CN115395970B

CN115395970B - Method for electrifying and debugging traveling wave tube transmitter

Info

Publication number: CN115395970B
Application number: CN202211085684.0A
Authority: CN
Inventors: 吴庆宝
Original assignee: NANJING CHANGJIANG ELECTRONICS GROUP CO Ltd
Current assignee: NANJING CHANGJIANG ELECTRONICS GROUP CO Ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2023-12-22
Anticipated expiration: 2042-09-06
Also published as: CN115395970A

Abstract

The invention relates to a traveling wave tube transmitter electrifying debugging method, which comprises a row-placing cabinet, a modulation cabinet and a water-cooling cabinet which are connected in sequence, wherein the debugging method comprises the following steps: energizing the transmitter at low voltage; debugging the modulated pulse waveform; the preparation work before the transmitter loads the traveling wave tube; high-pressure aging is carried out on the transmitter by a traveling wave tube; debugging transmitter power, spectrum, radio frequency envelope, etc. The method for debugging the electrified traveling wave tube transmitter can greatly shorten the debugging period of the transmitter.

Description

Method for electrifying and debugging traveling wave tube transmitter

Technical Field

The invention relates to a method for debugging a traveling wave tube transmitter in a power-on mode, and belongs to the technical field of transmitter debugging.

Background

The transmitter plays an important role in national defense weapons such as radars, electronic countermeasure and communication equipment, and mainly shows the amplifying output function of signals; the traveling wave tube is a core component of the transmitter, and is widely applied because of the large frequency bandwidth and the large output power of the traveling wave tube. However, the traveling wave tube has a complex structure and a high voltage of a power supply circuit, so that the debugging of the traveling wave tube transmitter has the problem of long period, generally about 20 days.

Disclosure of Invention

The invention provides a traveling wave tube transmitter power-on debugging method with a short debugging period, which aims to solve the problems in the prior art.

In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the traveling wave tube transmitter comprises a row-placing cabinet, a modulation cabinet and a water-cooling cabinet which are connected in sequence;

the debugging method comprises the following steps:

step one, electrifying a transmitter at low voltage;

step two, modulating pulse waveforms;

step three, preparing the transmitter before loading the traveling wave tube;

step four, high-pressure aging of the traveling wave tube is carried out on the transmitter;

and fifthly, debugging the power, the frequency spectrum and the radio frequency envelope of the transmitter.

The technical scheme is further designed as follows: the first step specifically comprises the following steps:

step 1.1, connecting a row placing cabinet, a modulation cabinet and a water cooling cabinet with a distribution box;

step 1.2, checking cabinet grounding and insulation resistance;

step 1.3, checking the connection of a main power supply cable and the phase sequence;

step 1.4, powering on a transmitter and detecting faults;

step 1.5, carrying out electrifying inspection on the water-cooled cabinet;

and 1.6, checking the water cooling circulation cooling waterway.

When the row-discharge cabinet, the modulation cabinet and the water-cooling cabinet are connected with the distribution box, a T1X1 plug of the row-discharge cabinet is connected with a T2X3 plug of the modulation cabinet through a row-discharge distribution cable, and a T1X2 plug of the row-discharge cabinet is connected with a T2X4 plug of the modulation cabinet through a row-discharge signal cable; the T2X1 plug of the modulation cabinet is connected with the distribution box, and the T2X5 plug of the modulation cabinet is connected with the T3X2 plug of the water-cooling cabinet through a water-cooling signal cable; the T3X1 plug of the water-cooled cabinet is connected with the distribution box.

The second step specifically comprises the following steps:

step 2.1, connecting a transmitter with a resistor load;

step 2.2, after the transmitter is preheated, checking an input signal of an inversion unit component; the charge and discharge trigger signal is not output or abnormal voltage is not output or voltage output is abnormal, and the inversion trigger signal is not output or abnormal fault is eliminated;

step 2.3, checking a charge and discharge trigger signal; if no output or abnormal faults of the charge and discharge trigger signals occur, performing fault removal;

step 2.4, checking an overcurrent fault function of the inverter;

step 2.5, checking the output voltage of the left Lu Nibian device; if the inverter has no voltage output fault, performing fault removal;

Step 2.6, checking the single-path output modulation pulse waveform of the inverter; if the faults of the cathode that the high voltage is not added, the ignition and the modulation pulse waveform are abnormal and the waveform of the output current of the inverter is abnormal or the output current is disordered after the voltage is increased appear, the fault is removed;

step 2.7, checking the output voltage of the right-path inverter;

and 2.8, checking the two-way output modulation pulse waveform of the inverter.

The resistive load impedance is 3.4kΩ±0.1kΩ.

The third step specifically comprises the following steps:

step 3.1, checking the preheating time of a transmitter;

step 3.2, checking the switch fault function of the door of the modulating cabinet and the row-discharging cabinet;

step 3.3, checking the water cooling comprehensive fault function;

step 3.4, checking the output of a filament power supply and the fault function;

step 3.5, checking a charging overcurrent fault function;

and 3.6, checking the overcurrent fault function of the titanium pump.

The step 3.3 specifically includes:

step 3.3.1, setting each fault alarm threshold of the water-cooling cabinet;

step 3.3.2, checking the function of the flow fault of the liquid supply;

and 3.3.3, checking the function of fault of the liquid supply temperature.

The step 3.4 specifically includes:

step 3.4.1, checking the no-load output voltage of the filament power supply;

step 3.4.2, checking a filament power failure function;

And 3.4.3, applying filament voltage to the traveling wave tube.

The fourth step specifically comprises: and (3) starting up the transmitter and checking the fault function of high voltage and overlarge body current of the traveling wave tube.

The fifth step specifically comprises the following steps: detecting the oversized standing wave fault function of the transmitter; checking the input pulse power of the traveling wave tube; the radio frequency envelope and the power of the transmitter are debugged; transmitter radio frequency spectrum debugging.

The invention has the beneficial effects that:

the invention designs the modulation method aiming at the characteristics of high voltage, high current and high power of the traveling wave tube transmitter by adopting the electric vacuum technology, and the characteristics of complex system, high risk during operation and higher requirements for the personnel to be modulated.

The debugging method mainly comprises the steps of debugging a modulation pulse waveform, debugging an uplink wave tube, debugging transmitter power, frequency spectrum and radio frequency envelope. The debugging step design is scientific and practical, and the operability is strong. Fully meets the requirements of transmitter subsystem debugging, whole machine adjustment, business trip maintenance and user fault removal.

The method for debugging the traveling wave tube transmitter in the invention can shorten the debugging period of the traveling wave tube transmitter from 20 days to 7 days, and can increase the reliability of the transmitter. Can ensure the quality and the progress requirement of the product.

Drawings

FIG. 1 shows the mutual positional relationship of the cabinets during debugging of the present invention;

FIG. 2 is a block diagram of a transmitter connection;

FIG. 3 is a sequence diagram of the transmitter on-off;

FIG. 4 is a transmitter modulation pulse waveform debug block diagram;

fig. 5 is a waveform of an output trigger signal of the inverter control circuit box;

FIG. 6 is a timing diagram of a charge and discharge trigger signal;

FIG. 7 (a) is a modulated pulse waveform;

fig. 7 (b) is a modulated pulse charge-discharge waveform;

fig. 8 is an inverter output current waveform;

FIG. 9 is a filament power failure test block diagram;

FIG. 10 is a filament supply sampling voltage;

fig. 11 transmitter test power, spectrum, envelope block diagram;

fig. 12 is a radio frequency envelope diagram.

Detailed Description

The invention will now be described in detail with reference to the accompanying drawings and specific examples.

