OM 22

picto fleche Industrial benchtop micro-ohmmeter – High accuracy: 0.03 %

OM 22 Industrial benchtop micro-ohmmeter is used for 4-wire measurement of very low resistance values up to 20 KΩ with an accuracy of 0.03% RDG and a 0.1 µΩ resolution. Programmable, it is particularly suited for use on test benches with repetitive measurement tasks. The reliability and accuracy of the measurements is improved by a low temperature coefficient of 10 ppm/°C, automatic removal of EMF parasites before each measurement, metal temperature compensation and compensation of ambient temperature.

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OM 22 benchtop micro-ohmmeter is used for 4-wire measurement of very low resistance values up to 20 KΩ with an accuracy of 0.03% RDG and a 0.1 µΩ resolution. Programmable, it is particularly suited for use on test benches with repetitive measurement tasks. The reliability and accuracy of the measurements is improved by a low temperature coefficient of 10 ppm/°C, automatic removal of EMF parasites before each measurement, metal temperature compensation and compensation of ambient temperature.

With three current waveforms available -continuous, pulse or AC current- from 100 µA to 10 A and high flexibility of trigger and sampling conditions, OM 22 low resistance ohmmeter covers a wide range of applications: Cable resistance and resistivity measurement, inductive resistance measurement (motors and transformers winding resistance), contact resistance measurement (connectors, switches, relays…), test of low power electrical components (fuses…) and heat sensitive devices, metallisation / earth bonding and ground continuity measurement.

OM 22 is a programmable instrument, ideal for use on test benches: it has 6 configurations to be modified and recalled by users upon request through the 6 direct keys on the front board. Every configuration defines every measurement aspects: range, current waveform and value, number of measurements per cycle with temporisation, storage conditions, temperature compensation, measuring unit, metal under test, calculations of coil heating or W/km, alarm settings, maximum measurement voltage, analogue output, trigger conditions…

If necessary, OM 22 configurations can be modified through LOG OM data management software delivered in the standard package.

Up to 1,000 samples can be stored inside the instrument and be recalled directly on the display or on computer via LOG OM.

Powered from mains or from rechargeable batteries in option, the electronic calibration of the instrument is performed without any internal adjustment.

Resistance measurement

RangeResolutionAccuracy at 90 days
(23°C ±1°C)
Measuring currentVoltage drop
2 mΩ0.1 μΩ0.05% + 0.3 μΩ10 A20 mV
20 mΩ1 μΩ0.05% + 2 μΩ10 A200 mV
20 mΩ1 μΩ0.05% + 3 μΩ1 A20 mV
200 mΩ10 μΩ0.05% + 10 μΩ10 A2 V
200 mΩ10 μΩ0.05% + 20 μΩ1 A200 mV
200 mΩ10 μΩ0.05% + 30 μΩ100 mA20 mV
2 Ω100 μΩ0.05% + 100 μΩ1 A2 V
2 Ω100 μΩ0.03% + 200 μΩ100 mA200 mV
2 Ω100 μΩ0.03% + 300 μΩ10 mA20 mV
20 Ω1 mΩ0.03% + 1 mΩ100 mA2 V
20 Ω1 mΩ0.03% + 2 mΩ10 mA200 mV
20 Ω1 mΩ0.03% + 3 mΩ1 mA20 mV
200 Ω10 mΩ0.03% + 10 mΩ10 mA2 V
200 Ω10 mΩ0.03% + 20 mΩ1 mA200 mV
200 Ω10 mΩ0.03% + 30 mΩ100 µA20 mV
2 kΩ100 mΩ0.03% + 100 mΩ1 mA2 V
2 kΩ100 mΩ0.03% + 200 mΩ100 µA200 mV
20 kΩ1 Ω0.03% + 1 Ω100 µA2 V

Automatic or manual selection of measurement range
Accuracy given in % of reading + counts over 90 days at 23 ±1°C
Maximum capacity: 26,000 counts

