CN108768451A - power line carrier integrated test system and test method - Google Patents
power line carrier integrated test system and test method Download PDFInfo
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- CN108768451A CN108768451A CN201810400681.9A CN201810400681A CN108768451A CN 108768451 A CN108768451 A CN 108768451A CN 201810400681 A CN201810400681 A CN 201810400681A CN 108768451 A CN108768451 A CN 108768451A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
Abstract
The invention discloses a kind of power line carrier integrated test system and test methods, including the first power-supply filter, the first artificial mains network, first centimeter of device, first carrier attenuator, frequency spectrograph, the first program controlled switch, second source filter, the second artificial mains network, second centimeter of device, the second carrier attenuation device, the second program controlled switch, ohmic load, copy controller and ammeter；First artificial mains network is electrically connected with the first power-supply filter, first centimeter of device and the first program controlled switch respectively, and first carrier attenuator is electrically connected with first centimeter of device and frequency spectrograph respectively；Second artificial mains network is electrically connected with second source filter, second centimeter of device and the first program controlled switch respectively, and the second carrier attenuation device is electrically connected with second centimeter of device and the first riffle respectively, and second centimeter of device is electrically connected with ohmic load.The present invention has the advantages that：The system platform of the present invention is simple, at low cost；It can realize that a variety of carrier test projects, detection function are more.
Description
Technical field
The present invention relates to power line carrier technical field of measurement and test, various more particularly, to a kind of detection function, carrier test
Project is complete, and system platform is simple, power line carrier integrated test system at low cost and test method.
Background technology
Currently, carrier communication is there are many implementation, carrier signal modulation mode, center frequency point, Routing Protocol and
Signal coupled modes etc. are different.Although each technology has its unique superiority, also there is its unfavorable factor.With regard to the country
For product, the diversification epoch are had been enter into, the performance of the carrier communication module of each producer difference, the meter reading that producer provides
Product performance index usually all complies with standard.But since test equipment is limited, many test equipments can only be directed to single project
It is tested, means of testing has certain limitation, can not rationally be verified to the communication function of carrier communication product, cause to produce
The inspection of moral character energy disconnects with application demand, it is therefore necessary to carry out relevant test and assessment, to select suitable carrier wave to set
It is standby that technical support and foundation are provided.
Invention content
The present invention in order to overcome in the prior art test equipment it is limited, many test equipments can only be directed to single project into
The deficiency of row test, provides that a kind of detection function is various, and carrier test project is complete, and system platform is simple, electricity at low cost
Line of force carrier wave integrated test system and test method.
To achieve the goals above, present invention employs following technical schemes：
A kind of power line carrier integrated test system, including the first power-supply filter, the first artificial mains network, the first public affairs
Divide device, first carrier attenuator, frequency spectrograph, the first program controlled switch and equipment under test；First artificial mains network is respectively with first
Power-supply filter, first centimeter of device and the electrical connection of the first program controlled switch, the first program controlled switch are electrically connected with equipment under test, and first carries
Wave attenuators are electrically connected with first centimeter of device and frequency spectrograph respectively.
The carrier signal of the present invention passes through frequency spectrograph by the processing of the first artificial mains network and first carrier attenuator
Can be arranged test parameter and can obtain test as a result, a variety of test items can be completed by simple system platform
Mesh, such as：The test of frequency of carrier signal and level, the measurement of carrier signal Maximum Output Level and doing outside carrier signal frequency band
Disturb the measurement etc. of level.
Preferably, further including that second source filter, the second artificial mains network, second centimeter of device, the second carrier wave decline
Subtract device, the second program controlled switch, ohmic load, copy controller and ammeter；Second artificial mains network respectively with second source filter,
Second centimeter of device and the electrical connection of the first program controlled switch, the second program controlled switch are electrically connected with copy controller and ammeter respectively, the second carrier wave
Attenuator is electrically connected with second centimeter of device and the first riffle respectively, and second centimeter of device is electrically connected with ohmic load；Increase
Two power-supply filters, the second artificial mains network, second centimeter of device, the second carrier attenuation device, the second program controlled switch, resistance are negative
Load, copy controller and ammeter, can carry out the test of more multicarrier project, such as：Receiving sensitivity is tested.
