CN108768451B - 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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- CN108768451B CN108768451B CN201810400681.9A CN201810400681A CN108768451B CN 108768451 B CN108768451 B CN 108768451B CN 201810400681 A CN201810400681 A CN 201810400681A CN 108768451 B CN108768451 B CN 108768451B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B3/00—Line transmission systems
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- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
Abstract
The invention discloses a power line carrier comprehensive test system and a test method, which comprises a first power filter, a first artificial power network, a first common divider, a first carrier attenuator, a frequency spectrograph, a first program-controlled switch, a second power filter, a second artificial power network, a second common divider, a second carrier attenuator, a second program-controlled switch, a resistance load, a copy controller and an ammeter, wherein the first power filter is connected with the first artificial power network; the first artificial power supply network is respectively and electrically connected with the first power supply filter, the first common divider and the first program control switch, and the first carrier attenuator is respectively and electrically connected with the first common divider and the frequency spectrograph; the second artificial power supply network is respectively and electrically connected with the second power supply filter, the second common divider and the first programmable switch, the second carrier attenuator is respectively and electrically connected with the second common divider and the first second divider, and the second common divider is electrically connected with the resistive load. The invention has the following beneficial effects: the system of the invention has simple platform and low cost; the method can realize various carrier test items and has multiple detection functions.
Description
Technical Field
The invention relates to the technical field of power line carrier testing, in particular to a power line carrier comprehensive testing system and a testing method with various detection functions, complete carrier testing items, simple system platform and low cost.
Background
At present, there are various implementation schemes for carrier communication technologies, and carrier signal modulation methods, central frequency points, routing protocols, signal coupling methods, and the like are different from each other. Although each technique has its unique advantages, it also has its disadvantages. As for domestic products, the diversified era is entered, the performance of carrier communication modules of various manufacturers is different, and the meter reading product performance indexes provided by the manufacturers generally accord with the standard. However, because the testing equipment is limited, many testing devices can only test on a single project, the testing means has certain limitation, and the communication function of the carrier communication product cannot be reasonably verified, so that the product performance test is disconnected from the application requirements, and therefore, related tests and evaluations are necessary to be performed, and technical support and basis are provided for selecting proper carrier devices.
Disclosure of Invention
The invention provides a power line carrier comprehensive test system and a test method, which have the advantages of multiple detection functions, complete carrier test items, simple system platform and low cost, and aims to overcome the defects that test equipment is limited and a plurality of test devices can only test a single item in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power line carrier comprehensive test system comprises a first power filter, a first artificial power network, a first common divider, a first carrier attenuator, a frequency spectrograph, a first program-controlled switch and tested equipment; the first artificial power supply network is respectively and electrically connected with the first power supply filter, the first common divider and the first program control switch, the first program control switch is electrically connected with the tested equipment, and the first carrier attenuator is respectively and electrically connected with the first common divider and the frequency spectrograph.
The carrier signal of the invention can be processed by the first artificial power supply network and the first carrier attenuator, test parameters can be set and test results can be obtained by the frequency spectrograph, and various test items can be completed by a simple system platform, such as: the method comprises the following steps of testing the frequency and the level of a carrier signal, measuring the maximum output level of the carrier signal, measuring the interference level outside the frequency band of the carrier signal and the like.
Preferably, the system also comprises a second power filter, a second artificial power network, a second common divider, a second carrier attenuator, a second program-controlled switch, a resistance load, a copy controller and an electric meter; the second artificial power supply network is respectively and electrically connected with a second power supply filter, a second common divider and a first program control switch, the second program control switch is respectively and electrically connected with the meter reading controller and the ammeter, the second carrier attenuator is respectively and electrically connected with the second common divider and the first second divider, and the second common divider is electrically connected with the resistive load; the second power filter, the second artificial power network, the second common divider, the second carrier attenuator, the second programmable switch, the resistance load, the reading controller and the ammeter are added, and more carrier items can be tested, such as: and (5) receiving a sensitivity test.
Preferably, the system also comprises a third program-controlled switch and a carrier load; the third program-controlled switch is electrically connected with the first artificial power supply network, the first program-controlled switch and the carrier load respectively; and a third program control switch and a carrier load are added, so that a carrier loading capability test can be performed.
Preferably, the system also comprises a third common divider and a noise generator; the third common divider is electrically connected with the first artificial power supply network, the first common divider and the noise generator respectively.