Examples

The power-on debugging method of the traveling wave tube transmitter of the embodiment comprises the following steps:

step one, preparing a transmitter before debugging;

1.1 preparing hardware equipment required by debugging;

connecting cable between cabinets

Table 1 prepared cable

Instrument is used in debugging:

table 2 preparation of the instrument

The tool and the equipment for debugging are as follows:

table 3 tools and equipment to be prepared

Sequence number	Instrument model and name	Quantity of	Remarks
				1	Filament power failure test stand	One table
2	Titanium pump overcurrent fault test stand	One table
				3	High-voltage resistor load test bed	One table
4	Attenuation code test bed	One table
				5	Transmitter test bed	One table
6	Current sampling ring	Two pieces
				7	20dB (frequency XGHz) coaxial attenuator	One-piece
8	Special test cable for monitoring circuit	One by one
				9	Wave guide load of traveling wave tube	One or more of
10	Water pump and water tank for secondary water cooling of XX1 transmitter	One set of	XXXC, XXXG is not used

1.2, checking the alignment of the transmitter and each component unit;

checking whether all the component units in the row-laying cabinet (T1 cabinet), the modulation cabinet (T2 cabinet) and the water-cooling cabinet are sleeved in a uniform manner, and checking whether the cable head connection is reliable or not and whether the assembly check is qualified or not.

1.3 the mutual placement positions of the cabinets;

the placing sequence of each cabinet and the high-voltage resistor load as well as the traveling wave tube waveguide load is shown in fig. 1 from left to right:

the distance between the high-voltage resistor load and the waveguide load of the traveling wave tube is kept about 0.5 meter, and the distance between the row amplifier and the modulation cabinet is about 0.15 meter, so that the cable head can be smoothly plugged and unplugged by a hand.

Checking the structure and wiring of the transmitter before powering on;

2.1, checking a total power supply of the transmitter;

when each cabinet is inspected, special attention is paid to whether short circuit phenomenon exists between an alternating current 380V phase line and an alternating current 220V phase line in the circuit and the chassis ground or not, and if so, the short circuit phenomenon is immediately eliminated;

The method comprises the steps that XXXC and XXXG transmitters are connected through a total distribution cable socket T2X1: 1. the 2, 3 cores are three-phase 380V, the 4 cores are neutral wires, short circuit should not occur among the 1, 2, 3 cores, and the 500V cradle for the insulation resistance of the 1, 2, 3, 4 cores to the chassis ground should be larger than 20MΩ;

the general distribution cable socket T2X1 of XX1 transmitter: 1. the three cores 2 and 9 are 380V A phase, the three cores 3, 4 and 10 are 380V B phase, the three cores 5, 6 and 11 are 380V C phase, the core 7 is a central line, the core 8 is low-voltage alternating current power distribution 220V, and the discrimination standard is the same as that of XXXC and XXXG transmitters

2.2 modulating Cabinet Structure and Wiring inspection

The modulation cabinet mainly comprises a power distribution unit, an inversion unit, a rectification unit and the like.

2.2.1, checking a power distribution unit;

the power distribution unit should ensure when checking the line:

the method comprises the steps that input and output of a three-phase relay are disconnected in a non-energized state;

the positive end and the negative end of the output of the three-phase rectifier bridge stack cannot be connected reversely;

the positive and negative ends of the filter capacitors C1 and C2 cannot be connected reversely;

fourth step, wiring board T2X10: 11. 12 should be short-circuited, i.e. the bleeder relay should be closed.

2.2.2, checking the inversion unit assembly;

when the inversion unit assembly is inspected, all connecting cables are removed, then the unit is pulled out, and a cover plate is opened for inspection:

firstly, ensuring that 2 only the assembling direction of a silicon controlled rectifier is correct, and tightly pressing and assembling a radiator;

The positive and negative of the trigger line of the silicon controlled rectifier cannot be connected reversely, the negative end is connected with the K end of the silicon controlled rectifier, the other end is the positive end, the resistance impedance of the two ends of the trigger line of the silicon controlled rectifier is measured by a three-purpose meter, and the impedance value is 15 omega-30 omega;

thirdly, checking the forward and reverse resistance of the silicon controlled rectifier by using the diode file of the three-purpose meter, wherein the forward resistance value is more than 1000, and the reverse resistance value is about 340, and the forward characteristic of the diode connected in parallel on the silicon controlled rectifier is actually achieved;

the thyristor cooling fin should not be short-circuited to the shell.

After the inspection, the inversion unit assembly is pushed into the cabinet, two silicon controlled trigger signal cables are connected, the inversion control circuit box cover plate is opened, and three-purpose meters are used for inspecting four trigger output A, B ends of the inversion control circuit box to two inversion unit assembly inner rotating plates EX3 and EX4: 1. and 3, the inverter circuit control boxes X2 and X3 are triggered to be one group of corresponding left-way inverter units, the other group of corresponding right-way inverter units is triggered to be X4 and X5, and all trigger signal lines cannot be short-circuited to the ground.

2.2.3 inspection of the rectifying unit assembly;

the rectifying unit focuses on checking that the positive terminal and the negative terminal of the filter capacitors C3 and C4 cannot be connected in error, the pins of the capacitor C5 are easy to break, and if the breaking affects the output current waveform of the inversion unit component.

2.3 checking the structure and wiring of the row-placing cabinet;

the row discharge cabinet mainly comprises a charge-discharge silicon controlled rectifier unit, a high-voltage capacitor unit, a high-voltage resistor unit, a filament power supply assembly, a traveling wave tube assembly, a manual wire, a pulse transformer and the like.

2.3.1 charging and discharging the silicon controlled unit and checking by manual lines;

the charge and discharge thyristor unit is mainly checked:

the method includes the steps that the installation direction of two silicon controlled rectifiers is correct, and a radiator is pressed and assembled;

the trigger impedance of the silicon controlled rectifier is 15-30Ω, the resistance at two ends of the charging silicon controlled rectifier is more than 200kΩ, the forward resistance of the discharging silicon controlled rectifier is more than 1000 when checked by the three-purpose meter diode, the reverse direction is about 340, and the forward characteristic of the anti-peak diode connected in parallel at two ends of the discharging silicon controlled rectifier is actually achieved;

the thyristor radiator is not short-circuited to the shell;

the charging out (98 #, 99 #) line, discharging in 201# line, 202# line, 203# line and the like connected with the artificial line and the pulse transformer should be as short as possible, otherwise, the distribution parameters of the wires are large, and the modulation pulse waveform is affected;

and fifthly, because the charge and discharge current is large, all welding spots are firmly welded, and the welding lug fixed by the screw and the nut is tightly pressed.

Checking the artificial wire requires checking whether the multi-strand wire on the artificial wire is fallen off or not, and if so, replacing the artificial wire capacitor bank.

2.3.2 filament power assembly inspection;

the filament power supply assembly needs to check that the heads 1 and 2 of the filament power supply adapter plates are correctly connected with the heads 5 and 7 of the pulse transformers. The three-purpose meter is used for checking that the resistances XXXC and XXXG of the head pair casing of the filament power supply adapter plate 1 are about 15 omega, XX1 is about 6 omega, the resistances XXXC and XXXG of the head pair casing of the adapter plate 2 are about 24 omega, XX1 is about 21 omega, and the two ends cannot be reversed. The short-circuit lines among the heads 1, 4 and the shell of the filament power supply adapter plate are connected, the head of the pulse transformer 6 is connected to the back plate screw of the traveling wave tube assembly through a high-voltage capacitor and a cathode current transformer, the connection reliability is ensured, and otherwise, high-voltage ignition is caused. The filament power supply and the high-voltage device should be checked by taking care that the high-voltage installation part and the wiring terminal should be clean, dust and dew are not generated, otherwise, the high-voltage ignition of the transmitter is caused.

2.3.3 high voltage resistance cell inspection;

all socket head cap screws on the high-voltage resistor unit are required to be tightened, the 4-head 213# lead of the adapter plate X2 is required to be reliably grounded, and otherwise, high-voltage ignition is caused. The high voltage wires include 204#, 205#, 209#, 210#, 211# and the like, which are assembled as short as possible and are spaced as far from the device housing as possible to avoid high voltage sparking and to secure the connection pads.

2.3.4 traveling wave tube assembly inspection;

all fixed waveguide screws from the power output port of the traveling wave tube assembly to the waveguide port at the top of the cabinet are tight, so that microwave leakage is avoided, and internal interference of the machine is increased.

