Caen N1471 Series Technical document

Technical
Information
Manual
MOD. N1471
24 March 2010
Revision n. 1
4 CH. PROGRAMMABLE
HV POWER SUPPLY
MANUAL REV.1
NPO:
00112/07:N1471.MUTx/01

CAEN will repair or replace any product within the guarantee period if the Guarantor declares
that the product is defective due to workmanship or materials and has not been caused by
mishandling, negligence on behalf of the User, accident or any abnormal conditions or
operations.
CAEN declines all responsibility for damages or
injuries caused by an improper use of the Modules due
to negligence on behalf of the User. It is strongly
recommended to read thoroughly the CAEN User's
Manual before any kind of operation.
CAEN reserves the right to change partially or entirely the contents of this Manual at any time
and without giving any notice.
Disposal of the Product
The product must never be dumped in the Municipal Waste. Please check your local
regulations for disposal of electronics products.

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TABLE OF CONTENTS
1. GENERAL DESCRIPTION.........................................................................................................................7
1.1. OVERVIEW ...............................................................................................................................................7
2. TECHNICAL SPECIFICATIONS..............................................................................................................8
2.1. PACKAGING..............................................................................................................................................8
2.2. POWER REQUIREMENTS ............................................................................................................................8
2.3. FRONT AND BACK PANEL..........................................................................................................................9
2.4. FRONT PANEL CONNECTIONS..................................................................................................................11
2.4.1. Local control section.....................................................................................................................11
2.4.2. Channel control section.................................................................................................................11
2.4.3. HV Status control section ..............................................................................................................12
2.4.3.1. Alarm signal..............................................................................................................................................12
2.4.3.2. Interlock signal..........................................................................................................................................12
2.4.4. Remote communication control section.........................................................................................13
2.5. REAR PANEL CONNECTIONS....................................................................................................................14
2.5.1. HV Channel Output.......................................................................................................................14
2.6. TECHNICAL SPECIFICATIONS TABLE .......................................................................................................15
3. OPERATING MODES...............................................................................................................................16
3.1. PROGRAMMABLE PARAMETERS..............................................................................................................16
3.1.1. Boards parameters ........................................................................................................................16
3.1.2. Channel settings ............................................................................................................................17
3.2. LOCAL CONTROL ...................................................................................................................................17
3.2.1. HV connection ...............................................................................................................................18
3.2.2. Module settings..............................................................................................................................19
3.2.3. Channel settings ............................................................................................................................20
3.2.3.1. Group Settings...........................................................................................................................................23
3.2.3.2. Smileys......................................................................................................................................................26
3.3. CURRENT MONITOR OFFSET CALIBRATION .............................................................................................26
3.4. REMOTE CONTROL.................................................................................................................................27
3.4.1. Serial Links....................................................................................................................................27
3.4.1.1. USB communication .................................................................................................................................27
3.4.1.2. RS232 communication..............................................................................................................................28
3.4.1.3. RS485 communication..............................................................................................................................28
3.4.1.4. Ethernet communication............................................................................................................................29
3.4.2. Communication Control................................................................................................................30
3.4.2.1. Remote Control: Main Menu.....................................................................................................................30
3.4.2.2. Remote Control: General Menu ................................................................................................................30
3.4.2.3. Remote Control: Channels Menu..............................................................................................................30

