AOIP OM 17 User manual

OM 17
ONSITE MICRO OHMMETER
User Manual
September 2018

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OM 17
Onsite micro ohmmeter
User Manual

LIMIT OF GUARANTEE AND LIMIT OF RESPONSABILITY
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OM 17
LIMIT OF GUARANTEE AND LIMIT OF RESPONSIBILITY
AOIP S.A.S guarantees the absence of faulty materials and the manufacture of this product under normal
conditions of use and maintenance. The guarantee period is one year and takes effect on the date of delivery.
Parts, repairs to the product and service are guaranteed for a period of 90 days. This guarantee only applies
to the original purchaser or the end user if he is a client of a AOIP S.A.S approved distributor and does not
cover fuses, interchangeable batteries/cells nor any product which, in the opinion of AOIP S.A.S, has been
badly handled, modified, neglected or damaged by accident or subjected to abnormal conditions of use or
handling. AOIP S.A.S guarantees that the software will function largely in accordance with its functional
specifications for a period of 90 days and that it has been correctly recorded on nondefective media. AOIP
S.A.S does not guarantee that the software contains no errors or that it will operate without interruption.
AOIP S.A.S approved distributors shall apply this guarantee to products sold to new clients it has not served,
but are not authorised to offer a longer or different guarantee in the name of AOIP S.A.S. Guarantee support
is offered if the product was purchased by an intermediary from an AOIP S.A.S approved point of sale or if the
purchaser has paid the applicable international price. AOIP S.A.S reserves the right to invoice the purchaser
for the costs of importing, repair or replacement parts if the product purchased in one country was sent to
another country for repair.
The obligations under the guarantee of AOIP S.A.S are limited at the discretion of AOIP S.A.S, to
reimbursement of the purchase price, or the free repair/replacement of a defective product returned within the
period of the guarantee to an AOIP S.A.S approved service center.
To claim for service under the guarantee, contact the nearest AOIP S.A.S agent or send the product,
accompanied by a description of the problem, carriage and insurance paid (free on board destination), to the
nearest AOIP S.A.S approved service centre. AOIP S.A.S declines any responsibility in the event of damage
occurring during transportation. After repair under guarantee, the product will be returned to the purchaser,
carriage paid (free on board destination). If AOIP S.A.S considers that the problem was caused by abusive
treatment, modification, an accident or abnormal conditions of operation or handling, AOIP S.A.S will submit a
quotation for the cost of repair and will only commence the repair after receiving authorisation. After repair, the
product will be returned to the purchaser, carriage paid, and the costs of repair and transportation will be
invoiced to him.
THIS GUARANTEE IS EXCLUSIVE AND REPLACES ANY OTHER GUARANTEES, EXPLICIT OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED GUARANTEE AS TO THE SUITABILITY OF THE
PRODUCT TO BE SOLD OR APPLIED TO A PARTICULAR PURPOSE OR USE. AOIP S.A.S SHALL NOT
BE HELD RESPONSIBLE FOR ANY PARTICULAR INDIRECT, ACCIDENTAL OR CONSEQUENTIAL
DAMAGE, NOR ANY CORRUPTED OR LOST DATA, WHETHER AS A RESULT OF AN INFRACTION OF
THE OBLIGATIONS OF THE GUARANTEE, OR ON A CONTRACTUAL, EXTRA-CONTRACTUAL OR
OTHER BASIS.
Because some countries or states do not permit limitations to an implied condition of guarantee, or the
exclusion or limitation of accidental or consequential damage, the limitations and exclusions of this guarantee
may not apply to every purchaser. If any condition of this guarantee is considered invalid or inapplicable by a
competent court, such a decision will in no way affect the validity or binding nature of any other condition.