Preferably, further including third program controlled switch and carrier load；Third program controlled switch respectively with the first artificial power supply
Network, the first program controlled switch and carrier load electrical connection；Increase third program controlled switch and carrier load, carrier band load can be carried out
Aptitude tests.
Preferably, further including third centimetre device and noise generator；Third centimetre device respectively with the first artificial power net
Network, first centimeter of device and noise generator electrical connection.
Preferably, first centimeter of device, second centimeter of device and third centimetre device are two-in-one centimetre device.
Preferably, first carrier attenuator is key attenuator, the second carrier attenuation device is programmable attenuator.
Preferably, the first artificial mains network includes inductance L1, inductance L2, inductance L3, inductance L4, resistance R1, resistance
R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5 and electricity
Hold C6；Capacitance C1 is electrically connected with inductance L1, inductance L2 and resistance R1 respectively, and capacitance C2 is electrically connected with inductance L2 and resistance R2 respectively
It connecing, capacitance C5 is electrically connected with inductance L3, inductance L4 and resistance R6 respectively, and capacitance C6 is electrically connected with inductance L4 and resistance R7 respectively,
Capacitance C3 is electrically connected with inductance L1, equipment under test, resistance R3 and resistance R4 respectively, capacitance C4 respectively with inductance L3 and resistance R5
Electrical connection, resistance R3, resistance R4 and resistance R5 are electrically connected with first carrier attenuator, resistance R1, resistance R2, resistance R3, electricity
Resistance R4, resistance R5, resistance R6 and resistance R7 are grounded.
A kind of test method of the receiving sensitivity of power line carrier integrated test system, includes the following steps：
(8-1) is closed the first program controlled switch and the second program controlled switch, and equipment under test receives the communication carrier wave sended over；
Communication frequency is recorded as f by (8-2) by the data of copy controller copy reading equipment under test, if copy controller copy reading is arrived
Equipment under test communication frequency with send communication carrier wave communication frequency it is unequal when, be transferred to step (8-3)；
If the communication frequency for the equipment under test that copy controller copy reading is arrived is equal with the communication communication frequency of carrier wave sent,
It is transferred to step (8-4)；
(8-3) adjusts the attenuation amplitude of the second carrier attenuation device；
(8-4) adjust frequency spectrograph, centered on communication frequency f set of frequency bandwidth be x MHz, bandwidth resolution z
Hz, datum obtain spectrum signal for y dBuV, and the spectrum signal of acquisition is the frequency spectrum of receiving sensitivity.
A kind of test method of the background noise of power line carrier integrated test system, which is characterized in that including walking as follows
Suddenly：
(9-1) disconnects the first program controlled switch, opens frequency spectrograph, and the initial frequency f1 of carrier wave is arranged, terminates frequency f2, frequency sweep
Width Delta f1, swept frequency f and fluctuation point number n；The initial value that the initial value of n is 1, f is f1；
(9-2) carries out carrier wave frequency sweep using frequency f and is transferred to step (9-3) as f≤f2,
As f > f2, fluctuation point number N=n-1 is obtained, frequency spectrograph is closed, is transferred to step (9-4)；
The level V of peak when (9-3) record frequency spectrum fluctuatesnWith frequency fn, so that the value of n is increased by 1, the value of f made to increase
Add Δ f1, is transferred to step (9-2)；
(9-4) is closed the first program controlled switch, opens frequency spectrograph, and the initial frequency f1 of carrier wave is arranged, terminates frequency f2, frequency sweep
The initial value of width Delta f1 and swept frequency f, f are f1；
(9-5) carries out carrier wave frequency sweep using frequency f and is transferred to step (9-6) as f≤f2；As f > f2, frequency spectrum is closed
Instrument is transferred to step (9-7)；
It is f that (9-6), which records frequency spectrum in frequency,nWhen level value V1n, so that the value of f is increased Δ f1, be transferred to step (9-5)；
(9-7) utilizes formula Δ V as n≤Nn=V1n-VnEquipment under test is obtained in frequency fnWhen noise amplitude.
