Test Technology - Resistance Testing
To provide the greatest possible accuracy, ATI Test Systems utilizes a number of technical features when performing a resistance test. These features are not common in competitor’s equipment.
Following are some of these features:
Test current is kept to a minimum and applied for the shortest amount of time possible to avoid heating of the copper or aluminum magnet wire. Because magnet wire has a resistance temperature coefficient of approximately 0.4 %/°C, it is important to avoid heating the wire in order to produce stable, repeatable measurement values.
Connection to the lead wires or Cluster Block is made via a 4-wire Kelvin connection. Both test current and the resultant voltage drop are integrated over one line cycle and measured simultaneously. This integration over a power line cycle causes the voltage and current values to be extensively filtered at harmonics of the line frequency. Most electrical noise found in motor manufacturing facilities is at harmonics of the power line frequency. This is a feature not found in competitor’s products.
A sixteen-bit converter is used for the A to D measurement. Typical competitive Systems are twelve-bit.
Ambient temperature compensation is standard. Optional, non-contact, infrared, part temperature measurement is available. This temperature compensation feature normalizes the resistance measurements back to programmable standard laboratory conditions typically 25°C.
The combination of the above features and test methods provide the best Gage R&R of any Test Systems available (particularly at the very low resistance ranges below 0.100 Ohms).
Click on the links below to learn more about the test technologies we provide.
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