Hardware Manual COMBILOG 1020
47
Resistance Measurement
measuring resistance
Rx
In +
AGND
R0
Rx
RL
RL
U
+
-
U1
∆
Rx = U1/U0 * R0, Rx = 2*RL
A I N 2
A I N 1
S
O
U
R
C
E
In
+
In
-
A
G
N
D
S
O
U
R
C
E
In
+
In
-
A
G
N
D
S
O
U
R
C
E
connection scheme
circuit
Figure 5.5 Resistance measurement in 2-wire technique
Connection scheme
Circuit
Rx
In
-
SO
UR
CE
In
+
In
+
AG
ND
SO
UR
CE
In
-
AIN 1
AIN 2
AG
ND
U
AGND
RL
U2
-
Source
Rx
In+
RL
U1
+
R0
measuring resistance
Rx = (U1/U0-2*U2/U0) * R0,
∆
Rx=0
Figure 5.6 Resistance measurement in 3-wire technique
measuring resistance
Rx
Source
AGND
R0
Rx
RL
RL
U
+
-
In +
In -
U2-U3
∆
Rx = (U2-U3)/U0 * R0, Rx = 0
A I N 2
A I N 1
S
O
U
R
C
E
In
+
In
-
A
G
N
D
S
O
U
R
C
E
In
+
In
-
A
G
N
D
S
O
U
R
C
E
connection scheme
circuit
Figure 5.7 Resistance measurement in 4-wire technique
SOURCE
Connection scheme
Circuit
Connection scheme
Circuit
Rx = (U2-U3)/U0 * R0,
∆
Rx = 0
Rx = U1/U0 * R0,
∆
Rx = 2*RL
Summary of Contents for COMBILOG 1020
Page 1: ...COMBILOG 1020 Datalogger Hardware Manual Version 3 09...
Page 2: ...Hardware Manual COMBILOG 1020 2 Issue 03 11 2005 Technical data are subject to change...
Page 4: ...Hardware Manual COMBILOG 1020 4...
Page 6: ...Hardware Manual COMBILOG 1020 6...
Page 12: ...Hardware Manual COMBILOG 1020 12...
Page 86: ...Hardware Manual COMBILOG 1020 86 Bild 8 1 Example Master Slave System...
Page 169: ...Hardware Manual COMBILOG 1020 169...
Page 170: ...Hardware Manual COMBILOG 1020 170...