CONTENT
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OM 17
CONTENT
A. GENERAL ...................................................................................................................................................................................................................................................................................6
A.1 INTRODUCTION..................................................................................................................................................................................................................................................................................6
A.2 APPLICATIONS...................................................................................................................................................................................................................................................................................6
A.3 MAIN CHARACTERISTICS...................................................................................................................................................................................................................................................................7
A.4 SAFETY PROVISIONS..........................................................................................................................................................................................................................................................................7
Compliance with Safety Standards .............................................................................................................................................................................................................................................7A.4.1 Following Instructions supplied with the accompanying Documents ..........................................................................................................................................................................................7A.4.2 Taking Measurements ................................................................................................................................................................................................................................................................7A.4.3 Instructions to be followed before Use........................................................................................................................................................................................................................................7A.4.4 Faults and abnormal Constraints...............................................................................................................................................................................................................................................8A.4.5 Table of Symbols used................................................................................................................................................................................................................................................................8A.4.6 Maintenance ..............................................................................................................................................................................................................................................................................8A.4.7
B. DESCRIPTION............................................................................................................................................................................................................................................................................9
B.1 General View..........................................................................................................................................................................................................................................................9
B.2 DISPLAY ..........................................................................................................................................................................................................................................................................................10
B.3 ACCESSORIES ..................................................................................................................................................................................................................................................................................11
Delivered with the Unit............................................................................................................................................................................................................................................................11B.3.1 Options delivered to order .......................................................................................................................................................................................................................................................11B.3.2
C. OPERATION.............................................................................................................................................................................................................................................................................12
C.1 REMINDERS OF THE 4-WIRE PRINCIPLE............................................................................................................................................................................................................................................12
C.2 PERFORMING A MEASUREMENT ......................................................................................................................................................................................................................................................12
Switching On .........................................................................................................................................................................................................................................................................14C.2.1 Selecting the Range ...............................................................................................................................................................................................................................................................14C.2.2 Selecting the Measurement Mode.............................................................................................................................................................................................................................................14C.2.3 Ambient temperature compensation ......................................................................................................................................................................................................................................18C.2.4 Setting Alarms .......................................................................................................................................................................................................................................................................19C.2.5 Connecting to Connectors........................................................................................................................................................................................................................................................19C.2.6 Standby (STBY) Position ........................................................................................................................................................................................................................................................20C.2.7
C.3 LIST OF ERROR MESSAGES ..............................................................................................................................................................................................................................................................21
C.4 CONFIGURING THE UNIT ...............................................................................................................................................................................................................................................................22
Principle..................................................................................................................................................................................................................................................................................22C.4.1 Direct Access Key....................................................................................................................................................................................................................................................................22C.4.2 Entering a Number ..................................................................................................................................................................................................................................................................22C.4.3 Programming Menu Table.......................................................................................................................................................................................................................................................23C.4.4 Managing an Alarm Threshold: ALAr......................................................................................................................................................................................................................................24C.4.5 Using the DB9 Connector: rS ..................................................................................................................................................................................................................................................24C.4.6 Managing and printing Memory Content: mEm.......................................................................................................................................................................................................................24C.4.7 Programming the temperature compensated measurement Value.......................................................................................................................................................................................28A.1.1
CONFIGURATION AND OPERATION COMMANDS USING THE RS232 SERIAL LINK..................................................................................................................................................29
C.5 INTRODUCTION................................................................................................................................................................................................................................................................................29
