Pyramid Technical Consultants I128r5 User manual

I128r5
Ionization Chamber Controller
User Manual
Pyramid Technical Consultants, Inc.
1050 Waltham Street Suite 200, Lexington, MA 02421 USA
US: TEL: [phone]  FAX: [phone]  EMAIL:
[email protected]
Europe: TEL: [phone]

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1 Contents
1 CONTENTS ........................................................................................................................................................ 2
2 FIGURES ............................................................................................................................................................ 6
3 SAFETY INFORMATION ............................................................................................................................... 8
4 MODELS .......................................................................................................................................................... 10
5 SCOPE OF SUPPLY ....................................................................................................................................... 11
6 OPTIONAL ITEMS AND RELATED PRODUCTS .................................................................................... 12
6.1 I
ONIZATION CHAMBERS
.................................................................................................................................. 12
6.2 P
OWER SUPPLIES
............................................................................................................................................ 12
6.3 S
IGNAL CABLES AND CABLE ACCESSORIES
..................................................................................................... 12
6.4 D
ATA CABLES
................................................................................................................................................ 13
6.5 D
IGITAL SIGNALS
........................................................................................................................................... 13
6.6 R
ELAY CONNECTIONS
.................................................................................................................................... 14
7 INTENDED USE AND KEY FEATURES .................................................................................................... 15
7.1 I
NTENDED
U
SE
............................................................................................................................................... 15
7.2 K
EY
F
EATURES
.............................................................................................................................................. 15
7.3 C HANGES IN THE I128 REV 5 ........................................................................................................................... 16
SPECIFICATION ..................................................................................................................................................... 18
8 INSTALLATION ............................................................................................................................................. 25
8.1 M
OUNTING
..................................................................................................................................................... 25
8.2 G
ROUNDING AND POWER SUPPLY
................................................................................................................... 25
8.3 C
ONNECTION TO SIGNAL SOURCE
................................................................................................................... 26
Example setup ...................................................................................................................................... 26
Cables .................................................................................................................................................. 28
Fiber optics .......................................................................................................................................... 29
Signal current path .............................................................................................................................. 29
9 HOW THE I128R5 WORKS AND HOW TO USE IT - AN OVERVIEW ................................................ 31
9.1 M
ULTICHANNEL ELECTROMETER INPUT
(
CHANNELS
1
TO
128) ...................................................................... 31
9.2 I
NTEGRAL PLANE ELECTROMETER INPUT
(
CHANNEL
0 - HCC) ....................................................................... 32
9.3 A
CQUISITION MODES
...................................................................................................................................... 33
9.4 T
RIGGERING
................................................................................................................................................... 34
9.5 S
ELF
-
TESTING AND CALIBRATION
.................................................................................................................. 34
9.6 H
IGH VOLTAGE OUTPUT
................................................................................................................................. 34
9.7 E
NVIRONMENTAL SENSOR INPUT
.................................................................................................................... 35
9.8 G
ENERAL
-
PURPOSE
I/O .................................................................................................................................. 35
9.9 A
CTUATOR CONTROL
..................................................................................................................................... 35
9.10 A
CCELERATOR INTERFACING
.................................................................................................................... 35
9.11 S
AFETY SYSTEM INTERFACING
.................................................................................................................. 36
9.12 F
IBER OPTIC COMMUNICATION INTERFACES
.............................................................................................. 36
9.13 M
ONITOR UNIT OUTPUT
............................................................................................................................. 37
9.14 C
OMMUNICATION TO THE HOST COMPUTER
............................................................................................... 37

