Kipp&Zonen COMBILOG Data Logger - Manual (Page 42)

Resistance Measurement
Figure 5.5 Resistance measurement in 2-wire technique
Figure 5.6 Resistance measurement in 3-wire technique
Figure 5.7 Resistance measurement in 4-wire technique
Hardware Manual COMBILOG 1022 42
Source
IN+
IN-
AGND
U
Rx = U/U0 * R0,
Anschlussschema Schaltung
Rx
Rx
Messwiderstand
RL
RL R0
=
U0
Rx = 2 * RL
Connection scheme Circuit
Source
IN+
IN-
AGND
U1
Rx = (U1/U0-2*U2/U0) * R0,
Anschlussschema Schaltung
Rx
Rx
Messwiderstand
RL
RL R0
=
U0
U2
Rx = 0
Connection scheme Circuit
Source
IN+
IN-
AGND
U2 - U3
Rx = (U2 - U3)/U0 * R0,
Anschlussschema Schaltung
Rx
Rx
Messwiderstand
RL
RL R0
=
U0
Rx = 0
Connection scheme Circuit