Further features

Configurations6 configurations available, to be modified if necessary with LOG OM software delivered in standard
Resistance types
  • Inductive resistances: Coils, transformers, motor windings...
  • Non-inductive resistances: Earth bonding, coating, contact resistances...
Measuring current
  • Internal or external source
  • DC current from 100 µA to 10 A
  • Continuous, pulsed or pulsed alternated
Measurement time< 1 s in direct current mode
< 1,5 s in pulse current mode
< 2 s in alternate current mode
Measurement trigger conditionsManual or automatic trigger from 2 measures/s to 1 measure/9h, allowing a single operator to be able to perform measurements
EMFsAutomatic compensation of EMF parasites before each measurement for a greater accuracy
Temperature compensationChoice of metal temperature coefficient
Choice of ambient temperature (programmed or measured with external probe)
Temperature compensation at 20°C: Resolution: 0.1°C, accuracy: ±0.5°C
(R20 = Resistance compensated at ambient temperature equal to 20°C
Temperature coefficient beyond operating range< 10% accuracy/°C
Relative measurementsDisplay L = R-R0 or L = 100 x (R-R0)/R0 in %
Where L: read value, R: measured value and R: reference value either recalled from memory or entered by the operator
Coil heating calculationCoil heating calculation according to ambient temperature, original coil resistance at ambient temperature, coil resistance once heated and coil material
Alarms2 programmable thresholds with visual and sound signal and relay outputs
Outputs
  • Two relays (1 A / 220 VAC)
  • 1 analogue output 0 – 2.5 V (load >= 2.5 kΩ, resolution: 10 mV, accuracy: ±10 mV)
CalibrationDigital calibration without internal adjustment

General specifications

Size225 x 88 x 310 mm
Weight2 to 3 kg depending on options
DisplayLCD 26,000 counts, 16 figures lighted, 11.5 mm high
Power supply115 / 230 V (50 / 60 Hz)
Battery with internal charger(option)Type: 12 V battery pack
Battery life: 2 to 8 h according to use
Charging time: 14 h
Communication ports
  • RS 232 in standard
  • IEEE 488-2 in option

Allows programming, data management and unit calibration directly from a computer

Storage capacity1,000 measurements with average, minimum and maximum value
Memory reading directly on the display or through digital and analogue interfaces

Environmental specifications

Reference range23°C ±1°C (RH: 45 to 75% w/o condensing)
Operating reference range0 to 50°C (RH: 20 to 80% w/o condensing)
Limit operating range-10°C to +50°C (RH: 10 to 80% w/o condensing)
Storage temperature limits-30°C to +55°C
(-15°C to +50°C for model with battery)
Protection IPIP40 according to EN60529
Maximum altitude2,500 m

Safety specifications

Protections
  • Electronic protection for ‘voltage’ wires
  • Fuse protection for ‘current’ wires
  • Protection against ‘current’ circuit breaking during inductive resistance measurements
ClassIn accordance with EN 61010-1
Category III, pollution 2
Rated voltage50 V
Chocks and vibrationsEN61010-1
EMC conformityImmunity:

  • EN 50082-1/1992

Conducted and radiated emissions:

  • EN 55022, class B
  • Radiated: IEC 801-3/1984
  • Conducted: IEC 801-4/1988
  • Electrostatic discharges: IEC 801-2/1991

Instrument:

OM 22-1                 Industrial benchtop micro-ohmmeter

                            With RS 232 interface

OM 22-2                 Industrial benchtop micro-ohmmeter

                            With RS 232 interface and battery + charger

OM 22-3                 Industrial benchtop micro-ohmmeter

                            With RS 232 interface and IEEE 488

OM 22-4                 Industrial benchtop micro-ohmmeter

                            With RS 232 interface, IEEE 488 and battery + charger

Delivered in standard with LOG OM configuration software 

Clips and probes:

Please note that 2 clips are needed per OM 22.

AN5806-2               Gold plated Kelvin clips, set of 2

                            Opening diameter: 12 mm, cable length: 2 m

AN5806C               Kelvin clips, set of 2

                            Opening diameter: 12 mm, cable length: 3 m 

AMT003                 Test probe, per unit

                            Cable length: 5 m

AMT004                 Kelvin clip, per unit

                            Opening diameter: 25 mm, cable length: 3 m

Other accessories:

LOG OM                Configuration & exploitation software for OM 22

                            Including RS 232 cable

AN6901                 Soft case for benchtop instruments

AMT002                 External power supply 3 V – 10 A 

AN5883                 Bracket mounting for panel installation (T2 box type)

AN5884                 Rack mounting kit for rack installation (T2 box type) 

AN5875                 RS232 9p F cable

AN5836                 IEEE 488 cable

                            Length: 2 m

AN8009                 Set of 10 fuses – 16 A

Certification:

QMA11EN              COFRAC certificate of calibration

ProductDescriptionReleaseType
Accessories

Brochure for clips, probes and further accessories

07 / 2014pdf
Aoom2x

Labview© driver

A.08zip
LOG OM

Data management software

B.05zip
OM 22 EN

Instruction manual

pdf