2450MHz 6kW Magnetron - relltubes.com

2450MHz 6kW Magnetron YJ1600B

40W267 Keslinger RoadPO Box 393, LaFox, IL 60147 USA

1.800.348.5580 (USA & Canada)1.630.208.2200 (International)www.rell.com | [email protected]

Electronics assumes no responsibility for any errors which may appear in this document. No part of this document may be copied or reproduced in any form or by any means without the prior written consent of Richardson Electronics, Ltd.

Last Updated: 11-2014Revision: RA.0-JB14

Description:

Characteristic Parameters:

The YJ1600B is a fixed frequency, continuous wave magnetron with an output power from 5kW to 6kW and a frequency range from 2450MHz to 2470MHz used in industrial heating applications. The tube contains a sub-electromagnet used to vary output power. The anode is water cooled and the antenna and filter box both require forced air cooling. A low pass filter set in the filter box prevents spurious leakage from the cathode stem.

Frequency: 2460 ± 10 MHz (at matched load) Power: 5 - 6 kW (at matched load) Load VSWR: 2.5 (max.) Load VSWR phase: sinkRecommended Operation: ContinuousFilament Voltage (Operational): 0.5 Vac (nominal)Filament Voltage (Stand-by): 5.0 ± 0.2 Vac (4.5V min., 5.5V max.) Filament Current (Stand-by/Starting): 33 AFilament Surge Current: 85 ACold Filament Resistance: 0.023Pre-heating time: 10 sec (nominal) Anode Voltage: 8 kV (peak) 10 kV (peak surge for 0.1 sec)Average Anode Current: 950 - 1150 mA (nominal)Magnet: Ferrite magnet packaged with sub-electromagnetElectromagnet coil current: -2 Adc (min.), 0 Adc (max.)Voltage Between Coil and Tube: 48 Vdc (max.) Thermal Switch Rated Voltage: 125 Vac (max.)Thermal Switch Rated Current: 15 A (max.)Thermal Switch Operating Temperature: ON at 60ºC ± 10ºC OFF at 80ºC ± 10ºCExpected Life: 500 hr (min.)Cathode Potential: Ground

Electrical

Note: Specifications subject to change without notice.






Characteristic Parameters (continued):

Mounting Position: AnyCathode Type: Directly heated thoriated tungsten filamentCooling: Anode: Water, 2.5 L/min (nominal) Output Antenna: Forced air, 60 L/min (nominal) Filter Box: Forced air, 120 L/min (nominal)Water Pressure: 0.49 MPaCooling Water Outlet Temperature: Closed Cooling Circuit: 75ºC (max.) Open Cooling Circuit: 65ºC (max.)Filter Box Air Inlet Temperature: 50ºC (max.)Ambient Operating Temperature: 60ºC (max.)Anode Temperature: 85ºC (max.)Seal Temperature: 220ºC (max.)Storage Temperature: -30ºC (min.), 60ºC (max.)Storage Humidity: 95% RH (max.)Weight: 4.3 kg (nominal)

Mechanical


Notes:

1. None of the maximum ratings should be exceeded under any circumstances even for an instant or a transient, since to do so may cause damage to the tube. A combination of the maximum rating conditions can not be guaranteed.2. All the voltage parameters are in reference to the cathode voltage.3. Filament voltage must be immediately reduced after applying the anode voltage in accordance with figure 4.4. Electromagnet information: resistance = 4.1 , inductance = 20mH5. See figure 2.6. See figure 3.

5

6

6






Performance Characteristics:


Figure 1: Recommended Start Sequence for Frequent ON/OFF Operation






Performance Characteristics (continued):


Figure 2: Pressure Drop and Max Inlet Temperature vs. Anode Cooling Water Flow

Figure 3: Pressure Drop For Output Antenna and Filter Box Cooling vs. Airflow

Figure 4: Optimum Filament Voltage vs. Average Anode Current








Figure 5: Performance Chart

Operating Conditions:

Power Supply: Three phase full wave rectified with choke coil to suppress the peak anode current Filament Voltage: In accordance with figure 4. Load VSWR: 2.5:1 Load VSWR phase: SINK This is measured within 15 seconds after applying the anode voltage








Figure 6: Rieke Diagram

Operating Conditions:

Power Supply: Three phase full wave rectified with choke coil to suppress the peak anode current Filament Voltage: 0.5 Vac Average Anode current: 950 mA (constant) Peak Anode Voltage: 7.1 kV (at matched load) Oscillating Frequency: 2460 MHz (at matched load)








Figure 7: Typical Leakage Magnetic Field Characteristics

Note 1: Measurements taken while electro-magnet current = 0A.Note 2: Direction of leakage magnetic field is shown in outline drawing.