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3.4.2.4. Remote Control: firmware upgrade...........................................................................................................32
3.4.2.5. Remote Control: format EEPROM............................................................................................................32
3.5. USB -RS485 COMMUNICATION PROTOCOL ..........................................................................................33
3.5.1. Command Format..........................................................................................................................33
3.5.2. Format of response string..............................................................................................................33
3.5.3. MONITOR commands related to the Channels.............................................................................33
3.5.3.1. Meaning of STATUS bits (value read in decimal Format)........................................................................34
3.5.4. MONITOR commands related to the module.................................................................................35
3.5.4.1. Meaning of Board Alarm bits....................................................................................................................36
3.5.5. SET commands related to the Channels........................................................................................36
3.5.6. SET commands related to the module............................................................................................36
4. INTERNAL SETTINGS.............................................................................................................................37
4.1. POLARITY SELECTION.............................................................................................................................37
4.2. INTERNAL SWITCHES ..............................................................................................................................38
4.2.1. Local Bus termination ...................................................................................................................38
4.2.2. RS485 – RS232 conversion............................................................................................................38
LIST OF FIGURES
FIG.1.1: MOD.N1471 4CHANNEL PROGRAMMABLE HV POWER SUPPLY...............................................................7
FIG.2.1: MOD.N1471 SERIES FRONT PANEL ............................................................................................................9
FIG.2.2: MOD.N1471 SERIES BACK PANEL............................................................................................................10
FIG.2.3: LOCAL CONTROL PANEL...........................................................................................................................11
FIG.2.4: CHANNEL CONTROL PANEL AND KILL SCHEME.........................................................................................11
FIG.2.5: N1471 HV STATUS CONTROL PANEL .......................................................................................................12
FIG.2.6: N1471 ALARM ELECTRICAL SCHEME.....................................................................................................12
FIG.2.7: N1471 INTERLOCK ELECTRICAL SCHEME.............................................................................................12
FIG.2.8: REMOTE COMMUNICATION CONTROL AND RS485 I/O –RS232 IN ELECTRICAL SCHEME ........................13
FIG.2.9: HV CHANNEL PANEL AND TEST POINT ELECTRICAL SCHEME ...................................................................14
FIG.3.1: WELCOME SCREEN...................................................................................................................................17
FIG.3.2: CHANNEL OFF STATUS SCREEN ...............................................................................................................18
FIG.3.3: CHANNEL ON STATUS SCREEN.................................................................................................................18
FIG.3.4: CHANNEL KILL STATUS SCREEN .............................................................................................................18
FIG.3.5: MODE SETTINGS STATUS SCREEN.............................................................................................................19
FIG.3.6: MODE SETTINGS ACCESS SCREEN.............................................................................................................19
FIG.3.7: MODE SETTINGS EDIT SCREEN..................................................................................................................19
FIG.3.8: CHANNEL SETTINGS EDIT SCREEN ............................................................................................................20
FIG.3.9: CHANNEL VSET SELECT SCREEN.............................................................................................................20
FIG.3.10: CHANNEL VSET ACCESS SCREEN ..........................................................................................................20

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FIG.3.11: CHANNEL VSET DIGIT SELECTION SCREEN............................................................................................21
FIG.3.12: CHANNEL VSET DIGIT ACCESS SCREEN.................................................................................................21
FIG.3.13: CHANNEL VSET DIGIT ADJUST SCREEN .................................................................................................21
FIG.3.14: CHANNEL VSET DIGIT CONFIRM SCREEN...............................................................................................21
FIG.3.15: CHANNEL VSET CONFIRM SCREEN........................................................................................................22
FIG.3.16: CHANNEL VSET DE-SELECT SCREEN .....................................................................................................22
FIG.3.17: CHANNEL KILL SCREEN ........................................................................................................................22
FIG.3.18: CHANNEL EXIT SCREEN ........................................................................................................................23
FIG.3.19: GROUP SELECTION .................................................................................................................................23
FIG.3.20: GROUP ACTIVE.......................................................................................................................................23
FIG.3.21: GROUP VSET ACCESS SCREEN...............................................................................................................24
FIG.3.22: GROUP VSET DIGIT SELECTION SCREEN ................................................................................................24
FIG.3.23: GROUP CHANNEL VSET DIGIT ACCESS SCREEN.....................................................................................24
FIG.3.24: GROUP VSET DIGIT ADJUST SCREEN......................................................................................................24
FIG.3.25: GROUP VSET DIGIT CONFIRM SCREEN...................................................................................................25
FIG.3.26: CHANNEL VSET DE-SELECT SCREEN .....................................................................................................25
FIG.3.27: GROUP EXIT SCREEN ............................................................................................................................25
FIG.3.28: USB COMMUNICATION DIAGRAM ..........................................................................................................27
FIG.3.29: RS232 COMMUNICATION DIAGRAM .......................................................................................................28
FIG.3.30: RS485 COMMUNICATION DIAGRAM .......................................................................................................28
FIG.3.31: ETHERNET COMMUNICATION DIAGRAM .................................................................................................29
FIG.3.32: RS232 PORT CABLE ADAPTER ................................................................................................................29
FIG.3.33: MAIN MENU...........................................................................................................................................30
FIG.3.34: BOARD STATUS MENU...........................................................................................................................30
FIG.3.35: CHANNELS MENU ..................................................................................................................................31
FIG.3.36: PC KEYBOARD .......................................................................................................................................31
FIG.3.37: CHANNELS GROUP SETTING....................................................................................................................31
FIG.3.38: FIRMWARE UPGRADE MENU/1...............................................................................................................32
FIG.3.39: FIRMWARE UPGRADE MENU/2...............................................................................................................32
FIG.3.40: FORMAT EEPROM MENU .....................................................................................................................32
FIG.4.1: POLARITY SELECTION INSTRUCTIONS.......................................................................................................37
FIG.4.2: DIP SWITCH POSITION...............................................................................................................................38
LIST OF TABLES
TABLE 1.1: AVAILABLE ITEMS .................................................................................................................................7

