CN105785206A - System and method for testing pass-bands of multichannel frequency converter - Google Patents
System and method for testing pass-bands of multichannel frequency converter Download PDFInfo
- Publication number
- CN105785206A CN105785206A CN201610327836.1A CN201610327836A CN105785206A CN 105785206 A CN105785206 A CN 105785206A CN 201610327836 A CN201610327836 A CN 201610327836A CN 105785206 A CN105785206 A CN 105785206A
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- power
- converter
- multichannel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
Abstract
The invention discloses a system and method for testing pass-bands of a multichannel frequency converter. The test system comprises a local oscillating signal generation device, an adjustable signal generation device and a signal power frequency detection device which have identical reference clocks; the local oscillating signal generation device outputs local oscillating signals to a multichannel frequency converter and is used for providing local oscillating signals for the multichannel frequency converter; the frequency and power values of the oscillating signals are obtained through the detecting of the signal power frequency detection device; the adjustable signal generation device generates signals with adjustable frequency and then outputs the signals to the multichannel frequency converter; when the signal power frequency detection device detects that the power of the multiple frequency converter output signals is within a preset power threshold range, a pass-band of the multichannel frequency converter is tested and obtained; the frequency of the local oscillating signal is used as the center frequency for the signals generated by the adjustable signal generation device.
Description
Technical field
The invention belongs to testing for electrical equipment field, particularly relate to passband test system and the method thereof of a kind of multichannel converter.
Background technology
Currently for the test of the multichannel converter passband of frequency microwave frequency range, it is generally adopted vector network analyzer and tests, as shown in Figure 1.Multiport vector network analyzer provides pumping signal and local oscillation signal, receives the output signal of multichannel converter simultaneously.Before test, it is necessary to the operating frequency range of vector network analyzer, output size and number of scan points etc. are set according to the performance indications of tested multichannel converter, then re-use calibrating device and each passage is calibrated.After having calibrated, the excitation input port of measured piece is attached with another source port of vector network analyzer source port, output port and vector network analyzer receiver port, local oscillator input port and vector network analyzer.The ratio of output signal and the pumping signal of input of frequency-variable module is transmission response, according to the method for above-mentioned introduction, can obtain the indexs such as bandwidth by transmission response curve carries out data process in certain frequency range.
But existing employing vector network analyzer is tested, test is required for carrying out the calibration of complexity every time, and calibration process is loaded down with trivial details and the time is long.Meanwhile, vector network analyzer is expensive, but also to match frequency deviation or frequency mixer test option just can test, use cost is significantly high.
Summary of the invention
In order to solve the shortcoming of prior art, the present invention provides a kind of passband test system and the method thereof of multichannel converter.Wherein, this test system of the present invention adopts conventional test instrunment, reduce that testing cost is low and test accurately；The method adopts frequency step dynamically to regulate and frequency step direction automatic adjustment technologies, it is possible to increase test speed, moreover it is possible to ensure measuring accuracy.
For achieving the above object, the present invention is by the following technical solutions:
The passband test system of a kind of multichannel converter, including the identical local oscillation signal generating means of reference clock, adjustable signal generating device and signal power frequency detecting device；
Described local oscillation signal generating means output local oscillation signal at most channel frequency converter, for providing local oscillation signal for multichannel converter, obtains frequency and the performance number of local oscillation signal after signal power frequency detecting device detects；
Described adjustable signal generating device produces the signal of frequency dynamic adjustment and exports at most channel frequency converter, the power of the output signal of the multichannel converter detected when signal power frequency detecting device is in predetermined power threshold range, and test obtains the passband of multichannel converter；Signal frequency centered by the frequency of local oscillation signal that described adjustable signal generating device produces.
Described predetermined power threshold range is local oscillation signal performance number-3dBm ± default error power value.So can determine that measuring accuracy sets requirement so that in cut-off frequency search procedure, the test signal power size of side frequency point is compared automatically, it is thus possible to automatically adjust frequency step direction.