Preferably, the first centimeter, the second centimeter and the third centimeter are all two-in-one centimeters.
Preferably, the first carrier attenuator is a piano attenuator and the second carrier attenuator is a programmable attenuator.
Preferably, the first manual power supply network comprises an inductor L1, an inductor L2, an inductor L3, an inductor L4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6; the capacitor C1 is electrically connected with the inductor L1, the inductor L2 and the resistor R1 respectively, the capacitor C2 is electrically connected with the inductor L2 and the resistor R2 respectively, the capacitor C5 is electrically connected with the inductor L3, the inductor L4 and the resistor R6 respectively, the capacitor C6 is electrically connected with the inductor L4 and the resistor R7 respectively, the capacitor C3 is electrically connected with the inductor L1, the device to be tested, the resistor R3 and the resistor R4 respectively, the capacitor C4 is electrically connected with the inductor L3 and the resistor R5 respectively, the resistor R3, the resistor R4 and the resistor R5 are electrically connected with the first carrier attenuator, and the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6 and the resistor R7 are grounded respectively.
A method for testing the receiving sensitivity of a power line carrier integrated test system comprises the following steps:
(8-1) closing the first program control switch and the second program control switch, and receiving the sent communication carrier wave by the tested equipment;
(8-2) reading the data of the tested equipment through the reading controller, recording the communication frequency as f, and if the communication frequency of the tested equipment read by the reading controller is not equal to the communication frequency of the sent communication carrier wave, turning to the step (8-3);
if the communication frequency of the tested equipment read by the reading controller is equal to the communication frequency of the sent communication carrier, the step (8-4) is carried out;
(8-3) adjusting the attenuation magnitude of the second carrier attenuator;
(8-4) adjusting the frequency spectrograph, setting the bandwidth as x MHz, the bandwidth resolution as z Hz and the reference level as y dBuV by taking the communication frequency f as the center frequency to obtain a frequency spectrum signal, wherein the obtained frequency spectrum signal is the frequency spectrum of the receiving sensitivity.
A method for testing background noise of a power line carrier integrated test system is characterized by comprising the following steps:
(9-1) disconnecting the first program control switch, turning on the frequency spectrograph, and setting the starting frequency f1, the ending frequency f2, the sweep frequency width delta f1, the sweep frequency f and the number n of fluctuation points of the carrier wave; n has an initial value of 1, f has an initial value of f 1;
(9-2) carrying out carrier frequency sweep by using the frequency f, when f is less than or equal to f2, turning to the step (9-3),
when f is larger than f2, obtaining the number N of the fluctuation points as N-1, turning off the frequency spectrograph, and turning to the step (9-4);
(9-3) recording the highest level V at which the spectrum fluctuatesnAnd frequency fnIncreasing the value of n by 1 and the value of f by Δ f1, and proceeding to step (9-2);
(9-4) closing the first program-controlled switch, opening the frequency spectrograph, and setting the initial frequency f1, the termination frequency f2, the sweep frequency width delta f1 and the sweep frequency f of the carrier wave as f 1;
(9-5) carrying out carrier frequency sweep by using the frequency f, and turning to the step (9-6) when f is less than or equal to f 2; when f is larger than f2, closing the frequency spectrograph and transferring to the step (9-7);
(9-6) recording the frequency spectrum at frequency fnLevel value V1 of timenIncreasing the value of f by delta f1, and then turning to the step (9-5);
(9-7) when N is less than or equal to N, using the formula Δ Vn＝V1n-VnObtaining the frequency f of the device under testnThe amplitude of the noise in time.
Therefore, the invention has the following beneficial effects: the system of the invention has simple platform and low cost; through the cooperation of artificial power network, programmable switch, public divider, attenuator and load, can realize multiple carrier test project, it is many to detect the function.
Drawings
FIG. 1 is a system block diagram of the present invention;
fig. 2 is a circuit diagram of the artificial power network of the present invention.
In the figure: the system comprises a first power filter 1, a first artificial power network 2, a first common divider 3, a first carrier attenuator 4, a frequency spectrograph 5, a first programmable switch 6, a tested device 7, a second power filter 8, a second artificial power network 9, a second common divider 10, a second carrier attenuator 11, a second programmable switch 12, a resistance load 13, a meter reading controller 14, an ammeter 15, a third programmable switch 16, a carrier load 17, a third common divider 18 and a noise generator 19.