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TABLE 2.1: POWER REQUIREMENTS..........................................................................................................................8
TABLE 2.2: INTERLOCK OPERATION .......................................................................................................................13
TABLE 2.3: MOD.N1471 CHANNEL TECHNICAL SPECIFICATIONS ..........................................................................15
TABLE 3.1: SMILEYS LIST.......................................................................................................................................26

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1.General description
1.1. Overview
Fig. 1.1: Mod. N1471 4 Channel Programmable HV Power Supply
The Mod. N1471 provides 4 independent High Voltage channels in a single width NIM
mechanics. Two and one channel versions (N1471A and N1471B) are also available.
Each channel can provide a ±5.5kV / 300 µA max output.
Channels have common floating return (common return insulated from the crate ground);
HV outputs are delivered through SHV connectors.
The HV output 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.
Safety features include:
• OVERVOLTAGE and UNDERVOLTAGE warning when the output voltage differs from
the programmed value by more than 2% of set value (minimum 10V).
• Programmable VMAX protection limit
• OVERCURRENT detection: if a channel tries to draw a current larger than its
programmed limit, it enters TRIP status, keeping the maximum allowed value for a
programmable time (TRIP), before being switched off
• Channels can be enabled or disabled individually through the Interlock logic.
Module control can take place either locally, assisted by a Graphic color display or
remotely, via USB, RS232 or RS485, the latter allowing to build a N1471s’ daisy chain
network.
It is also controllable via TCP/IP by the Smart Fan Unit of CAEN NIM 8301 crate.
Control software is available (Mod SW1470), able to manage up to 32 modules (up to
128 channels).
Table 1.1: Available items
Code Model Description
WN1471X05AAC N1471 4 Channel NIM Programmable HV Power Supply (± 5.5 kV, 300 µA, 5 nA res.)
WN1471A05AAC N1471A 2 Channel NIM Programmable HV Power Supply (± 5.5 kV, 300 µA, 5 nA res.)
WN1471B05AAC N1471B 1 Channel NIM Programmable HV Power Supply (± 5.5 kV, 300 µA, 5 nA res.)
WSW1470XAAAA SW1470 N147X Control Software

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2. Technical specifications
2.1. Packaging
The Model N1471 is housed in a single width NIM module.
2.2. Power requirements
Table 2.1: Power requirements
Voltage Current
+12 V 850 mA
-12 V 850 mA

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2.3. Front and back panel
Fig. 2.1: Mod. N1471 series front panel

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Fig. 2.2: Mod. N1471 series back panel

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2.4. Front panel connections
2.4.1. Local control section
Fig. 2.3: Local control panel
NAME: TYPE: FUNCTION:
MONITOR 1” OLED DISPLAY (96x64) Local settings monitoring
TUNE ROTARY SWITCH Parameter and Mode setting
2.4.2. Channel control section
Fig. 2.4: Channel control panel and Kill scheme
NAME: TYPE: FUNCTION:
HV_EN/OFF/KILL 3 POS. SWITCH Channel Enable and turning OFF/KILL1
ON RED LED
HV On enabled
REMOTE KILL AMP 280370-2 The channel is KILLED as no current flows across the
1Kohm resistor; this is achieved either as the 1-2 contacts
are open or as a +4÷6Vdc voltage is fed to pin 1 (see note)
+ GREEN LED
Positive polarity
- YELLOW LED
Negative polarity
1OFF: Channel turned off according to RAMP DOWN setting; KILL: Channel turned off at fastest available rate

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2.4.3. HV Status control section
Fig. 2.5: N1471 HV Status control panel
NAME: TYPE: SIGNAL: FUNCTION:
ON RED LED HV On enabled (at least one channel ON)
ALARM RED LED/LEMO CONN. Out Alarm status signaled (active LOW)
INTERLOCK RED LED/LEMO CONN. In Interlock signal
2.4.3.1. Alarm signal
Fig. 2.6: N1471 ALARM electrical scheme
Alarm signal output signal electrical scheme is reported in the figure above. The
maximum output is 400mA@12V on ± Pins.
2.4.3.2. Interlock signal
Fig. 2.7: N1471 INTERLOCK electrical scheme
A schematic diagram of the Interlock input is shown in the figure above, where the diode
is part of optocoupler stage.
Interlock means that channels are hardware disabled. The interlock operation is
explained by the following table:

