Research Unit Digital Instrument RUDI-EA2

Novel, modular high voltage power supply for photoemission and other demanding research applications.



Prevac are a world leader in the design and production of analytical and deposit scientific and research equipment. Their systems operate in a high and ultra high vacuum environment. They design and construct UHV and HV systems fully adapted to the individual requirements of research projects and industrial applications.

Key Features

  • Special techniques have been used to achieve rapid temperature stabilization. The system is ready for use after only 3 minutes from switch on
  • Each independent voltage module achieves temperature stability below 0.5 ppm of the voltage span per degree Celcius
  • Using 16bit AD converters, the 6 kV power supplies can be set with a resolution of just 92 mV and with a maximum noise level of only 200 µVp-p
  • Each modules can be controlled independently via MODBUS-TCP 460 Kbit/s wire interface
  • Each module has a floating output which means a wide range of configurations are possible making the unit truly universal – serial configuration is unlimited
  • Any other voltages up to 6000 V available on request
  • High linearity controlled with an accuracy of 16 bits
  • Up to 28 modules fit into 9U rack
  • Voltage deviation calculated with two-point calibration at min and max voltage


The electronics features fully calibrated, independently operating modules utilising the very latest electronics and software technology. Voltage supplies are controlled by high precision 16-bit digital-to-analogue converters with high linearity and extremely high temperature stability. Automatic low and high voltage range settings, as well as output polarity, are under full user control.

The combined high specification and system flexibility makes RUDI-EA2 the obvious choice for many analysis applications, where stable, high voltage supplies are required and can also be readily configured by the end user.

Each RUDI-EA2 unit is supplied with a comprehensive serial communication protocol description which can be easily implemented for individual control needs, thus removing the reliance on specific, often prohibitive supplier software.

As the demand for smarter, connected technologies increases, PREVAC provides the best in class electronic solutions. The electronic mainboard of the RUDI-EA2 system is a showcase for the best in active digital and analogue electronic components currently on the market.

Technical data

Supply voltage 110-260 V 50/60 Hz, max. 200 VA, depends on modules number
Maximum number of modules in 9U rack 28 of all modules chosen from DAC and HV
High voltage modules Different version up to 6 kV, bipolar, floating output
DAC modules High precision 16 bit +/-12.5 V
Insulation All HV and DAC modules have full insulation 6 kV to power and ground
Temperature stability < 0.5 ppm/°C for all modules
External interlock Active when the contact is closed
Communication interface MODBUS-TCP 460 Kbit/s
Rack dimensions 483 x 395 x 360 mm (W x H x D), rack 9U height, 84Hp width
Weight (approx.) 18 kg (for ~20 modules)
High voltage modules
Modules Output voltage Maximum output current
HV 100V ~0 – 100 V, 16 bit, step size ~1.6 mV ~600 µA
HV 600V ~0 – 600 V, 16 bit, step size ~9.2 mV ~300 µA
HV 600/100V Low range ~0 – 100 V, 16 bit, step size ~1.6 mV
High range ~0 – 600 V, 16 bit, step size ~9.2 mV
~300 µA
HV 1900/100V Low range ~0 – 100 V, 16 bit, step size ~1.6 mV
High range ~0 – 1900 V, 16 bit, step size ~23 mV
~200 µA
HV 2200V ~0 – 2200 V, 16 bit, step size ~34 mV ~150 µA
HV 4000V ~0 – 4000 V, 16 bit, step size ~61 mV ~100 µA
HV 6000/600V Low range ~0 – 600 V, 16 bit, step size ~9.2 mV
High range ~0 – 6000 V, 16 bit, step size ~92 mV
~100 µA
DAC modules
Output voltage 0… +/- 12.5 V
Precision 16 bit
Step size 200 µV
Protection Surge protection 23 kV



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Service Support

Comprehensive repairs and servicing

Annual Support Programs

Your metrology instrumentation is a major investment that is critical to your business operation and success. In today’s competitive climate, it is more important than ever to extend the functionality and peak performance of your metrology equipment years beyond the expiration of your factory warranty. CN Tech’s Support Programs will help ensure that your investment is protected, and that you and your instrument’s are always operating at peak performance.

With over 20 years’ experience servicing and repairing you can be assured that your system is in safe hands. The independent services we offer include system relocation, maintenance visits, parts and consumables, and break down interventions.

CN Tech’s Support Programs are an economical way to guarantee optimal working condition:

  • Annual Preventive Maintenance
  • Priority Technical Assistance
  • Preferred Parts Availability
  • On-Site User Training
  • Remote Diagnostics
  • No surprise repair expense and much more!

Support Contact Example

An example of our service and support contracts are shown below:


Metrology & Instrumentation Annual Support Programs 2022/23

CN Tech's Support Programs will help ensure that your investment is protected, and that you and your instrument’s are always operating at peak performance.

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