The signal that described adjustable signal generating device produces dynamically regulates with predeterminated frequency equivalence interval.This test system of such present invention can set requirement according to measuring accuracy, is automatically adjusted frequency step, and this can be effectively improved test speed.
Described signal power frequency detecting device is spectrum analyzer.The present invention can adopt the such conventional test instrunment of spectrum analyzer, and testing cost is low.
A kind of passband based on multichannel converter tests the method for testing of system, including:
Step (1): adjustment local oscillation signal generating means, adjustable signal generating device are all identical with the reference clock of signal power frequency detecting device；
Step (2): adopt signal power frequency detecting device to carry out detecting the frequency inputting the at most local oscillation signal of channel frequency converter and performance number；In signal power frequency detecting device, predetermined power threshold range；
Step (3): adjustable signal generating device produces the signal of frequency dynamic adjustment and exports at most channel frequency converter, the power of the output signal of the multichannel converter detected when signal power frequency detecting device is in predetermined power threshold range, and test obtains the passband of multichannel converter.
In described step (2), predetermined power threshold range is local oscillation signal performance number-3dBm ± default error power value.
In described step (3), it is stepped up adjustable signal generating device with predeterminated frequency equivalence interval and inputs the signal frequency of at most channel frequency converter, when signal power frequency detecting device detects the power of multichannel converter output signal in predetermined power threshold range, obtain the upper cut-off frequency of multichannel converter.
In described step (3), progressively reduce adjustable signal generating device with predeterminated frequency equivalence interval and input the signal frequency of at most channel frequency converter, when signal power frequency detecting device detects the power of multichannel converter output signal in predetermined power threshold range, obtain the lower-cut-off frequency of multichannel converter.
In the process of the upper cut-off frequency of test multichannel converter, keep the performance number of the output signal of adjustable signal generating device, the frequency values of the output signal of adjustable signal generating device is adjusted, until the power of the multichannel converter output signal of signal power frequency detecting device test is within the scope of local oscillation signal performance number-3dBm ± default error power value, obtain the upper cut-off frequency of multichannel converter passband.
In the process of the lower-cut-off frequency of test multichannel converter, keep the performance number of the output signal of adjustable signal generating device, the frequency values of the output signal of adjustable signal generating device is adjusted, until the power of the multichannel converter output signal of signal power frequency detecting device test is within the scope of local oscillation signal performance number-3dBm ± default error power value, obtain the lower-cut-off frequency of multichannel converter passband.
The invention have the benefit that
(1) this test system of the present invention have employed the identical local oscillation signal generating means of reference clock, adjustable signal generating device and signal power frequency detecting device carry out test multichannel converter passband, ensure that frequency step is consistent, improve test speed, moreover it is possible to ensure measuring accuracy；Make the present invention adopt conventional test instrunment, reduce testing cost low；
(2) this method of testing of the present invention is in cut-off frequency search procedure, and the test signal power size of side frequency point is compared automatically, it is thus possible to automatically adjust frequency step direction；The method set value of the power according to passband cut-off frequency place, first finds cut-off frequency scope according to big frequency step, carries out small frequency stepping lookup within the scope of this cut-off frequency again；Setting requirement according to measuring accuracy simultaneously, can be automatically adjusted frequency step, this can be effectively improved test speed；In test process simple to operate, it is not necessary to manual calibration, it is possible to achieve automatically test；
Accompanying drawing explanation
Fig. 1 is traditional multichannel converter passband test structural representation；
Fig. 2 is the multichannel converter passband test structural representation of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
No matter being adopt which kind of test instrunment to test, the test realization approach of multichannel converter passband is substantially identical.When keeping input signal power constant, with mid frequency for datum mark, the output signal power that first test center frequency is corresponding, again through the frequency progressively reducing input signal, when output signal power drops to 0.707 times of center frequency point output signal power, namely, when output signal reduces 3dB, lower-cut-off frequency f is just obtainedL；Incrementally increase the frequency of input signal again, when output signal power drops to 0.707 times of center frequency point output signal power, when namely output signal reduces 3dB, obtain upper cut-off frequency fH, thus obtaining multichannel converter passband BW, i.e. BW=fH-fL。
The invention provides a kind of new multichannel converter passband method of testing, for under there is no vector network analyzer premise, universal tester is adopted to realize the automatic test of multichannel converter passband, as in figure 2 it is shown, basic ideas adopt exactly dynamic frequency stepping method to realize quick, accurately test.
