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CAEN
Electronic Instrumentation
1.
Overview
Functional description
The Mod. A1539, AG539, A154X, AG54X is a family of HV boards, available with either positive or
negative polarity, compatible with the CAEN Universal Multichannel Power Supply System (SYx527).
The A1539, A154x channels share a common floating return, which allows on-detector grounding
reducing the noise level; the floating return is insulated from the crate earth up to ±50 V (with a 65 V
hardware limit); the return of the AG539, AG54x channels is wired to the crate Earth reference.
12, 24 and 32 channel versions are available; 12 channel versions output voltages are provided via SHV
connectors; 24 channel versions are available with either SHV connectors or DB25 connector; 32
channel boards have the DB25 connectors. 24 channel SHV versions are double width boards (10 TE); all
other versions are single width (5 TE).
All boards are provided with both current and voltage protections. If over-current occurs, the relevant
channel can be programmed either to turn off after a programmable trip time or to keep on providing
the maximum allowed current: this particular feature allows the modules to work as current generator
(TRIP range: 0 ÷ 999 s; 1000 s = Infinite, current generator mode. Step = 1 s). The maximum output
voltage can be fixed, through a potentiometer located on the front panel, at the same common value for
all the board channels and this value can be read out via software.
The HV RAMP-UP and RAMP-DOWN rates may be selected independently for each channel.
Some models offer dual current range, selectable via software, with increased monitor resolution for
the lower range.
The boards have also the safety board interlock: this protection allows to disable the primary HV
generation when the HV outputs are not connected to their loads.
A1539, AG539, A154X, AG54X Power Supply Boards
4
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