OM 16

picto fleche Onsite 10 A micro-ohmmeter for inductive and non-inductive resistance

Designed for field use, OM 16 onsite micro-ohmmeter performs 4-wire measurements of inductive and non-inductive resistances with continuous, pulse or AC measuring current up to 10 A.

  • Accuracy: 0.05%
  • Resolution: 0.1 µΩ
  • Ranges: Selectable from 5 mΩ up to 2.5 KΩ
  • Auto power-off of current
  • Continuous measurement current for inductive loads
  • Pulse measurement current for non-selfic résistances
  • Automatic compensation of thermal E.M.F.
  • Temperature compensation
  • Metal temperature compensation
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Designed for field use as well indoor as outdoor, OM 16 onsite micro-ohmmeter performs 4-wire measurements of inductive and non-inductive resistances with continuous, pulse or AC measuring current up to 10 A. Offering a high accuracy of 0.05 % and resolution of 0.1 µΩ, it works over a large selectable range of resistances from 5 mΩ up to 2.5 KΩ.

All parameters are user-programmable, either directly through the instrument interface or via Log OM software delivered in option: measuring current, range, unit, alarmes, automatic average function, absolute autozero. Before every measurement, EMFs are measured and automatically removed for a greater accuracy of measurements. For non-inductive resistances, a single operator is enough to perform the measurement since it will be automatically triggered once continuity is established between the two points.

The user can also set the metal nature or its temperature coefficient, the reference temperature and the ambient temperature. The ambient temperature might be also measured by an external temperature probe.

2 alarm thresholds are programmable and either notified by a signal displayed on the screen, a light or a loud beeper.

The large interactive display of OM 16 informs in real time the operator about the type of measurement, range, calculation conditions and threshold values.

Battery-powered, OM16 has a high storage capacity of 1,000 measurements to be read directly on the display or via Log OM software or printer available in option.

Protection up to 250 V is ensured at every measurement terminal, while any overrange, open circuit or empty battery signal detected is notified by LEDs and messages displayed.

Easy-to-use, rugged and protected agains rough environment (IP 53 when opened, IP 64 when closed), OM 16 is widely used indoors and outdoors in many industries:

  • Aerospace
  • Energy field
  • Domestic electrical appliances
  • Cable manufacturing
  • Telecommunication
  • Electronics
  • Automotive industry
  • Railway

Key features:

  • Test current: 1 mA to 10 A
  • 4-wire measurement
  • Auto power-off of current
  • Continuous measurement current for inductive loads: Coils, transformers, motor windings, twisted cables…
  • Pulse measurement current for non-selfic resistances: Earth bonding, ground continuity, contact resistances, non-twisted cables…
  • Automatic compensation of thermal E.M.F.
  • Temperature compensation
  • Metal temperature compensation

Performances and technical specifications @23°C ±5°C

Uncertainty is given in % of reading + fixed value.

Resistance measurement

Measurement rangeResolutionAccuracy / 1 year
(23°C ±5°C)
Measuring currentVoltage drop
5 mΩ0.1 μΩ0.05 % + 0.5 μΩ10 A50 mV
25 mΩ1 μΩ0.05 % + 3 μΩ10 A250 mV
250 mΩ10 μΩ0.05 % + 30 μΩ10 A2.5 V
2500 mΩ0.1 mΩ0.05 % + 0.3 mΩ1 A2.5 V
25 Ω1 mΩ0.05 % + 3 mΩ100 mA2.5 V
250 Ω10 mΩ0.05 % + 30 mΩ10 mA2.5 V
2500 Ω100 mΩ0.05 % + 300 mΩ1 mA2.5 V

Automatic or manual selection of measurement range
Possible excess over the nominal range:

  • 5 mΩ range: + 20 %
  • 25 mΩ range: + 20 %

Maximum voltage between the terminals in an open circuit: 7 V
Current waveform: Continuous or pulse DC current

Ambient temperature measurement for Tref compensation

TypeRésolutionPrécision sur 1 an
(23°C ±5°C)
Remarque
Pt1000,1°C0,5°CMesure par Pt100 externe ou valeur saisie au clavier