Detailed Description
The invention is further described in the following detailed description with reference to the drawings in which:
example 1
The embodiment shown in fig. 1 is a power line carrier integrated test system, which includes a first power filter 1, a first artificial power network 2, a first common divider 3, a first carrier attenuator 4, a frequency spectrograph 5, a first programmable switch 6, a device under test 7, a third common divider 18, a noise generator 19, and a first cabinet 20; the first artificial power supply network is respectively and electrically connected with the first power supply filter, the first common divider and the first program-controlled switch, the first program-controlled switch is electrically connected with the tested equipment, the first carrier attenuator is respectively and electrically connected with the first common divider and the frequency spectrograph, and the third common divider is respectively and electrically connected with the first artificial power supply network, the first common divider and the noise generator; the first centimeter and the third centimeter are both two-in-one centimeters; the first carrier attenuator is a key attenuator; the first power filter, the first artificial power network, the first common divider, the first carrier attenuator, the frequency spectrograph, the first program-controlled switch, the tested equipment, the third common divider and the noise generator are all located in the first cabinet.
As shown in fig. 2, the first manual power supply network includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and a capacitor C6; the capacitor C1 is electrically connected with the inductor L1, the inductor L2 and the resistor R1 respectively, the capacitor C2 is electrically connected with the inductor L2 and the resistor R2 respectively, the capacitor C5 is electrically connected with the inductor L3, the inductor L4 and the resistor R6 respectively, the capacitor C6 is electrically connected with the inductor L4 and the resistor R7 respectively, the capacitor C3 is electrically connected with the inductor L1, the device to be tested, the resistor R3 and the resistor R4 respectively, the capacitor C4 is electrically connected with the inductor L3 and the resistor R5 respectively, the resistor R3, the resistor R4 and the resistor R5 are electrically connected with the first carrier attenuator, and the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6 and the resistor R7 are grounded respectively.
A method for testing background noise of a power line carrier integrated test system comprises the following steps:
step 100, disconnecting the first program-controlled switch, turning on a frequency spectrograph, and setting the starting frequency f1 of a carrier wave to be 9kHz, the ending frequency f2 to be 500kHz, the sweep frequency width Δ f1 to be 200Hz, the sweep frequency f and the number n of fluctuation points; the initial value of n is 1, and the initial value of f is 9 kHz;
step 200, using frequency f to sweep frequency of carrier wave, when f is less than or equal to 500kHz, turning to step 300,
when f is more than 500kHz, obtaining the number N of the fluctuation points as N-1, closing the frequency spectrograph, and turning to the step 400;
step 300, recording the highest point level V when the frequency spectrum fluctuatesnAnd frequency fnIncreasing the value of n by 1 and the value of f by 200Hz, and then entering the step 200;
step 400, closing the first program-controlled switch, opening the spectrometer, setting the starting frequency f1 of the carrier wave to 9kHz, the ending frequency f2 to 500kHz, the sweep frequency width Δ f1 to 200Hz, and the initial value of the sweep frequency f, f to 9 kHz;
500, carrying out carrier frequency sweep by using frequency f, and turning to 600 when f is less than or equal to 500 kHz; when f is more than 500kHz, closing the frequency spectrograph and turning to the step 700;
step 600, recording the frequency spectrum at frequency fnLevel value V1 of timenIncreasing the value of f by Δ f1 to 200Hz, and proceeding to step 500;
step 700, when N is less than or equal to N, using a formula delta Vn＝V1n-VnObtaining the frequency f of the device under testnOf the hourThe amplitude of the noise.
