OM 21

OM 21 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. 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 21 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 21 is fully programmed by the user, either directly through the instrument interface or through LOG OM data management software delivered in option: choice of measuring current, resistance range, measuring unit, metal under test, alarms, triggering conditions, storage of measurement…

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, the electronic calibration of the instrument is performed without any internal adjustment.

For use on test benches, you might want to consider OM 22 micro-ohmmeter instead of OM 21. It has the exact same specifications of OM 21 but is more adapted to repetitive measurement tasks. While OM 21 can be either manually or automatically operated and is fully programmable by the user through the instrument interface, OM 22 has 6 set configurations inside to be selected by the user. More information over OM 22 here.

Resistance measurement

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

Max. open circuit voltage: 3 V (can be limited to 20 mV or 50 mV at the terminals of the resistor to be measured)

Further features

General specifications

Environmental specifications

Safety specifications

Instrument:

OM 21-1                 Programmable benchtop micro-ohmmeter

                            With RS 232 interface

OM 21-2                 Programmable benchtop micro-ohmmeter

                            With RS 232 interface and battery + charger

OM 21-3                 Programmable benchtop micro-ohmmeter

                            With RS 232 interface and IEEE 488

OM 21-4                 Programmable benchtop micro-ohmmeter

                            With RS 232 interface, IEEE 488 and battery + charger

Clips and probes:

Please note that 2 clips are needed per OM 21.

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 21

                            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