Step three, powering on and debugging the transmitter;

the transmitter power-on debugging is carried out according to the following steps: the method comprises the steps of low-voltage electrifying, debugging a modulation pulse waveform, preparing before the transmitter loads a traveling wave tube, high-voltage aging by the traveling wave tube, and finally debugging the power, the frequency spectrum and the envelope of the transmitter, wherein the specific process is as follows.

3.1 low-voltage energizing of the transmitter;

3.1.1 connection of cabinet power supply, signal cable and water pipe;

connect power, signal cable between row put, modulation, the water-cooling rack, connect water-cooling rack and row put the outlet pipe between the rack, as shown in fig. 2:

the transmitter total power distribution (modulation cabinet top) T2X1 plug, the water-cooling cabinet total power distribution T3X1 plug and the modulation cabinet +500V output plugs T1X7 and T1X8 are temporarily disconnected;

disconnecting the plug of the inverter control circuit box X1 and the plug of the monitoring circuit X2 of the modulation cabinet, disconnecting the plug of the parameter display box X1, the plug of the charging and discharging trigger circuit X1, the plug of the standing wave protection control circuit X1, the plug of the titanium pump power supply X1 and the plug of the 2W power amplification module X1 in the row discharge cabinet, and taking down the plugs of the shielding boxes to check whether the power supply is normal or not after being electrified, wherein the taken down plugs should avoid collision with other objects;

Taking down fuses in the two inversion unit components, disconnecting the hot wire and cathode connection wires of the traveling wave tube on the filament power supply and properly fixing the hot wire and the cathode connection wires to avoid creepage, and keeping the two fuses;

the main pump and the liquid adding pump switch of the water cooling cabinet are arranged at the 'off' position.

3.1.2 cabinet grounding and insulation inspection;

the grounding piles of the cabinets are reliably connected together and connected to the ground, the grounding resistance is smaller than 10 omega, and the insulation resistance between the alternating current power supply input of the transmitter and the shell is larger than 20MΩ when tested by using a 500V megger.

3.1.3 general power cable connection and phase sequence inspection;

the method comprises the steps of disconnecting a transmitter main power supply and a water-cooling cabinet main power supply distribution box switch, connecting one end of a power supply cable into the distribution box according to requirements, separating a phase line from a neutral line, and preventing the connection from being wrong;

and secondly, opening two power switches of the distribution box, and measuring whether the output of the other end of the cable is correct or not by using a three-purpose table 700V alternating current gear, wherein the space between the main distribution plugs 1, 2 and 3 cores (phase lines) of the XXXC and XXXG transmitters is-380V, the space between 1, 2 and 3 cores and 4 cores (neutral lines) is-220V, the space between the main distribution plugs 1, 2, 9, 3, 4, 10, 5, 6 and 11 of the XX1 transmitters is-380V, the space between 1, 2, 9, 3, 4, 10, 5, 6 and 11 pairs of 7 cores (neutral lines) is-220V, and the space between 7 cores and 8 cores is-220V.

And after the inspection is finished, the distribution box switch is disconnected, and the main power supply of the transmitter and the water-cooling cabinet power supply are connected well.

3.1.4 powering on the transmitter and troubleshooting;

and closing a transmitter main power switch on the distribution box to check whether each part works normally.

The fan installed at the top of the modulating and discharging cabinet starts to work at the moment, and if abnormal sound exists, the fan is immediately turned off. The wind direction is to exhaust air outwards of the cabinet during normal operation, and if the cabinet fan is abnormal in operation, the cabinet fan is checked according to table 4 to remove faults:

table 4 cabinet fan failure and removal

The input power supply voltage of each shielding box is checked by using a three-purpose meter direct-current voltage file, and the normal numerical value is specifically shown in a table 5:

table 5 inspection of input supply voltage to each shielded box in a cabinet

If the input power supply voltage of the shielding box exceeds the standard range (generally + -0.5V), the input power supply is properly regulated, the total power supply is cut off after the inspection is finished, and the power plugs of all the shielding boxes are correspondingly connected;

turning on the main power switch again, the liquid crystal display of the monitoring circuit of the modulating cabinet should be on, and displaying a 'transmitter waiting for command input', and if the transmitter is not on or no character is displayed, indicating that the monitoring circuit has a problem, and should be replaced with a new one;

the titanium pump power supply in the row-discharge cabinet can work normally, a sharp whistle is sent out, the preheating key of the monitoring circuit panel is pressed, the modulating cabinet timer is started, the filament power supply in the row-discharge cabinet is provided with a voltage display, and if abnormal, whether the power supply of the low-voltage power component V2 relay in the modulating cabinet is sucked or not is checked.

(3) And after each part works normally, the power supply is turned off, and the preliminary power-on is completed.

3.1.5 Water-cooled Cabinet Power-on inspection

4.1.5.1XXXC and XXXG are cooled by primary water cooling and secondary air cooling, and are self-contained in the water-cooled cabinet without other auxiliary cooling equipment.

The cooling mode of XX1 is primary water cooling and secondary water cooling, wherein the primary water cooling is self-contained in the cabinet, and the secondary water cooling needs to pump the tap water in the large water tank prepared in advance by another water pump to provide cooling circulating water for the primary cooling liquid. Note that the water inlet and outlet pipes of the water pump and the three-phase input power supply of the water pump are required to be connected correctly, the water pipe channel is not required to be bent or blocked, and the smooth supply of the secondary cooling water with the maximum flow is ensured.

3.1.5.2 power-on checking step;

the method comprises the steps that a water-cooling cabinet main power switch on a distribution box is closed, at the moment, a white lamp on the left side of an electric control box of the cabinet is lightened, all indication lamps and meters are displayed, if the indication lamps and meters are not right, the three-phase distribution phase sequence is not right, two phase lines (in the distribution box) are randomly exchanged, and the water-cooling cabinet main power switch on the distribution box is closed after normal display;

immediately observing whether water leakage exists at all the joints between the travelling wave tube and the water-cooled cabinet after the water-cooled cabinet works normally, immediately removing if so, starting up for half an hour, and then observing whether water leakage exists at the joints or not, and immediately removing if so; if each part operates normally, the water-cooling cabinet is electrified.

3.1.6 checking a water cooling circulation cooling waterway;

preparing two barrels of cooling liquid of 25L each before first use, wherein the cooling liquid is a mixed liquid of 50% ethylene glycol and 50% deionized water prepared by a chemical room of a process;

the drain valve is opened to clean residual liquid in the water tank, and the drain valve is closed after the residual liquid is completely drained;

inserting a liquid adding pipe into the mixed solution of glycol and deionized water, opening a liquid adding valve and a water tank air discharging plug, rotating a liquid adding pump switch to an operating gear, starting the liquid adding pump to work, automatically adding liquid to the water tank in the water cooling cabinet, shifting the liquid adding pump switch to a stop gear until a water level display mark indicates the highest position, and closing the liquid adding valve;

the water pump control switch is rotated to the 'running gear', at the moment, the main pump starts to operate, the intelligent flow regulator has flow display, and the output flow of the cooling liquid is generally not less than 0.9m ³ /h (or 15L/min). If no flow is displayed, air possibly remains in the main pump, the main pump switch is rotated to stop, the exhaust plug on the main pump is slightly unscrewed by a wrench, the exhaust plug is not required to be unscrewed from the exhaust port, only a gap is required to be opened, otherwise, excessive coolant flows out to cause waste, and the exhaust plug is screwed after the air is exhausted.

3.2 transmitter modulation pulse waveform debugging

Modulation pulse waveform debugging is needed before the traveling wave tube is added to ensure the normal use of the traveling wave tube.

