OM 17

Designed for field use -in workshops or outdoors-, OM 17 micro-ohmmeter is a field instrument, whose performances are as high as a laboratory instruments’. Succeeding OM 16, OM 17 offers upgraded performances, in particular for inductive resistance measurements: Granted with a greater autonomy, OM 17 allows longer test campaigns to be performed at 10 A with continuous current (up to 60 min) and offers faster current loading of coil resistances (stabilization time < 2 s). Easy to use, it carries out 4-wire measurements of inductive and non-inductive resistance with a continuous or pulse DC current up to 10 A. Offering a high precision of 0.05% and a 0.1 µΩ resolution, it has a different ranges selectable from 5 mΩ to 2.5 kΩ.

Key features:

• 4-wire measurement of inductive and non-inductive resistance
• Continuous or pulse DC current, from 1 mA to 10 A
• Precision: 0.05% Reading
• Automatic EMF compensation
• Ambient temperature compensation (measured or programmed)
• Compensation of metal temperature coefficient
• Choice of reference temperature
• 2 programmable thresholds with visual and sound alarm
• Memory: 1,000 measurements identified
• Ideal for long tests at 10 A continuous over transformers

Easy to use, rugged and protected against rough environment (IP 53 when opened / IP 64 when closed, lockable measurement plugs), OM 17 is widely recommended for indoor and outdoor use in many industries:

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

Various fields of applications

• Metallization and earth bonding control
• Welding quality control
• Contact resistance measurement (low voltage connectors, relays…)
• Test of electronic components
• Coil, transformer and motor resistance measurement, loss and heat rise calculation
• Non-twisted and twisted cable resistivity measurement and length calculation
• Railway and electric network maintenance

Two current waveforms

Continuous DC current

• Inductive resistance and coils
• Automatic trigger of measurements when using a trigger test probe
• EMF compensation before measurements

Courant pulsé

• Non-inductive resistance
• Automatic trigger of measurements as continuity is established – 1 operator needed
• Automatic current shutdown at the end of a measurement
• EMF compensation before every measurement

Configuration and display

All parameters are user-programmable, either directly through the instrument interface or via software (LOG OM, available in option) : Measuring current, range, resistance type, unit, reference temperature, alarm threshold value & status and calculation... OM 17 large display informs the operator in real time about the measurement itself and the measuring conditions. Any detection of range overshoot, open circuit or low battery is indicated by LEDs and message displayed on the screen. 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. Battery-powered, OM 17 has a high storage capacity of 1,000 measurements to be read directly on the display or via Log OM software. 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.

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

Uncertainty is given in % of reading + fixed value.

Resistance measurement

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

Typical measurement campaigns of inductive resistances (on rotors / stators 1-3 m³)

(1) Measurement at cold condition, at instrument start      (2) Measurement at hot condition, after a 1st test campaign

Further features

General specifications

Environmental specifications

Safety specifications

Instrument:

OM17                  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 17 - 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