The passband test system of the multichannel converter of the present invention, including the identical local oscillation signal generating means of reference clock, adjustable signal generating device and signal power frequency detecting device；
Described local oscillation signal generating means output local oscillation signal at most channel frequency converter, for providing local oscillation signal for multichannel converter, obtains frequency and the performance number of local oscillation signal after signal power frequency detecting device detects；
Adjustable signal generating device produces the signal of frequency dynamic adjustment and exports at most channel frequency converter, the power of the output signal of the multichannel converter detected when signal power frequency detecting device is in predetermined power threshold range, and test obtains the passband of multichannel converter；Signal frequency centered by the frequency of local oscillation signal that described adjustable signal generating device produces.
Wherein, predetermined power threshold range is local oscillation signal performance number-3dBm ± default error power value.So can determine that measuring accuracy sets requirement so that in cut-off frequency search procedure, the test signal power size of side frequency point is compared automatically, it is thus possible to automatically adjust frequency step direction.
The signal that adjustable signal generating device produces dynamically regulates with predeterminated frequency equivalence interval.This test system of such present invention can set requirement according to measuring accuracy, is automatically adjusted frequency step, and this can be effectively improved test speed.
Signal power frequency detecting device is spectrum analyzer.The present invention can adopt the such conventional test instrunment of spectrum analyzer, and testing cost is low.
Based on the present invention multichannel converter passband test system method of testing, including three below step:
Step (1): adjustment local oscillation signal generating means, adjustable signal generating device are all identical with the reference clock of signal power frequency detecting device；
Step (2): adopt signal power frequency detecting device to carry out detecting the frequency inputting the at most local oscillation signal of channel frequency converter and performance number；In signal power frequency detecting device, predetermined power threshold range；
Step (3): adjustable signal generating device produces the signal of frequency dynamic adjustment and exports at most channel frequency converter, the power of the output signal of the multichannel converter detected when signal power frequency detecting device is in predetermined power threshold range, and test obtains the passband of multichannel converter.
Wherein, in step (2), predetermined power threshold range is local oscillation signal performance number-3dBm ± default error power value.
In step (3), it is stepped up adjustable signal generating device with predeterminated frequency equivalence interval and inputs the signal frequency of at most channel frequency converter, when signal power frequency detecting device detects the power of multichannel converter output signal in predetermined power threshold range, obtain the upper cut-off frequency of multichannel converter.
In step (3), progressively reduce adjustable signal generating device with predeterminated frequency equivalence interval and input the signal frequency of at most channel frequency converter, when signal power frequency detecting device detects the power of multichannel converter output signal in predetermined power threshold range, obtain the lower-cut-off frequency of multichannel converter.
In the process of the upper cut-off frequency of test multichannel converter, keep the performance number of the output signal of adjustable signal generating device, the frequency values of the output signal of adjustable signal generating device is adjusted, until the power of the multichannel converter output signal of signal power frequency detecting device test is within the scope of local oscillation signal performance number-3dBm ± default error power value, obtain the upper cut-off frequency of multichannel converter passband.
In the process of the lower-cut-off frequency of test multichannel converter, keep the performance number of the output signal of adjustable signal generating device, the frequency values of the output signal of adjustable signal generating device is adjusted, until the power of the multichannel converter output signal of signal power frequency detecting device test is within the scope of local oscillation signal performance number-3dBm ± default error power value, obtain the lower-cut-off frequency of multichannel converter passband.
In one embodiment of the invention, local oscillation signal generating means and adjustable signal generating device adopt signal generator to realize, and signal power frequency detecting device realizes with spectrum analyzer.
