Power supplies & heating controllers

Research Unit Digital Instrument RUDI-8M

Research Unit Digital Instrument RUDI-8M

Technical data

Power supply 100-240 V 50/60 Hz, max. 150 VA, depends on modules number
Maximum number of modules in 3U rack 8 (8HP wide) or 4 (12HP)+ 2 (8HP), 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 448.8 x 132.5 x 437 mm (W x H x D), rack 3U height, 84Hp width
Weight (approx.) 6 kg

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

Modular, compact high voltage power supply for photoemission and other demanding research applications.

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-analog converters with high linearity and very high temperature stability. Automatic low and high voltage range settings, as well as output polarity, are under full user control.

The combined high specifiation and system flexibility makes RUDI-8M the obvious choice for many analysis applications, where stable, high voltage supplies are required and can also be readily configured by the end user.

Device 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).

▪ 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 < 100 mV.
▪ 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).

▪ Any other voltages up to 6 kV available on request
▪ High linearity controlled with an accuracy of 16 bits
▪ Up to 8 modules fit into 3U rack
▪ Voltage deviation calculated with ten-point calibration at min and max voltage


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