Kelvin Four Terminal Resistors

TOKEN
LSQ Open Air Current Sense Resistors
Kelvin Four Terminal
Resistors
Token (LSQ) Family Four Terminal Resistors
handle high-wattage applications
Preview
Providing ultralow resistance values (to 0.01 ohm) for
relatively high current requirements, new four-terminal
cement filling resistors from Token combine the
advantages of a Kelvin configuration with PC board
mounting capability.
The Kelvin (or four-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 four terminal resistors are a new version of Token’s (LSQ) Current Sense Family Series which was specially
designed for use in a Kelvin configuration where a current is applied through two opposing leads and sensing
voltage is measured across the other two leads. Token LSQ series is specifically designed for low resistance
applications requiring the highest accuracy and temperature stability.
The advantages of Kelvin configuration 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 resistors.
Token will also produce low ohm resistor LSQ series outside these specifications to meet customer requirements.
Contact us with your specific needs.
Features
Applications
- Welded & fireproof construction.
- Superior anti-surge capability & Low TCR.
- Thermal conductivity and moisture resistance.
- Special inorganic potting construction provides
high moisture resistance and thermal conductivity.
- 4 leads for Kelvin connection
with extremely low resistance values.
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- Automatic Test Equipment.
- Current Sensing Application.
- High Precision Instrumentation.
- Industrial, Medical and Military.
- Measurement Instrumentation.
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TOKEN
LSQ Open Air Current Sense Resistors
(LSQ-A) Specification & Dimensions (Unit: mm)
LSQ-A
L
W
H
P
Type
Power
(Watts)
Resistance
Range (Ω)
LSQ-A-3
LSQ-A-5
LSQ-A-7
LSQ-A-10
LSQ-A-15
3
5
7
10
15
R01~R1
R01~R1
R01~R1
R01~R1
R01~R1
L
22±1.0
22±1.5
35±2.0
48±2.0
48±2.0
d
Dimensions (Unit: mm)
W±1
H±1
8
8
9.5
9.5
9.5
9.5
9.5
9.5
12.5
12.5
P±1
14
14
25
36
36
d±0.5
0.8
0.8
0.8
0.8
0.8
(LSQ-B) Specification & Dimensions (Unit: mm)
LSQ-B
L
W
H
Φd
P1
P
Type
Power
(Watts)
Resistance
Range (Ω)
LSQ-B-5
5
R01~R1
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L±2
26
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W±1
5
Dimensions (Unit: mm)
H±1
P±1
10
20
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P1±1
12
d±0.5
0.8
Version 2010
TOKEN
LSQ Open Air Current Sense Resistors
(LSQ-C) Specification & Dimensions (Unit: mm)
LSQ-C
W
L
H
Φd
P1
P
Type
Power
(Watts)
LSQ-C-10
10
Resistance Dimensions (Unit: mm)
Range (Ω) L±2
W±1
H±1
R01~R1
18
10.5
20
P±1
12
P1±1
5
d±0.5
1.0
Power Derating Curve
Power Derating Curve
R at ed L oa d ( %)
120
100
80
60
40
20
0
-55
-25
25 40
75
125
175
225
275
Ambient Temperature (℃)
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TOKEN
LSQ Open Air Current Sense Resistors
Characteristic Specification
KELVIN ELECTRICAL CONNECTION
R
1
4
3
2
TERMINALS 2 & 3 CURRENT TRACES.
TERMINALS 1 & 4 SENSE TRACES.
Test Items
Resistance Tolerances
Temperature Coefficients
Test Method
Operating Temperature Range
Maximum Working Voltage
Terminal Tensile Strength
Withstand Voltage
Short Time Overload
Thermal Shock
50N, 10s
1000V, 1 Min.
5 times rated power, 5s
-55°C~+275°C, 5 cycles, 30 min.
Specification
D(±0.5%), F(±1%), G(±2%), J(±5%)
±10 ppm/°C, ±20 ppm/°C, ±25 ppm/°C,
±50 ppm/°C,
-55°C~275°C
(P40°C x R)1/2
ΔR≤±1.0%R
No damage on the appearance.
ΔR≤±4.0%R
ΔR≤±5.0%R
How to Order
LSQ-A
15
R01
J
P





 Part Number: LSQ-A, LSQ-B, LSQ-C
 Rated power
Code
3
5
7
10
15
 Tolerance %
Rated power
3 Watt
5 Watt
7 Watt
10 Watt
15 Watt
Code
Tolerance %
J
±5%
 Package-Code
Code
Package-Code
P
Bulk
 Resistance Value (Ω)
Code
R01
R05
R1
Resistance Value (Ω)
0.01Ω
0.05Ω
0.1Ω
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