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9.15 E
MBEDDED SOFTWARE
.............................................................................................................................. 37
10 GETTING STARTED USING THE PTC DIAGNOSTIC G2 HOST PROGRAM ................................... 38
10.1 I
NSTALLATION
........................................................................................................................................... 38
10.2 C
ONNECTING TO THE
I128
R
5 ..................................................................................................................... 39
10.3 S
CREEN LAYOUT
– T
OP BANNER
................................................................................................................ 43
10.4 S
CREEN LAYOUT
– R
IGHT
-
HAND TABS
...................................................................................................... 44
Data tab .......................................................................................................................................... 44
Data analysis .................................................................................................................................. 46
Device ............................................................................................................................................. 47
Setup ................................................................................................................................................ 51
Calibration ...................................................................................................................................... 54
Real Time Processing ...................................................................................................................... 55
Interlocks......................................................................................................................................... 56
Properties ........................................................................................................................................ 57
10.5 S
CREEN LAYOUT
- G
RAPHIC DISPLAY
........................................................................................................ 58
Strip display .................................................................................................................................... 59
Scope display .................................................................................................................................. 59
Histogram display ........................................................................................................................... 60
Cursor ............................................................................................................................................. 60
Filtering and zero subtraction ........................................................................................................ 60
Data record period.......................................................................................................................... 62
10.6 D
ATA LOGGING
......................................................................................................................................... 63
11 I128R5 CIRCUIT OVERVIEW ..................................................................................................................... 64
11.1 O
VERVIEW
................................................................................................................................................ 64
11.2 F
UNCTIONS
................................................................................................................................................ 65
Signal current inputs ....................................................................................................................... 65
Calibration current switching ......................................................................................................... 65
Analog signals ................................................................................................................................. 65
Digital signals ................................................................................................................................. 65
Compatibility switch ....................................................................................................................... 65
High voltage .................................................................................................................................... 66
Interlocks......................................................................................................................................... 66
A61 .................................................................................................................................................. 66
Secondary FPGA............................................................................................................................. 66
Power supplies ................................................................................................................................ 67
12 HIGH VOLTAGE SUPPLIES ........................................................................................................................ 68
12.1 S
ETTING THE
H
IGH
V
OLTAGE
S
UPPLIES
.................................................................................................... 68
12.2 C
HANGING THE
H
IGH
V
OLTAGE
S
UPPLY
R
ANGE AND
P
OLARITY
.............................................................. 69
13 SAMPLES, LOGGED DATA, INTEGRATION AND AVERAGING ....................................................... 70
13.1 R
EADINGS AND LOGGED DATA
.................................................................................................................. 70
13.2 I
NTEGRATION TIME
.................................................................................................................................... 70
13.3 C
ONVERSIONS PER SAMPLE
....................................................................................................................... 71
13.4 G ENERAL PURPOSE ANALOG INPUTS .......................................................................................................... 72
14 TRIGGERS AND DATA BUFFERING ........................................................................................................ 73
14.1 I
NTERNAL TRIGGER MODE
......................................................................................................................... 73
14.2 D
ATA BUFFERS
.......................................................................................................................................... 73
I128r5 internal buffer...................................................................................................................... 73
PTC DiagnosticG2 buffer ............................................................................................................... 74
14.3 E
XTERNAL TRIGGERING
............................................................................................................................ 74
Custom triggering ........................................................................................................................... 74
Pre-defined trigger modes .............................................................................................................. 77

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Trigger response time ..................................................................................................................... 78
15 Q PULSE OUTPUT ......................................................................................................................................... 79
16 ACTUATOR CONTROL ................................................................................................................................ 80
17 INTERLOCKS AND DIRECT CONTROL LINES ..................................................................................... 81
17.1 P
ROCESS CONTROL OUTPUTS AND INPUTS
................................................................................................. 81
17.2 I
NTERLOCKS
.............................................................................................................................................. 82
Status in/out .................................................................................................................................... 83
18 CONNECTING SLAVE DEVICES ............................................................................................................... 86
19 CALIBRATION ............................................................................................................................................... 87
19.1 C
URRENT CALIBRATION
............................................................................................................................ 87
19.2 O
THER CALIBRATIONS
............................................................................................................................... 87
20 PEAK FITTING ............................................................................................................................................... 88
21 USING THE TRIANGLE GENERATOR TEST BOARD .......................................................................... 89
22 GATE CONNECTIONS .................................................................................................................................. 91
23 I128 REVISION 4 EMULATION .................................................................................................................. 92
24 CONNECTORS ............................................................................................................................................... 93
24.1 F
RONT PANEL CONNECTORS
...................................................................................................................... 93
Monitor output ................................................................................................................................ 93
Environmental sensors .................................................................................................................... 93
General I/O ..................................................................................................................................... 93
Actuator .......................................................................................................................................... 94
HCC: High current input (channel 0) ............................................................................................. 95
Signal inputs (strip inputs) .............................................................................................................. 95
High voltage output and input......................................................................................................... 98
24.2 R
EAR PANEL CONNECTORS
........................................................................................................................ 98
Ethernet communications ................................................................................................................ 98
Fiber-optics ..................................................................................................................................... 98
Status port ....................................................................................................................................... 98
Interlock port .................................................................................................................................. 99
Power input, 24 VDC .................................................................................................................... 100
Ground lug .................................................................................................................................... 100
25 CONTROLS AND INDICATORS ............................................................................................................... 101
25.1 F
RONT PANEL CONTROLS
........................................................................................................................ 101
25.2 R
EAR PANEL CONTROLS
.......................................................................................................................... 101
Reset button ................................................................................................................................... 101
25.3 F
RONT PANEL INDICATORS
...................................................................................................................... 101
Power on ....................................................................................................................................... 101
Safety bypass ................................................................................................................................. 101
HV on ............................................................................................................................................ 101
25.4 R
EAR PANEL INDICATORS
........................................................................................................................ 101
S1 .................................................................................................................................................. 101
S2 .................................................................................................................................................. 101
S3 .................................................................................................................................................. 101
S4 .................................................................................................................................................. 101