Command Errors...............................................................................................................................................................................................................................................................30A.1.2
C.6 LIST OF COMMANDS ........................................................................................................................................................................................................................................................................31
C.7 GENERAL COMMANDS.....................................................................................................................................................................................................................................................................32
C.8 PROGRAMMING COMMANDS ...........................................................................................................................................................................................................................................................33
C.9 MEMORY USAGE COMMANDS .........................................................................................................................................................................................................................................................36
C.10 OTHER INFORMATION COMMANDS................................................................................................................................................................................................................................................38
C.11 LOGOM PROGRAM .......................................................................................................................................................................................................................................................................38
Installation ........................................................................................................................................................................................................................................................................38A.1.3 Use....................................................................................................................................................................................................................................................................................38A.1.4
D. MAINTENANCE.......................................................................................................................................................................................................................................................................40
D.1 OPENING/CLOSING THE UNIT ..........................................................................................................................................................................................................................................................40
D.2 BATTERY PACK...............................................................................................................................................................................................................................................................................42
Charging.................................................................................................................................................................................................................................................................................42D.2.1 Replacing the Battery ..............................................................................................................................................................................................................................................................42D.2.2
D.3 FUSES ..............................................................................................................................................................................................................................................................................................42
D.4 CHECKING PERFORMANCE ..............................................................................................................................................................................................................................................................43
D.5 MANAGING MAINTENANCE.............................................................................................................................................................................................................................................................43
D.6 UPDATING THE ON-BOARD SOFTWARE ...........................................................................................................................................................................................................................................44
D.7 ADJUSTMENT...................................................................................................................................................................................................................................................................................45
Environment............................................................................................................................................................................................................................................................................45D.7.1 Adjusting the Unit....................................................................................................................................................................................................................................................................45D.7.2
D.8 WARRANTY.....................................................................................................................................................................................................................................................................................46
E. SPECIFICATIONS....................................................................................................................................................................................................................................................................47
E.1 APPLICABLE STANDARDS ................................................................................................................................................................................................................................................................47
Safety Class .............................................................................................................................................................................................................................................................................47E.1.1 EMC Conformity......................................................................................................................................................................................................................................................................47E.1.2 Ambient Conditions..................................................................................................................................................................................................................................................................47E.1.3 Mechanical Conditions ............................................................................................................................................................................................................................................................47E.1.4 Measurement under Reference Conditions ...............................................................................................................................................................................................................................47E.1.5
E.2 CHARACTERISTICS...........................................................................................................................................................................................................................................................................48
General....................................................................................................................................................................................................................................................................................48E.2.1 Resistance measuring function.................................................................................................................................................................................................................................................48E.2.2 Protections...............................................................................................................................................................................................................................................................................48E.2.3
E.3 END OF UNIT SERVICE LIFE .............................................................................................................................................................................................................................................................49
Waste Generated by the Unit....................................................................................................................................................................................................................................................49E.3.1 Unit Destruction Procedure .....................................................................................................................................................................................................................................................49E.3.2
F. ANNEXES..................................................................................................................................................................................................................................................................................50
F.1 UNIT MAINTENANCE PROGRAMMING DIAGRAM..............................................................................................................................................................................................................................51
F.2 DIAGRAMME DE PROGRAMMATION ET DE LECTURE DE L'APPAREIL.................................................................................................................................................................................................52