Therefore, the present invention has the advantages that：The system platform of the present invention is simple, at low cost；Pass through artificial power supply
Network, program controlled switch, centimetre device, attenuator and the cooperation of load, can realize a variety of carrier test projects, detection function
It is more.
Description of the drawings
Fig. 1 is a kind of system block diagram of the present invention；
Fig. 2 is a kind of circuit diagram of the artificial mains network of the present invention.
In figure：First power-supply filter 1,2, first centimeters of devices 3 of the first artificial mains network, first carrier attenuator 4, frequency
Spectrometer 5, the first program controlled switch 6, equipment under test 7, second source filter 8,9, second centimeters of devices 10 of the second artificial mains network,
Second carrier attenuation device 11, ohmic load 13, copy controller 14, ammeter 15, third program controlled switch 16, carries second program controlled switch 12
Carrier load 17, third centimetre device 18, noise generator 19.
Specific implementation mode
The present invention is described further with specific implementation mode below in conjunction with the accompanying drawings：
Embodiment 1
Embodiment as shown in Figure 1 is a kind of power line carrier integrated test system, including the first power-supply filter 1,
One 2, first centimeters of artificial mains network device 3, first carrier attenuator 4, frequency spectrograph 5, the first program controlled switch 6, equipment under test 7,
Third centimetre device 18, noise generator 19 and the first cabinet-type air conditioner 20；First artificial mains network respectively with the first power-supply filter,
One centimeter of device and the electrical connection of the first program controlled switch, the first program controlled switch are electrically connected with equipment under test, first carrier attenuator difference
Be electrically connected with first centimeter of device and frequency spectrograph, third centimetre device respectively with the first artificial mains network, first centimeter of device and noise
Generator is electrically connected；First centimeter of device and third centimetre device are two-in-one centimetre device；First carrier attenuator is decayed for key
Device；It is first power-supply filter, the first artificial mains network, first centimeter of device, first carrier attenuator, frequency spectrograph, first program-controlled
Switch, equipment under test, third centimetre device and noise generator are respectively positioned in the first cabinet-type air conditioner.
As shown in Fig. 2, the first artificial mains network includes inductance L1, inductance L2, inductance L3, inductance L4, resistance R1, resistance
R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5 and electricity
Hold C6；Capacitance C1 is electrically connected with inductance L1, inductance L2 and resistance R1 respectively, and capacitance C2 is electrically connected with inductance L2 and resistance R2 respectively
It connecing, capacitance C5 is electrically connected with inductance L3, inductance L4 and resistance R6 respectively, and capacitance C6 is electrically connected with inductance L4 and resistance R7 respectively,
Capacitance C3 is electrically connected with inductance L1, equipment under test, resistance R3 and resistance R4 respectively, capacitance C4 respectively with inductance L3 and resistance R5
Electrical connection, resistance R3, resistance R4 and resistance R5 are electrically connected with first carrier attenuator, resistance R1, resistance R2, resistance R3, electricity
Resistance R4, resistance R5, resistance R6 and resistance R7 are grounded.
