-testing instrument; The input end of described debugging corrective network connects described radio frequency connector by described input impedance matching circuit, and its output terminal connects described diode jack X5, and described diode jack X6 connects described direct current out connector by described filter network; On the panel of described test compensation capsule, be also provided with hilted broadsword two position conversion switch S1, double-pole two position conversion switch S2; The lock seat S1-1 of the output order cutter two position conversion switch S1 of described debugging corrective network, the tool rest S1-3 of described hilted broadsword two position conversion switch S1 connects described diode jack X5, and lock seat S1-2 of described hilted broadsword two position conversion switch S1 connect described input impedance matching circuit; Described reference diode is in parallel with described diode jack X5, X6 by described double-pole two position conversion switch S2.
2. power sensor frequency characteristic test compensation system according to claim 1, it is characterized in that described frequency-characteristic measuring-testing instrument is sweep generator or scalar network analyzer, and the frequency range of a. instrument must cover the operating frequency range of detecting circuit; B. instrument must be provided with detection input interface outside at least one road; C. the vertical resolution of instrument display is better than every lattice 1dB.
3. power sensor frequency characteristic test compensation system according to claim 1, is characterized in that the radio frequency connector of described test compensation capsule is the radio frequency socket of N-type or BNC type or other type; Described direct current out connector is BNC socket or independent binding post or other terminal formation.
4. power sensor frequency characteristic test compensation system according to claim 1, is characterized in that described reference diode is in high-power transmitter operating frequency range, to have the detector diode that approaches horizontal frequency characteristic.
5. the method that the power sensor frequency characteristic test compensation system of one of right to use requirement 1-4 carries out the compensation of power sensor frequency characteristic test, comprises the following steps:
Step 1, calibration test system are tested with reference diode, then by debugging corrective network, whole test macro are carried out to detection calibration, comprising:
1-1 tests preparation, connect sweep generator and test compensation capsule, on test compensation capsule, between X5, X6 jack, do not take over what diode, double-pole two position conversion switch S2 are by reference diode place in circuit, hilted broadsword two position conversion switch S1 select test to connect input impedance matching circuit, the detection frequency characteristic of test diode;
1-2 instrument arranges, swept-frequency signal output attenuatoin 0dB, and swept frequency range is set as working frequency range, and vertical resolution is selected 1dB/ degree;
1-3 adjusts the perpendicular displacement knob of sweep generator input signal, and the curve of input signal is moved on to correct position, and the low side of curve is alignd with certain horizontal scale line;
1-4 analyzes and judgement, if the high low side response error of curve, within 0.5dB, illustrates that power sensor frequency characteristic test compensation system and whole test macro are working properly, carries out next step; If do not have curve to occur, or the curve error showing is very bad, expression system breaks down, and need to check that whether tie cable is reliable, and whether instrument breaks down, and after fixing a breakdown, carries out next step;
1-5 checks that whether debugging corrective network path is normal, and hilted broadsword two position conversion switch S1 will debug corrective network place in circuit, and by capacitor and divider resistance access debugging corrective network, regulating capacitor, is transferred to level by the curve of response detection frequency characteristic; If regulate variable condenser inoperative or adjust less than smooth, belong to fault, check that whether the contact of each element of debugging corrective network is good, whether parameter is accurate, and fault is got rid of;
Step 2, detection measured diode detection frequency characteristic
2-1 disconnects reference diode and debugging corrective network, inserts measured diode, measured diode is inserted to diode jack X5 and the X6 of test compensation system, by switch S 2, reference diode is disconnected; By switch S 1, select to realize measured diode and by debugging corrective network, directly do not connect input impedance matching circuit;
2-2 measures the curve of the measured diode detection frequency characteristic of not compensated, and concrete method of adjustment is with step 1-3;
The curve tilt condition that 2-3 shows according to sweep generator, judges that whether measured diode frequency characteristic is qualified, qualified, enters step 3; Defective, get back to the measured diode that 2-1 more renews;
The parameter of step 3, definite each element of debugging corrective network, the curve shape of the frequency response showing according to sweep generator and high, the minimum difference in frequency range, choose suitable capacitance resistance parameter, makes the curve after compensation approach level.
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| CN2246809Y (en) * | 1996-05-16 | 1997-02-05 | 哈尔滨工程大学 | Super low-frequency response tester |
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