Specifically, before test, first two signal generators and spectrum analyzer being carried out synchronic base, share the reference clock of a 10MHz, the frequency step that so can make three test instrunments is consistent, and the power arranging cut-off frequency place is (P0-3±0.01dBm)。
Signal power frequency detecting device is adopted to carry out detecting the frequency inputting the at most local oscillation signal of channel frequency converter and performance number；Wherein, the frequency of local oscillation signal exports the mid frequency of signal as adjustable signal generating device, uses the size of spectrum analyzer test center Frequency point output signal, is designated as P0。
Adjustable signal generating device reduces frequency values with big frequency step, and the output size of adjustable signal generating device is constant, as spectrum analyzer test output signal PLLess than (P0-3dBm) time, adjustable signal generating device frequency no longer reduces；Then adjustable signal generating device increases frequency values with small frequency stepping, as the output signal P of spectrum analyzer testLDuring more than (P0-3dBm), adjustable signal generating device frequency is not further added by, and adjustable signal generating device reduces frequency values with less frequency step, until the output signal P of spectrum analyzer testLAt (P0-3 ± 0.01dBm) in scope time, write down the test frequency values f of now spectrum analyzerL, obtain the lower-cut-off frequency of multichannel converter passband.
When the upper cut-off frequency of multichannel converter passband is tested, adjustable signal generating device increases frequency values with big frequency step, and the output size of adjustable signal generating device is constant, as spectrum analyzer test output signal PLLess than (P0-3dBm) time, adjustable signal generating device frequency is not further added by；Then adjustable signal generating device reduces frequency values with small frequency stepping, as the output signal P of spectrum analyzer testLMore than (P0-3dBm) time, adjustable signal generating device frequency no longer reduces, and adjustable signal generating device increases frequency values with less frequency step, until the output signal P of spectrum analyzer testLAt (P0-3 ± 0.01dBm) in scope time, write down the test frequency values f of now spectrum analyzerH, obtain the upper cut-off frequency of multichannel converter passband.By calculating, obtain multichannel converter passband BW, i.e. BW=fH-fL。
In the present invention, only use signal generator and spectrum analyzer just can complete the passband test of multichannel converter, easy to connect, the calibration process of complexity need not be carried out before test, but adopt frequency step dynamically to regulate and frequency step direction automatic adjustment technologies, improve test speed, moreover it is possible to ensure measuring accuracy.
The specific embodiment of the present invention is described in conjunction with accompanying drawing although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme, those skilled in the art need not pay various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
1. the passband test system of a multichannel converter, it is characterised in that include the identical local oscillation signal generating means of reference clock, adjustable signal generating device and signal power frequency detecting device；
Described local oscillation signal generating means output local oscillation signal at most channel frequency converter, for providing local oscillation signal for multichannel converter, obtains frequency and the performance number of local oscillation signal after signal power frequency detecting device detects；
Described adjustable signal generating device produces the signal of frequency dynamic adjustment and exports at most channel frequency converter, the power of the output signal of the multichannel converter detected when signal power frequency detecting device is in predetermined power threshold range, and test obtains the passband of multichannel converter；Signal frequency centered by the frequency of local oscillation signal that described adjustable signal generating device produces.
2. the passband test system of a kind of multichannel converter as claimed in claim 1, it is characterised in that described predetermined power threshold range is local oscillation signal performance number-3dBm ± default error power value.
3. the passband test system of a kind of multichannel converter as claimed in claim 1, it is characterised in that the signal that described adjustable signal generating device produces dynamically regulates with predeterminated frequency equivalence interval.
4. the passband test system of a kind of multichannel converter as claimed in claim 1, it is characterised in that described signal power frequency detecting device is spectrum analyzer.
5. the method for testing based on the passband test system of the multichannel converter as described in as arbitrary in claim 1-4, it is characterised in that including:
Step (1): adjustment local oscillation signal generating means, adjustable signal generating device are all identical with the reference clock of signal power frequency detecting device；
Step (2): adopt signal power frequency detecting device to carry out detecting the frequency inputting the at most local oscillation signal of channel frequency converter and performance number；In signal power frequency detecting device, predetermined power threshold range；
Step (3): adjustable signal generating device produces the signal of frequency dynamic adjustment and exports at most channel frequency converter, the power of the output signal of the multichannel converter detected when signal power frequency detecting device is in predetermined power threshold range, and test obtains the passband of multichannel converter.