A kind of test method of the background noise of power line carrier integrated test system, includes the following steps：
Step 100, the first program controlled switch is disconnected, frequency spectrograph is opened, the initial frequency f1=9kHz of carrier wave is set, terminates frequency
Rate f2=500kHz, scan width Δ f1=200Hz, swept frequency f and fluctuation point number n；The initial value of n is the initial of 1, f
Value is 9kHz；
Step 200, it carries out carrier wave frequency sweep using frequency f and is transferred to step 300 as f≤500kHz,
As f > 500kHz, fluctuation point number N=n-1 is obtained, frequency spectrograph is closed, is transferred to step 400；
Step 300, the level V of peak when record frequency spectrum fluctuatesnWith frequency fn, so that the value of n is increased by 1, make f's
Value increases 200Hz, is transferred to step 200；
Step 400, it is closed the first program controlled switch, opens frequency spectrograph, the initial frequency f1=9kHz of carrier wave is set, terminates frequency
The initial value of rate f2=500kHz, scan width Δ f1=200Hz, swept frequency f, f are f1=9kHz；
Step 500, it carries out carrier wave frequency sweep using frequency f and is transferred to step 600 as f≤500kHz；As f > 500kHz
When, frequency spectrograph is closed, step 700 is transferred to；
Step 600, record frequency spectrum is f in frequencynWhen level value V1n, so that the value of f is increased Δ f1=200Hz, be transferred to step
Rapid 500；
Step 700, as n≤N, formula Δ V is utilizedn=V1n-VnEquipment under test is obtained in frequency fnWhen noise width
Degree.
Step 800, the first program controlled switch is disconnected, frequency spectrograph is opened, the initial frequency f2=500kHz of carrier wave is set, is terminated
Frequency f3=30MHz, scan width Δ f2=1kHz, swept frequency f4 and fluctuation point number n1；The initial value of n1 is 1, f4's
Initial value is 500kHz；
Step 900, it carries out carrier wave frequency sweep using frequency f4 and is transferred to step 1000 as f4≤30MHz,
As f4 > 30MHz, fluctuation point number N1=n1-1 is obtained, frequency spectrograph is closed, is transferred to step 1100；
Step 1000, the level V of peak when record frequency spectrum fluctuatesn1With frequency fn1, so that the value of n1 is increased by 1, make
The value of f4 increases 1kHz, is transferred to step 900；
Step 1100, it is closed the first program controlled switch, frequency spectrograph is opened, the initial frequency f2=500kHz of carrier wave is set, eventually
The initial value of only frequency f3=30MHz, scan width Δ f2=1kHz, swept frequency f4, f4 are f2=500kHz；
Step 1200, it carries out carrier wave frequency sweep using frequency f4 and is transferred to step 1300 as f4≤30MHz；As f4 >
When 30MHz, frequency spectrograph is closed, step 1400 is transferred to；
Step 1300, record frequency spectrum is f in frequencyn1When level value V1n1, so that the value of f4 is increased Δ f2=1kHz, be transferred to
Step 1200；
Step 1400, as n1≤N1, formula Δ V is utilizedn1=V1n1-Vn1Equipment under test is obtained in frequency fn1When make an uproar
Sound amplitude.
A kind of test method of the frequency of carrier signal and level of power line carrier integrated test system, specific steps are such as
Under：It is closed the first program controlled switch, equipment under test is connect with artificial mains network；Equipment under test carries out carrier signal transmitting, beats
Frequency spectrograph is opened, the peak detector bandwidth resolution that frequency spectrograph is arranged is 200Hz；Pass through the frequency of frequency spectrograph detected carrier signal
And level.
A kind of test method of the carrier signal Maximum Output Level of power line carrier integrated test system, specific steps are such as
Under：It is closed the first program controlled switch, equipment under test is connect with artificial mains network；Equipment under test carries out the continuous hair of carrier signal
It penetrates, opens frequency spectrograph；Pass through the Maximum Output Level of frequency spectrograph detected carrier signal.
A kind of test method of interference level outside the carrier signal frequency band of power line carrier integrated test system is specific to walk
It is rapid as follows：It is closed the first program controlled switch, equipment under test is connect with artificial mains network；Equipment under test carries out the company of carrier signal
Supervention is penetrated, and frequency spectrograph is opened；Pass through the interference level outside frequency spectrograph detected carrier signal band.
