Pulsed current For non-inductive resistance
Advantages:
– Automatic triggering when continuity is established between the two points=> A single operator can perform the test
– Lower heat rise of the resistance under test
– Thermal EMF compensation at each measurement
– Auto power-off of the current:Lower consumption, hence longer autonomy
– Fast sampling time
– No settling time for each measurement
Non-twisted cables
Electronic components
DC current For inductive resistance or self resistance .
Advantages:
– Automatic triggering when used with trigger testing probe
Motors / generators
Coils
Transformers
Twisted cables
AC current For heat sensitive devices (Joule’s law)
Advantages:
– Negative current phase enables the device to cool down
Copper components
Contacts
Pt100
Advantages of AOIP Products:
- True 4 wire measurement to eliminate lead resistance
- Thermal EMFs are measured before sending current and automatically compensated
- Ambient temperature is automatically measured by an integrated temperature sensor and compensated so as to display the resistance value in a controlled 20°C environment
Overview of the range
OM 16 – 0.05 % accuracy + 0.5 µOhm
– Measurement current: 1 mA to 10 A – DC current
– Resolution: 0.1 µOhm
– Range: Up to 2,500 Ohms
– Memory up to 1,000 samples
– Protected up to 250 V
– Resistance compensation according to temperature with metal type selection
– IP 53 protected when opened / IP 64 once the case is closed
– For selfic and non-selfic resistances
OM 10 – 0.05 % accuracy + 0.5 µOhm
– Measurement current: 0.01 mA to 100 mA – DC, pulsed
– Resolution: 10 µOhm
– Range: Up to 50,000 Ohms
– Protected up to 250 V
OM 21 – 0.03 % + 0.1 µOhm
– Measurement current: 100 µA to 10 A – DC, pulsed, AC
current
– Resolution: 0.1 µOhm
– Range: Up to 20,000 Ohms
– Memory up to 1,000 samples
– Protected up to 230 V
– Manual or automatic trigger
– Programmable sampling rate
– 2 programmable thresholds
– Analogue OUTPUT 0 / 2.5 V
OM 22 – 0.03 % + 0.1 µOhm
– Same as OM 21 but delivered with 6 predefined programs that can be modified by LogOM
OM 16: Features to highlight
Suitable for field use:
– IP 53 protected when opened
– IP 64 once the case is closed
Large screen to display:
– The measurement range
– The current waveform
– The ambient temperature
– The metal temperature coefficient
– 2 alarm thresholds
– The temperature compensated resistance value
Memory up to 1,000 samples to be recalled on the display, via Log OM software or printer
Protected up to 250 V
OM 21 / 22: Features to highlight
- High accuracy of 0.03 % RDG + 0.1 µOhm
- Manual or automatic measurement triggering with programmable sampling rate and 2 programmable thresholds
- Floating analog OUTPUT 0 / 2.5 V (Load beyond 2.5 Kohms, 10 mV resolution). An image can be made of all or part of the result values: The triggering and range of measurement can be programmed in order to get a « zoom » effect
- Memory up to 1,000 samples to be recalled on the display, via Log OM software or printer
AOIP Products are applying in:
Energy field, Aircraft industry, Motors & transformers, Railway, Car industry, Manufacturers of components, Domestic electrical appliances, Electric cables, Car industry, Motors & transformers
AOIP Products are applying in Manufacturers of components
– Manufacturers and users of electronic components: Switches, relays, connectors, resistors, fuses…
– Manufacturers and users of heat-sensitive devices: Thermistors, temperature-sensitive components…
Application: Quality control / End Of Production (EOP) line testing, such as
– Contact resistance must keep below stated limits
– Resistance tolerance must meet the quality requirements
Products to offer: OM 21 / 22
OM 21 / 22 features to highlight:
– IEEE programmable under Labview for automation
– Bench unit or optional rack mounting kit
– High accuracy of 0.03 % RDG
– Maximum measurement voltage limited to 20 or 50 mV
– Measurement and compensation of EMFs and ambient temperature
AOIP Products are applying in Domestic electrical appliances
Manufacturers of domestic electrical appliances: laundry iron, ventilators, hair dryer…
Maintenance companies appointed by manufacturers
Applications: Quality control / End Of Production (EOP) line testing, such as
– Quality control of wires / motors / contacts / fuses heat rise and resistance
– EC approval tests
– Contact resistance must keep below stated limits
– Resistance tolerance must meet the quality requirements
OM 21/ 22 features to highlight:
– IEEE programmable under Labview for automation
– Bench unit or optional rack mounting kit
– High accuracy of 0.03 % RDG
– Measurement and compensation of EMFs and ambient temperature
– Pulse current, very low power delivered
AOIP Products are applying in Aircraft industry
Manufacturers of airplanes / helicopters
Fitting / Engineering companies
Maintenance companies in airports / aircraft maintenance centers
Suppliers of metal / composite parts & modules for airplanes / helicopters
Application: Earth bonding / Metallisation
Detect and eliminate the difference of potential between metal and composite parts in order to avoid sparks
Principle: While in flight, an airplane may become highly charged with static electricity because of its relatively high electrical conductivity.
