• SEM series
  • SEM series

SEM series

Specialized HV power supply for Scanning Electron Microscope

  • Max output voltage for accelerating: -15kV or -30kV
  • Max output voltage for biasing: +3.5kV
  • Max output power for filament: 15W
  • High reliability design and appropriate protection circuits

The exclusive design for bringing out the performance of an electron gun to the maximum!

SEM series is a high voltage power supply for electron gun of Scanning Electron Microscope (SEM), and a floating power supply with accelerator, biasing and filament supply integrated.

Features and Benefits

  • Three outputs for electron beam of SEM are integrated in one case
  • High stability, low ripple noise
  • Over current protection
  • Short circuit protection


Output Accelerating power supply
Model Output Voltage Output Current/power Output setting accuracy Stability
(after warm-up of 1Hr)
Ripple Control Voltage Output Current
SEM-15 0 to -15 kV 300 µA * ±3% ±5 ppm/3 min 10 ppm p-p of F.S. 0 to 10 V (CV) 3 V/300 µA *1
SEM-30 0 to -30 kV
  • * Including feedback current.


For details, download the datasheet below.


-LB6: Changing the bias voltage to "0 to +6 kV"

-LS03: Adding the power supply for suppressor

(When this option is chosen, the dimensions of SEM-15 and SEM-30 will be W11.02 x D9.84 x H4.92 inches.)

-LFcv: Constant voltage filament output

-LFcc: Constant current filament output

Specifications will be as follws. -LFcv and -LFcc cannot be chosen together.

Model Control of filament output Filament output Control Volt. Caution
Standard CP (Constant Power) 0 to 15 W (Load1 Ω) 0 to 10 Vdc Max. output volt.: 5 V
-LFcv optional CV (Constant Voltage) 0 to 5 V (Load1 Ω) 0 to 10 Vdc Max. output power: 15 W
-LFcc optional CC (Constant Current) 0 to 5 A (Load1 Ω) 0 to 10 Vdc Max. output power: 15 W


Output Cable *: Output cable with plug (flying lead) 1.5m

Model: CN-SEM4P

* The model number of output cable and output connector will change when -LB6 or -LS03 option is chosen. Please contact our sales office for detalis.


For details, download the datasheet below.


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High Voltage power supplies (Chassis Mount/PCB Mount)