A kind of test method of the carrier signal tranmitting frequency offset of power line carrier integrated test system, specific steps are such as
Under：It is closed the first program controlled switch, equipment under test is connect with artificial mains network；Equipment under test carries out the continuous hair of carrier signal
It penetrates, opens frequency spectrograph；Output level peak is found out in carrier frequency band by frequency spectrograph, is obtained by output level peak
Centre frequency, to obtain the offset of carrier signal tranmitting frequency.
A kind of test of the carrier signal tranmitting frequency offset at different temperatures of power line carrier integrated test system
Method is as follows：Equipment under test is placed in temperature test chamber, setting temperature parameter T；First is closed program-controlled to open
It closes, equipment under test is connect with artificial mains network；Equipment under test carries out the continuous transmitting of carrier signal, opens frequency spectrograph；It is logical
It crosses frequency spectrograph and finds out output level peak in carrier frequency band, centre frequency is obtained by output level peak, to obtain
Obtain the carrier signal tranmitting frequency offset at temperature parameter T.
Embodiment 2
Embodiment 2 includes all structures in embodiment 1, and embodiment 2 further includes second source filter 8, the second people
9, second centimeters of devices 10 of work electric power network, the second carrier attenuation device 11, the second program controlled switch 12, ohmic load 13, copy controller 14,
Ammeter 15, oscillograph and the second cabinet-type air conditioner 21；Second artificial mains network respectively with second source filter, second centimeter of device and
One program controlled switch is electrically connected, and the second program controlled switch is electrically connected with copy controller and ammeter respectively, and the second carrier attenuation device is respectively with the
Two centimeters of devices and the electrical connection of the first riffle, second centimeter of device are electrically connected with ohmic load；Second centimeter of device is two-in-one centimetre
Device；Second carrier attenuation device is programmable attenuator；Second source filter, the second artificial mains network, second centimeter of device, second
Carrier attenuation device, the second program controlled switch, ohmic load, copy controller and ammeter are respectively positioned in the second cabinet-type air conditioner.
A kind of test method of the receiving sensitivity of power line carrier integrated test system, includes the following steps：
Step 100, it is closed the first program controlled switch and the second program controlled switch, equipment under test receives the communication sended over and carries
Wave；
Step 200, by the data of copy controller copy reading equipment under test, communication frequency is recorded as f, if copy controller copy reading
When the communication frequency of the equipment under test arrived and the unequal communication frequency of the communication carrier wave sent, it is transferred to step 300；
If the communication frequency for the equipment under test that copy controller copy reading is arrived is equal with the communication communication frequency of carrier wave sent,
It is transferred to step 400；
Step 300, the attenuation amplitude of the second carrier attenuation device is adjusted；
Step 400, adjust frequency spectrograph, centered on communication frequency f set of frequency bandwidth be x MHz, bandwidth resolution z
Hz, datum obtain spectrum signal for y dBuV, and the spectrum signal of acquisition is the frequency spectrum of receiving sensitivity.
A kind of test method of the quiescent dissipation of power line carrier integrated test system, including second source filter 8,
Two 9, second centimeters of artificial mains network devices 10, ohmic load 13, ammeter 15 and oscillograph；Second artificial mains network respectively with
Second source filter, second centimeter of device and ammeter electrical connection, ammeter are electrically connected with oscillograph, ohmic load and second centimeter of device
Electrical connection；It is as follows：In the state of ammeter terminal non-communicating, using AC power to the carrier module of ammeter
VDD, VCC and alternating current 220V are powered；The voltage that VDD is measured with the voltage probe of oscillograph, with the current probe of oscillograph
The electric current of VCC is measured, quiescent dissipation is obtained.
A kind of test method of the quiescent dissipation of power line carrier integrated test system, including second source filter 8,
Two 9, second centimeters of artificial mains network devices 10, ohmic load 13, ammeter 15 and oscillograph；Second artificial mains network respectively with
Second source filter, second centimeter of device and ammeter electrical connection, ammeter are electrically connected with oscillograph, ohmic load and second centimeter of device
Electrical connection；It is as follows：In the state that ammeter terminal communicates, using AC power to the VDD of the carrier module of ammeter,
VCC and alternating current 220V are powered；The voltage that VDD is measured with the voltage probe of oscillograph is measured with the current probe of oscillograph
The electric current of VCC obtains dynamic power consumption.