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Power up LED sequence ............................................................................................................... 102
RJ-45 indicators ............................................................................................................................ 102
26 COMMUNICATIONS INTERFACES ........................................................................................................ 103
26.1 E
THERNET
............................................................................................................................................... 103
26.2 W
EB SERVER
........................................................................................................................................... 103
26.3 F
IBER OPTICS
........................................................................................................................................... 104
27 USING THE I128R5 ON A NETWORK ..................................................................................................... 105
27.1 N
ETWORK CONFIGURATIONS
................................................................................................................... 105
27.2 R
ECOVERY FROM UNKNOWN
IP
ADDRESS
............................................................................................... 106
27.3 S
YSTEM LOG ADDRESS
............................................................................................................................ 107
28 IG2 AND EPICS INTERFACE .................................................................................................................... 108
28.1 W
HAT IS
EPICS? ..................................................................................................................................... 108
28.2 I
NSTALLING AND
C
ONFIGURING
IG2 ....................................................................................................... 109
29 FAULT-FINDING ......................................................................................................................................... 112
30 MAINTENANCE ........................................................................................................................................... 117
30.1 C
OOLING FAN MAINTENANCE
.................................................................................................................. 117
30.2 C
ALIBRATION
.......................................................................................................................................... 118
31 RETURNS PROCEDURE ............................................................................................................................ 119
32 SUPPORT ....................................................................................................................................................... 120
33 DISPOSAL ...................................................................................................................................................... 121
34 DECLARATION OF CONFORMITY ........................................................................................................ 122
35 REVISION HISTORY................................................................................................................................... 123