Step 800, disconnecting the first program-controlled switch, turning on the spectrometer, and setting the start frequency f2 of the carrier wave to 500kHz, the end frequency f3 to 30MHz, the sweep frequency width Δ f2 to 1kHz, the sweep frequency f4, and the number of fluctuation points n 1; the initial value of n1 is 1, and the initial value of f4 is 500 kHz;
step 900, carrier frequency sweep is carried out by using the frequency f4, when f4 is less than or equal to 30MHz, the step 1000 is carried out,
when f4 is larger than 30MHz, obtaining the number N1 of fluctuation points as N1-1, closing the frequency spectrograph, and turning to step 1100;
step 1000, recording the highest point level V when the frequency spectrum fluctuatesn1And frequency fn1Increasing the value of n1 by 1 and the value of f4 by 1kHz, and then proceeding to step 900;
step 1100, closing the first program-controlled switch, opening the spectrometer, setting the start frequency f2 of the carrier to 500kHz, the end frequency f3 to 30MHz, the sweep frequency width Δ f2 to 1kHz, the sweep frequency f4, and the initial value of f4 to f2 to 500 kHz;
step 1200, carrying out carrier frequency sweep by using the frequency f4, and when f4 is less than or equal to 30MHz, turning to step 1300; when f4 is larger than 30MHz, closing the spectrometer and turning to step 1400;
step 1300, recording the frequency spectrum at frequency fn1Level value V1 of timen1Increasing the value of f4 by Δ f2 to 1kHz, and proceeding to step 1200;
step 1400, when N1 is less than or equal to N1, the formula Δ V is usedn1＝V1n1-Vn1Obtaining the frequency f of the device under testn1The amplitude of the noise in time.
A test method for carrier signal frequency and level of a power line carrier integrated test system comprises the following specific steps: closing the first program-controlled switch, and connecting the tested equipment with the artificial power supply network; the method comprises the steps that the tested equipment transmits carrier signals, a frequency spectrograph is turned on, and the bandwidth resolution of a peak detector of the frequency spectrograph is set to be 200 Hz; the frequency and level of the carrier signal are detected by a spectrometer.
A test method for the maximum output level of a carrier signal of a power line carrier integrated test system comprises the following specific steps: closing the first program-controlled switch, and connecting the tested equipment with the artificial power supply network; the tested equipment continuously transmits carrier signals and turns on the frequency spectrograph; the maximum output level of the carrier signal is detected by a spectrometer.
A test method for interference level outside a carrier signal frequency band of a power line carrier integrated test system comprises the following specific steps: closing the first program-controlled switch, and connecting the tested equipment with the artificial power supply network; the tested equipment continuously transmits carrier signals and turns on the frequency spectrograph; and detecting the interference level outside the carrier signal frequency band by the frequency spectrograph.
A test method for carrier signal emission frequency deviation of a power line carrier integrated test system comprises the following specific steps: closing the first program-controlled switch, and connecting the tested equipment with the artificial power supply network; the tested equipment continuously transmits carrier signals and turns on the frequency spectrograph; and finding out the highest point of the output level in the carrier frequency band through the frequency spectrograph, and obtaining the center frequency through the highest point of the output level so as to obtain the transmission frequency deviation of the carrier signal.
A test method for carrier signal emission frequency deviation of a power line carrier integrated test system at different temperatures comprises the following specific steps: placing the tested equipment in a temperature test box, and setting a temperature parameter T; closing the first program-controlled switch, and connecting the tested equipment with the artificial power supply network; the tested equipment continuously transmits carrier signals and turns on the frequency spectrograph; and finding out the highest point of the output level in the carrier frequency band through the frequency spectrograph, and obtaining the center frequency through the highest point of the output level so as to obtain the transmission frequency deviation of the carrier signal under the temperature parameter T.
Example 2
A method for testing the receiving sensitivity of a power line carrier integrated test system comprises the following steps:
step 100, the first program control switch and the second program control switch are closed, and the tested equipment receives the sent communication carrier;
step 200, reading the data of the tested equipment through the reading controller, recording the communication frequency as f, and if the communication frequency of the tested equipment read by the reading controller is not equal to the communication frequency of the sent communication carrier wave, turning to step 300;
if the communication frequency of the tested device read by the reading controller is equal to the communication frequency of the sent communication carrier, the step 400 is executed;
step 300, adjusting the attenuation amplitude of the second carrier attenuator;
and step 400, adjusting the frequency spectrograph, and setting the bandwidth to be x MHz, the bandwidth resolution to be z Hz, and the reference level to be y dBuV by taking the communication frequency f as the central frequency to obtain a frequency spectrum signal, wherein the obtained frequency spectrum signal is the frequency spectrum of the receiving sensitivity.
A test method of static power consumption of a power line carrier integrated test system comprises a second power filter 8, a second artificial power network 9, a second centimeter 10, a resistive load 13, an ammeter 15 and an oscilloscope; the second artificial power supply network is respectively and electrically connected with the second power supply filter, the second centimeter and the ammeter, the ammeter is electrically connected with the oscilloscope, and the resistive load is electrically connected with the second centimeter; the method comprises the following specific steps: in a non-communication state of the electric meter terminal, supplying power to VDD, VCC and alternating current 220V of a carrier module of the electric meter by using an alternating current power supply; and measuring the voltage of VDD by using a voltage probe of the oscilloscope, and measuring the current of VCC by using a current probe of the oscilloscope to obtain the static power consumption.