3.2.1 normal switching on and switching off sequences and debugging block diagrams of the transmitter;

(1) The normal switching sequence of the transmitter is as shown in fig. 3:

(2) The modulation pulse waveform debugging block diagram is shown in fig. 4:

3.2.2 modulating pulse waveform debugging step;

3.2.2.1 connecting a resistive load;

the test bed of the transmitter is well connected (mainly providing system charge and discharge triggering and long and short period switching), the power supply of the test bed is +5V, a three-purpose meter is used for checking that the load impedance of the high-voltage resistor is 3.4kΩ+/-0.1kΩ, R2 (formed by connecting ten RJ17-2-10Ω+/-5 percent in parallel) is connected with R1 in series, the high-voltage end of the R1 is connected into the No. 4 head of the filament power supply wiring board of the row discharge cabinet, the other end of the R2 is connected onto the grounding screw of the high-voltage capacitor assembly, and the oscillograph is connected into the two ends of the sampling resistor R2.

3.2.2.2 shielding from faults;

the method comprises the steps of carrying out short-circuit treatment on a modulating cabinet and a row-discharge cabinet door switch by using a nylon button, respectively sleeving two current sampling rings into the No. 2 head wiring of two high-frequency transformers of a rectifying unit so as to observe whether current waveforms output by a left inverter and a right inverter are normal, disconnecting a monitoring circuit plug X2, connecting a special testing cable of the monitoring circuit, and shielding a filament power failure, a charging overcurrent failure and a body current overlarge failure, wherein a test stand power supply is +15V.

3.2.2.3 transmitter preheating;

(1) Firstly, turning on a power supply of a transmitter, turning on a +15V power supply of a special test cable of a monitoring circuit and a +5V power supply of a transmitter test bed, and pressing a preheating key of a monitoring circuit panel;

(2) When the liquid crystal display shows that the transmitter stands by for 10 minutes, the transmitter is warmed up. (XXXG, XXXC, preheating time of 9 minutes)

3.2.2.4 inverter unit assembly input signal inspection;

(1) After the transmitter is preheated, a key of 'on high voltage' is pressed, when a liquid crystal display displays a 'transmitter transmitting mode', the voltage of the fuse input end in the left inverter and the right inverter to the negative end of the three-phase rectifier bridge stack is measured by using a three-purpose meter 1000V direct current voltage gear, the normal value of the voltage is +350V+/-50V, and if the voltage is not or is abnormal in output, the voltage can be checked according to a meter 6 to remove faults:

TABLE 6 inverter unit component input voltage fault and rejection

(2) The trigger waveforms of touch 1, touch 2, touch 3 and touch 4 of the inverter control circuit box are checked by using an oscilloscope in the modulation cabinet, and the correct trigger signal waveforms output by the inverter control circuit box are shown in fig. 5:

if the waveforms are not aligned then the fault is checked and cleared according to table 7:

table 7 inverter control circuit box output trigger signal failure and rejection

And when the XX1 transmitter does not have inversion output voltage feedback, the shortest trigger pulse period T of the inversion control circuit box is less than or equal to 165us, and the XXXC and XXXG transmitters T are less than or equal to 200us.

3.2.2.5 charge and discharge trigger signal checking

After the signals are checked, an oscilloscope is used for measuring whether the charging and discharging trigger signals on the charging and discharging command component in the charging and discharging cabinet are normal, and a special test point is arranged on the panel of the charging and discharging circuit box, and the waveforms of the special test point meet the relation shown in fig. 6:

if the waveform is abnormal then the fault is checked and removed according to table 8:

TABLE 8 charge and discharge trigger signal failure and removal

When the trigger signal and the charge and discharge trigger signal of the inversion control circuit are measured, the left inverter input fuse and the right inverter input fuse and the 500V output cables T1X7 and T1X8 of the modulation cabinet are not connected;

XX1 long and short period realizes the switch through toggle switch on the transmitter test bench.

3.2.2.6 inverter overcurrent fault function checking;

the inverter overcurrent fault function detection adopts a method of adding analog voltage for detection, and the specific detection steps are as follows:

the method comprises the steps of disconnecting all connecting cables of a rectifying unit in a modulation cabinet, drawing out and placing the unit, and properly placing detached cable heads without touching a high-voltage part, so that short circuit is avoided;

Disconnect distribution unit wiring board T2X10 in the modulation rack: (7, 8), (9, 10) are connected with the inside of the unit, the regulated power supply is turned on to place the output at about +5V, the power supply is turned off, and the positive terminal and the negative terminal of the power supply output are respectively connected with the wiring board T2X10 of the power distribution unit: (7, 8) are connected;

turning on a power supply of the transmitter, turning on a high voltage of the transmitter according to a program, turning on a stabilized voltage supply, slowly increasing an output voltage until an overcurrent 1 indicator lamp of a box panel of the inversion control circuit is on, simultaneously displaying an inverter fault by a monitoring circuit, and enabling the transmitter not to enter a transmitting state, wherein the output of the measured stabilized voltage supply is in a range of +12V+/-3V, the power supply is adjusted to +5V after the output of the measured stabilized voltage supply is qualified, a fault clearing key on the box panel of the monitoring circuit is pressed, the fault is cleared, and the power supply is turned off;

and then the positive terminal and the negative terminal of the stabilized voltage power supply are output to the power distribution unit T2X10: (9, 10) connecting, checking the fault of 'overcurrent 2', checking the fault of 'overcurrent 1', and recovering the machine after the checking is finished.

If the inverter control circuit does not report faults, the inverter control circuit is related to the N4, N6 and N8 integrated blocks in the inverter control circuit, if the monitoring circuit does not report faults, the inverter control circuit is related to the N9 in the inverter control circuit box and the monitoring circuit optocoupler N4, and the integrated circuits are replaced after specific reasons are found out.

3.2.2.7 left Lu Nibian device output voltage check;

(1) After the power-off, a power switch of a transmitter is disconnected, a fuse of a left Lu Nibian device is arranged, a multi-turn potentiometer on a panel of an inversion control circuit box is rotated to the bottom anticlockwise, 500V output cables T1X7 and T1X8 of a modulation cabinet are disconnected, the power-on and high-voltage of the inverter are started according to a program, meanwhile, an indication is needed to be provided for the gauge head of an inverter voltage on a cabinet door of the line-discharging machine, the voltage jumps from 0V to a certain voltage value and then slowly rises until the voltage of the inverter is increased to an overvoltage alarm jump high voltage, at the moment, an overvoltage indicator lamp of the inversion control circuit box is on, the inverter voltage jumps back to 0V, if the inverter voltage does not slowly rise but directly jumps to an alarm threshold, the RP2 potentiometer in the inversion control circuit box is required to be adjusted to rotate anticlockwise, the voltage rise slowly until the requirement is met, otherwise, the voltage is too high to be started when the resistance load is opened to high voltage;

(2) Inverter overvoltage fault function inspection: and (3) under the state, heightening the voltage, observing the voltage reading indicated by the gauge head of the 'inverter voltage', when the voltage reaches 560 V+/-40V, jumping the transmitter to high voltage, displaying the 'inverter fault', lighting an 'overvoltage' indicator lamp on the inversion control circuit box, if the fault range is too low, regulating the RP5 potentiometer clockwise, if the fault range is too high, regulating the RP5 potentiometer anticlockwise, regulating and starting up for observing the inverter voltage when the fault is reported for a plurality of times until the requirement is met, and generally about 580V. If the "inverter voltage" header after the boost has no output display, then the fault is checked and excluded according to table 9:

Table 9 inverter voltage output fault and removal

3.2.2.8 inverter single-pass output modulation pulse waveform inspection

(1) After the no-load inversion voltage of the left Lu Nibian device is normal, the machine is turned off, 500V output cables T1X7 and T1X8 of the modulation cabinet are connected, a potentiometer on a panel of the inversion control circuit box is turned on anticlockwise to be at the bottom, a high voltage is started according to a program, two heads of a cathode voltage and an inverter voltage on the panel of the row discharge cabinet are indicated, wherein the cathode voltage is about 6kv, the inverter voltage is about 100V, a simulated oscilloscope is used for checking a modulation pulse waveform, the connection is shown in fig. 4, and the waveform meets the project index requirements listed in a table 10:

table 10 modulation waveform index requirements

The specific waveform of the modulated pulse is shown in fig. 7 (a):