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2 Figures
Figure 1. Redel PAG two-pin power connector ...................................................................................................... 12
Figure 2. Fiber optic cables ST bayonet terminated ............................................................................................... 13
Figure 3. X22 Bi-directional fiber optic / TTL converter ....................................................................................... 14
Figure 4. Summary of control signal changes introduced in the revision 5 I128 ................................................ 17
Figure 5. I128 rev5 front and rear panels. Dimensions mm. ............................................................................... 23
Figure 6. I128 rev 5 case plan and side views. Dimensions mm. .......................................................................... 24
Figure 7. Schematic example: I128r5 installation to read out an ionization chamber with strip and integral
plane electrodes ................................................................................................................................................ 27
Figure 8. Connection diagram for an IC128-25LC-2I read out by a pair of I128r5 electrometers ................... 28
Figure 9. Current return path: ionization chamber bias provided by HV module in the I128r5 ...................... 30
Figure 10. Current return path: ionization chamber bias provided separate HV module ................................ 30
Figure 11. ADAS electrometer input (one of 128 identical parallel inputs, ch1 to 128) ..................................... 31
Figure 12. HCC (integral or dose plane, ch0) electrometer input ........................................................................ 33
Figure 13. High voltage loopback arrangement ..................................................................................................... 35
Figure 14. Schematic example: I128r5 control of remote devices ........................................................................ 36
Figure 15. PTC DiagnosticG2 installation .............................................................................................................. 39
Figure 16. Direct Ethernet connection. ................................................................................................................... 40
Figure 17. Configuring the IP address on the host computer. .............................................................................. 40
Figure 18. Ping test of the Ethernet connection. .................................................................................................... 41
Figure 19. Discover devices in progress .................................................................................................................. 42
Figure 20. Ready to connect to the I128r5 .............................................................................................................. 42
Figure 21. Opening the I128r5 window .................................................................................................................. 43
Figure 22. HCC plot displayed, strip chart mode .................................................................................................. 45
Figure 23. Data analysis display – I128r5 and PTC DiagnosticG2 calculations.................................................. 46
Figure 24. IC Device Support ................................................................................................................................... 47
Figure 25. Pixelated device setup screen .................................................................................................................. 48
Figure 26. Measured parameters from pixelated data ........................................................................................... 49
Figure 27. Pixelated Display Options ....................................................................................................................... 50
Figure 28. MLFC setup ............................................................................................................................................. 51
Figure 29. MLFC Energy Display ............................................................................................................................ 51
Figure 30. Setup - Measuring sub-tab ................................................................................................................... 52
Figure 31. Setup - Trigger sub-tab ........................................................................................................................ 53
Figure 32. Setup - HCC sub-tab ............................................................................................................................ 53
Figure 33. Calibration source control ..................................................................................................................... 54
Figure 34. Current input calibrations ..................................................................................................................... 55
Figure 35. Real time processing controls ................................................................................................................ 55
Figure 36. Interlock test functions ........................................................................................................................... 56
Figure 37. Firmware versions .................................................................................................................................. 57
Figure 38. Communication settings ......................................................................................................................... 58
Figure 39. IP Configuration control ........................................................................................................................ 58
Figure 40. Scope mode capture of a pulse............................................................................................................... 59
Figure 41. Strip chart data display showing cursor. .............................................................................................. 60
Figure 42. Increasing the low pass filtering of the displayed data. ....................................................................... 61
Figure 43. Zero correction of displayed data ......................................................................................................... 62
Figure 44. Data record period options .................................................................................................................... 62
Figure 45. I128r5 overview schematic. .................................................................................................................... 64
Figure 46. High voltage jumper settings ................................................................................................................. 69
Figure 47. Data feed into samples............................................................................................................................ 71
Figure 48. Contiguous data number of samples as a function of input data rate ............................................... 74
Figure 49. Signal and trigger used for custom trigger examples .......................................................................... 75
Figure 50. Time-varying signal seen in internal mode .......................................................................................... 76
Figure 51. Time-varying signal seen in custom buffered mode ............................................................................ 76
Figure 52. Using trigger signals and burst size to capture a portion of the signal .............................................. 77

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Figure 53. I128r5 actuator control circuit. ............................................................................................................. 80
Figure 54. Actuator connections for 24 VDC solenoid. ......................................................................................... 80
Figure 55. Interlock relays in series on multiple devices wired for current loop ................................................ 83
Figure 56. Interlock relays in series on multiple devices wired for 24 V logic .................................................... 83
Figure 57. Status opto-coupler input - I128r5 internal circuit. ............................................................................. 84
Figure 58. Safety bypass input - I128r5 internal circuit. ....................................................................................... 84
Figure 59. I128r5 with two M10 general purpose I/O devices connected as slaves on loop 1 ............................ 86
Figure 60. Triangle generator test board ................................................................................................................ 89
Figure 61. Test pattern from triangle generator board using 5V source ............................................................. 90
Figure 62. Time varying signal injected to BNC input of test board.................................................................... 90
Figure 63. Gate passthrough latency: gate in (yellow), gate out (blue) ............................................................... 91
Figure 64. Gate connection to multiple I128r5 units ............................................................................................. 91
Figure 65. Location of revision 4 emulation mode switch .................................................................................... 92
Figure 66. Emulation switch positions .................................................................................................................... 92
Figure 67. Interrogating the I128r5 via a web browser. ...................................................................................... 104
Figure 68. Direct Ethernet connection .................................................................................................................. 105
Figure 69. Connection via switch........................................................................................................................... 106
Figure 70. Network including router .................................................................................................................... 106
Figure 73. Fan filter removal ................................................................................................................................. 117
Figure 74. Fan power connector (2 pin Molex) .................................................................................................... 118