A test method of static power consumption of a power line carrier integrated test system comprises a second power filter 8, a second artificial power network 9, a second centimeter 10, a resistive load 13, an ammeter 15 and an oscilloscope; the second artificial power supply network is respectively and electrically connected with the second power supply filter, the second centimeter and the ammeter, the ammeter is electrically connected with the oscilloscope, and the resistive load is electrically connected with the second centimeter; the method comprises the following specific steps: in the communication state of the electric meter terminal, supplying power to VDD, VCC and alternating current 220V of a carrier module of the electric meter by using an alternating current power supply; and measuring the voltage of VDD by using a voltage probe of the oscilloscope, and measuring the current of VCC by using a current probe of the oscilloscope to obtain the dynamic power consumption.
A test method of DC power supply noise of a power line carrier integrated test system comprises a second power supply filter 8, a second artificial power supply network 9, a second centimeter 10, a resistive load 13, an ammeter 15 and an oscilloscope; the second artificial power supply network is respectively and electrically connected with the second power supply filter, the second centimeter and the ammeter, the ammeter is electrically connected with the oscilloscope, and the resistive load is electrically connected with the second centimeter; the method comprises the following specific steps: the oscilloscope CH1 is connected with a voltage channel, the oscilloscope CH2 is connected with a current channel, and the signals are transmitted to an AC coupling mode to obtain the ripple noise of the power supply of the electric meter supply module measured by the voltage probe and obtain the ripple noise of the power supply of the electric meter supply module measured by the current probe.
Example 3
Embodiment 3 includes all the structures of embodiment 1 and embodiment 2, and embodiment 3 further includes a third program-controlled switch 16 and a carrier load 17; the third program-controlled switch is electrically connected with the first artificial power supply network, the first program-controlled switch and the carrier load respectively; the third program-controlled switch and the carrier load are both positioned in the first cabinet.
A method for testing the carrier loading capacity of a power line carrier integrated test system comprises the following specific steps: setting the multiple of the programmable attenuator, setting a carrier load, and turning on a third programmable switch; continuously sending a read-write command by a carrier load, turning on a frequency spectrograph, and setting the loan resolution of a peak detector of the frequency spectrograph to be 200 Hz; and finding the central frequency and level value corresponding to the peak value highest point in the carrier frequency band.
The durability test method of the power line carrier integrated test system further comprises a multi-path temperature polling instrument, wherein the multi-path temperature polling instrument is electrically connected with tested equipment; the method comprises the following specific steps: opening a third program control switch, and setting the value of the carrier load; a carrier sending unit of the carrier load sends a carrier signal for 30min at an interval time of 2 s; and detecting the temperature of each functional device of the tested equipment by using the multi-path temperature polling instrument.
It should be understood that this example is for illustrative purposes only and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (9)
1. A method for testing background noise of a power line carrier comprehensive test system is adopted, and the power line carrier comprehensive test system comprises a first power filter (1), a first artificial power network (2), a first power divider (3), a first carrier attenuator (4), a frequency spectrograph (5), a first program-controlled switch (6) and tested equipment (7); the first artificial power supply network is respectively electrically connected with the first power supply filter, the first power divider and the first program control switch, the first program control switch is electrically connected with the tested equipment, and the first carrier attenuator is respectively electrically connected with the first power divider and the frequency spectrometer, and the method is characterized by comprising the following steps of:
(1-1) disconnecting the first program control switch, turning on a frequency spectrograph, and setting the starting frequency f1, the ending frequency f2, the sweep frequency width delta f1, the sweep frequency f and the number n of fluctuation points of a carrier wave; n has an initial value of 1, f has an initial value of f 1;
(1-2) performing carrier frequency sweep by using frequency f, when f is
f2, the process proceeds to step (1-3),
when f is
f2, obtaining the number N = N-1 of fluctuation points, closing the frequency spectrograph, and turning to the step (1-4);
(1-3) recording the highest level V at which the spectrum fluctuatesnAnd frequency fnIncreasing the value of n by 1 and the value of f by Δ f1, and proceeding to step (1-2);
(1-4) closing the first program-controlled switch, opening the frequency spectrograph, and setting the initial frequency f1, the termination frequency f2, the sweep frequency width delta f1 and the sweep frequency f of the carrier wave as f 1;
(1-5) performing carrier frequency sweep by using frequency f, when f is
f2, switching to the step (1-6); when f is
f2, turning off the spectrometer, and turning to the step (1-7);
(1-6) recording the frequency spectrum at frequency fnLevel value V1 of timenIncreasing the value of f by delta f1, and then turning to the step (1-5);
(1-7) when n
When N, using the formula Δ V n =V1n-VnObtaining the frequency f of the device under testnThe amplitude of the noise in time.