PRESENTATION
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OM 17
A. GENERAL
We are very grateful to you for choosing this AOIP S.A.S accuracy measuring instrument which benefits from
our hundred years experience in the manufacture of high quality, accuracy measuring instruments.
Because of this, we are able to continue our policy of continuous innovation which has served our customers
so well for the last 100 years. AOIP S.A.S encourages your comments and would willingly accept
any suggestions from you to help us to perfect our know-how and improve our future products .
A.1 Introduction
The OM 17 microhmmeter is used to perform 4-wire low resistance measurements from 0.1 µΩ (resolution) to
2,500 Ω over seven ranges.
Made in a sturdy and heavy-duty housing, autonomous in operation, it is well suited for on-site measurements.
A.2 Applications
Its main applications are listed below:
Metallic coating measurement, especially in aeronautics.
Ground continuity measurement.
Resistance measurement over motors and transformers.
Contact resistance measurement.
Component measurement.
Electric cable resistance measurement.
Mechanical bond tests.

SAFETY A
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A.3 Main Characteristics
•Programming and operating the unit using a 14-key keypad: selection of range, measurement mode
(low inductive or inductive resistance), temperature compensation and measurement triggering.
•Measurement memory function.
•Programmable alarms that are triggered when thresholds are exceeded.
•Portable unit with battery pack comprising five Ni-MH accumulators, 8.5 Ah (D cell size).
Battery pack recharge: A charger built into the OM 17 recharges the batteries by connecting the unit to the line
(90 V/264 V, 45 Hz/420 Hz), using a standard cord.
Recharge time: 5 hours.
Endurance: 5,000 measurements using a 10 A current level in low inductive mode.
•4-wire measurement with automatic compensation of spurious voltages.
•Automatic compensation of ambient temperature by measuring it using an external sensor or by
manual entry and programming of the metal type or its temperature coefficient.
•LCD display.
•Direct display of the measurement together with its unit, range, measurement mode and if required,
temperature compensation.
Measurement can be triggered from the keypad, remotely, or in automatic mode.
•Sealed, sturdy casing.
•Dimensions: 270 mm x 250 mm x 180 mm.
•Weight: approximately 4 kg
A.4 Safety Provisions
Compliance with Safety StandardsA.4.1
The unit has been constructed and tested in accordance with safety rules relating to electronic measuring
instruments.
This instruction manual contains information and cautionary advice that users must follow to: protect
themselves against electrical shocks, ensure the reliability of the unit, and make sure that the unit is not used
in a way that could damage it or make it unsafe for use.
Following Instructions supplied with the accompanying DocumentsA.4.2
The unit is constructed to operate in complete safety as long as the instructions supplied with the
accompanying documents are followed. Any usage, except those described, may impair operator safety and is
therefore dangerous and prohibited..
Taking MeasurementsA.4.3
The test leads and measuring wires must be in good condition and should be changed if there is any evidence
of deterioration (insulation split, burnt, etc.).
Never exceed the safety values indicated in the specifications.
Never connect the unit to a live circuit.
When the unit is measuring resistance showing a high inductive component (transformers, motors, etc.) after
ending the measurement (with the measurement current cut-off), the unit then discharges this inductance
and displays the icon for this entire duration.
Never disconnect the connection wires before this icon disappears.
Instructions to be followed before UseA.4.4
a) Charging batteries
During battery charge, instrument must be placed on a flat surface with cover opened, in order to connect
instrument to the main power supply. (The cable plug and the main are creating a disconnecting device ) .
During battery charge, any other cable must be disconnected and removed from the instrument
Power cable must remain the one supplied with the instrument (H03VVH2-F2).

GÉNÉRALITÉS
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OM 17
The OM 17 unit has been mechanically and electrically tested prior to shipping. It has been handled with all of
the necessary care to ensure that it reaches the user undamaged.
It is, however, good practice to perform a quick check in order to detect any deterioration that may have taken
place in transit. If any deterioration is found, declare any reservations to the carrier immediately.
b) Return Shipping
If return shipping is required, the unit should preferably be sent back in its original packaging, with a note
attached to it stating as clearly as possible the reason for its return.
Faults and abnormal ConstraintsA.4.5
Should there be any indication that the protection of the unit has been compromised, it should be switched off
and steps taken to prevent it being used inadvertently.
Protections may have been compromised in the following cases, for example:
The unit is obviously damaged.
The unit is no longer capable of taking accurate measurements.
The unit has been stored under unfavourable conditions.
The unit has been subjected to severe stresses during transport.
Table of Symbols usedA.4.6
Symbol
Description
Double insulation.
Warning: see the accompanying
documents.
Measurement earth terminal.
MaintenanceA.4.7
The fuse replacement of the instrument, the fuse located on the battery replacement and adjusting the
instrument procedure are described in chapter E
The unit should be reassembled as explained in the instruction manual. If the unit is incorrectly or incompletely
reassembled, the operator’s safety may be compromised.
The responsible body must check on a regular basis that none of the components ensuring safety has
deteriorated, and undertake all the necessary steps for preventive operations.
Before the casing is opened, make sure that the measuring leads have been disconnected from the unit and
that the mains cord is also disconnected.
The unit should not be opened up for adjustment, maintenance or repair unless this is absolutely essential, in
which case this work should be carried out only by qualified personnel advised of the risk entailed

SAFETY A
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B. DESCRIPTION
B.1 General View
11 12 13
1
2
3
10 4
5
6
7
9
8 15 14 16
KEY
FUNCTION
1
Programming menu
2
Range selection
3
Measurement and automatic triggering modes
4
Temperature compensation
5
Alarms
6
Memories
7
Start or stop measurement
8
On/Off
9
Lighting
10
Measurement connectors
11
Power connector for recharging the battery pack
12
Pt100 connector
13
RS232 connector/"trigger" connector
14
Cursor keys
15
READY LED
16
AL1 and AL2 LEDs