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3 Safety Information
This unit is designed for compliance with harmonized electrical safety standard EN61010-
1:2000. It must be used in accordance with its specifications and operating instructions.
Operators of the unit are expected to be qualified personnel who are aware of electrical safety
issues. The customer’s Responsible Body, as defined in the standard, must ensure that operators
are provided with the appropriate equipment and training.
The unit is designed to make measurements in Measurement Category I as defined in the
standard.
CAUTION. According to installed options, the I128r5 can generate high voltages as follows,
present on the central conductor of the SHV (Safe High Voltage) output connector.:
+ or – 2000 V DC at 0.5 mA maximum.
or
+ or – 1000 V DC at 1.0 mA maximum
or
+ or – 500 V DC at 2.0 mA maximum
The hazardous live voltages on the SHV central conductor are not accessible under the
definitions of EN61010 but may nevertheless give a noticeable shock if misuse were to lead you
to come into contact with them. The user must therefore exercise appropriate caution when
using the device and when connecting cables. Power should be turned off before making any
connections.
The unit must not be operated unless correctly assembled in its case. Protection from high
voltages generated by the device will be impaired if the unit is operated without its case. Only
Service Personnel, as defined in EN61010-1, should attempt to work on the disassembled unit,
and then only under specific instruction from Pyramid Technical Consultants, Inc.
The unit is designed to operate from +24VDC power, with a typical maximum current
requirement of 1000 mA. A suitably rated power supply module is available as an option. Users
who make their own power provision should ensure that the supply cannot source more than
3000 mA.
A safety ground must be securely connected to the ground lug on the case.
Some of the following symbols may be displayed on the unit, and have the indicated meanings.

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Direct current
Earth (ground) terminal
Protective conductor terminal
Frame or chassis terminal
Equipotentiality
Supply ON
Supply OFF
CAUTION – RISK OF ELECTRIC SHOCK
CAUTION – RISK OF DANGER – REFER TO MANUAL

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4 Models
I128r5 Ionization chamber controller with 128 electrometer channels, and
one multi-range I-V converter / gated integrator channel.
-XP20/10/5 Add positive 0 to 2000V / 1000 V / 500 V HV output
-XN20/10/5 Add negative 0 to 2000V / 1000 V / 500 V HV output
Example:
I128r5-XP20 I128r5 with 2000V positive high voltage output.

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5 Scope of Supply
I128r5 model as specified in your order.
PSU24-40-1R 24 VDC power supply with Redel locking connector.
Two CONN-PHCOMBI8_3.5 mating connectors for relay signals
USB memory stick containing:
I128r5 User manual
PTC DiagnosticG2 software installation files for Windows PC
PTC IG2 channel access server software for EPICS, for Windows PC
Test data
Optional items as specified in your order.
OEM customers will receive only components relevant to their application.

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6 Optional Items and related products
6.1 Ionization chambers
IC128-25LC Low-scattering ionization chamber for high-energy positive ion beams with 25 by
25 cm sensitive area, 128 readout strips in each axis and one dual gap integral readout section.
IC128-25LC-2I Low-scattering ionization chamber for high-energy positive ion beams with 25
by 25 cm sensitive area, 128 readout strips in each axis and two dual gap integral readout
sections.
IC64-16-2I Low-scattering ionization chamber for high-energy positive ion beams with 16 by
16 cm sensitive area, 64 readout strips in each axis and two integral readout planes.
IC64-6 Low scattering high resolution ionization chamber with 6 by 6 cm sensitive area, 64
readout strips in each axis and dual gap integral readout section.
PX-3 Very low scattering pixelated ionization chamber with 120 pixels over 4 cm diameter
sensitive area.
6.2 Power supplies
PSU24-40-1R +24 VDC 40W PSU (universal voltage input, plug receptacle for standard IEC
C14 three-pin socket) with output lead terminated in two-pin Redel PAG connector.
Figure 1. Redel PAG two-pin power connector
CAB-LR-3-REDEL Cable Switchcraft LR 2.1mm jack to Redel PAG connector.
PD-8 Eight output +24 VDC power supply unit, 19” rack mounting.
6.3 Signal cables and cable accessories
CAB-D44M-xxLN-D44F Cable, multiway low-noise, DSub 44 pin male to DSub 44 way
female, xx feet long.

