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4-Terminal Current Sensing Resistor (LSQ)
Direct's Kelvin style (LSQ) family current sensing 4-terminal resistors handle high-wattage applications.
Providing ultralow resistance values (to 0.01 ohm) for relatively high current requirements, new four-terminal cement filling resistor from Direct combine the advantages of a Kelvin configuration with PC board mounting capability.
The Kelvin (or 4-terminal) configuration enables current to be applied through two opposite terminals and a sensing voltage to be measured across the other two terminals, eliminating the resistance and temperature coefficient of the terminals for a more accurate current measurement.
The 4 lead resistors are a new version of Direct's (LSQ) Precision Current Sensing Family Resistors which was specially designed for use in a Kelvin method where a current is applied through two opposing leads and sensing voltage is measured across the other two leads. Direct LSQ series is specifically designed for low resistance applications requiring the highest accuracy and temperature stability.
The advantages of Kelvin connection enable the resistance and temperature coefficient of the leads to be effectively eliminated. The need to connect to the leads at precise test points is eliminated, allowing for tighter tolerance on the end application. Also results in a lower temperature coefficient of resistance and lower self-heating drift which may be experienced on two-terminal resistor.
Direct will also produce low ohmic resistor LSQ series outside these specifications to meet customer requirements.
Contact us with your specific needs. Download PDF Specification Current Sensing Four Terminal Resistors (LSQ).
- Welded & fireproof construction.
- Superior anti-surge capability & Low TCR.
- Special inorganic potting construction provides
high moisture resistance and thermal conductivity.
- 4 leads for Kelvin connection with extremely low resistance values.
- Automatic Test Equipment.
- Current Sensing Application.
- High Precision Instrumentation.
- Industrial, Medical and Military.
- Measurement Instrumentation.
Characteristic Specification (LSQ)
Kelvin 4 Lead configuration (LSQ)
||D(±0.5%), F(±1%), G(±2%), J(±5%)
||±10 ppm/°C, ±20 ppm/°C, ±25 ppm/°C, ±50 ppm/°C
|Operating Temperature Range
|Maximum Working Voltage
||(P40°C x R)1/2
|Terminal Tensile Strength
||1000V, 1 Min.
||No damage on the appearance.
|Short Time Overload
||5 times rated power, 5s
||-55°C~+275°C, 5 cycles, 30 min.
||40°C, 1000h 1.5 hours on, 0.5 hours off.