A kind of test method of the DC power supply noise of power line carrier integrated test system, including second source filter
8,9, second centimeters of devices 10 of the second artificial mains network, ohmic load 13, ammeter 15 and oscillograph；Second artificial mains network point
It is not electrically connected with second source filter, second centimeter of device and ammeter, ammeter is electrically connected with oscillograph, ohmic load and the second public affairs
Divide device electrical connection；It is as follows：Oscillograph CH1 connects voltage channel, and CH2 connects current channel, gets to AC coupled modes, obtains
With the Ripple Noise of voltage probe measurement ammeter supplying module power supply, obtain with electric current probe measurement ammeter supplying module power supply
Ripple Noise.
Embodiment 3
Embodiment 3 includes all structures of embodiment 1 and embodiment 2, and embodiment 3 further includes third program controlled switch 16 and carries
Carrier load 17；Third program controlled switch is electrically connected with the first artificial mains network, the first program controlled switch and carrier load respectively；Third
Program controlled switch and carrier load are respectively positioned in the first cabinet-type air conditioner.
A kind of test method of the carrier wave load capacity of power line carrier integrated test system, is as follows：Setting
The multiple of programmable attenuator sets carrier load, opens third program controlled switch；Carrier load continuously transmits read write command, opens
Frequency spectrograph, the peak detector loan resolution ratio that frequency spectrograph is arranged is 200Hz；Peak value peak correspondence is found in carrier frequency band
Centre frequency and level value.
A kind of test method of the durability of power line carrier integrated test system, further includes multipath temperature patrol inspection instrument, more
Road temperature polling instrument is electrically connected with equipment under test；It is as follows：Third program controlled switch is opened, the value of carrier load is set；
The carrier wave transmission unit of carrier load is that 2s emits carrier signal 30min with interval time；It is detected using multipath temperature patrol inspection instrument
The temperature of each function element of equipment under test.
It should be understood that this embodiment is only used to illustrate the invention but not to limit the scope of the invention.In addition, it should also be understood that,
After having read the content of the invention lectured, those skilled in the art can make various modifications or changes to the present invention, these etc.
Valence form is also fallen within the scope of the appended claims of the present application.
Claims (9)
1. a kind of power line carrier integrated test system, which is characterized in that including the first power-supply filter (1), the first artificial electricity
Source network (2), first centimeter of device (3), first carrier attenuator (4), frequency spectrograph (5), the first program controlled switch (6) and equipment under test
(7)；First artificial mains network is electrically connected with the first power-supply filter, first centimeter of device and the first program controlled switch respectively, and first
Program controlled switch is electrically connected with equipment under test, and first carrier attenuator is electrically connected with first centimeter of device and frequency spectrograph respectively.
2. power line carrier integrated test system according to claim 1, which is characterized in that further include second source filtering
Device (8), the second artificial mains network (9), second centimeter of device (10), the second carrier attenuation device (11), the second program controlled switch (12),
Ohmic load (13), copy controller (14) and ammeter (15)；Second artificial mains network respectively with second source filter, second public
Device and the electrical connection of the first program controlled switch, the second program controlled switch is divided to be electrically connected respectively with copy controller and ammeter, the second carrier attenuation device
It is electrically connected respectively with second centimeter of device and the first riffle, second centimeter of device is electrically connected with ohmic load.
3. power line carrier integrated test system according to claim 2, which is characterized in that further include third program controlled switch
(16) and carrier load (17)；Third program controlled switch respectively with the first artificial mains network, the first program controlled switch and carrier load
Electrical connection.
4. power line carrier integrated test system according to claim 2, which is characterized in that further include third centimetre device
(18) and noise generator (19)；Third centimetre device respectively with the first artificial mains network, first centimeter of device and noise generator
Electrical connection.