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CAB-L304M-xxLN-L304M Cable multiway low-noise, Lemo 0B 4-pin to Lemo 0B 4-pin, xx
feet long.
CAB-SHV-xx-SHV Cable, coaxial HV, SHV to SHV, xx feet long.
6.4 Data cables
Single fiber optic cables are needed for digital logic connections. Pairs of cables are needed for
communication channels. Cables are available as simplex (single) or duplex (twinned).
CAB-ST-HCS-XX-ST Fiber-optic cable (simplex) 200 µm silica fiber step index multimode, ST
terminated with color-coded boots, XX feet long.
Figure 2. Fiber optic cables ST bayonet terminated
CAB-RJ45-XX-RJ45 CAT 5 Ethernet cable XX feet long.
6.5 Digital signals
CAB-ST-HCS-XX-ST Fiber-optic cable (simplex) 200 µm silica fiber step index multimode, ST
terminated with color-coded boots, XX feet long.
X22 Bi-directional Fiber optic / TTL converter. Allows the I128rev5 to communicate with
systems using TTL logic signals.

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Figure 3. X22 Bi-directional fiber optic / TTL converter
6.6 Relay connections
CONN-PHCOMBI8_3.5 Phoenix Contact MINI COMBICON DFMC, 8 Way 3.5mm Pitch
Pluggable Terminal Block.

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7 Intended Use and Key Features
7.1 Intended Use
The I128r5 is intended to provide complete readout and control for position-sensitive ionization
chambers and similar charged particle beam sensing devices. The I128 revision 5 introduces
changes specifically intended to make it better suited to use in large-scale particle therapy
systems. The changes are summarized in section 7.3.
A single I128r can read out a 64 by 64 cathode strip chamber which also includes an integral
plane cathode. Two I128s can read out a 128 by 128 strip chamber and two integral planes.
Such chambers are typically used to provide beam analysis in particle beam therapy systems.
The integral plane input provides a choice of I-V converter or gated integrator operation. The
former is particularly suited to measurement of continuous beams such as those delivered by
isochronous cyclotrons or slow extraction synchrotrons, and the latter is particularly suited to
measurement of pulsed beams such as those delivered by synchrocyclotrons or fast-cycling
synchrotrons.
In order to convert measured currents from such ion chambers to the current in the ion beam
passing through the chamber, it is necessary to know the beam energy, the chamber geometry,
the filling gas constituents, and the filling gas pressure and temperature. The I128r5 includes
inputs that allow it to measure the pressure and temperature directly using sensors that may be
integrated in the chamber. The translation to beam current is typically carried out by the host
computer system.
The I128r5 can of course by used in any application where a large number of small positive
currents must be simultaneously measured.
The I128r5 includes a powerful real-time processor which allows it to analyze incoming data as
fast as it is gathered. Interlock decisions can be made based on these analyses, and the condition
of integrated relays can be set accordingly.
The I128r5 provides fiber-optic communication channels which allow it to control slave devices.
A complete system can be built up around a single I128r5 in many cases. The fiber-optic
channels can also communicate peer-to-peer with other controllers in larger systems.
The I128r5 has design features which make it tolerant of electrically noisy environments. The
revision 5 hardware differs from earlier I128 versions by introducing fiber optics in place of TTL
electrical connections to better isolate the device from electrical interference.
The place of use is otherwise assumed to be clean and sheltered, for example a laboratory or light
industrial environment. The unit may be used stand alone or networked with other devices and
integrated into a larger system. Users are assumed to be experienced in the general use of
precision electronic circuits for sensitive measurements, and to be aware of the dangers that can
arise in high-voltage circuits.
7.2 Key Features
Single highly integrated and compact device providing all services needed for a position-
sensitive ionization chamber.