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Table 2.2: Interlock operation
CONFIGURATION ↓INTERLOCK MODE (§ 3.1.1) →OPEN CLOSE
leave contact open INTERLOCK ENABLED
voltage level (0÷1V, ~5mA current) between pin 2 and pin 3 INTERLOCK ENABLED
short circuit pin 1 with pin 2, and pin 3 with pin 4 ENABLED INTERLOCK
voltage level (4÷6V, ~5mA current) between pin 2 and pin 3 ENABLED INTERLOCK
The front panel Interlock LED is ON when the INTERLOCK is enabled; as INTERLOCK
is enabled, channels are turned off at the fastest available rate, regardless the RAMP
DOWN setting.
2.4.4. Remote communication control section
Fig. 2.8: Remote communication control and RS485 I/O – RS232 IN electrical scheme
NAME: TYPE: FUNCTION:
IN AMP 280371-2
RS485 Input2; adaptable to RS232 standard (see also § 4.2.2)
OUT AMP 280371-2
RS485 Output
USB B TYPE USB
USB2.0 compliant realized via USB ↔RS232 FT232BM converter
2RS 485 Serial Port Interface allows to control up to 32 modules connected by a twisted pair cable; the first and
last modules must be terminated, see § 4.2.

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2.5. Rear panel connections
2.5.1. HV Channel Output
Fig. 2.9: HV Channel panel and test point electrical scheme
NAME: TYPE: FUNCTION:
MON AMP 280371-2 Vout/Iout Test point
OUT SHV HV Channel Output
The test points allow to monitor the Channel Output Voltage and Current according to the
following conversion:
VMON: Voltage level (1V = 1.5 kV ±1% readout; same polarity as channel)
IMON: Voltage level (1V = 66 µA ±3% readout; positive, 0÷5 V range)

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2.6. Technical specifications table
Table 2.3: Mod. N1471 Channel technical specifications
Output channels: Positive or Negative Polarity (requires internal setting, see § 4.1)
Output ranges: 5.5kV / 300µA
Vset / Vmon Resolution: 100 mV
Iset / Imon Resolution: 5 nA3
Vmax: 0 ÷ 5600 V Absolute maximum HV level that the channel is allowed to reach, independently from the preset
value Vset. Output voltage cannot exceed the preset value Vmax. The accuracy is 1 % ± 5 V
Vmax resolution: ± 1 V
Alarm output: Open collector, 100 mA maximum sink current
Interlock input: LOW: <1V; current~5mA; HIGH: 4÷6 V
Ramp Up/Down: 1÷500 Volt/s, 1 Volt/s step
Trip: Max. time an "overcurrent" is allowed to last (seconds). A channel in "overcurrent" works as a
current generator; output voltage varies in order to keep the output current lower than the
programmed value. "Overcurrent" lasting more than set value (1 to 9999) causes the channel
to "trip". Output voltage will drop to zero either at the Ramp-down rate or at the fastest
available rate, depending on Power Down setting; in both cases the channel is put in the OFF
state. If trip= INFINITE, "overcurrent" lasts indefinitely.
band width typical maximum
10Hz÷100Hz <15mVpp <20mVpp
Voltage Ripple:4
100Hz÷100MHz <5mVpp <15mVpp
Vmon vs. Vout Accuracy: 5±0.02% of read value ±2V
Vset vs. Vmon Accuracy: 4±0.02% of read value ±2V
Imon vs. Iout Accuracy: 4±2% of read value ±20nA
Iset vs. Imon Accuracy: 4±2% of read value ±30nA
Humidity range: 0 ÷ 80%
Operating temperature: 0 ÷ 45°C
Storage temperature: -10 ÷ 70°C
Vout / Temperature coefficient: max. 50ppm / °C
Vout /voltage coefficient: max 2ppm/V
Imon / Temperature coefficient: max 100ppm/C°
Long term stability Vout vs. Vset: ± 0.02% (after one week @ constant temperature)
3The module is calibrated by introducing a positive offset on the current monitor, see details in § 3.3
4Measured with: 1m cable length; 2nF capacitance
5From 10% to 90% of Full Scale Range