DESCRIPTION
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OM 17
B.2 Display
Liquid Crystal Display (LCD), with icons and two number fields.
Two number fields. One with 4 digits and one with 5 digits and their units. The ambient temperature level is
displayed on the top line in "temperature compensation" mode.
The bottom line is used to display the measured values.
Errors are indicated by the appropriate messages.
1 2 3 4 5
13 6
14
12 7
11
10 9 8
REPERE
FONCTION
1
Buzzer on
2
Battery condition
3
Temperature compensation function on
4
Metal selection for measurement compensation mode
5
PC or printer communication in service
6
Memory usage level
7
Measurement units
8
Unit status: "Standby" or "Operate"
9
Measurement modes
10
Measurement range and current level
11
Danger do not disconnect the measurement wires
12
Not used
13
Alarms switched on and activation direction selected
14
REMOTE PRINT
MEM
MR Unit is PC controlled
Print memories
Store measurements in memory
Read memories

Matériel B
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B.3 Accessories
Delivered with the UnitB.3.1
A standard mains cord for recharging the battery pack.
An instruction manual.
Options delivered to orderB.3.2
AMT 005: Dagger style test probe.
AMT 006: Kelvin clip, 25 mm jaw.
AMT 008: Extension cable, 20 meters long for clips and probes.
AMT 011: Compact test probe.
AMT 012: Kelvin clips, 12 mm jaw.
AMT 013: Dagger style test probe, remotely triggered.
AMT 014: Temperature sensor.
AMT 015: Extension cable, 5 meters long for AMT 014 temperature sensor.
Software
LogOM: PC software + RS232 cable. This software is used to read the measurements stored and to configure
the unit.
Communication cables
AN5909: RS232 cable for connecting the OM 17 to a PC.
AN5875: RS232 cable for connecting the OM 17 to a printer.
ER 41057-000: Europe model mains cord.
ER 41057-001: UK model mains cord.
ER 41057-0002: US model mains cord.
REMARK: The clips and test probes are sold individually and not in pairs.
Certification
QMA11EN Calibration certificate COFRAC
QMA30EN factory test report

MEASUREMENT
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OM 17
C. OPERATION
C.1 Reminders of the 4-wire Principle
The principle of this connection is shown in the diagram below.
Ri = Unit internal resistance.
Rf = Measurement wire resistance.
Rc = Contact resistance.
Rx = Resistance to be measured.
From a DC voltage source U, a generator supplies a current of value I.
A voltmeter measures the voltage drop Ux at the terminals of the resistance to be measured Rx and displays
Rx = Ux / I.
The result is not affected by the other resistances encountered in the current loop (Ri, Rf, Rc), as long as the
total voltage drop induced across Rx remains below the voltage supplied by the source U
(5 VU 6 V). The maximum admissible wire resistance level is Rf≈ (U-Ux) / I
C.2 Performing a Measurement
1. Press to switch the unit on.
2. Press to choose the measurement range.
3. Press to choose the measurement mode:
inductive, low inductive, low inductive and automatic triggering.
4. Press to implement temperature compensation.
5. Press to switch the alarms on.
6. Connect the measurement wires to the connectors and connect them to the resistors.
7. Press to start measurements.
Rc
R
R
R
R
R
Rx
Rc

PROGRAMMING C
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8. The unit displays the measurement value or an error message.
9. Press to stop measurements (the measurement process is automatically switched off in low
inductive mode).

MEASUREMENT
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Switching On
C.2.1
Press the button shown above to switch the unit on.
Important: Always choose the correct mains frequency for your location (5O or 60 Hertz) (refer to
section E.5. "Managing Maintenance").
The unit is powered by its NI-MH battery pack.
If the battery's charge level is too low, the unit displays:
During a measurement, Err 01.
In standby:
The user must then recharge the battery (refer to Section 5). The unit cannot perform measurements while
it is charging.
Selecting the RangeC.2.2
Press this button as many times as necessary to select the range.
The range and the measurement current are displayed on-screen.
Ranges (Ohm)
Measurement
current (A)
0.005
10 A
0.025
10 A
0.250
10 A
2.500
1 A
25
0.1 A
250
0.010 A
2 500
0.001 A
Selecting the Measurement ModeC.2.3
Press this button as many times as necessary to select the measurement mode.
The display shows:
Inductive resistance measurement
Low inductive resistance measurement
Low inductive resistance measurement and automatic triggering
-+

