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Title :
Re vision date:
Re vision:
User's Manual (MUT)
Mod. A1735-A1835-A1735B-A1835B HV Boards
24/03/2014
8
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00101/00:17XXx.MUTx/08
A1735B-A1835B_REV8.DOCX
14
5
1. Mod. A 1735 - A 1835 HV Boards
1.1
Functional description
The Mod. A 1735 – A 1835 are single width boards housing 12 HV channels with either
positive (A 1735P – A 1835P) or negative (A 1735N – A 1835N) polarity.
28 channel double width versions (Mod. A 1735B – A 1835B) have either positive
(A 1735BP – A 1835BP) or negative polarity (A 1735BN – A 1835BN)
.
The boards are compatible with the CAEN Universal Multichannel Power Supply System
(SYx527)
The Mod. A 1735 - A 1735B output channels have 1.5 kV / 7 mA full scale range (dip-
switch selectable); the Mod. A 1835 - A 1835B output channels offer either 1.5 kV / 7 mA
or 1.5 kV / 200 µA full scale range (dip-switch selectable).
If the output voltage differs from the programmed value by more than 3% of voltage full
scale range, the channel is signalled to be either in OVERVOLTAGE or
UNDERVOLTAGE condition. Moreover, for each channel, a voltage protection limit
SVMAX can be fixed via software with 1 V resolution and the output voltage can not be
programmed beyond this value. The HV RAMP-UP and RAMP-DOWN rates may be
selected independently for each channel in the range 1
÷
500 V/s in 1 V/s steps. The
output current is monitored with 20 nA / 500 nA resolution depending on current range; if
a channel tries to draw a current larger than its programmed limit it is signalled to be in
OVERCURRENT condition; the SY 1527 system detects this state as a fault and reacts
according to the setting of the TRIP parameter
, namely:
TRIP=infinite ( = 1000 s)
When the set output current value is reached the channel behaves like a constant
current generator.
2) TRIP=finite (< 1000 s)
The output current keeps the set value only for programmed time interval and then is
switched off.
The TRIP time (i.e. the maximum time an OVERCURRENT condition is allowed to last)
can be programmed in 0.1 s steps.
The maximum output voltage (VMAX Hardware) 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 boards host also a temperature sensor located on the PCB near the HV channels:
the temperature values measured by this sensor are used to signal Over Temperature
condition on the SYX527.
The boards are provided with an "HV EN" input that disables the channels when it is not
connected to ground.
1
A 1735B – A 1835B are currently out of stock and no longer produced
2
Refer to the SYx527 User’s Manuals for details about the TRIP Handling.
