Technical Information

TI-013 Rev.5

May 23, 2023

-Notice of Proprietary Information-

This document and its contents are proprietary to Nisshinbo Micro Devices Inc.

This publication and its contents may not be reproduced or distributed for any other purpose without the written permission of

Nisshinbo Micro Devices Inc.

Contents listed in this document are subject to change at any time.

High power magnetrons Handling Procedure

1. TRANSPORTATION

For your transportation of these magnetrons, use the original packaging, which is shipped from

Nisshinbo Micro Devicesʼ factory. The magnetron is gotten into the double boxes for absorbing

mechanical shock and vibration. This original package has been designed following our criterion of

magnetron transportation. The magnetron integrated with the permanent magnet should be

handled as Magnetized Material in IATA regulation for air transport but can be transported by air

following Package instruction 902.

2. HEALTH AND SAFETY HAZARDS

Magnetrons are safe to handle and operate. The relevant precautions stated herein must be

treated appropriately. Equipment manufacturers and users must ensure that adequate precautions

are taken. Appropriate warning labels and notices must be provided on equipment and in operating

manuals.

High Voltage

Equipment must be designed so that personnel cannot come into contact with high voltage circuits.

All high voltage circuits and terminals must be enclosed. Fail-safe interlock switches must be fitted

to disconnect the primary power supply and discharge all high voltage capacitors and other stored

charges before allowing access. Interlock switches must not be bypassed to allow operation with

across doors open.

X-Ray Radiation

For only the magnetron that is applied over 20 kV of anode voltage.

Never apply high voltage without preparing X-ray shielding in place. High voltage magnetrons

emit a significant intensity of X-rays from the input insulation section. These rays can constitute a

health hazard unless adequate shielding for X-ray radiation is provided.

TI-013 Rev.5

RF Radiation

Personnel must not be exposed to excessive RF radiation. High voltage magnetrons not only emit

RF energy from the RF output but also leak one from the input insulation section. All RF connections

must be correctly fitted before operation so that no leakage of RF energy can occur and the RF

output must be coupled efficiently to the load. Personnel must maintain sufficient clearance away

from the magnetron while the device is energized. It is particularly dangerous to look into an open

waveguide while the magnetron is energized.

Magnetized materials

For only the magnetron integrated with the permanent magnet.

Take off your watch and keep the distance the accurate instruments from the magnetron.

Magnetic materials must not be permitted at any time closer than 200 millimeters from the tube.

Any energized magnets must not be permitted at any time closer than 300mm from the tube..

3. INSTALLATION

Fastening and connecting the earth lead wire

The earth (Positive of the high anode voltage) lead wire from the high voltage output of the

modulator to the magnetron flange (or instructed connecting point) shall be directly fastened and

connected for keeping safety.

Insulation space

Keep the insulation space around the input section of ceramic and terminals including the lead

wires.

Waveguide connecting

At the connecting magnetron output waveguide to the RF transmission line, the alignment of the

waveguide flange of the system should be fitted to the magnetron waveguide flange without any

mechanical thrust force. Then connect an earth lead wire from the modulator output to connect

to this flange using at least 1 spots recommended.

Pressurize the inside of the waveguide

For only the required type of magnetron in the specification sheet.

Test the air leakage at the applied maximum pressure. The maximum leakage will be such that

the pressure will not drop by more than 70 kPa in 7 days with an enclosed volume of 1 liter.