2. A power line carrier comprehensive test system based on the test method of the background noise of the power line carrier comprehensive test system of claim 1 is characterized by comprising a first power filter (1), a first artificial power network (2), a first power divider (3), a first carrier attenuator (4), a frequency spectrograph (5), a first program-controlled switch (6) and a tested device (7); the first artificial power supply network is respectively and electrically connected with the first power supply filter, the first power divider and the first program control switch, the first program control switch is electrically connected with the tested equipment, and the first carrier attenuator is respectively and electrically connected with the first power divider and the frequency spectrograph.
3. The power line carrier comprehensive test system according to claim 2, further comprising a second power filter (8), a second artificial power network (9), a second centimeter (10), a second carrier attenuator (11), a second programmable switch (12), a resistive load (13), a meter reading controller (14) and an electric meter (15); the second artificial power supply network is respectively and electrically connected with the second power supply filter, the second power divider and the first program control switch, the second program control switch is respectively and electrically connected with the meter reading controller and the ammeter, the second carrier attenuator is respectively and electrically connected with the second power divider and the first power divider, and the second power divider is electrically connected with the resistive load.
4. The power line carrier integrated test system according to claim 3, further comprising a third programmable switch (16) and a carrier load (17); the third program-controlled switch is electrically connected with the first manual power supply network, the first program-controlled switch and the carrier load respectively.
5. The power-line carrier integrated test system according to claim 3, further comprising a third power splitter (18) and a noise generator (19); the third power divider is electrically connected with the first artificial power supply network, the first power divider and the noise generator respectively.
6. The integrated test system for power line carriers of claim 5, wherein the first power divider, the second power divider and the third power divider are all two-in-one power dividers.
7. The power line carrier integrated test system according to claim 3, wherein the first carrier attenuator is a piano key attenuator and the second carrier attenuator is a programmable attenuator.
8. The integrated test system for the power line carrier as claimed in claim 2, 3, 4, 5, 6 or 7, wherein the first manual power network comprises an inductor L1, an inductor L2, an inductor L3, an inductor L4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6; the capacitor C1 is electrically connected with the inductor L1, the inductor L2 and the resistor R1 respectively, the capacitor C2 is electrically connected with the inductor L2 and the resistor R2 respectively, the capacitor C5 is electrically connected with the inductor L3, the inductor L4 and the resistor R6 respectively, the capacitor C6 is electrically connected with the inductor L4 and the resistor R7 respectively, the capacitor C3 is electrically connected with the inductor L1, the device to be tested, the resistor R3 and the resistor R4 respectively, the capacitor C4 is electrically connected with the inductor L3 and the resistor R5 respectively, the resistor R3, the resistor R4 and the resistor R5 are electrically connected with the first carrier attenuator, and the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6 and the resistor R7 are grounded respectively.
9. A method for testing the reception sensitivity of the power line carrier integrated test system according to claim 3, comprising the steps of:
(9-1) closing the first program control switch and the second program control switch, and receiving the sent communication carrier wave by the tested device;
(9-2) reading the data of the tested equipment through the reading controller, recording the communication frequency as f, and if the communication frequency of the tested equipment read by the reading controller is not equal to the communication frequency of the sent communication carrier wave, turning to the step (9-3);
if the communication frequency of the tested equipment read by the reading controller is equal to the communication frequency of the sent communication carrier, the step (9-4) is carried out;
(9-3) adjusting the attenuation magnitude of the second carrier attenuator;
(9-4) adjusting the frequency spectrograph, setting the bandwidth as x MHz, the bandwidth resolution as z Hz and the reference level as y dBuV by taking the communication frequency f as the center frequency to obtain a frequency spectrum signal, wherein the obtained frequency spectrum signal is the frequency spectrum of the receiving sensitivity.
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