OM 16
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
- 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
| Measurement range | Resolution | Accuracy / 1 year(23°C ±5°C) | Measuring current | Voltage drop |
|---|---|---|---|---|
| 5 mΩ | 0.1 μΩ | 0.05 % + 0.5 μΩ | 10 A | 50 mV |
| 25 mΩ | 1 μΩ | 0.05 % + 3 μΩ | 10 A | 250 mV |
| 250 mΩ | 10 μΩ | 0.05 % + 30 μΩ | 10 A | 2.5 V |
| 2500 mΩ | 0.1 mΩ | 0.05 % + 0.3 mΩ | 1 A | 2.5 V |
| 25 Ω | 1 mΩ | 0.05 % + 3 mΩ | 100 mA | 2.5 V |
| 250 Ω | 10 mΩ | 0.05 % + 30 mΩ | 10 mA | 2.5 V |
| 2500 Ω | 100 mΩ | 0.05 % + 300 mΩ | 1 mA | 2.5 V |
Ambient temperature measurement for Tref compensation
| Type | Résolution | Précision sur 1 an(23°C ±5°C) | Remarque |
|---|---|---|---|
| Pt100 | 0,1°C | 0,5°C | Mesure 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 conditions | Manual or automatic trigger allowing a single operator to be able to perform measurements |
| EMFs | Automatic 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) |
| Alarms | 2 programmable thresholds with visuel and sound signal |
General specifications
| Size L x W x H | 270 x 250 x 180 mm |
|---|---|
| Weight | 4 kg |
| Supply | 100 to 240 V (50 / 60 Hz) |
| Batteries (option) | Type: Ni/Mh 8.5 AhCharging time: 5 hBattery life: 5,000 measurements at 10 A |
| Communication ports | RS 232 |
| Storage capacity | 1,000 measurements identified by numbersMemory reading directly on the display, via software or printer |
Environmental specifications
| Reference range | 23°C ± 5°C (RH: 45 to 75 % w/o condensing) |
|---|---|
| Operating reference range | 0 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 protection | IP53 according to EN60529 |
Safety specifications
| Protections | Electronic protection up to 250 V for ‘voltage’ wiresFuse protection for ‘current’ wiresProtection against ‘current’ circuit breaking during inductive resistance measurements |
|---|---|
| Class | In accordance with EN 61010-1Category II, pollution 2 |
| Rated voltage | 60 V |
| Chocks and vibrations | EN61010-1 |
| EMC conformity | ImmunityEN 61000-4-2EN 61000-4-3EN 61000-4-5EN 61000-4-6EN 61000-4-11EN 61000-4-4Conducted and radiated emissions:EN 55022, class BEN 61000-3-2EN 61000-3-3 |
