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Ohmite's Four Terminal
Bare Element Resistors provide ultra low resistance values (to 0.0005‡) for
relatively high current requirements, with the advantages of a Kelvin
configuration and PC Board mounting capability.
These resistors are
specifically designed for low resistance applications requiring the
highest accuracy and temperature stability. This Four Terminal version of
Ohmite's 60 Series Resistor is specially designed for use in a Kelvin
configuration, in which a current is applied through two opposite leads
and sensing voltage is measured across the other two leads.
The Kelvin configuration
enables the resistance and temperature coefficient of the leads to be
effectively eliminated. The four terminal design also results in a lower
Temperature Coefficient of Resistance and lower self heating drift which
may be experienced on two terminal resistors. The requirement to connect
to the leads at precise test points is eliminated, allowing for tighter
tolerancing on the end application.
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FEATURES
- Ideal for current sensing applications
- 1% tolerance standard, others available
- Low inductance (non-inductive below 0.05
ohms)
- RoHS compliant
- Radial, self-supporting, design is ideal
for PC board mounting
- High Power-to-size ratio
- Decimal marked, silicone coated (650 Series
only)
SPECIFICATIONS
Material
- Terminals: Tinned Copper
- Resistive element: Manganin Alloy
Electrical
- Operating Temperature Range: -55°C to +275°C.
- Temperature Coefficient of Resistance, 0°C
to 85°C: ±50
PPM/°C, .015 ohms and higher ±100 PPM/°C, .015 ohms and lower
- Environmental Performance: Exceeds the requirements of MIL-PRF-49465
- Power rating: Based on 25°C free air rating
- Overload: 5 times rated wattage for 5 seconds
- Thermal EMF: Less than ±3µV/°C
- Derating: Linearly from 100% @ +25°C to 0% @ 275°C
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