5. power line carrier integrated test system according to claim 4, which is characterized in that first centimeter of device, the second public affairs
It is two-in-one centimetre device to divide device and third centimetre device.
6. power line carrier integrated test system according to claim 2, which is characterized in that first carrier attenuator is qin
Key attenuator, the second carrier attenuation device are programmable attenuator.
7. according to the power line carrier integrated test system described in claims 1 or 2 or 3 or 4 or 5 or 6, which is characterized in that the
One artificial mains network includes inductance L1, inductance L2, inductance L3, inductance L4, resistance R1, resistance R2, resistance R3, resistance R4, electricity
Hinder R5, resistance R6, resistance R7, capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5 and capacitance C6；Capacitance C1 respectively with electricity
Feel L1, inductance L2 and resistance R1 electrical connection, capacitance C2 is electrically connected with inductance L2 and resistance R2 respectively, capacitance C5 respectively with inductance
L3, inductance L4 and resistance R6 electrical connection, capacitance C6 are electrically connected with inductance L4 and resistance R7 respectively, capacitance C3 respectively with inductance L1,
Equipment under test, resistance R3 and resistance R4 electrical connections, capacitance C4 are electrically connected with inductance L3 and resistance R5 respectively, resistance R3, resistance R4
Be electrically connected with first carrier attenuator with resistance R5, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 and
Resistance R7 is grounded.
8. a kind of test method of the receiving sensitivity based on the power line carrier integrated test system described in claim 2,
It is characterized in that, includes the following steps：
(8-1) is closed the first program controlled switch and the second program controlled switch, and equipment under test receives the communication carrier wave sended over；
Communication frequency is recorded as f by (8-2) by the data of copy controller copy reading equipment under test, if the quilt that copy controller copy reading is arrived
When the communication frequency of measurement equipment and the unequal communication frequency of the communication carrier wave sent, it is transferred to step (8-3)；
If the communication frequency for the equipment under test that copy controller copy reading is arrived is equal with the communication communication frequency of carrier wave sent, it is transferred to
Step (8-4)；
(8-3) adjusts the attenuation amplitude of the second carrier attenuation device；
(8-4) adjusts frequency spectrograph, and set of frequency bandwidth is x MHz centered on communication frequency f, bandwidth resolution is z Hz, ginseng
It examines level and obtains spectrum signal for y dBuV, the spectrum signal of acquisition is the frequency spectrum of receiving sensitivity.
9. a kind of test method of the background noise based on power line carrier integrated test system described in claim 1, special
Sign is, includes the following steps：
(9-1) disconnects the first program controlled switch, opens frequency spectrograph, and the initial frequency f1 of carrier wave is arranged, terminates frequency f2, scan width
Δ f1, swept frequency f and fluctuation point number n；The initial value that the initial value of n is 1, f is f1；
(9-2) carries out carrier wave frequency sweep using frequency f and is transferred to step (9-3) as f≤f2,
As f > f2, fluctuation point number N=n-1 is obtained, frequency spectrograph is closed, is transferred to step (9-4)；
The level V of peak when (9-3) record frequency spectrum fluctuatesnWith frequency fn, so that the value of n is increased by 1, the value of f made to increase Δ
F1 is transferred to step (9-2)；
(9-4) is closed the first program controlled switch, opens frequency spectrograph, and the initial frequency f1 of carrier wave is arranged, terminates frequency f2, scan width
The initial value of Δ f1 and swept frequency f, f are f1；
(9-5) carries out carrier wave frequency sweep using frequency f and is transferred to step (9-6) as f≤f2；As f > f2, frequency spectrograph is closed,
It is transferred to step (9-7)；
It is f that (9-6), which records frequency spectrum in frequency,nWhen level value V1n, so that the value of f is increased Δ f1, be transferred to step (9-5)；
(9-7) utilizes formula Δ V as n≤Nn=V1n-VnEquipment under test is obtained in frequency fnWhen noise amplitude.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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