(2) Modulating the modulated pulse waveform into one period, the waveform is as shown in fig. 7 (b):

if the parameters of the modulated pulse waveform are not in accordance with the requirements, the artificial line waveform needs to be readjusted. If the high voltage is not applied after the power-on, the head of the 'cathode voltage' meter has no indication, the high voltage is ignited, the modulating pulse waveform is abnormal and other fault phenomena occur, the corresponding fault is checked and removed according to the content of the table 11:

table 11 fault checking and removal of negative electrode high voltage failure, sparking and modulated pulse waveform abnormality

(3) Checking the inverter output current waveform sampled by the left sampling loop should be as shown in fig. 8:

the multi-turn potentiometer on the panel of the inversion control circuit box is adjusted clockwise, the voltage of the inverter is increased, the current waveform T of the sampling ring is gradually reduced, the amplitude of U1 is increased, the amplitude of U2 is reduced, the width of 64us is unchanged, and the current waveform is not disordered. If the current waveform is abnormal or derated after boosting, then the fault is checked and removed according to table 12:

table 12 inverter output current waveform abnormal fault and removal

(4) And continuously adjusting the potentiometer to increase the voltage of the inverter, and simultaneously observing the current waveform and the modulation pulse waveform of the inverter until the voltage of the inverter is not increased, and if the modulation pulse parameter is not in accordance with the requirement, readjusting the artificial line.

3.2.2.9 right-path inverter output voltage checking;

and pressing a high-voltage off key, taking down a fuse of the left Lu Nibian unit component of the modulating cabinet, loading the fuse into the right-path inverter unit component, and accessing the other path of the oscilloscope into the right-path inverter current sampling ring. After the power-on, the waveform of the output current of the inverter and the waveform of the modulation pulse are observed on the oscilloscope to meet the requirements, and the specific steps are the same as those of the debugging of the left Lu Nibian device.

Because the output 350V end of the power distribution unit is connected with the high-capacity filter capacitor, the fuse needs to be assembled and disassembled for 3 minutes after the power distribution unit is shut down, and the fuse is operated after the capacitor is discharged, otherwise, the fuse can be ignited and the device can be damaged.

3.2.2.10 inverter dual-output modulated pulse waveform inspection;

the right-way inverter is powered off after being normal, a left-way inverter fuse is arranged after waiting for 3 minutes, a multi-turn potentiometer on a panel of an inverter circuit control box is rotated to the bottom anticlockwise, high voltage is started according to a program, a modulating pulse waveform is checked on an oscilloscope to meet the requirement of fig. 7, meanwhile, the left-way current waveform and the right-way current waveform of the inverter are observed to be stable, the waveform is slightly dithered (for inverter voltage feedback adjustment) under normal conditions, the waveform is stable and cannot dithered up and down, a manual line is required to be finely adjusted again if the modulating pulse waveform is unqualified, and faults are checked and removed according to a table 12 if the output current waveform of the inverter is abnormal. If each waveform meets the requirement, the potentiometer can be continuously regulated to enable the voltage of the inverter to be increased to 500V, and the modulation pulse waveform parameters meeting the requirement are recorded on the recording card until the cathode voltage reaches 30 kv.

The XX1 transmitter is divided into a long period state and a short period state, see FIG. 6, the parameters of the long period modulation pulse waveform and the short period modulation pulse waveform are required to be checked, the long period modulation pulse waveform and the short period modulation pulse waveform are switched on a test bed, and the cathode voltage difference of the long period modulation pulse waveform and the short period modulation pulse waveform are required to be smaller than 1kv, and the specific steps are as follows:

(1) Toggling a long period switch and a short period switch on a transmitter test bed to a long period to enable a charging and discharging trigger period T=XXXXus plus or minus 5us, rotating a potentiometer on a panel of an inversion control circuit box to the bottom anticlockwise, starting up a program to increase the voltage, and adjusting the potentiometer on the inversion control circuit box clockwise to enable the cathode voltage to reach 30kv plus or minus 0.5kv, and recording the reading of a cathode voltage meter head;

(2) Turning off the high voltage of the transmitter, and toggling a long period switch and a short period switch on a transmitter test bed to a short period to enable a charging and discharging trigger period T=XXXus plus or minus 5us;

(3) And under the condition that the potentiometer on the panel of the inversion control circuit box is not regulated, the voltage is increased, the reading of the 'cathode voltage' meter head is recorded, the absolute value of the difference between the two readings is smaller than 1kv, and if the absolute value is not in accordance with the requirement, the feedback resistor R54 in the inversion control circuit box is required to be regulated until the feedback resistor R54 is qualified.

3.2.3 high-voltage full-power aging of transmitter with resistive load

The method comprises the steps that a transmitter is started up according to a program and is boosted, the inverter voltage is regulated to be 500V, the head of a cathode voltage meter is about 30kv, and the inverter voltage of a long period and a short period of an XX1 transmitter is regulated to be 500V;

secondly, when the machine works stably, starting timing, continuously starting the machine for 4 hours without faults, if the machine has a problem, finding out reasons, and restarting timing after elimination;

the normal operation is carried out for 4 hours, then the machine is turned off, the temperature of each device is measured by a point thermometer, under the general condition, the temperature of a rectifying diode in a modulating cabinet is about 50 ℃, the temperature of a charging inductor in a row-placing cabinet is about 60 ℃, the temperature of a manual line is about 40 ℃, the temperature of a pulse transformer is about 50 ℃, and the temperature of a high-voltage resistor is about 90 ℃;

And finally, continuously starting high-voltage impact for 3-5 times, and if no problem exists, indicating that the high-voltage debugging of the modulator is finished.

When the transmitter is started by applying a resistor load, the modulating and discharging cabinet doors cannot be closed tightly, an air duct cannot be formed, the radiating effect is poor, a fan is required to blow air to the two cabinets, or a long-time starting device is easy to damage due to poor radiating;

in the starting process, two oscilloscopes are used for respectively observing whether the current sampling of the inverter and the modulation pulse waveform are abnormal or not, if yes, the reasons are found out, and faults are eliminated;

note that the position of the potentiometer pointer on the panel of the inversion control circuit box is not changed at will, and the voltage of the inverter is about 500V when the traveling wave tube is added;

if a problem occurs in the copying process, most of the problems are caused by device damage, and then whether related devices work normally can be checked in advance. The devices in the modulation and row-playing cabinet which are easy to damage are as follows: the rectifier unit comprises a silicon controlled rectifier V1 in an inversion unit assembly, rectifier diodes V1-V4 in a rectifier unit, a silicon controlled rectifier V3 in a charge-discharge silicon controlled rectifier unit, a buffer capacitor C3 in a charge silicon controlled rectifier unit and the like.

3.3 preparing the transmitter before loading the traveling wave tube;

3.3.1 transmitter warm-up time check;

the XXXC, XXXG transmitters preheat time was 9 minutes and XX1 transmitter preheat time was 10 minutes. The preheating time of the transmitter is set by software in the monitoring circuit, and is accurate as long as the monitoring circuit works normally.

The method comprises the steps of switching on a power supply of a transmitter, pressing a preheating key on a monitoring circuit panel, and timing by a timer when a liquid crystal display displays that the transmitter is ready to be preheated for 00 minutes;

secondly, when the liquid crystal display displays that the transmitter is standby and preheated for 10 minutes/9 minutes, the timer is pressed down to stop timing; the time taken for preheating was checked and should be 10 minutes/9 minutes.+ -. 0.1 minutes.

3.3.2 checking the fault function of the switch of the modulating cabinet and the row-discharging cabinet door;

the method comprises the steps that a modulating and placing cabinet door is opened, and a door switch is sealed by nylon buckles;

the transmitter power supply is connected, preheating is conducted, the door switch of the row-discharge cabinet is loosened, and the monitoring circuit liquid crystal display displays a door switch alarm;

thirdly, the nylon button is used for sealing the door switch of the row cabinet, and a fault clearing key of the monitoring circuit is pressed, so that faults can be cleared;

fourthly, loosening a door switch of the modulation cabinet, and displaying a door switch second alarm by the liquid crystal display;

fifthly, sealing the switch of the door of the modulating cabinet by using a nylon button, and pressing a fault clearing key of a monitoring circuit, wherein faults can be cleared;

after the inspection is finished, the power supply of the transmitter is cut off, and if the failure of a cabinet door switch is not reported, the failure is inspected and removed according to a table 13:

Table 13 "door switch one, two alarms" cannot report failure and troubleshoot

3.3.3 Water-cooled Complex failure function inspection

In this embodiment, only the low flow rate of the cooling liquid and the high failure detection of the water supply are extracted.