If the airplane is improperly bonded (metal parts not 100% electrically connected together), static charges are not evenly spread over each metal part, they could accumulate and increase the potential until it leads to an ignition.
OM 16 features to highlight:
– Compact and powerful and protected device to be used in harsh environment
– Waterproof instrument: IP 53 protected when opened / IP 64 once the case is closed
– Auto triggering when continuity
AOIP Products are applying in Motors & transformers
Manufacturers of electric motors & transformers
Users of electric motors and transformers
Maintenance companies appointed by users
Application: Control of heat rise and resistance
Measurement of winding first at ambient temperature, then at full load, to determine the internal motor / generator temperature rise (= Internal power loss) using the temperature coefficient of the copper winding, then again at set time intervals so as to draw a cooling curve from the maximum resistance
Product features to highlight:
– Total protection against overvoltages
– Automatic compensation of the sample temperature and thermal EMFs
– Automatic calculation of winding heating
– Choice of metal temperature coefficient
Examples:
ABB
Siemens Motors
WEG
Leroy Sommer Motors
Car motors:
Bosch / PSA / Honeywell
AOIP Products are applying in Cable manufacturers
Cable installation companies
Application:
Resistivity measurement of cables= Quality control of electric cables in terms of length / material quality
Principle:
A high cable resistance means a lower quality of current carrying (heating up of the cable when the maximum rated current is flowing), while a low cable resistance means the
manufacturer is being too generous on the cable diameter (much more expensive given the price of copper).
OM 21 features to highlight:
– High resolution: 0.1 µOhm
– Automatic compensation of the sample temperature and of thermal EMFs
– Display in Ohm / Km
AOIP Products are applying in Energy field
Electricity distribution substations
Application:
Bonding / Earthing in substations
Principle:
In substations, bonding and earthing connections must be regularly measured to ensure safet y, i.e. to achieve and maintain low resistance joint:
Copper earthing systems are found on every equipment in substations and must be regularlycontrolled, as well as the electrical connection between components that must remain at the
same potential.
Product features to highlight:
– Robust design suitable for field use
– Low sensitive to high magnetic fields found in substations
AOIP Products are applying in Railway
National and private railway companies.
Maintenance companies appointed by railway companies
Applications: Preventive maintenance
– Monitoring of tracks run through by micro current and high voltage in order to prevent oxidation that increase the tracks resistance
– Control of power distribution cables (used for transferring route information)
Railway companies may use different track systems and information systems, hence different uses of OM 16.
OM 16 features to highlight:
– Light handheld instrument protected against shocks and battery powered
– 1 mA to 10 A
AOIP Products are applying in Car industry:
Manufacturers of vehicles and components (subcontractors): Motors, alternators, connectors, cable harnesses, switches…
Maintenance companies appointed by the manufacturers
Applications:
– Control of earth wire
– Control of wires, contacts and connectors
– Control of motors heat rise and resistance: All types of motors, from diesel engine to seat controlling unit and motor for windscreen wiper
– Spot welding: Control of weld quality
Product features to highlight:
– Depending on the application, see other slides
Examples:
Renault
PSA
Faurecia Cooling systems
Valeo Electric devices
Honeywell
