Document type:
Title:
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Revision:
User's Manual (MUT)
Mod. A1732-A1832 High Voltage Boards
02/05/2005
5
NPO:
Filename:
Number of pages:
Page:
00101/00:17XXx.MUTx/05 A1732B-A1832B_REV5.DOC
20
6
2. Mod. A 1732 - A 1832 HV Boards
2.1 Functional
description
The Mod. A 1732 – A 1832 are single width boards housing 12 H.V. channels with either
positive (A 1732P – A 1832P) or negative (A 1732N – A 1832N) polarity.
28 channel double width versions (Mod. A 1732B – A 1832B) are available as well, with
either positive (A 1732BP – A 1832BP) or negative polarity (A 1732BN – A 1832BN).
The Mod. A 1732 - A 1732B output channels have 6 kV / 1 mA full scale range (dip-
switch selectable); the Mod. A 1832 - A 1832B output channels offer either 6 kV / 1 mA
or 6 kV / 200 µA full scale range (dip-switch selectable); 12 channel versions with
individually enabled channels (Mod. A1832 E P/N) are available as well (see also
APPENDIX A
).
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 / 100 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
1
, namely:
1) 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 SY 1527.
The boards are provided with an "HV EN" input that disables the channels when it is not
connected to ground.
1
Refer to the SY1527/SY2527/SY3527 User’s Manuals for details about the TRIP Handling.