Further features

Resistance types
  • Inductive resistances: Coils, transformers, motor windings, twisted cables...
  • Non-inductive resistances: Earth bonding, coating, contact résistances, non-twisted cables...
Measurement trigger conditionsManual or automatic trigger allowing a single operator to be able to perform measurements
EMFsAutomatic compensation of EMF parasites before each measurement for a greater accuracy
Temperature compensation- Ambient temperature Tamb, measured with external Pt100 (or entered by the user
- Programmed reference temperature Tref, to which the measured value is converted:
R(Tref) = [R(Tamb) * (1 + α * Tref)] / [1 + α * Tamb]
- Metal material, whose temperature coefficient can be entered by the user (α)
Temperature coefficient beyond operating range<10% accuracy/°C (from 0 to18°C and from 28 to 50°C)
Alarms2 programmable thresholds with visuel and sound signal

General specifications

Size L x W x H270 x 250 x 180 mm
Weight4 kg
Supply100 to 240 V (50 / 60 Hz)
Batteries (option)Type: Ni/Mh 8.5 Ah
Charging time: 5 h
Battery life: 5,000 measurements at 10 A
Communication portsRS 232
Storage capacity1,000 measurements identified by numbers
Memory reading directly on the display, via software or printer

Environmental specifications

Reference range23°C ± 5°C (RH: 45 to 75 % w/o condensing)
Operating reference range0 to 50°C (RH: 20 to 75 % w/o condensing)
Limit operating range-10°C to +55°C (RH: 10 to 80 % w/o condensing)
Storage temperature limits-40°C to +60°C
IP protectionIP53 according to EN60529

Safety specifications

Protections
  • Electronic protection up to 250 V for ‘voltage’ wires
  • Fuse protection for ‘current’ wires
  • Protection against ‘current’ circuit breaking during inductive resistance measurements
ClassIn accordance with EN 61010-1
Category II, pollution 2
Rated voltage60 V
Chocks and vibrationsEN61010-1
EMC conformityImmunity

  • EN 61000-4-2
  • EN 61000-4-3
  • EN 61000-4-5
  • EN 61000-4-6
  • EN 61000-4-11

EN 61000-4-4
Conducted and radiated emissions:

  • EN 55022, class B
  • EN 61000-3-2
  • EN 61000-3-3

Instrument:

OM16                  On-site micro-ohmmeter

                            Supplied in standard with:
                            - Standard mains supply cable to recharge the battery
                            - Quick start manual

Clips and probes:

Please note that 2 clips are needed per instrument.

AMT005              Long handspike, per unit

                            Needle diameter: 3 mm, length without handle: 83 mm, total length: 215 mm, cable length: 5 m

AMT006              Large kelvin clip, per unit

                            Opening diameter: 25 mm, cable length: 5 m

AMT011              Small handspike, per unit

                            Needle diameter: 3 mm, total length: 125 mm, cable length: 5 m

AMT012              Small kelvin clip, per unit

                            Opening diameter: 12 mm, cable length: 5 m

AMT013              Triggered handspike, per unit

                            Needle diameter: 3 mm, length without handle 83 mm, total length: 215 mm, cable length: 5 m

Triggering cable to be connected by RS 232

AMT008              Extension lead, length: 20 m

AMT014              External Pt100 temperature sensor

AMT015              Extension cable for AMT014, length: 2 m

Other accessories:

LOG OM             Configuration & exploitation software for OM 16 - Includes a F / F RS 232 cable

AN5909              RS232 F / F cable (PC connection)

AN5875              RS232 F / M cable (Printer connection)

Certification:

QMA11EN          COFRAC certificate of calibration

Packing information:

Size                    270 x 250 x 180 mm

Weight                4 kg

ProductDescriptionReleaseType
Accessories

Brochure for clips, probes and further accessories

07 / 2014pdf
LOG OM

Data management software

B.05zip
OM 16

Firmware

A.04exe
OM 16 EN

Instruction manual

pdf