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One hundred and twenty eight fully-parallel electrometer channels.
One multi-range current to voltage (I-V) converter channel (known as channel 0 or HCC). By
software selection this can be operated as an I-V converter or as a gated integrator, according to
need (future option).
Internal data buffering to permit contiguous data blocks to be acquired at high rates.
Optional high voltage output for detector biasing with remote loopback for verification.
Environmental sensor port for reading temperature, pressure and humidity in an ionization
chamber.
On-board processors allow real time peak fitting and dose control.
General purpose parallel input/output port with analog and digital lines, available for ionization
chamber monitoring or other purposes.
Pneumatic actuator control port.
Interlock relay inputs and outputs including a safety-rated relay.
Gate input and output for triggering on external events, and trigger distribution.
Monitor output for dosimetry monitor unit (MU) pulse output.
Ethernet interface with TCP/IP and UDP messaging.
Slave devices can be connected to the I128r5 via the fiber optic interface.
Dedicated fiber optic control lines for proton therapy accelerator control.
Fast data streaming option for returning raw multichannel signal to a remote device via a fiber
optic channel.
7.3 Changes in the I128 rev5
Revision 5 included various changes aimed particularly for its application in proton therapy
nozzle systems. It is not directly form-fit-function compatible with earlier revisions, but it can
be substituted with some changes to cables and signal types. The following changes should be
noted:
 Add analog direct monitor output for channel 0 signal.
 Front-panel keyswitch removed (override function moved to rear panel status header
connector)
 Environmental sensor signals moved to a separate 9 pin DSub connector, removing need
for adaption (ADAP-ENV-D9F-D25M no longer required). Remaining I/O from D25
connector of earlier I128 versions moved to a 9 pin DSub male connector.
 Parallel BNC alternative input added for channel 0 (dose plane input).
 Gate in and out renamed to beam OK in and out and changed from TTL levels on Lemo
00 to fiber optic light signals on ST bayonet receive and transmit connectors.

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 Monitor output renamed to Q-pulse out and changed from TTL levels on Lemo 00 to
fiber optic light signal on ST bayonet transmit connector.
 New fiber optic digital signals added for respiratory gate in/out and snap scan
synchronization (future feature).
 Fiber optic communication port 2 allocated specifically as real time controller
synchronization port.
 Fiber optic communication port 2 allocated specifically as ACI connection port.
 Connector type and pin allocations changed for status and relays.
 RS-232/RS-485 port removed.
Summary of control signal equivalences and changes:
Figure 4. Summary of control signal changes introduced in the revision 5 I128
An internal switch in the I128r5 configures internal data lines to match the I128 revision 4
arrangement. Setting to the switch to the “REV 4” position gives the I128r5 backwards
compatibility with revision 4 firmware releases.
I128 rev5 I128 rev 4 and earlier
Location Signal name Type Conn Location Signal name Type Conn
Fibers Beam OK in f/o rx ST Coax Gate in TTL Lemo 00
Fibers Beam OK out f/o tx ST Coax Gate out TTL Lemo 00
Fibers Resp gate in f/o rx ST (not included)
Fibers Resp gate out f/o tx ST (not included)
Fibers A560 synch port f/o rx ST Fibers Comm port 1 f/o rx ST
Fibers A560 synch port f/o tx ST Fibers Comm port 1 f/o tx ST
Fibers ACI comm port f/o rx ST Fibers Comm port 2 f/o rx ST
Fibers ACI comm port f/o tx ST Fibers Comm port 2 f/o tx ST
Fibers Enable out f/o tx ST Fibers Enable beam f/o tx ST
Fibers Inhibit out f/o tx ST Fibers Process status f/o tx ST
Fibers Q pulse out f/o tx ST Coax Monitor out TTL Lemo 00
Fibers Snap scan out f/o tx ST (not included)
Status hdr Status out Relay contacts Status 3,4 Hdr 8pin Enabled status Relay contacts Status 5,6
Status hdr Safety bypass in FPGA i/p Status 6 Key Diagnostic mode set Mode key
Status hdr Enable in Opto diode Status 7,8 Hdr 8pin Enable cmd Opto diode Status 3,4
(not included) Hdr 8pin Mode key state out Relay contacts Status 7,8
Relays hdr Safety relay Relay contacts Interlocks 3,4 Hdr 5pin Interlock Relay contacts Interlock 3,4
Relays hdr Fast relay Relay contacts Interlocks 7,8 Hdr 4pin Relay Relay contacts Relay 3,4