6. method of testing as claimed in claim 5, it is characterised in that in described step (2), predetermined power threshold range is local oscillation signal performance number-3dBm ± default error power value.
7. method of testing as claimed in claim 6, it is characterized in that, in described step (3), it is stepped up adjustable signal generating device with predeterminated frequency equivalence interval and inputs the signal frequency of at most channel frequency converter, when signal power frequency detecting device detects the power of multichannel converter output signal in predetermined power threshold range, obtain the upper cut-off frequency of multichannel converter.
8. method of testing as claimed in claim 6, it is characterized in that, in described step (3), progressively reduce adjustable signal generating device with predeterminated frequency equivalence interval and input the signal frequency of at most channel frequency converter, when signal power frequency detecting device detects the power of multichannel converter output signal in predetermined power threshold range, obtain the lower-cut-off frequency of multichannel converter.
9. method of testing as claimed in claim 7, it is characterized in that, in the process of the upper cut-off frequency of test multichannel converter, keep the performance number of the output signal of adjustable signal generating device, the frequency values of the output signal of adjustable signal generating device is adjusted, until the power of the multichannel converter output signal of signal power frequency detecting device test is within the scope of local oscillation signal performance number-3dBm ± default error power value, obtain the upper cut-off frequency of multichannel converter passband.
10. method of testing as claimed in claim 8, it is characterized in that, in the process of the lower-cut-off frequency of test multichannel converter, keep the performance number of the output signal of adjustable signal generating device, the frequency values of the output signal of adjustable signal generating device is adjusted, until the power of the multichannel converter output signal of signal power frequency detecting device test is within the scope of local oscillation signal performance number-3dBm ± default error power value, obtain the lower-cut-off frequency of multichannel converter passband.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610327836.1A CN105785206B (en) | 2016-05-16 | 2016-05-16 | A kind of the passband test macro and its method of multichannel frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610327836.1A CN105785206B (en) | 2016-05-16 | 2016-05-16 | A kind of the passband test macro and its method of multichannel frequency converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105785206A true CN105785206A (en) | 2016-07-20 |
| CN105785206B CN105785206B (en) | 2018-12-04 |
Family
ID=56379848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610327836.1A Expired - Fee Related CN105785206B (en) | 2016-05-16 | 2016-05-16 | A kind of the passband test macro and its method of multichannel frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105785206B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990311A (en) * | 2017-05-22 | 2017-07-28 | 中国电子科技集团公司第四十研究所 | Judge the system and method whether field strength is stablized in a kind of radiosensitivity test |
| CN109541334A (en) * | 2017-09-22 | 2019-03-29 | 博西华电器（江苏）有限公司 | Frequency converter test method and test device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680826A (en) * | 2012-05-18 | 2012-09-19 | 中国电子科技集团公司第四十一研究所 | Method for realizing test of embedded local-oscillator frequency converter by utilizing vector network analyzer |
| CN102724000A (en) * | 2011-03-29 | 2012-10-10 | 中兴通讯股份有限公司 | Occupied bandwidth test system and method |
| CN103197272A (en) * | 2013-03-15 | 2013-07-10 | 中国电力科学研究院 | System and method of measuring performance of partial discharge transient state ground voltage detector |
| CN104931911A (en) * | 2015-06-12 | 2015-09-23 | 深圳供电局有限公司 | Calibration device and method of ultra-high frequency partial discharge sensor |
| CN204967811U (en) * | 2015-09-22 | 2016-01-13 | 广东博威尔电子科技有限公司 | Digital interface radio frequency transceiving machine and correcting unit is revealed to local oscillator of using thereof |
