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8 Channel Low Voltage Power Supply Family

  • 8 independently controllable Low Voltage channels
  • 3 models available: 5 V, 8 V and 15 V
  • 8 pin D-Sub or DB37 (A2518/19 versions) connectors
  • 50 W Max channel output power
  • Channels can be paralleled for increased output power (2 and 4 modularity)
  • Full Digital PID Control Loop
  • Individual Floating channels
  • Individual remote sense lines
  • 1 mV voltage monitor resolution
  • 1 mA current monitor resolution
  • Voltage ripple smaller than 10 mVpp
child1 A251x
The A251x is a new CAEN Family of LV Power Supply boards providing 8 independent Low Voltage Individual Floating channels, allowing on-detector grounding, thus reducing the noise level. The channels are insulated from each other up to 500 V and can be connected in parallel with modularity 2 or 4, in order to obtain higher output power. The maximum channel power is 50 W (200 W with 4 paralleled channels).

Channels feature a PID (Proportional-Integrative-Derivative) digital controller, that allows to optimize the control loop to any load.

Moreover, the voltage drop over the cables can be compensated thanks to remote sensing lines.

Voltage Set/Monitor resolution is 1 mV, Current Set resolution is 10 mA and Current Monitor resolution is 1 mA (with 2 and 4 paralleled channels, Iset resolution is 100 nA and Imon resolution is 10 mA).

Three models are available with voltage spanning from 5 V to 15 V and current from 5 A to 15 A.
Model Compare
Maximum Current
N. of
1 5 V
15 A
10/1 mA
8 pin D-Sub
3 8 V
10 A
10/1 mA
8 pin D-Sub
5 15 V
5 A
10/1 mA
8 pin D-Sub
child2 A251x
Safety features
arrow Overvoltage detection: if a channel voltage exceeds the programmed Overvoltage threshold value (OVVThr), it is signaled to be in "overvoltage" and is switched off.
arrow Undervoltage detection: if a channel voltage decreases below the programmed undervoltage threshold (UNVThr) it is signaled to be in "undervoltage" and is switched off.
arrow Overcurrent detection: if a channel tries to draw a current larger than its programmed limit, it is signaled to be in "overcurrent" and is switched off.
arrow A global enable/disable connector allows to disable the channels and it is also possible, via front panel logic signals, to enable individually each channel (A2518A and A2519A versions only).
PID A251x
Full Digital PID Control Loop
Channels feature a PID (proportional integrative-derivative) digital controller, whose parameters (Kp: Proportional gain, Ki: Integral gain, Kd: Derivative gain) are User programmable. In this way, the control loop can be optimized to any load conditions independently for each channel.
Universal Multichannel System - Mainframes
Modularity, Compatibility, Connectivity, Usability and Solidity are the keywords of the system design. The Mainframes have been specifically designed to power all detector technologies found in modern Physics Experiments, such as photomultipliers, wire chambers, streamers tubes, silicon detectors and others.

The systems are modular, flexible and match not only the requirements of major experiments with large number of channels but also the practical needs of test laboratories, where simple manual operations on a limited number of channels are often desired.

For more information see the Mainframes web pages: