LEM ITZ FLEX ULTRASTAB User manual

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ITZ FLEX ULTRASTAB
USER GUIDE

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TABLE OF CONTENTS
TABLE OF CONTENTS .......................................................................................................................... 2
LIST OF FIGURES .................................................................................................................................. 3
LIST OF TABLES .................................................................................................................................... 3
DOCUMENT INFORMATION.................................................................................................................. 3
INTRODUCTION ..................................................................................................................................... 4
RECEIVING AND UNPACKING.............................................................................................................. 6
GENERAL SPECIFICATIONS FOR RACK ELECTRONICS.................................................................. 7
1Compliance with regulations............................................................................................................ 8
2Usage precautions and recommendations...................................................................................... 9
2.1 Terms and symbols ................................................................................................................. 9
2.2 General use and wear ............................................................................................................. 9
2.3 Grounding considerations........................................................................................................ 9
2.4 Fuses ....................................................................................................................................... 9
2.5 Precautions for use................................................................................................................10
3Quick start...................................................................................................................................... 11
3.1 System overview ................................................................................................................... 11
3.2 Setting up............................................................................................................................... 12
4Introduction .................................................................................................................................... 14
4.1 Main features ......................................................................................................................... 14
4.2 Standard transducer heads ................................................................................................... 14
4.3 Custom transducer heads ..................................................................................................... 15
4.4 Voltage output module........................................................................................................... 15
4.5 Current conversion ratio and programmability ......................................................................15
4.6 Front ...................................................................................................................................... 17
4.7 Rear ....................................................................................................................................... 18
4.8 Transducer head ................................................................................................................... 19
5Installation...................................................................................................................................... 20
5.1 Mounting requirements for the electronics unit .....................................................................20
5.2 Mounting requirements for the transducer heads..................................................................20
5.3 Grounding the transducer head.............................................................................................21
5.4 Installation.............................................................................................................................. 21
6Offset adjustment .......................................................................................................................... 22
6.1 Adjusting the current offset....................................................................................................22
7. I/0-ports.......................................................................................................................................... 23
7.1 Analog Out connector ............................................................................................................ 23
7.2 4 mm “Banana” Current Output terminals ............................................................................. 23
7.3 Status/Interlock connector ..................................................................................................... 24
8Absolute maximum ratings ............................................................................................................ 26
9Sweep function during overload status ......................................................................................... 26
10 Thermal protection..................................................................................................................... 26
11 Over current protection - Electrical specifications .....................................................................26
12 Transducer head connector....................................................................................................... 28
13 Operating instructions................................................................................................................28
13.1 Switching on power ............................................................................................................... 28
13.2 Using the ITZ FLEX ULTRASTAB in current mode...............................................................28
13.3 Connecting directly to a current measuring device ...............................................................29
13.4 Connecting to an external burden resistor (current output)...................................................30
13.5 Connecting the ITZ FLEX ULTRASTAB to a DMM or high impedance amplifier (voltage
output) 30
14 Theory of operation ................................................................................................................... 31
14.1 Basic principle of ITZ FLEX ULTRASTAB current transducers ...........................................31
15 Maintenance .............................................................................................................................. 32

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LIST OF FIGURES
Figure 1: System overview for Current Output ...................................................................................... 11
Figure 2: System overview for Voltage Output...................................................................................... 11
Figure 3: Front panel of electronics rack ...............................................................................................17
Figure 4: Back panel of electronic rack ................................................................................................. 18
Figure 5: Analog out connector pinout ..................................................................................................23
Figure 6: Wiring schematics to current measuring device ....................................................................29
Figure 7: Wiring schematics to external burden resistor .......................................................................30
Figure 8: Wiring schematics to high impedance load............................................................................ 30
Figure 9: Block diagram showing the zero flux detector principle......................................................... 31
LIST OF TABLES
Table 1: General specifications for rack electronics................................................................................ 7
DOCUMENT INFORMATION
05.01.2012 Creation of user manual
Version: 0
06.02.2013 Replaced Manual title by user guide
title (page 1) + Replaced LEM Danfisik by LEM
Switzerland + Added picture page 11
Modified some pictures
Version: 1
28.05.2014 Updated completely according to the
datasheets
Version: 2

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INTRODUCTION
Congratulations with your purchase of LEM ITZ FLEX ULTRASTAB.
The ITZ FLEX ULTRASTAB system provides a flexible yet user-friendly platform for
use in laboratory, test facility and industrial applications where the highest
performance flux-gate current sensing is needed. The platform offers full-scale
current sensing from 600 A and up to 24000 A by utilizing a broad range of
compatible current measuring heads.
Please read this user guide carefully before use. It contains information on how to set
up and use the ITZ FLEX ULTRASTAB and how to build an ultrahigh precision
system. In case of unanswered questions do not hesitate to contact either LEM
Switzerland S.A. or our local distributor directly.
IMPORTANT: LEM Switzerland S.A. will not be held responsible for use of the ITZ FLEX
ULTRASTAB unit under conditions and/or in application setups not supported by the information in
this user guide.

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WARRANTY STATEMENT

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RECEIVING AND UNPACKING
The shipping material and the ITZ FLEX ULTRASTAB should be thoroughly
inspected for signs of obvious physical damage immediately upon receipt.
All materials in the package should be checked against the enclosed packing list and
the list of standard delivery below. LEM Switzerland S.A. will not be responsible for
any shortages unless notified no later than 14 days after receiving.
The LEM ITZ FLEX ULTRASTAB package should contain:
•19 inch rack-mount ITZ FLEX ULTRASTAB electronics
•Transducer head – depending on nominal current range
•European (Schuko) and US mains cable with three-pin IEC female connector
•Cable for connecting head and rack electronics
•Analog output cable
•Current short-plug and analog out short-plug
•Final manufacturing test check-list.
IN CASE OF DAMAGE
If the equipment is damaged in any way, a claim should be filed with the shipping
agent, and a full report of the damage should be forwarded to LEM Switzerland S.A.
or our local representative immediately upon receiving.
Upon receipt of this report, LEM Switzerland S.A. will forward instructions concerning
the repair, replacement or return shipment.
Please include the Type No., Serial No., and Order No. for the ITZ FLEX
ULTRASTAB on any communication with LEM Switzerland S.A. or our local
representative.

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GENERAL SPECIFICATIONS FOR RACK ELECTRONICS
Electrical Data – MAINS INPUT
Mains Input
100-240 V AC, 50/60 Hz
IEC-type inlet socket
Fuses
2.5 AT / 240 V AC
Internal fuses, not user-
replaceable
Electrical data – ANALOG OUTPUT PORT
Full-scale output current
±1 A (± 2 or ± 3 A)
-S and –SB versions
Full-scale output voltage
± 10 V
-SB versions
Output impedance
< 1 Ohm
-SB versions
Electrical data – STATUS/INTERLOCK PORT
Max collector-emitter
voltage, off-state
60 V
Max reverse collector-
emitter voltage, off-state
5 V
Max collector-emitter
current, on-state
10 mA
On-state saturation
collector-emitter voltage
< 0.2 V
Physical data – Electronics rack
Dimensions
482x88x430 mm
WxHxD, including handles and
connectors
Weight
8.4 kg (9.2-10.0kg)
Value for 600-5000 A systems
(10 kA/16 kA–24 kA systems)
Operating conditions
Temperature
10 .. 40 °C
Relative humidity
20 .. 80 % RH
Cooling
Internal fan
Storage conditions
Temperature
-20 .. 85 °C
Relative humidity
20 .. 80 % RH
Table 1: General specifications for rack electronics

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1 Compliance with regulations
FCC statement
This equipment complies with the limits for a Class A digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference in which case the user will
be required to correct the interference at his own expense.
CE statement
This product has been tested and found to comply with the following
standards.
Electrical safety: IEC/EN 61010-1
Electromagnetic Compatibility:
Emission: IEC/EN 61326-1:2006
FCC 47 CFR Part 15
Immunity: IEC/EN 61326-1:2006
A technical file is kept available at:
LEM Switzerland S.A.
Chemin des Aulx 8
P.O. Box 35
1228 PLAN-LES-OUATES
Geneva, Switzerland

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2 Usage precautions and recommendations
The following precautions are recommended to insure your safety and to
provide the best operating conditions of this instrument. If this equipment is
used in a manner not specified by the manufacturer, the protection provided
by the equipment may be impaired.
2.1 Terms and symbols
These terms and symbols may appear in this manual or on the product.
2.2 General use and wear
CAUTION: Do not place any heavy objects on the instrument.
Avoid severe impacts or rough handling that could damage the instrument.
Use electrostatic discharge precautions while handling and making connections to the
instrument.
Do not place bare or unterminated wires into the connectors of the instrument, only
mating connectors and adapters.
Do not block or obstruct the ventilation openings on the side panels and over the heat
sink.
2.3 Grounding considerations
To avoid the risk of electrical shock it is mandatory to observe proper
grounding practices.
WARNING: To avoid electrical shock the power cord protective grounding
conductor must be connected to earth ground.
All transducer heads must be connected to earth ground as described in section
5.3.
Failure to establish a functional ground connection to earth may lead to
hazardous errors and cause malfunction and/or measurement inaccuracies.
2.4 Fuses
WARNING: The unit has no user replaceable fuses. In the event that fuses need
replacement please consult your local LEM Sales representative. Please include Type
and Serial no. with all communication with LEM Switzerland or the local representative.
!
WARNING: Warning statement identifying condition or practices that
could result in human injury or loss of life.
!
CAUTION: Caution statement identifying conditions or practices that
could result in damage to the product.
DANGER: High Voltages.
Protective Ground Conductor Terminal.
!
!
!

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2.5 Precautions for use
Due to the nature of the zero-flux based transducer principle it is necessary to
take the following precautions:
CAUTION: Do not subject the system to primary current without mains power applied.
CAUTION: Do not operate the system with a disconnected secondary when the system
is subject to primary current.
!
!

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3 Quick start
3.1 System overview
Figure 1: System overview for Current Output
Figure 2: System overview for Voltage Output

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3.2 Setting up
To quickly get your new ITZ FLEX ULTRASTAB system operational, follow the
instructions given below.
1. Connect the transducer head to the unit using the supplied transducer head
cable and mount the programming plug in the connector on the transducer
head if your system has the programming feature – please note that not all
transducer heads are programmable.
2. Connect a Digital Multimeter (DMM) to the unit.
If your unit has current output (-S or –SPR versions):
The primary access is through the Analog Output Port, using the Current
Output Adaptor supplied with the ITZ system.
The unit also has a secondary output through the 4 mm banana terminals on
the back panel of the ITZ unit. Since the primary and secondary current
outputs are connected electrically in series internal to the electronics
the 4 mm banana terminals should be left shorted (using the supplied
shorting plug) for this exercise.
CAUTION: It is MANDATORY that the secondary current path remains CLOSED
whenever the system is powered – if not, there is a risk of permanently damaging the
system. Furthermore, if there is no closed secondary current path the system will not be
able to produce measurable output. The secondary current path is closed either by
shorting the 4mm banana terminals or by connecting a series (measuring) resistor at
these outputs.
Using standard 4 mm banana test leads, connect the red wire on the Current
Output Adaptor to the current input terminal on the DMM and the black wire of
the adaptor to the common terminal on the DMM. Set the DMM to measure
DC current in a range greater than:
•± 1 A for ITZ 600-SPR (-SBPR) and ITZ 2000-SPR (-SBPR)
•± 2 A for ITZ 2000-S (-SB), ITZ 5000-S (-SB), ITZ 10000-S (-SB) and
ITZ 16000-S (-SB)
•± 3 A for ITZ 24000-S (-SB).
IMPORTANT: Refer to page 23 for EMC precautions for the 4 mm banana
terminal port.
!

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If your unit has a voltage output (-SB or –SBPR versions):
Connect the Analog Output Cable to the Analog Output Port. Using standard
4 mm banana test leads, connect the red wire of the cable to the positive
terminal on the DMM and the black wire to the common terminal. Set the
DMM to measure DC/AC voltage in a range greater then ± 10 V.
The blue wire of the cable is connected to the cable shield and to chassis
ground.
Make sure the supplied shorting plug is installed on the 4 mm banana
terminals as described in the previous section.
CAUTION: It is MANDATORY that the secondary current path remains CLOSED whenever the
system is powered – if not, there is a risk of permanently damaging the system. Furthermore, if
there is no closed secondary current path the system will not be able to produce measurable
output. For voltage output versions this is ensured either by shorting the 4 mm banana
terminals using the supplied shorting plug, by connecting a DMM in low-impedance current
measuring mode or by connecting a measuring resistor to the 4 mm banana terminals.
3. Connect the mains cord.
CAUTION: Since the ITZ system has no mains switch the unit will be powered immediately by
inserting the mains cord.
4. The ITZ FLEX ULTRASTAB will now measure the current running through the
transducer head. On the front plate the status of the unit can be monitored
using the status LED panel.
!
!

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4 Introduction
4.1 Main features
The ITZ FLEX ULTRASTAB is a high precision current measuring device
based on the Flux-gate principle. It can measure current in both the DC and
AC domain. The instrument can be configured in a variety of ways to suit the
user’s demands. Amongst the ITZ FLEX ULTRASTAB main features are:
•Current or voltage output
•Input range from 0 to ± 24000 A
•Status signals for interfacing with other equipment
The current measuring range is configurable depending on the transducer
head.
4.2 Standard transducer heads
ITZ FLEX ULTRASTAB can be delivered with the following transducer heads.
1. ITZ 600-25-PR – programmable in steps of 20 A from 40 A to 620 A.
Conversion ratio (default) of 1:600. Nominal secondary current 1 A.
Aperture Ø 25 mm
2. ITZ 2000-50-PR – programmable in steps of 125 A from 125 A to
2000 A. Conversion ratio (default) of 1:2000. Nominal secondary
current of 1 A. Aperture Ø 50 mm
3. ITZ 2000-50 – non-programmable, wide-bandwidth. Conversion ratio of
1:1000. Nominal secondary current of 2 A. Aperture Ø 50 mm
4. ITZ 5000-140 – non-programmable. Conversion ratio of 1:2500.
Nominal secondary current of 2 A. Aperture Ø 140 mm
5. ITZ 10000-100 – non-programmable. Conversion ratio of 1:5000.
Nominal secondary current of 2 A. Aperture Ø100 mm
6. ITZ 16000-150 – non-programmable. Conversion ratio of 1:8000.
Nominal secondary current of 2 A. Aperture Ø 150 mm
7. ITZ 24000-150 – non-programmable. Conversion ratio of 1:8000.
Nominal secondary current of 3 A. Aperture Ø 150 mm
Please note that systems are always downwards compatible in the
sense that a smaller transducer head can be used with the rack
electronics from a larger system. ie., if you have purchased an ITZ
10000-S system you will be able to use a 600 A transducer head with
your rack electronics without any limitations. The system will adapt itself
to this.

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However, the system is not generally upwards compatible. ie., you will
not generally be able to use a larger head with the rack electronics from
a smaller system. If you want to expand the measuring range of your
system by using a larger transducer head, please consult your local LEM
SA Sales representative to obtain information on existing options and
cost.
4.3 Custom transducer heads
For current measurement of 10 kA and beyond certain customizing may be
required. Your local LEM SA Sales representative will be able to assist you
with custom requirements for conversion ratio, programmability options etc.
4.4 Voltage output module
In addition to the different transducer heads a system can also be equipped
with a VOM (Voltage Output Module). This module will convert the output
current to an output voltage of ± 10 V (nominal full-scale).
Two types VOMs are available, one for each nominal output current range (1
or 2 A). In all cases, the output current is also available for monitoring either
by the 4 mm banana jacks on the back panel or with the Analog Output Cable.
If you have ordered your system with the “B” option (eg. ITZ 5000-SB), it
already has a VOM installed. If your system was ordered as a standard
current output system you can have a VOM retrofitted. Please contact your
local LEM SA Sales representative to obtain information on existing options
and cost.
4.5 Current conversion ratio and programmability
The system can generally be considered as a “current transformer also
working at DC”. The primary winding is the wire through the center hole of the
head, and the secondary winding is the compensation winding of the
transducer head. The ratio between these two windings defines the current
conversion ratio (KN) of the system.
The smaller transducer heads come with a programming option.
As the nominal output current (1, 2 or 3 A) is fixed (defined by the transducer
head) and the maximum input current IPM can be changed using a
programming plug, the current conversion ratio can be changed enabling the
user to program the system to many different maximum input currents.

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Example:
A system with an ITZ 2000-50 PR transducer head programmed to 1500 A will
produce 1 A when the primary current is 1500 A. The current conversion ratio
of the system is then:
1500
1
1500
1==
A
A
KN
When a system is equipped with a VOM, the output current will be converted
to a voltage. The maximum nominal output voltage (VS) is fixed at 10 V. Thus
the sensitivity (G) from the example above can be found as:
AV
A
V
G/
150
1
1500
10
==

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4.6 Front
Figure 3: Front panel of electronics rack
On the front of the ITZ FLEX ULTRASTAB there is an LED indicator panel:
POWER:
This LED is lit (Blue) when the unit is on.
ACTIVE:
This LED is lit (Yellow) when the transducer output is active, with IPhigher
than approximately 1% of nominal full-scale output.
HIGH IP:
This LED is lit (Yellow) when the transducer output is active with an IPhigher
than 105% of nominal full-scale output.
OVERLOAD:
This LED is lit (red) when the transducer head saturates due to excessive
primary current.
600 A .. 24000 A:
These LEDs are lit (Yellow) when a transducer head with the corresponding
full-scale range is connected to the ITZ FLEX ULTRASTAB.
CUSTOM:
This LED is lit (Yellow) when the system setup has detected a custom head
configuration.
STATUS:
This LED is lit (Green) when the status of the unit is OK.
Output current offset adjustment
An offset adjustment is positioned next to the left-most handle. The
adjustment is accessible using a miniature slotted screwdriver.
CAUTION: Please refer to section 6 for instructions on how to adjust offset correctly.
!
1
2
1
2

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4.7 Rear
Figure 4: Back panel of electronic rack
All connections on the ITZ FLEX ULTRASTAB are located on the rear of the
unit.
1. IEC power inlet: This connector accepts a standard IEC power cord.
IMPORTANT: The power inlet also serves as mains switch.
IMPORTANT: The unit operates with a universal mains input. This means that the
unit does not require any switching between mains voltages as long as the supplied
mains voltage is within 100-240 V AC (50/60 Hz).
IMPORTANT: The unit has no externally accessible user-serviceable fuses. If the
unit requires replacement of fuses please contact your local LEM Switzerland S.A.
sales representative.
2. Type / Serial number plate. Three individual S/Ns may be listed here:
One for the ITZ electronics, one for the matching head and one
(optional) for the installed VOM.
3. Transducer head: Connection to the transducer head.
4. Analog out: Output connection to a DMM or other equipment, 15 pin D-
Sub female UNC 4-40 screw lock.
5. Current +/-: Secondary current output.
6. Monitor: Voltage output with a low-precision voltage output derived
from the secondary current. Output is ± 1 V full-scale.
7. Status/Interlock signal outputs, 9 pin D-Sub male UNC 4-40 screw lock.
8. Option A+B: These positions are for future expansion or customization.
!
CAUTION: The secondary current path must
be closed with the system powered. This
includes both the current output in the
Analog Out connector and the 4 mm
banana terminals – if one of them is used,
the other must be shorted with the supplied
“Short-plug”.

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Ventilation exit
The main heat sink has an airflow exit centered on the back panel. Inlet holes
are on the side panel of the chassis.
CAUTION: Do not block the airflow to/from the unit.
4.8 Transducer head
The transducer head is connected to the electronics rack using a dedicated
cable with a multi-pin bayonet-style connector. Various cable lengths are
available.
If the transducer head is programmable it also has a 25-pin D-Sub male UNC
4-40 screw lock connector. This connector is used with suitable programming
plugs (accessory) – for further information, please refer to section 4.5 for
further information on programmability.
CAUTION: A programming plug must be connected to the programming port of a
programmable head when the system is powered.
!
!

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5 Installation
5.1 Mounting requirements for the electronics unit
The ITZ FLEX ULTRASTAB can be mounted in either a rack based system or as a
stand-alone unit using the supplied rubber feet.
CAUTION: The unit must be mounted horizontally. To ensure proper cooling,
keep ventilated ides on side and back panel free. Failure to do this may result
in improper cooling of the system which may lead to malfunction of the unit.
5.2 Mounting requirements for the transducer heads
ITZ 600-25-PR: Use the mounting bracket (part no.: 7100088284) to mount
the 600 A transducer head. It may be installed in any orientation.
ITZ 2000-50 (-PR): The 2000 A transducer head must be installed using two
M8 screws. The head may be mounted in any orientation. Please observe that
the length of the screws may not exceed the length D shown in figure 5. To
calculate the maximum length of the mounting screw, measure the thickness
of the mounting substrate C and add the length A + B which is 10 mm
+ 15 mm.
Max. Screw length:
D = 10 + 15 + C [mm]
CAUTION: Using too long screws may cause damage to the inner parts of the
transducer head and lead to malfunction.
ITZ 5000-140 and ITZ 10000-100: These transducer heads are mounted
using four M10 screws inserted into the holes on the brackets. These heads
may be installed in any orientation.
15
10
A
B
C
Transducer core
Mounting plate
Mounting substrate
Mounting screw
D
Figure 5
!