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TOSHIBA Industrial Magnetron E3327
NEGATIVE FACTORS AFFECTING THE LIFE OF MAGNETRON
Life of the magnetron is strongly affected by the operating conditions.
E3327 should be operated under the typical operating conditions. We also recommend strongly that
E3327 is operated substantially continuously. Tube users should give next operating conditions that
affect the life negatively their careful considerations.
(1) Frequent ON/OFF operation
a. 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 operation
a. Life of low power operation with the average anode current lower than 150 mA cannot 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 min.
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.
(3) Without isolator (circulator) operation
Life can be guaranteed only on the load impedance of VSWR 2.5 in SINK PHASE.
note) Information in this document is subject to change without notice.
© 2021 Toshiba Hokuto Electronics Corporation
Rev. 20211217
4
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