Outline Drawing:

Note: Specifications subject to change without notice. Dimensions shown are nominal values unless stated otherwise.

units: mm






Negative Factors Affecting the Life of Magnetron:


Life of the magnetron is strongly affected by the operating conditions. YJ1600B should be operated under the typical operating conditions. We also recommend strongly that YJ1600B is operated substantially continuously. Tube users should give operating conditions that affect the life negatively their careful considerations.

( 1) Frequent ON/OFF operationa) We recommend the start sequence described in Fig 1 when the accumulated ON/OFF times over the total life span of the tube reach 10,000. In this case, average ON/OFF, times per hour is over 2. If other mode start sequence is used, the life cannot be guaranteed.b) If the accumulated ON/OFF times over the total life span of the tube reach 30,000,the life cannot be guaranteed generally. In this case, average ON/OFF times per hour is over 5.

(2) Low power operationa) Life of low power operation with the average anode current lower than 150 mAcannot be guaranteed. Generally, low power operation is not advisable even though the average anode current is over 150 mA.It is desirable that staying in low power operation is less 3 mins. When the average anode current is reduced to reduce the output power by changing the tube electromagnet current, the power supply voltage increases generally because of its internal impedance. In this case, it is required that the anode voltage including its fluctuation in low power operation does not exceed its maximum rating.b) If the accumulated wide range power change times over the total life span of the tube reach 30,000, the life cannot be guaranteed generally.

Safety Precautions:

Carefully take the following precautions for safety in using the magnetrons for industrial applications. Magnetrons must be handled by individuals possessing adequate backgrounds of electrical, electronic, microwave, mechanical and-environmental experiences.Richardson Electronics cannot be responsible for the interpretation of this information, nor can it be assumed any liability in connection with its use.

1. High voltage Since the magnetron is operated with negative high potential at the cathode terminals, a special care must be taken as follows. 1.1 Do not touch nor come close to the cathode terminals or their surroundings during operation 1.2 To avoid shock hazards, never insert metallic wire or like into the filter box, and never operate the magnetron with the lid of filter box open. 1.3 Before removing the magnetron from the oven, carefully check that the power is turned off, and discharge the cathode terminal or the capacitors in the power supply circuit by using the discharging rod adequately designed for safety.






Safety Precautions (continued):


Power Supply Connection

2. Radiation X-ray High voltage microwave tubes emit a significant intensity of X- rays when the operation voltage exceeds about 10 kV. The X-rays constitute a health hazard unless adequate shielding is provided. This is a charac teristic of all microwave tubes and the X-rays strength emitted correspond to the anode voltage applied.

3. Radiation leakage Care should be taken for radiation leaked from the magnetron, though the leakage from the input part of magnetron is restricted to a level which human body is not adversely affected.

3.1 Properly install and tightly fasten the magnetron in the oven or in the waveguide coupler. 3.2 Do not deform the gasket or do not operate the magnetron with the gasket removed, to avoid hazardous conditions such as radiation leakage and arcing. 3.3 Never operate the magnetron without installing it in the oven or with the output antenna exposed. 3.4 Do not remove the lid of the filter box nor deform the filter box. 3.5 Always keep your eyes apart from the operating magnetron in consideration of the unexpected hazardous conditions.

4. Temperature Although the magnetron is subjected to water cooling and forced air cooling during operation, high temperature (sometimes more than 200°C) is observed on the enclosure of magnetron. Care should be taken as follows. 4.1 Do not touch the magnetron immediately after turning power off. Allow the magnetron to cool before handling. 4.2 Putting on cotton gloves or the equivalent is recommended for safe handling.






Safety Precautions (continued):


5. Magnet This magnetron has both the permanent magnet and electromagnet. This permanent field is over 0.15T (1500 gauss). Care should be taken as follows.

5.1 Do not put the magnetic material near the magnetron, in order to avoid the injury caused by the collision of the magnetic material to the magnetron. 5.2 It is not recommended that a person who uses a pacemaker handles the magnetron, because the magnetic field leakage from the magnetron may affect the function of it. 6. Others

6.1 Care should be taken or cooling systems (cooling water and air) before the operating magnetron, in order to avoid the ignition caused by the stop of cooling systems. 6.2 The cooling air system sets the filter, in order to avoid the broken down voltage caused by the dust and the mist. 6.3 Richardson Electronics can not be responsible for trouble which is caused by the reconstruction of our magnetron by a set maker, a service person, or an end-user.

2450MHz 6kW Magnetron - relltubes.com

Documents

Transcript of 2450MHz 6kW Magnetron - relltubes.com