Setting fault alarm thresholds of 3.3.3.1 water-cooled cabinets;

the method for setting the liquid supply temperature threshold to 55 ℃ generally comprises the following steps: pressing the SEL key for 2 seconds, when the parameter setting state is displayed on the instrument by 'PV', pressing the 'T' key to 'PV', displaying 'AL 1', pressing the 'SEL' key, starting to flash the parameter displayed by 'SV', pressing the 'T' or 'T' key to set the parameter to 55 ℃, pressing the 'SEL' key for 2 seconds after setting is finished, storing the setting value and returning to the normal display state;

setting a liquid return temperature threshold to 60 ℃, wherein the setting method is the same as that in the step 1, and the threshold is set to 60 ℃;

third step, the liquid supply flow rate setting threshold is 0.9m ³ /h (XX 1) or 15L/min (XXXC, XXXG), XX1 transmitter setup method is as follows: pressing the "+point" key for 2 seconds, pressing the "mod" key to "RH" when the parameter setting state is displayed, pressing the "make" key again to call out the original setting value, and setting the parameter to 0.9m through the "make" and "×" keys ³ And (3) per hour, pressing a 'mod' key to save the set value and returning to a normal display state, wherein the setting method of the XXXC and XXXG transmitters is the same as that in the step 1, and the threshold value is set to be 15L/min;

The liquid supply resistivity (XX 1) is set to be 1.5MΩ cm, and the liquid supply conductivities (XXXC, XXXG) are set to be 8.5us/cm. The XX1 transmitter resistivity setting method is as follows: setting a switch on the back of the resistivity controller to be 'SET', adjusting a 'SET' potentiometer to enable a liquid crystal display to be 1.5, setting the switch to a 'measurement' position after the setting is finished, setting the XXXC and XXXG conductivities in the same way as the step 1, and setting a threshold value to be 8.5us/cm;

the XX1 transmitter liquid supply pressure setting threshold is 0.8MPa, and the specific setting method is the same as the step 1, except that the threshold value is 0.8MPa. Because XX1 transmitter secondary water-cooling uses the sea water in the actual working, the pressure is big, and draw water with the water pump under the debugging state, the pressure is less, so need to adjust the sea water pressure sensor threshold to minimum, otherwise the water-cooling reports "the sea water pressure is too low" trouble, unable normal start-up, the setting method is as follows: the left upper end protective cap of the seawater pressure sensor is unscrewed, the threshold pointer points to the lowest end by the adjusting knob, the head is not required to be screwed, and the protective cap is covered after the adjustment is finished.

3.3.3.2 for flow fault functional checks;

and (3) starting the transmitter to increase the voltage, setting the threshold value of the flow rate fault of the water-cooling cabinet to be higher than the normal display value of the flow meter, enabling the transmitter to jump back to a standby state, displaying the 'water-cooling comprehensive fault' by a monitoring circuit, setting the threshold to be a specified value, and pressing the 'fault clearing' key of the monitoring circuit to clear the fault.

3.3.3.3 liquid supply temperature Fault function inspection

And (3) starting the transmitter at high voltage, setting a liquid supply temperature fault threshold value of the water-cooling cabinet to be lower than a normal display value of a liquid supply thermometer, enabling the transmitter to jump back to a standby state, displaying 'water-cooling comprehensive fault' by a monitoring circuit, setting the threshold to be a specified value, and pressing a 'fault clearing' key of the monitoring circuit, wherein faults can be cleared.

If the water cooling fault can not be displayed on the monitoring circuit, checking whether a communication interface module communication indicator lamp in the water cooling cabinet flickers, if not, replacing the module, and if normal, replacing the monitoring circuit.

3.3.4 filament Power output and failure function inspection

3.3.4.1 filament power supply no-load output voltage check

(1) Cutting off the power supply of the transmitter, removing the test cable connected to the X2 socket of the monitoring circuit, releasing the fault of the filament power supply, taking the fuses of the left and right inversion units away to ensure the safety when detecting the fault, and disconnecting the resistor load from the high-voltage line of the filament power supply of the transmitter to be connected with the ground wire;

(2) The power supply of the transmitter is connected, a preheating key is pressed, at the moment, the voltage gauge head of the filament power supply is indicated, a yellow lamp on the panel is lighted, a half filament (half voltage) works, after half a minute, a green lamp on the panel is lighted, a full filament (full voltage) works, after the no-load voltage of the filament power supply is normal, a potentiometer on the panel is regulated, the output voltage is regulated to 10V, the voltage of the 3 head and the 4 head of the filament power supply wiring board is monitored by a three-purpose meter during regulation, the 4 is a positive end, and the 3 is a negative end;

(3) If the preheated filament power supply has no voltage indication, checking and removing faults according to a table 14, and if the preheated filament power supply directly jumps to the full filament to work, a delay relay in the filament power supply is damaged, and the filament power supply is replaced.

Table 14 filament power supply output abnormal fault and elimination

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3.3.4.2 filament power failure function inspection;

the filament power failure function inspection adopts a simulation method to inspect, namely, the change of the filament resistance of the traveling wave tube is simulated by the change of the resistance value of the rheostat.

(1) Cutting off the power supply of the transmitter, connecting the transmitter to a filament power failure test bed, and connecting wires as shown in fig. 9:

(2) The parameter display box is disassembled, the cover plate is opened so as to adjust the potentiometer, the potentiometer is not touched with other devices, and the resistance value of the slide rheostat is placed in the middle position;

(3) The transmitter power is turned on, the preheating key is pressed, and after 3 minutes, the rheostat is adjusted to enable the ammeter to indicate about 8A. Adjusting the potentiometer R35 in the parameter display box to enable the 2-pin direct current voltage of the integrated circuit N4 to be about 4.5V, adjusting a rheostat, when the current is smaller than 6.5 A+/-1.5A or larger than 11.5 A+/-1.5A, the transmitter jumps back to low voltage, the monitoring circuit displays 'filament power failure', if the current exceeds the range, the potentiometer R35 in the parameter display box is adjusted according to the actual size, and if the failure can not be reported, the detection is carried out:

a. When the filament power supply works normally, pins 1 and 2 of the filament current transformer on the high-voltage resistance unit can sample the voltage with the frequency of 50Hz and the peak-peak value U of about 9V, as shown in figure 10, and if no output exists, the filament transformer is replaced;

b. if the sampling current exists, checking whether high-level input not smaller than 10V exists between the 11 heads and the 12 heads of the 'filament power failure' alarm input X2 of the monitoring circuit, if so, replacing the monitoring circuit, and if not, replacing the parameter display box.

3.3.4.3 travelling wave tube adds filament voltage

After the filament power failure function is checked to be normal, the power failure is recovered, the cathode of the filament of the traveling wave tube is connected to the 4 head of the filament power wiring board, the hot wire is connected to the 3 head, after the total power supply of the transmitter is connected and preheated for one minute, the potentiometer on the filament power panel is monitored and regulated by the three-purpose meter voltage gear, so that the output voltage is consistent with the hot wire voltage of the nameplate on the traveling wave tube.

3.3.5 charging overcurrent Fault function check

Taking out fuses of left and right inverters of the transmitter, starting high voltage of the transmitter according to a program, returning the transmitter to a standby state after about 10 seconds, displaying a charging overcurrent fault by a monitoring circuit, simulating the condition that the inverters are short-circuited, namely, charging and discharging thyristors are simultaneously conducted, checking whether a voltage sampling circuit of a power supply assembly of a modulating cabinet and the monitoring circuit are correctly wired if the faults are not reported, replacing the monitoring circuit if the faults are correct, and recovering after the checking is finished.

3.3.6 titanium Pump overcurrent Fault function inspection

The overcurrent fault function of the titanium pump is checked as follows:

(1) The wiring of the titanium pump power supply is taken down from the traveling wave tube in the traveling wave cabinet, one end of a resistor (formed by connecting 10 RJ-2-330kΩ+/-5% resistors in series) connected with 3.3MΩ is connected with the positive end of the titanium pump power supply, and the other end is connected with the negative end, so that the titanium pump power supply is not in collision with other devices to cause short circuit;

(2) Switching on a power supply of the transmitter, wherein a monitoring circuit should display a 'titanium pump overcurrent alarm', and the transmitter cannot enter a transmitting state;

(3) And cutting off the power supply of the transmitter, and connecting the wiring of the titanium pump power supply back to the original position.

If the fault can not be reported, checking whether high-level input of not less than 10V exists between 7 and 8 heads of the monitoring circuit X2, if so, replacing the monitoring circuit, and if not, checking whether the titanium pump power supply is normal.

3.4 transmitter adds traveling wave tube high pressure aging

After the fault protection function is checked, all wiring in the cabinet is confirmed to be recovered again, the traveling wave tube waveguide load is connected well, the waveguide fixing screw needs to be knocked down to prevent microwave leakage, and the position of the potentiometer on the panel of the inversion control circuit box needs to be consistent with that of the resistor load.

3.4.1 starting up the transmitter and increasing the voltage;

(1) Switching on a power supply of the transmitter, and heightening the voltage according to a starting program, wherein the head of a cathode voltage meter of a panel of the row-discharge cabinet is provided with a high-voltage indication of more than 31 kv;

(2) After the high voltage is normal, a potentiometer on the panel of the inversion control circuit box is adjusted to enable a 'cathode voltage' gauge head indication value to be consistent with a 'synchronous voltage' value on a nameplate of the traveling wave tube, a 'collecting electrode current' gauge head indication value to be consistent with a nameplate value on the traveling wave tube, and a 'cathode current' gauge head indication value is larger than a 'collecting electrode current' gauge head, and an error is smaller than 2A;

(3) All cabinet doors are tightly closed, the machine can work normally, and if faults occur, the machine is banked again after being removed.

3.4.2 fault function inspection of the 'body current overlarge' of the traveling wave tube;

the BNC plug of the collector current transformer T4 on the traveling wave tube assembly in the running cabinet is disconnected, the starting up is conducted with high voltage, the transmitter cannot enter the transmitting state, meanwhile, a monitoring circuit displays a 'body current overlarge' fault, after the checking is finished, the machine is restored, and if the fault is not reported, the fault is checked and removed according to a table 15:

table 15 traveling wave tube "body current too large" fault cannot be reported and removed

3.4.3 the problem and the method for eliminating the problem easily occur when the transmitter is opened after being added with the traveling wave tube and is aged at high pressure;

the problem easily occurring when the transmitter is opened at high pressure after being added with a traveling wave tube and the removing method are shown in table 16:

table 16 transmitter with traveling wave tube aging fault and elimination

3.5 transmitter power, spectrum, envelope adjustment

3.5.1 transmitter test power, spectrum, envelope block diagram

The transmitter test power, spectrum, envelope block diagram is shown in fig. 11:

3.5.2 transmitter standing wave oversized fault function check

The step of checking the function of the oversized standing wave fault of the transmitter is as follows:

the standing wave protection box in the descending cabinet is disassembled, a T1A5X3 plug is disconnected, a front cover plate is opened, other plugs are well connected, and the standing wave protection box is properly placed and is not in collision with other devices;

the pulse signal source output is connected to the standing wave protection unit T1A5X3, meanwhile, an oscilloscope is used for monitoring the output signal, the PRI=1ms is set, and the amplitude=1.8V is set;

turning on a power supply of the transmitter, regulating a multi-turn potentiometer RP1 in the standing wave protection box to enable the amplitude of 2 pins and 3 pins of an integrated circuit N2 to be equal, finely regulating the potentiometer to enable the 1 pin to be in a critical state from low level to high level, turning off the power supply of the transmitter after the regulation is finished, and recovering the standing wave protection box;

the output amplitude of the pulse signal source is reduced to 1V, the high voltage of the transmitter is developed, the output amplitude of the pulse signal source is slowly increased until the transmitter hops to high voltage, at the moment, the monitoring circuit displays a 'standing wave oversized' fault, at the moment, the signal amplitude of the signal source is 1.8V plus or minus 0.2V, if deviation exists, the RP1 potentiometer in the standing wave protection box is properly regulated until the requirement is met.

If no fault is reported, checking whether high-level input of not less than 10V exists between 25 heads and 26 heads of the monitoring circuit X2, and if yes, replacing the monitoring circuit; and disconnecting the standing wave protection control circuit T1A5X2 plug, checking that the output ends of the socket A and the socket B are at a high level not less than 10V, and checking V1 if not: 3DK4C and N2: whether the LM193 is damaged or directly replaced.

3.5.3 traveling wave tube input pulse power inspection

The input pulse power inspection steps of the traveling wave tube are as follows:

(1) Setting a signal source: the phase noise of the signal source is less than or equal to-75 dBc/Hz/1kHz (frequency bands XXGHz-XXGHz), if the phase noise is not good, the frequency spectrum improvement factor limiting index is not qualified in test, and the debugging is affected. The pulsin socket of the signal source backboard is connected with the discharge trigger output on the transmitter test bed so as to ensure that the radio frequency output is synchronous with the discharge trigger. And (3) turning on a +5V power supply and a signal source power supply of the transmitter test bed, wherein the signal source is set as follows: freq (frequency) is set to XXGHz, level (amplitude) is set to 6dBm, pulse is selected to be International, pulse single is selected to be on, W1 is set to be XXus, D1 (delay) is set according to the time difference between radio frequency output and discharge triggering, and Trigger is selected to be Trigger W/delay;

(2) After the power meter power supply is connected for 30 minutes, calibrating the power meter, connecting the signal source output to a radio frequency excitation port of a T1X4 socket at the top of the row amplification cabinet through a high-frequency cable, finely adjusting the signal source output power to ensure that the radio frequency excitation port power is about 0dBm, and after the completion, putting a signal source radio frequency output switch into an RF OFF state;

(3) Removing an input power cable head of a traveling wave tube in a downstream amplification cabinet, adding a 20dB attenuator to access a power meter, adjusting a mechanical attenuator on a 2W power amplification module panel to the middle position of a scale, accessing an attenuation code test bed, dialing attenuation codes to 001100, switching on a power supply of a transmitter and the test bed, switching on the output of a signal source, adjusting the attenuation code to enable the output of the 2W power amplification module to meet the pulse input power requirement of the traveling wave tube, recording attenuation code values of all test points, removing the power meter and connecting the cable after the test is finished;

if the input power of the traveling wave tube does not meet the requirement, checking whether the attenuation code test bed is normal or not and whether the input power of the 2W power amplifier module and the panel indicator lamp are normal or not, and if so, replacing the 2W power amplifier module.

3.5.4 transmitter radio frequency envelope, power debug

Referring to fig. 11, a calibrated power meter is added with a 20dB attenuator to be connected to a 3 port of a directional coupler, and the connection is important, otherwise, the power test is greatly affected. The signal source is set and the radio frequency output switch is set to the "RF OFF" state. Connecting an oscilloscope to a detector of a T1X5 socket at the top of a row-placement cabinet, and recording the coupling degree of each point of a port 3 of a directional coupler;

when calculating power, adding 20dB attenuation value;

All indicators should be tested after 30 minutes of switching on the high pressure.