PROGRAMMING C
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a) "Inductive Resistance" Measurement Mode
This mode is intended for performing measurements on transformers, motors and any inductive component.
Make sure that the display shows thec icon.
From the standby position, to start a cycle:
Press.
Check that the "current" and "voltage" wires are correctly connected: if they are incorrectly connected, the
display shows an error message with a number (Err 11: "current" wires incorrectly connected, Err 12:
"voltage" wires incorrectly connected). The unit returns to the standby position and will continue its cycle
once the connections are correct.
With the current switched off, the residual voltage (U0) across the resistor terminals is measured. If this
voltage level is too high, the unit displays Err 13.
The current (I) is switched on: it remains permanent until the unit returns to "standby".
The voltage across the resistor terminals (U1) is measured and the measurement R = (U1 –U0) / I is
displayed.
All subsequent measurements comprise only a Un measurement as Uo remains in memory.
The cycle is stopped by pressing .
Operating diagram:
C = connection check
0 = residual voltage measurement (stored).
1,2,3…n = successive voltage measurements across the resistor terminals.
Interval between two measurements: 120 ms.
The delay time specified for the first measurement (1,200 ms) is an indication only; it may vary depending on
the load level measured.
REMARKS:
1. If the range is exceeded, the unit displays Err 07.
2. The current source is thermally protected (measurement at 10A for a length of time in excess of a few tens
of seconds causes heating). In this case a safety feature cuts the current and the unit displays
Err 05.
We recommend letting the unit cool off before performing a new measurement.
3. Any change of range will stop the cycle and the unit returns to standby.
4. After a measurement cycle, the unit fully discharges the inductance. Returning to standby implies waiting
for the complete discharge of the inductance by the OM 17. During discharge, the unit displays the
icon. For operator safety reasons, during this time and as long as this icon is displayed, it is
essential not to touch the connection wires.
b) "Low Inductive Resistance" Measurement Mode
123n
C
0
OPER
MES
I
STBY
100ms
640ms
1200ms
120ms

MEASUREMENT
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OM 17
This mode is intended for measuring contact and metal plating resistance levels, and as a general rule, any
resistance level with a time constant that is less than a few milliseconds. In this mode only one
measurement is performed per cycle.
Make sure that the display shows the icon.
The advantages of this mode include:
Increasing unit autonomy.
Reduced power consumption as the current is cut between measurements.
Less heating of the measured resistor.
Improved compensation of stray emfs as these are measured and compensated before each resistance
measurement.
From the standby position, to start a cycle:
Press .
Check that the "current" and "voltage" wires are correctly connected: if they are incorrectly connected, the
display shows an error message with a number (Err 11: "current" wires incorrectly connected, Err 12:
"voltage" wires incorrectly connected). The unit returns to the standby position.
With the current switched off, the residual voltage (U0) across the resistor terminals is measured. If this
voltage level is too high, the unit displays Err 13 and returns to standby position.
The current (I) is switched on.
The voltage across the resistor (U1) is measured, then the current is cut.
The measurement R = (U1 –U0) / I or an error message Err 07 is displayed, if an overrange occurs.
Return to the standby position at the end of the measurement. The unit is ready to perform another
measurement.
Operating diagram
Example: two measurement cycles
C = connection check
0 = residual voltage measurement
M = measurement of the voltage across the resistor terminals.
REMARKS:
If the range is exceeded, the unit displays Err 07.
M
O
C
M
O
C
OPER
MES
I
STBY
360ms
240ms
100ms
360ms
240ms
100ms

PROGRAMMING C
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c) "Low Inductive Resistance and Automatic Triggering" Measurement Mode
This mode is intended only for measuring resistance levels without a time constant. The use of the dagger
prod connector detailed in the accessories section is recommended.
From the standby position, to start a cycle:
Press to start the cycle.
Connect the wires to the resistor. The unit waits until it detects that the currents and voltage wires are
connected correctly.
Residual voltage (U0) measurement across the resistor terminals.
The measurement current (I) is established, the voltage across the resistor terminals (U1) I measured and
the measurement R = (U1-U0)/I is displayed.
To start a new measurement cycle: Release at least one connection, then reconnect it.
To stop the cycle, press .
REMARKS:
If the range is exceeded, the unit displays Err 07.
Any change of range will stop the cycle and the unit returns to the standby position.
It is possible to store and compensate measurements while the cycle is running.