| CN105301546A (en) * | 2015-12-04 | 2016-02-03 | 国网浙江省电力公司电力科学研究院 | Ultrasonic partial discharge tester verification method and system |
-
2016
- 2016-05-16 CN CN201610327836.1A patent/CN105785206B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724000A (en) * | 2011-03-29 | 2012-10-10 | 中兴通讯股份有限公司 | Occupied bandwidth test system and method |
| CN102680826A (en) * | 2012-05-18 | 2012-09-19 | 中国电子科技集团公司第四十一研究所 | Method for realizing test of embedded local-oscillator frequency converter by utilizing vector network analyzer |
| CN103197272A (en) * | 2013-03-15 | 2013-07-10 | 中国电力科学研究院 | System and method of measuring performance of partial discharge transient state ground voltage detector |
| CN104931911A (en) * | 2015-06-12 | 2015-09-23 | 深圳供电局有限公司 | Calibration device and method of ultra-high frequency partial discharge sensor |
| CN204967811U (en) * | 2015-09-22 | 2016-01-13 | 广东博威尔电子科技有限公司 | Digital interface radio frequency transceiving machine and correcting unit is revealed to local oscillator of using thereof |
| CN105301546A (en) * | 2015-12-04 | 2016-02-03 | 国网浙江省电力公司电力科学研究院 | Ultrasonic partial discharge tester verification method and system |
Non-Patent Citations (1)
| Title |
|---|
| 宋希珩: "上变频器的工作原理及其测试", 《视听界 广播电视技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990311A (en) * | 2017-05-22 | 2017-07-28 | 中国电子科技集团公司第四十研究所 | Judge the system and method whether field strength is stablized in a kind of radiosensitivity test |
| CN109541334A (en) * | 2017-09-22 | 2019-03-29 | 博西华电器（江苏）有限公司 | Frequency converter test method and test device |
| CN109541334B (en) * | 2017-09-22 | 2022-02-11 | 博西华电器（江苏）有限公司 | Frequency converter testing method and testing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105785206B (en) | 2018-12-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10042029B2 (en) | Calibration of test instrument over extended operating range | |
| TWI490507B (en) | System for testing wireless signals and method for establishing the same | |
| CN105830365B (en) | A kind of monitoring method and device of optical signal to noise ratio | |
| CN105785206A (en) | System and method for testing pass-bands of multichannel frequency converter | |
| CN109813962B (en) | Frequency conversion system group delay measurement method and system based on Hilbert transform | |
| US10739388B2 (en) | Harmonic distortion separation method, nonlinear character determination method and apparatus and system | |
| CN203798907U (en) | Multi-channel broadband microwave radiometer with self-calibration function | |
| CN106209492B (en) | A kind of error-code testing method and system of backboard | |
| CN105119664A (en) | Ultra-short wave radio terminal testing device | |
| CN111082834B (en) | Radio frequency time delay rapid measuring device based on chirp signal orthogonal demodulation | |
| CN107918073B (en) | multichannel measuring method for vector network analyzer | |
| CN108008363B (en) | Calibration system for quantitative measurement radar | |
| CN101123595A (en) | A method and system for gain calibration of digital receiver channel | |
| CN103297154A (en) | Method and device for detecting standing-wave ratio | |
| CN106556755B (en) | A kind of microwave converter input isolation test and system | |
| CN203775191U (en) | Ultrahigh-frequency broadband correction signal source | |
| CN113992280B (en) | Insertion loss calibration device of broadband channel production testing clamp and working method thereof | |
| CN110048769B (en) | Self-adaptive frequency response characteristic testing device and method | |
| TW202332927A (en) | Timing calibration method and system | |
| CN214224154U (en) | Range finding simulator calibrating device based on PXI structure | |
| CN101997620A (en) | Device and method for providing test signals | |
| CN107872283B (en) | Frequency sweeping method and device | |
| CN105445548A (en) | Test system and test method for testing phase coherent properties of radio frequency signals | |
| CN102932076B (en) | A kind of sensitivity test method based on mobile terminal FM receiver and system | |
| CN102957400B (en) | A kind of broadband amplitude equalization compensation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181204 Termination date: 20210516 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |