Alter® SM 845
Air-cooled Switch Mode Microwave Power Supply for 2kW, 2.45 GHz Magnetrons

Alter SM 845Air-cooled Switch Mode Microwave Power Supply for 2kW, 2.45 GHz Magnetrons - click to enlarge
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The Alter SM 845 is an air-cooled power supply for a 2 kW magnetron. It is able to power and control most types of magnetrons on the market with nominal power of 2 kW @ 2.45 GHz.

Depending on the model, output power can be adjusted continuously, from 10% up to 100%, using an external analog signal from 1 to 10VDC, or by remote control through Fieldbus interface or front panel commands.

The SM 845 Microwave Power Supply is a resonant switch-mode power supply with a power factor correction stage (PFC) that improves the efficiency of the entire system. It accepts input line voltage ranging from 180 VAC to 250 VAC. The SM 845 is designed to be used with the Alter TMx20 or TI020 microwave heads, however it may be used to power microwave head developed by other manufacturers (if electrically compatible).

The SM 845 autonomously manages magnetron status, driving the correct pre-heating of the filament, adjusting filament voltage according to the specific back down curve, and shutting off the output in any alarm event condition, such as over-current or over-voltage of the magnetron.

The electrical wiring utilizes industrial connectors, including the high voltage output, carrying the anodic current, that has a specific connector. Any electrical function has a separate connector leading to a simple and easy set up.

The SM 845 has a front panel 19" wide and 2U in height, is built with a rugged steel base and an easily removable aluminum cover. The air cooling flow enters from the sides and exits from the rear.

Features & Benefits:

  • Proven, state-of-the-art design with resonant topology that improves efficiency
  • Single phase input requirement, at nominal 230 VAC, includes Power Factor Correction (PFC) stage widens the input voltage range and allows the unit to power in most countries
  • Low output ripple, suitable for most applications, and stable filament control result in long magnetron life
  • Very low harmonics and inrush current from efficient power stage design
  • "Plug & Play" - when installed with Alter® cable set the user supplies only 2 signals
  • Versions available for many applications


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Need help?

Contact an Applications Specialist by sending an email to MKS Instruments or call 978-284-4000.