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3.Operating modes
Module control can take place either locally, or remotely, via USB or RS485 (see § 3.3).
3.1. Programmable parameters
3.1.1. Boards parameters
General board parameters (CONTROL can be operated both in LOCAL and REMOTE mode;
other monitor and settings are allowed in LOCAL mode only; see § 3.2.2) include:
Parameter: Function: Display:
Power
(Monitor) Module power supply status
Termination
(Monitor) Local Bus termination status (ON/OFF)
HV Clock
(Monitor) Sync clock frequency (200±10 kHz correct value)
Local Bus
Baud Rate
(Monitor/Set)
9600, 19200. 38400, 57600, 115200 Baud
Local Bus
Address
(Monitor/Set)
Local Bus address for remote communication (0÷31)
USB Baud
Rate
(Monitor/Set)
9600, 19200, 38400, 57600, 115200 Baud
INTERLOCK
(Monitor/Set) CLOSED / OPEN OPERATION (see § 2.4.3.2)
CONTROL
(Monitor/Set)
REMOTE: the module is controlled remotely; local monitor is allowed;
LOCAL/REMOTE switch is enabled
LOCAL: the module is controlled locally; remote monitor is allowed

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3.1.2. Channel settings
For each channel the following parameters can be programmed and monitored either
locally or remotely (see § 3.2.3):
Parameter: Function: Unit: Display:
Vmon High Voltage Monitored value Volt
Imon Current Monitored value µA
Vset High Voltage programmed value Volt
Iset Current Limit programmed value µA
MaxV Absolute maximum High Voltage level that the
channel is allowed to reach (see § 2.6) V
Ramp-Up Maximum High Voltage increase rate V/s
Ramp-Down Maximum High Voltage decrease rate V/s
Power Down Power Down mode after channel TRIP KILL or RAMP
Trip Maximum time an "overcurrent" is allowed to
last expressed in seconds (see § 2.6) s
3.2. Local Control
Insert the unit inside a powered NIM crate, and switch it ON. At the power the Display
shows for a few seconds the following screen.
Fig. 3.1: Welcome screen
At this point the module is ready to be operated locally. The TUNE ROTARY SWITCH
(see § 2.4.1) is lit up as long as Local Control is enabled.

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3.2.1. HV connection
Verify the channels polarity (polarity setting is explained in § 3.5) checking that the
polarity LEDs are switched on according to the programmed configuration (see § 2.4.2);
verify the HV_EN/OFF/KILL 3 POS. SWITCH of each channel is set to OFF; the Display
will show the following message in the left lower row:
Fig. 3.2: Channel OFF status screen
now connect the HV cable linking the outputs to the loads to be supplied and enable the
HV outputs switching the HV_EN/OFF/KILL 3 POS. SWITCH in the HV_EN position; the
Display will show the following message in the left lower row:
Fig. 3.3: Channel ON status screen
The KILL position of the HV_EN/OFF/KILL 3 POS. SWITCH allows to turn off the module
at the fastest available rate; the Display will show the following message in the left lower
row:
Fig. 3.4: Channel KILL status screen

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3.2.2. Module settings
Module settings are general board settings; turn the TUNE ROTARY SWITCH until this
screen is shown:
Fig. 3.5: Mode settings status screen
Push the TUNE ROTARY SWITCH in order to access MODULE parameters; the
MODULE frame becomes red:
Fig. 3.6: Mode settings access screen
The TUNE ROTARY SWITCH allows to select the parameter to be set; turn the ROTARY
SWITCH until such parameter is displayed (for example CONTROL), then select it by
pushing the ROTARY SWITCH (the parameter is shown with a red frame as long as it is
active):
Fig. 3.7: Mode settings edit screen
Select the desired value by turning the TUNE ROTARY SWITCH and confirm it by
pushing the switch itself.

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3.2.3. Channel settings
In order to operate Output Channel settings:
Turn the TUNE ROTARY SWITCH until the channel number to be set is displayed in the
left upper row (for example Channel 0)
Push the TUNE ROTARY SWITCH: at this point the frame of the left upper row (channel
number) becomes red and the channel is selected
Fig. 3.8: Channel settings edit screen
Turn the TUNE ROTARY SWITCH until the parameter to be set (for example VSET) is
displayed in the right lower row
Fig. 3.9: Channel VSET select screen
Push the TUNE ROTARY SWITCH: at this point the parameter is selected, its frame is
shown in red and its name in blue; it is now possible to change the parameters value
Fig. 3.10: Channel VSET access screen
Turn the TUNE ROTARY SWITCH until the value digit to be edited is shown in blue, the
parameter name in yellow