MEASUREMENT
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OM 17
Ambient temperature compensation
C.2.4
a) Principle
The metals used in the windings of certain components (for example, the copper wire used in transformer or
motor windings) have high temperature coefficients of the order of 0.4%/°C (for copper or aluminium). This
leads to resistance level measurements that are highly dependent on the temperature of the component.
The "Temperature Compensation" function can be accessed by pressing the key. It is used to return
the resistance value, which is dependent on the ambient temperature (whether measured or programmed), to
the value that it should have at a reference temperature level:
The compensated resistance level is expressed as follows:
R(Tref)= R(Tamb) * (1 + alpha* Tref )
1 + alpha*Tamb
R(Tamb) the resistance value measured at ambient temperature
Tamb the temperature level measured by a Pt100 probe or programmed by the user
alpha the temperature coefficient of the chosen metal (Aluminium, Copper, "Other metal")
Tref the programmed reference temperature to which the measurement level is returned
These parameters are programmable ones (refer to sub-section 3.4).
b) Using the Compensation Function
Check parameter programming (see sub-section 3.4.8) and the connections made.
Press this key; the unit displays the following information on-screen:
R (θ), the chosen metal and the temperature levels Tref then Tamb.
Select the range and the measurement mode, and press the key.
The unit performs a measurement cycle and directly displays the compensated resistance value and,
depending on how it is programmed, displays one of the following:
1. The programmed ambient temperature level.
2. The temperature level measured by the temperature sensor.
3. "- - - -" if the temperature sensor is validated but:
is incorrectly or not connected at all.
the measured temperature level is out of range (from –10°C to 55°C).
If a temperature level is out of range or if the sensor wires become disconnected, the unit displays Err 10.

PROGRAMMING C
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Setting AlarmsC.2.5
Alarms are validated by successively pressing this key. The unit displays one of the following:
Alarm 1 and the trigger direction.
Alarm 2 and the trigger direction.
Alarm 1 and Alarm 2 and their trigger directions.
These value and direction parameters are user programmable (see sub-section 3.4.5: "Managing an Alarm
Threshold").
The AL1 and AL2 LEDs light up when the respective programmed threshold values are reached.
Connecting to ConnectorsC.2.6
The measurement wires are connected using lockable cylindrical connectors.
Any drop in the voltage on the load terminals is measured between the two "voltage" (U) wires.
The current wires I can deliver a current level that varies from 1 mA to 10 A.
Male Connector mâle +
A : Voltage pin U
B : Current pin I
C : Current pin I
D : Current pin I
Male Connector -
A : Voltage pin U
B : Current pin I
C : Current pin I
D : Current pin I
The DB9 connector is used to trigger remote measurements ("TRIG").
On the trigger test prod, the "READY" LED indicates that a measurement can be made.
The DB9 connector is used for RS232 communication with a PC or a printer.
The main connection pins used are:
Male connector
PC
OM 17
Female connector
Pins
Pins
Rx
3
Tx
Tx
2
Rx
Gnd
5
5
Gnd
Female connector
Printer
OM 17
Female connector
Pins
Pins
Rx
2
Rx
Tx
3
Tx
CTS
8
CTS
A "Pt100" type thermometric resistor can be connected to the unit (using an extension cable if necessary) to
perform compensated measurements. The use of a temperature sensor listed in the Accessories section is
recommended.
Trigger button to start the measurement
READY LED

MEASUREMENT
20 / 55 NTA47262-000A6
OM 17
Pt100 connector
Standby (STBY) PositionC.2.7
The READY LED is lit when a measurement can be performed.
This is the standby position that the unit returns to at the end of a measurement cycle after:
the user presses this key
changes the measurement mode
every low inductive mode measurement, or if an error is detected.
It is characterized by a pause before a new measurement cycle begins.