Seaward DO7010 - Manual (Page 17)

1-4 MEASUREMENT METHOD:
In order to perform high accuracy low resistance measurements, the DO7010 uses a 4
wire method named Kelvin method.
- 2 wires are used to connect a constant current source to the specimen under
test
- 2 wires are used to measure the voltage difference directly on the specimen
under test terminals.
With this method the measurement leads resistance doesn’t introduce error, but should
not exceed 170 m
Ω for the current connection.
Kelvin method
-I
R lead
R lead
R lead
Rx Ic
+I
+U
-U
R lead
Ux
Rx = Ux / Ic
DO7010 Accessories
Resistance to
be measured
Operating Instructions Digital Microhmmeter Type DO7010
15