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I128r5 User Manual I128r5_UM_190923 Page 18 of 123
Specification
Electrometer inputs
Number One hundred and twenty-eight, independent parallel
Input impedance < 3 kohm
Dynamic current range -50 nA to +550 nA typical, all integration times.
Higher current ranges achieved by input current division can
be chosen as factory-configuration options.
Dynamic charge range 32 pC (55 µsec integration) to 500 pC (1 msec integration)
Longer accumulations up to 0.255 sec achieved by numerical
summation.
Noise charge <= 0.1 pC rms typical at 100 µsec integration, no averaging
<= 0.05 pC rms typical at 1000 µsec integration, no averaging
Input offset current < 10 pA (+ or -) before zero correction
Offset drift < 2 pA over one hour, after stabilisation and with temperature
maintained to +/- 2 C. measured with 1 msec integration, 100
sample per reading.
Integration time range 55, 60, 75, 100, 125, …. 975, 1000 µsec
Gain uniformity Better than 0.1% across all channels after calibration
Calibration current 500.00 +/- 0.1 nA; temperature coefficient <= 5 ppm C-1
Digitization 24 bit delta-sigma, conversion rate linked to integration
period.
Conversion rate 18.1 kSa/s maximum
Simultaneity All channels converted at once (within 200 nsec)
Integral plane input (I-V converter mode)
Number One, parallel BNC and four-pin Lemo 0B connectors.
Input impedance < 1 ohm
Dynamic range +/- 20 µA down to < +/- 1 nA
Input offset current < 1 nA (+ or -) before zero correction
Offset drift < 0.01% relative to full scale in use over one hour, after
stabilisation and with environmental temperature maintained
to +/- 2 C.
Ranges Four; 20 µA, 10 µA, 5 µA, 1 µA

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Calibration current 2.5000 +/- 0.0005 nA; temperature coefficient <= 5 ppm C-1
External accuracy Better than 0.05% of full scale in use
Digitization 16 bit, 250 kSa/s
Downsampling Block averaging to match the electrometer inputs averaging
time.
Integral plane monitor output
Number One, front panel BNC
Signal type Buffered analog output tapped from I-V converter circuit.
Voltage range +/- 5 volts, corresponding to full scale of the selected current
range.
Bandwidth Typical bandwidth (-3 dB) DC to 35 kHz on 10 µA and 20
µA ranges, DC to 1 kHz on 1 µA and 5 µA ranges.
Compliance Able to drive a 50 ohm load.
Integral plane input (gated integrator mode – future option)
Number One (software selectable alternative to I-V converter)
Input impedance < 3 kohm
Dynamic current range < 1 pA to > 100 µA
Dynamic charge range < 0.1 pC to >10 nC
Input offset current < 6 pA (+ or -) before zero correction
Offset drift < 0.5 pA over one hour, after stabilisation and with
environmental temperature maintained to +/- 2 C; measured
with 10 pF feedback and 100 msec integration.
Noise charge <= 0.01 pC rms typical at 100 µsec integration, no
summation
<= 0.02 pC rms typical at 1000 µsec integration, no
summation
Integration time range 55 µsec to 1 msec
Feedback capacitors 100 pF and 3400 pF
Calibration current 500.00 +/- 0.1 nA; temperature coefficient <= 5 ppm C-1
External accuracy Better than 0.1% of full scale in use
Digitization 16 bit, conversion rate linked to integration period
Environmental monitor I/O port
Number One, nine pin Dsub female

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Inputs One differential analog inputs +/- 10 VDC (for temperature,
pressure and humidity sensing)
Two TTL digital inputs
Outputs Two TTL digital outputs (f for IC sensor mux control)
General I/O port
Number One
Inputs One differential analog input +/- 10 VDC
Outputs Two analog outputs +/-10 VDC
Two TTL digital outputs
24 VDC output and return
Actuator control
Number One.
Outputs Potential free relay contact pair.
+24 VDC output and return.
Inputs Two opto isolator inputs for limit switch readback.
High voltage outputs
Number One.
Output power 1 watt
Voltage options 20 to 200 V. Line <0.01%, Load <0.05%, Ripple <0.01%
50 to 500 V. Line <0.01%, Load <0.01%, Ripple <0.01%
100 to 1250 V. Line <0.001%, Load <0.005%, Ripple
<0.001%
200 to 2000 V Line <0.01%, Load <0.01%, Ripple <0.001%
HV monitoring Independent loopback HV input
Monitor unit output
Number One, ST connector
Signal Visible light 640 nm
Pulse width 50 nsec
Charge increment User-defined charge measured on integral plane input will
result in one monitor pulse.