The transmitter and the test bed power supply are connected, the high voltage is turned ON according to a program, the signal source radio frequency output switch is set in an 'RF ON' state, the frequency point is '00' (namely XXGHz), at the moment, the oscilloscope has a radio frequency envelope output, and the waveform is shown in figure 12:

the rf envelope index is shown in table 17:

table 17 radio frequency envelope specification requirements

Sequence number	Index name	Index requirements	Remarks
				1	Pulse width	τ＝xxus±1us	(tested by amplitude 90%)
2	Rising edge	τ _q ≤xxus	(tested according to the amplitude of 10% -90%)
				3	Falling edge	τ _h ≤x us	(tested according to the amplitude of 10% -90%)
4	Roof drop	△u/u≤7％

The input impedance of the oscilloscope is selected to be 50 omega, and the input impedance is matched with the output impedance of the detector.

If the output pulse width is not in the index range, the delay time D1 of the signal source can be properly regulated, the power and envelope of the transmitter need to be debugged, at the moment, the power meter should also have power indication, the coupling degree of the frequency point '00' (coupling degree of the directional coupler+20 dB attenuator attenuation value) is input into the power meter, the output power of the traveling wave tube is directly read out, if the requirement is not met, the attenuation code can be properly regulated to change the excitation output of the 2W power amplifier module so as to enable the output pulse power to meet the requirement, if the requirement is still not met, the cathode high voltage needs to be increased, the influence of the high voltage on the power of the low-end frequency point is larger, the envelope of the frequency point '00' needs to be simultaneously focused to meet the index when the power is debugged, after the adjustment of the envelope and the power of the frequency point '00' is completed, other points are debugged one by one, and all debugging data are recorded.

The specific detection and elimination method for the low output power of the traveling wave tube is shown in table 18:

low power fault and elimination of table 18 travelling wave tube output

3.5.5. Transmitter radio frequency spectrum debugging

(1) After the RF envelope and power of the transmitter are debugged, the probe of the power meter is disassembled and connected to a testing cable of the frequency spectrograph (20 dB attenuator is needed) by referring to FIG. 11. The spectrometer settings for testing main-side lobe ratio, in-band spurious suppression, and improvement factor limit are shown in table 19:

table 19 spectrometer setting method

Setting items	Ratio of main lobe to auxiliary lobe	In-band spurious suppression	Improvement of factor restriction
				RBW	10kHz	300kHz	10Hz
VBW	10kHz	300kHz	10Hz
				SWEEPTIME	10s	10s	10s
SPAN	500kHz	500MHz	3kHz

(2) If the noise frequency suppression in the spectrum band is not less than 50dB, checking whether the setting of the spectrometer is correct or not, and if not, checking whether the noise frequency suppression output by the signal source and the 2W power amplifier module meets the requirement or not in a sectional mode, wherein the amplitude of the output signal cannot be too small;

(3) The main and side lobe ratio should not be less than 12dB, if not meeting the requirements, checking according to the method;

(4) The improvement factor limit should be no less than 45dB, calculated using the following equation:

I＝(P-N)dBc+10lg(10Hz/1Hz)-10lg(PRF)，

where PRF is the pulse repetition frequency (in Hz),

before testing, 10M Ref Out of a spectrometer is connected to 10M Ref In of a signal source by using a two-head BNC cable, the signal is connected, after spectrum averaging is carried Out for 10 times, the power P of a main spectrum line of a main frequency is read Out by using a spectrometer marker mark, the bottom noise power N In a 200Hz range between the two spectrum lines is measured by using the marker mark, if the index is unqualified, whether the phase noise of the signal source meets the requirement is firstly checked, if the index is not met, the signal source needs to be replaced, and then whether an improvement factor output by a 2W power amplification module meets the requirement is checked.

3.5.6 test data record

Recording all test data, after all indexes are debugged to be qualified, starting up and aging for 8 hours, and if faults exist, aging again after the faults are removed.

Fourthly, performing three-proofing treatment on a transmitter;

cutting off the power supply of the transmitter, removing all the test tables and connecting lines of the cabinet, connecting all the plugs in the cabinet, transporting the cabinet to the three-proofing group, removing the left and right inversion unit components of the modulating cabinet by debugging personnel, withdrawing the rectifying unit from the cabinet by the connecting cable of the rectifying unit, paying attention to the fact that the lines are not broken during operation, recovering the three-proofing by the debugging personnel after the three-proofing is finished, and reminding the three-proofing personnel that high-voltage parts such as a filament power supply component, a high-voltage capacitor component, a high-voltage resistor component and the like are not sprayed with the three-proofing paint.

Re-measurement of indexes after three-proofing of a transmitter;

and after the three-proofing of the transmitter, all indexes are retested according to the acceptance rule until the indexes meet the requirements, and if the indexes meet the requirements, the method is used for removing faults according to the prior art.

And after each index of the transmitter is tested to be qualified, the transmitter is debugged.

The technical scheme of the invention is not limited to the embodiments, and all technical schemes obtained by adopting equivalent substitution modes fall within the scope of the invention.

Claims

1. A method for electrifying and debugging a traveling wave tube transmitter comprises a row-laying cabinet, a modulation cabinet and a water-cooling cabinet which are connected in sequence,

The debugging method is characterized by comprising the following steps of:

step one, electrifying a transmitter at low voltage;

step 1.2, checking cabinet grounding and insulation resistance;

step 1.4, powering on a transmitter and detecting faults;

step 1.5, carrying out electrifying inspection on the water-cooled cabinet;

step 1.6, checking a water cooling circulation cooling water channel;

step two, modulating pulse waveforms;

step 2.1, connecting a transmitter with a resistor load;

step 2.4, checking an overcurrent fault function of the inverter;

step 2.7, checking the output voltage of the right-path inverter;

step 2.8, checking the two-way output modulation pulse waveform of the inverter;

step three, preparing the transmitter before loading the traveling wave tube;

2. The method for powering up and debugging a traveling wave tube transmitter according to claim 1, wherein the method comprises the following steps: in step 1.1, when the row-placed cabinet, the modulation cabinet and the water-cooled cabinet are connected with the distribution box, a T1X1 plug of the row-placed cabinet is connected with a T2X3 plug of the modulation cabinet through a row-placed distribution cable, and a T1X2 plug of the row-placed cabinet is connected with a T2X4 plug of the modulation cabinet through a row-placed signal cable; the T2X1 plug of the modulation cabinet is connected with the distribution box, and the T2X5 plug of the modulation cabinet is connected with the T3X2 plug of the water-cooling cabinet through a water-cooling signal cable; the T3X1 plug of the water-cooled cabinet is connected with the distribution box.

3. The method for powering up and debugging the traveling wave tube transmitter according to claim 2, wherein the method comprises the following steps: in step 2.1, the resistive load impedance is 3.4kΩ±0.1 kΩ.

4. The method for power-on debugging of a traveling wave tube transmitter according to claim 3, wherein the third step specifically comprises:

step 3.1, checking the preheating time of a transmitter;

step 3.3, checking the water cooling comprehensive fault function;

step 3.5, checking a charging overcurrent fault function;

and 3.6, checking the overcurrent fault function of the titanium pump.

5. The method for power-on debugging of a traveling wave tube transmitter according to claim 4, wherein the step 3.3 specifically comprises:

step 3.3.1, setting each fault alarm threshold of the water-cooling cabinet;

step 3.3.2, checking the function of the flow fault of the liquid supply;

and 3.3.3, checking the function of fault of the liquid supply temperature.

6. The method for power-on debugging of a traveling wave tube transmitter according to claim 5, wherein the step 3.4 specifically comprises:

step 3.4.1, checking the no-load output voltage of the filament power supply;

step 3.4.2, checking a filament power failure function;

And 3.4.3, applying filament voltage to the traveling wave tube.

7. The method for powering up and debugging a traveling wave tube transmitter according to claim 6, wherein: the fourth step specifically comprises: and (3) starting up the transmitter and checking the fault function of high voltage and overlarge body current of the traveling wave tube.

8. The method for powering up and debugging a traveling wave tube transmitter according to claim 7, wherein: the fifth step specifically comprises the following steps: detecting the oversized standing wave fault function of the transmitter; checking the input pulse power of the traveling wave tube; the radio frequency envelope and the power of the transmitter are debugged; transmitter radio frequency spectrum debugging.